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Journal articles on the topic 'Range and Position Finding Target Direction'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 July 2025

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1

Tanaka, Masaki, and Stephen G. Lisberger. "Role of Arcuate Frontal Cortex of Monkeys in Smooth Pursuit Eye Movements. I. Basic Response Properties to Retinal Image Motion and Position." Journal of Neurophysiology 87, no. 6 (2002): 2684–99. http://dx.doi.org/10.1152/jn.2002.87.6.2684.

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Anatomical and physiological studies have shown that the “frontal pursuit area” (FPA) in the arcuate cortex of monkeys is involved in the control of smooth pursuit eye movements. To further analyze the signals carried by the FPA, we examined the activity of pursuit-related neurons recorded from a discrete region near the arcuate spur during a variety of oculomotor tasks. Pursuit neurons showed direction tuning with a wide range of preferred directions and a mean full width at half-maximum of 129°. Analysis of latency using the “receiver operating characteristic” to compare responses to target

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Logvinov, Yu, Yu Pedenko, and N. Reznichenko. "ON THE ACHIEVABLE UPPER LIMIT OF THE ELEVATION ANGLES OF EFFECTIVE DIRECTION FINDING OF TARGETS OVER THE SEA BY THE ROOT-MUSIC METHOD PROVIDED WITH ADEQUATE A PRIORI PARAMETERS." Radio physics and radio astronomy 29, no. 4 (2024): 281–92. https://doi.org/10.15407/rpra29.04.281.

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Subject and Purpose. The paper investigates the accuracy of measurements of the elevation angles of targets located near the sur- face of a disturbed sea in the area from the upper limit of their extremely small values to the free space zone. The main part of the study concerns measurements using the root-MUSIC method based on the analysis of the eigenvalues of the autocorrelation matrix of signals received from the target. Under the same conditions, the accuracy of measurements using the amplitude sum-difference (monopulse) method was obtained. The purpose of the work was to determine the upp

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Misslisch, H., D. Tweed, and T. Vilis. "Neural Constraints on Eye Motion in Human Eye-Head Saccades." Journal of Neurophysiology 79, no. 2 (1998): 859–69. http://dx.doi.org/10.1152/jn.1998.79.2.859.

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Misslisch, H., D. Tweed, and T. Vilis. Neural constraints on eye motion in human eye-head saccades. J. Neurophysiol. 79: 859–869, 1998. We examined two ways in which the neural control system for eye-head saccades constrains the motion of the eye in the head. The first constraint involves Listing's law, which holds ocular torsion at zero during head-fixed saccades. During eye-head saccades, does this law govern the eye's motion in space or in the head? Our subjects, instructed to saccade between space-fixed targets with the head held still in different positions, systematically violated Listin

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Sainburg, R. L., C. Ghez, and D. Kalakanis. "Intersegmental Dynamics Are Controlled by Sequential Anticipatory, Error Correction, and Postural Mechanisms." Journal of Neurophysiology 81, no. 3 (1999): 1045–56. http://dx.doi.org/10.1152/jn.1999.81.3.1045.

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Intersegmental dynamics are controlled by sequential anticipatory, error correction, and positional control mechanisms. The purpose of this study is to examine the mechanisms underlying control of intersegmental dynamics during reaching movements. Two experiments were conducted to determine the relative contributions of anticipatory and somatosensory feedback mechanisms in controlling intersegmental dynamics and whether adaptation to novel intersegmental dynamics generalizes across a range of movement directions. The mechanisms used to control interaction torques were examined by altering the

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Sparrow, W. A., Alison J. Shinkfield, and Nadine Lambe. "Intelligence and Motor Skill Acquisition by Discrimination Learning." Perceptual and Motor Skills 77, no. 2 (1993): 651–58. http://dx.doi.org/10.2466/pms.1993.77.2.651.

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This experiment investigated the relation between intelligence and acquisition of motor skill using predictions from Zeaman and House's 1963 attention theory. 20 undergraduate students and 20 subjects of low IQ (WAIS—R Full Scale IQ range 50 to 73, M = 60) made linear positioning movements of long and short amplitude to the left and right of a central starting position. Four conditions (right-long, right-short, left-long, left-short) were created by specifying the corresponding target area on the positioning apparatus. One or both of the paired cues were varied, i.e., left, right, long, or sho

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AL-Forati, Israa, and Abdulmuttalib Rashid. "Robotics Path Planning Algorithms using Low-Cost IR Sensor." 3D SCEEER Conference sceeer, no. 3d (2020): 44–52. http://dx.doi.org/10.37917/ijeee.sceeer.3rd.7.

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A robot is a smart machine that can help people in their daily lives and keep everyone safe. the three general sequences to accomplish any robot task is mapping the environment, the localization, and the navigation (path planning with obstacle avoidance). Since the goal of the robot is to reach its target without colliding, the most important and challenging task of the mobile robot is the navigation. In this paper, the robot navigation problem is solved by proposed two algorithms using low-cost IR receiver sensors arranged as an array, and a robot has been equipped with one IR transmitter. Fi

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de Haan, Edward H. F., Nils S. van den Berg, Nikki A. Lammers, Selma Lugtmeijer, Anouk R. Smits, and Yaïr Pinto. "14 Prevalence of Mid-Range Visual Functions and their Relationship to Higher-order Visual Functions after Stroke." Journal of the International Neuropsychological Society 29, s1 (2023): 697–98. http://dx.doi.org/10.1017/s135561772300872x.

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Objective:Visual deficits are common after stroke and are powerful predictors for the chronic functional outcome. However, while basic visual field and recognition deficits are relatively easy to assess with standardized methods, selective deficits in visual primitives, such as shape or motion, are harder to identify, as they often require a symmetrical bilateral posterior lesion in order to provoke full field deficits. We aimed to investigate the prevalence and co-occurrence of hemifield “mid-range” visual deficits. In addition, we looked at the repercussions of these mid-range deficits on hi

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Roy, Jefferson E., and Kathleen E. Cullen. "Vestibuloocular Reflex Signal Modulation During Voluntary and Passive Head Movements." Journal of Neurophysiology 87, no. 5 (2002): 2337–57. http://dx.doi.org/10.1152/jn.2002.87.5.2337.

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The vestibuloocular reflex (VOR) effectively stabilizes the visual world on the retina over the wide range of head movements generated during daily activities by producing an eye movement of equal and opposite amplitude to the motion of the head. Although an intact VOR is essential for stabilizing gaze during walking and running, it can be counterproductive during certain voluntary behaviors. For example, primates use rapid coordinated movements of the eyes and head (gaze shifts) to redirect the visual axis from one target of interest to another. During these self-generated head movements, a f

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He, Wentao, Xin Chen, Shunxiang Xing, and Tianxing Cai. "Dual-station direction finding location based on disturbance detection." ITM Web of Conferences 47 (2022): 02025. http://dx.doi.org/10.1051/itmconf/20224702025.

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The application of direction finding location technology in electronic warfare is becoming more and more extensive. Aiming at the problem that the traditional location method will greatly affect the location accuracy when the measurement information of each observation station is disturbed, a dual-station direction finding location algorithm based on disturbance detection is proposed. The algorithm uses the least squares method to obtain the target’s position information at each moment, then designs an improved Kalman filter algorithm with disturbance detection to improve the location accuracy

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Chen, Wei, Ruisheng Sun, and Weisheng Yan. "Optimal Position and Velocity Estimation for Multi-USV Positioning Systems with Range Measurements." Complexity 2018 (July 10, 2018): 1–12. http://dx.doi.org/10.1155/2018/5452723.

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This paper investigates the problem on simultaneously estimating the velocity and position of the target for range-based multi-USV positioning systems. According to the range measurement and kinematics model of the target, we formulate this problem in a mixed linear/nonlinear discrete-time system. In this system, the input and state represent the velocity and position of the target, respectively. We divide the system into two components and propose a three-step minimum variance unbiased simultaneous input and state estimation (SISE) algorithm. First, we estimate the velocity in the local level

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Chen, Bin, Zhenghao Jing, Yinke Dou, Yan Chen, and Liwei Kou. "Target Approaching Control Under a GPS-Denied Environment with Range-Only Measurements." Sensors 25, no. 14 (2025): 4497. https://doi.org/10.3390/s25144497.

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In this paper, we investigate the target-approaching control problem for a discrete-time first-order vehicle system where the target area is modeled as a static circular region. In the absence of absolute bearing or position information, we propose a simple local controller that relies solely on range measurements to the target obtained at two consecutive sampling instants. Specifically, if the measured distance decreases between two successive samples, the vehicle maintains a constant velocity; otherwise, it rotates its velocity vector by an angle of π/2 in the clockwise direction. This contr

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Codău, Cristian, Rareș-Călin Buta, Andra Păstrăv, Paul Dolea, Tudor Palade, and Emanuel Puschita. "Experimental Evaluation of an SDR-Based UAV Localization System." Sensors 24, no. 9 (2024): 2789. http://dx.doi.org/10.3390/s24092789.

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UAV communications have seen a rapid rise in the last few years. The drone class of UAV has particularly become more widespread around the world, and illicit behavior using drones has become a problem. Therefore, localization, tracking, and even taking control of drones have also gained interest. Knowing the frequency of a target signal, its position can be determined (as the angle of arrival with respect to a fixed receiver point) using radio frequency-based localization techniques. One such technique is represented by the subspace-based algorithms that offer highly accurate results. This pap

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Wang, Qi, Yusong Liu, Yue Qin, Hao Guo, and Jun Tang. "Microwave Passive Direction-Finding Method Based on NV Color Center in Diamond." Micromachines 14, no. 4 (2023): 774. http://dx.doi.org/10.3390/mi14040774.

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In this study, we established a passive direction-finding scheme based on microwave power measurement: Microwave intensity was detected using microwave-frequency proportion integration differentiation control and coherent population oscillation effect converting the change in microwave resonance peak intensity into a shift of the microwave frequency spectrum, for which the minimum microwave intensity resolution was −20 dBm. The direction angle of the microwave source was calculated using the weighted global least squares method of microwave field distribution. This lay in the 12~26 dBm microwa

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14

Hu, Chuanxing, Bo Zhang, Xishan Yang, Zhaokai Zhai, and Dai Liu. "Cyclic Peak Extraction from a Spatial Likelihood Map for Multi-Array Multi-Target Bearing-Only Localization." Journal of Marine Science and Engineering 13, no. 1 (2025): 109. https://doi.org/10.3390/jmse13010109.

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In the context of multi-array multi-target bearing-only localization, due to the existence of direction-finding errors, the crossing results of bearing lines cannot accurately determine correspondence with targets. Under conditions that clutter interference and missing of detection in direction-finding, the traditional method will produce false alarm targets and miss some targets. To address this issue, this paper draws on the idea of a spatial likelihood map which calculates the likelihood of target presence at each grid point within the observation area by partitioning the observation area i

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15

Guglielmi, A., J. Kangas, D. Milling, D. Orr, and O. Pokhotelov. "Range finding of Alfvén oscillations and direction finding of ion-cyclotron waves by using the ground-based ULF finder." Annales Geophysicae 15, no. 4 (1997): 424–29. http://dx.doi.org/10.1007/s00585-997-0424-4.

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Abstract. A new approach to the problem of direction and distance finding of magnetospheric ULF oscillations is described. It is based on additional information about the structure of geoelectromagnetic field at the Earth's surface which is contained in the known relations of the theory of magnetovariation and magnetotelluric sounding. This allows us to widen the range of diagnostic tools by using observations of Alfvén oscillations in the Pc 3–5 frequency band and the ion-cyclotron waves in the Pc 1 frequency band. Preliminary results of the remote sensing of the magnetosphere at low-latitude

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Qu, Xiao, and Wei Gang Zheng. "Design of Ship Anti-Collision Alarm System Based on Laser Range-Finding." Applied Mechanics and Materials 496-500 (January 2014): 1502–5. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.1502.

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This paper introduces the design of a laser rangefinder ship collision avoidance warning system , laser distance sensor and two degrees of freedom PTZ constituted the system. the horizontal and vertical direction to achieve dynamic scanning . Real-time monitoring of the target vessel and the surrounding vessels ( obstructions ) distance , When entering the test vessel and the surrounding areas of the ship reaches the set distance of the minimum distance , alarm system achieve sound and light alarm for ship driver promptly adjusting the route for more time. Therefore reducing ship collisions ha

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17

Li, Lin, Yanxia Li, Chang-hong Wu, and Hao Fu. "Upper Limb Proprioceptive Acuity Assessment Based on Three-Dimensional Position Measurement Systems." Motor Control 24, no. 4 (2020): 605–23. http://dx.doi.org/10.1123/mc.2020-0009.

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The aim of the current work was to verify three-dimensional directional effects on the reproduction error precision of the human upper limb position. Thirty male subjects without history of upper limb pathology were recruited from Renmin University of China. A three-dimensional position reproduction task in six directions (up, down, left, right, far, and near) was performed by each subject. The results suggested that the proprioceptive sense of upper limb position depends on the direction, with smaller absolute errors in Directions 4 (right) and 5 (far) than in Directions 1 (up), 2 (down), 3 (

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18

Xu, Hang, Hong Ma, Li Wang, Jiang Jin, Hua Zhang, and Xiaodong Liu. "Spatial Spectrum Estimation of Weak Scattering Wave Signal in Range-Doppler Domain." Remote Sensing 16, no. 12 (2024): 2186. http://dx.doi.org/10.3390/rs16122186.

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How to enhance the desired signal with low signal-to-noise ratio (SNR) is a difficult problem in the estimation process of the direction-of-arrival (DOA) of the target scattering wave signal. In this paper, the feasibility of spatial spectrum estimation in the Range-Doppler (RD) domain is analyzed in principle, and the SNR gain expression of weak scattering wave signal is derived when constructing multi-snapshots virtual array data. On this basis, the mutual eigenvector singular value decomposition (MESVD) method based on RD domain mode excitation is proposed, which can robustly and effectivel

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Tserne, Eduard, Semen Zhyla, Anatoliy Popov, et al. "On-board radar complex for high-precision direction finding of radio sources for autonomous guidance of winged UAVs." Radioelectronic and Computer Systems 2024, no. 3 (2024): 108–31. http://dx.doi.org/10.32620/reks.2024.3.08.

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The subject of this article is the design of a cheap, simple, and highly accurate on-board radar system for determining the angular position of radio-signal emission stations, which can be used to guide UAVs to a specified area of space. The aim of this study is to develop high-precision functioning algorithms, practical recommendations for implementation, and experimental measurements of the main parameters of the onboard radio direction finders of radio radiation sources placed on winged UAVs. Objectives of the research: 1) analysis of the statistical theory of optimization of signal process

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20

Décréau, P. M. E., C. Ducoin, G. Le Rouzic, et al. "Observation of continuum radiations from the Cluster fleet: first results from direction finding." Annales Geophysicae 22, no. 7 (2004): 2607–24. http://dx.doi.org/10.5194/angeo-22-2607-2004.

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Abstract. The Cluster fleet offers the first possibility of comparing non-thermal terrestrial continuum radiation from similarly equipped nearby observation points. A very rich data set has already been acquired on the Cluster polar orbit, between 4 and 19 Earth radii geocentric distances, and preliminary analysis has been carried out on these emissions. We focus in this paper on direction finding performed from all four spacecraft as a means to locate the position of the sources of this continuum radiation. Directions are derived from spin modulation properties, under the usual analysis assum

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Adalaeva, P. Sh, T. G. Aigumov, S. V. Magomedova, and T. A. Chelushkina. "IDENTIFICATION OF AIR RADAR TARGETS USING THE DOPPLER EFFECT FROM A HEATED JET ENGINE." Herald of Dagestan State Technical University. Technical Sciences 45, no. 2 (2018): 31–41. http://dx.doi.org/10.21822/2073-6185-2018-45-2-31-41.

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ObjectivesThe aim of the study is to develop a methodology for identifyingaircraft by the deflections of an electromagnetic radar beam by a heated jet engine. MethodsAtoms of the crystal lattice of the metallic parts of the operating jet engine will be in a state of chaotic Brownian motion due to heating. The electromagnetic beam, falling on these atoms, will change its frequency in accordance with the Doppler effect, by means of which the spectral electromagnetic radiation component will expand in direct proportion to the magnitude of the engine temperature. When determining the width of the

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Qiu, Kaiyue, Ruizhi Chen, Guangyi Guo, Yuan Wu, and Wei Li. "Robust Bluetooth AoA Estimation for Indoor Localization Using Particle Filter Fusion." Applied Sciences 14, no. 14 (2024): 6208. http://dx.doi.org/10.3390/app14146208.

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With the growing demand for positioning services, angle-of-arrival (AoA) estimation or direction-finding (DF) has been widely investigated for applications in fifth-generation (5G) technologies. Many existing AoA estimation algorithms only require the measurement of the direction of the incident wave at the transmitter to obtain correct results. However, for most cellular systems, such as Bluetooth indoor positioning systems, due to multipath and non-line-of-sight (NLOS) propagation, indoor positioning accuracy is severely affected. In this paper, a comprehensive algorithm that combines radio

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23

Engel, Kevin C., and John F. Soechting. "Manual Tracking in Two Dimensions." Journal of Neurophysiology 83, no. 6 (2000): 3483–96. http://dx.doi.org/10.1152/jn.2000.83.6.3483.

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Manual tracking was studied by asking subjects to follow, with their finger, a target moving on a touch-sensitive video monitor. The target initially moved in a straight line at a constant speed and then, at a random point in time, made one abrupt change in direction. The results were approximated with a simple model according to which, after a reaction time, the hand moved in a straight line to intercept the target. Both the direction of hand motion and its peak speed could be predicted by assuming a constant time to intercept. This simple model was able to account for results obtained over a

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Fu, Q. G., D. Flament, J. D. Coltz, and T. J. Ebner. "Relationship of Cerebellar Purkinje Cell Simple Spike Discharge to Movement Kinematics in the Monkey." Journal of Neurophysiology 78, no. 1 (1997): 478–91. http://dx.doi.org/10.1152/jn.1997.78.1.478.

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Fu, Q.-G., D. Flament, J. D. Coltz, and T. J. Ebner. Relationship of cerebellar Purkinje cell simple spike discharge to movement kinematics in the monkey. J. Neurophysiol. 78: 478–491, 1997. The simple spike discharge of 231 cerebellar Purkinje cells in ipsilateral lobules V and VI was recorded in three monkeys trained to perform a visually guided reaching task requiring movements of different directions and distances. The discharge of 179 cells was significantly modulated during movement to one or more targets. Mean simple spike rate was fitted to a cosine function for direction tuning, a sim

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Deng, Zhen Rong, Wen Ming Huang, Dong Yu, and Yin Wei Li. "An Improved Method of Tracking the Motion of Sperm Target." Applied Mechanics and Materials 241-244 (December 2012): 2940–43. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.2940.

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This paper analyzes the multi-target tracking of sperm by using the improved nearest neighbor data association tracking method which predicts the position where the sperm may appear in the next frame by computing the interframe-distance and direction of the sperm. Also, in order to dealing with the situation of tracking lose and many-to-one tracking, we proposed two processing methods for sperm re-tracking of tracking lost compensation and tracking forecast minimum-range. The experiment shows this algorithm has better tracking accuracy and higher efficiency.

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Tu, Da Wei, Xu Zhang, Kai Fei, and Xi Zhang. "Laser Stereo Vision-Based Position and Attitude Detection of Non-Cooperative Target for Space Application." Advanced Materials Research 1039 (October 2014): 242–50. http://dx.doi.org/10.4028/www.scientific.net/amr.1039.242.

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Vision measurement for non-cooperative targets in space is an essential technique in space counterwork, fragment disposal, satellite on-orbit service, spacecraft rendezvous, because the position and attitude of the target aircraft or the object should be detected first of all in the process. The 2D passive camera loses the depth information and can not measure the position and attitude of non-cooperative target. Several kinds of range imaging methods are alternatives. The traditional triangulation method can provide very high precision range measurement at close range but the nature of the tri

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Konopel'kin, Maxim Yu, Sergey V. Petrov, and Daria A. Smirnyagina. "Radar Information Processing Algorithms in a Specialized Computer-Aided Design System." Radioelectronics. Nanosystems. Information Technologies. 14, no. 2 (2022): 119–26. http://dx.doi.org/10.17725/rensit.2022.14.119.

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A brief description of the radar CAD software modules responsible for this functionality is given. The module of engineering calculations and simulations allows you to set the scenario of the interference-target situation and conduct a complete, close to reality, simulation of the behavior of the radar in combat conditions. The visual functional editor provides the ability to create a radar simulation model in the form of a graph of streaming calculations from interconnected parameterizable blocks. The library of parameterizable modeling blocks contains modeling blocks designed for calculation

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Lestari, Dyah, Siti Sendari, and Ilham Ari Elbaith Zaeni. "Genetic algorithm for finding shortest path of mobile robot in various static environments." JURNAL INFOTEL 15, no. 3 (2023): 281–87. http://dx.doi.org/10.20895/infotel.v15i3.961.

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In conducting their work in the industry quickly, precisely, and safely, mobile robots must be able to determine the position and direction of movement in their work environment. Several algorithms have been developed to solve maze rooms, however, when the room is huge with several obstacles which could be re-placed in other parts of the room, determining the path for a mobile robot will be difficult. This can be done by mapping the work environment and determining the position of the robot so that the robot has good path planning to get the optimal path. In this research, a Genetic Algorithm

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Wang, Cheng, Zhi Zheng, and Wen-Qin Wang. "FDA-MIMO Radar Rapid Target Localization via Reconstructed Reduce Dimension Rooting." Sensors 25, no. 2 (2025): 513. https://doi.org/10.3390/s25020513.

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Frequency diversity array–multiple-input multiple-output (FDA-MIMO) radar realizes an angle- and range-dependent system model by adopting a slight frequency offset between adjacent transmitter sensors, thereby enabling potential target localization. This paper presents FDA-MIMO radar-based rapid target localization via the reduction dimension root reconstructed multiple signal classification (RDRR-MUSIC) algorithm. Firstly, we reconstruct the two-dimensional (2D)-MUSIC spatial spectrum function using the reconstructed steering vector, which involves no coupling of direction of arrival (DOA) an

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Wang, Qi Long, Jian Yong Li, Hai Kuo Shen, Teng Teng Song, and Yan Xuan Ma. "Research of Multi-Sensor Data Fusion Based on Binocular Vision Sensor and Laser Range Sensor." Key Engineering Materials 693 (May 2016): 1397–404. http://dx.doi.org/10.4028/www.scientific.net/kem.693.1397.

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The system of binocular vision sensor was used in the air-to-air close air target positioning in the paper. Due to the limitation of model itself, the measurement accuracy along the direction of optical axis is far lower than the accuracy of vertical direction. In order to improve the measurement accuracy of the optical axis, the paper put forward to using laser range sensor to cooperate with binocular vision sensor; Then the paper proposed adopts adaptive weighted fusion algorithm of multi-sensor information fusion to improve the utilization efficiency of multi-sensor information and to make

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Zhang, Yingjie, Jianbin Li, and Jun Xing. "A study on position variation of liver cancer and interested structures during respiration by 4DCT and 3DCT." Journal of Clinical Oncology 30, no. 15_suppl (2012): e13529-e13529. http://dx.doi.org/10.1200/jco.2012.30.15_suppl.e13529.

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e13529 Background: The movement of liver cancer targets could be infected by respiration.The aim of this study was to investigate the position difference of liver cancer in free-breathing condition between 3DCT and 4DCT simulation, and to investigate the correlation of position movement of primary tumor with normal tissues and skin markers. Methods: 12 patients with liver cancer after TACE were scanned at free breath condition by simulation 4DCT and 3DCT. A coordinate system was created based on image of T20 (maximum intensity projection) reconstructed from 4DCT, gross tumor volume (GTV), norm

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Vindras, Philippe, Michel Desmurget, and Paolo Viviani. "Error Parsing in Visuomotor Pointing Reveals Independent Processing of Amplitude and Direction." Journal of Neurophysiology 94, no. 2 (2005): 1212–24. http://dx.doi.org/10.1152/jn.01295.2004.

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An experiment investigated systematic pointing errors in horizontal movements performed without visual feedback toward 48 targets placed symmetrically around two initial hand positions. Our main goal was to provide evidence in favor of the hypothesis that amplitude and direction of the movements are planned independently on the basis of the hand-target vector (vectorial parametric hypothesis, VP). The analysis was carried out mainly at the individual level. By screening a number of formal models of the potential error components, we found that only models compatible with the VP hypothesis prov

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Wang, Bo, Yong Jian Li, Zhe Ming Song, Jin Gen Sheng, and Huan Cao. "The Effects of Object Independent Vibration on Visual Identification Efficiency." Applied Mechanics and Materials 110-116 (October 2011): 4263–68. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.4263.

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Choosing reaction time as dependent variable, the paper discussed the effects of object independent vibration on visual identification efficiency, which was under different vibration frequency, amplitude, direction and the position of target gap. The major experiment results indicated that the reaction time increase exponentially with the increasing of vibration frequency and amplitude within a certain range. This will provide a scientific basis for design optimization and vibration control of human-machine system.

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Herlambang, Teguh, and Subchan Subchan. "MISSILE POSITION ESTIMATION USING UNSCENTED KALMAN FILTER." BAREKENG: Jurnal Ilmu Matematika dan Terapan 16, no. 1 (2022): 207–16. http://dx.doi.org/10.30598/barekengvol16iss1pp205-214.

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Missiles are military rocket weapons having an automatic control system to locate its targets or adjust its direction. Indonesia itself, which is a country of archipelago, covers air area of its largest territory, followed by sea area and land area. Logically, the existence of missile defense equipment (the main weapon system) or precisely the type of long-range missile is acceptable to support the defense and security of the Republic of Indonesia, but its consequences to be operated in the territory of Indonesia itself, in case of an occufanct of an error in targeting the target, will fall on

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Pető, Tamás, and Rudolf Seller. "Quad channel software defined receiver for passive radar application." Archives of Electrical Engineering 66, no. 1 (2017): 5–16. http://dx.doi.org/10.1515/aee-2017-0001.

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Abstract In recent times the growing utilization of the electromagnetic environment brings the passive radar researches more and more to the fore. For the utilization of the wide range of illuminators of opportunity the application of wideband radio receivers is required. At the same time the multichannel receiver structure has also critical importance in target direction finding and interference suppression. This paper presents the development of a multichannel software defined receiver specifically for passive radar applications. One of the relevant feature of the developed receiver platform

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Chen, Luwei, Jiacheng Ni, Ying Luo, Qifang He, and Xiaofei Lu. "Sparse SAR Imaging Method for Ground Moving Target via GMTSI-Net." Remote Sensing 14, no. 17 (2022): 4404. http://dx.doi.org/10.3390/rs14174404.

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Ground moving targets (GMT), due to the existence of velocity in range and azimuth direction, will lead to the deviation from their true position and defocus in the azimuth direction during the synthetic aperture radar (SAR) imaging process. To address this problem and compress the amount of echo data, a sparse SAR imaging method for ground moving targets is proposed. Specifically, we first constructed a two-dimensional sparse observation model of the GMT based on matched filter operators. Then, the observation model was solved by a deep network, GMT sparse imaging network (GMTSI-Net), which w

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Li, Xinpeng, Liping Chen, Qin Tang, et al. "Characteristics on the Spatial Distribution of Droplet Size and Velocity with Difference Adjuvant in Nozzle Spraying." Agronomy 12, no. 8 (2022): 1960. http://dx.doi.org/10.3390/agronomy12081960.

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The spatial distribution of droplet size and velocity affects the deposition and distribution on the target. In order to investigate the influence of different adjuvant and pressures on the spatial distribution of droplet size and velocity in atomization area of different nozzles, air induction flat fan nozzle IDK120-03, multi-range flat fan nozzle LU120-03 and anti-drift flat fan nozzle AD120-03 were selected. Phase Doppler Interferometer (PDI) was used to analyze and compare the distribution of droplet size and velocity in the atomization area of three nozzles when four typical adjuvant Mais

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Hideki, Toda, and Fujiuti Kouhei. "50 m-range distance and position measurement method by using two searchlights for autonomous flight device." International Journal of Engineering Research & Science 4, no. 7 (2018): 29–35. https://doi.org/10.5281/zenodo.1324112.

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<strong><em>Abstract</em></strong><strong>—</strong> <em>In the present study, 50 m-range distance and position measurement method for autonomous flight device such as four-rotor drone by using two searchlights was proposed, and the precise distance/position measurement performance was evaluated in an outdoor situation. To realize over 10 m long-distance flight of the drone under unstable GPS signal situations such as under the bridge or inside tunnels for periodic inspections, the correct self-position measurement is important for the stable control. This study is to propose a simple me

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Asaba, Kaoru, and Tomoyuki Miyamoto. "Attitude Determination of Photovoltaic Device by Means of Differential Absorption Imaging." Photonics 11, no. 1 (2023): 32. http://dx.doi.org/10.3390/photonics11010032.

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Future wireless power transmission will cover power levels up to kilowatts or more and transmission distances up to the scale of kilometers. With its narrow beam divergence angle, optical wireless power transmission (OWPT) is a promising candidate for such system implementations. In the operation of OWPT, it is necessary to estimate the position, direction (azimuth, elevation), and attitude of the target photovoltaic device before the power supply. The authors have proposed the detection of targets using differential absorption imaging and positioning with a combination of stereo imagery. In t

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Zhu, Xiaofan, Pingping Huang, Wei Xu, Weixian Tan, and Yaolong Qi. "A Modified Keystone-Based Forward-Looking Arc Array Synthetic Aperture Radar 3D Imaging Method." Sensors 23, no. 5 (2023): 2674. http://dx.doi.org/10.3390/s23052674.

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An arc array synthetic aperture radar (AA-SAR) is a new type of omnidirectional observation and imaging system. Based on linear array 3D imaging, this paper introduces a keystone algorithm combined with the arc array SAR 2D imaging method and proposes a modified 3D imaging algorithm based on keystone transformation. The first step is to discuss the target azimuth angle, retain the far-field approximation method of the first-order term, analyze the influence of the forward motion of the platform on the along-track position, and realize the two-dimensional focusing of the target slant range–azim

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WORYNA, E., P. PARYS, J. WOŁOWSKI, et al. "Angular distributions of ions from laser-produced plasma." Laser and Particle Beams 17, no. 2 (1999): 307–12. http://dx.doi.org/10.1017/s0263034699172173.

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This paper presents comprehensive experimental results of angular distributions of ions emitted from laser-produced plasmas. Performing a series of laser shots onto planar Sn, Au, and Pb targets, both the focusing conditions as well as the tilt angle of the target were changed to study the effect on the plasma expansion. In the experiments, the iodine laser system PERUN (laser energy of 30 J in 350 ps of duration) with laser power density of 5 × 1014 W/cm2 was used. For plasma diagnostics four ion collectors and an ion-energy analyzer were applied. Comparison of angular distribution of the fas

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Wilkinson, Michael G. T., XingYao (York) Wang, Noah J. Cowan, and Cynthia F. Moss. "Echolocating bats adjust sonar call features and head/ear position as they track moving targets in the presence of clutter." Journal of the Acoustical Society of America 157, no. 3 (2025): 2236–47. https://doi.org/10.1121/10.0036252.

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Echolocating bats often encounter clutter as they pursue insect prey. To probe the adaptive behaviors bats employ to mitigate the effects of clutter, this study quantified echolocation call features and head movements of big brown bats (Eptesicus fuscus) as they tracked a moving prey target in the dark. Bats were trained to rest on a perch and track an approaching target for a food reward. Clutter was positioned at different distances and angular offsets from the bat and the path of a moving target. This study hypothesized that bats dynamically adjust call features and head direction to facili

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Егорова, Е. Д., Е. А. Ищенко, А. Е. Медведев, Д. В. Пацев та С. М. Фёдоров. "ПЕЧАТНАЯ ЛОГОПЕРИОДИЧЕСКАЯ АНТЕННА ДЛЯ ШИРОКОПОЛОСНОГО ПЕЛЕНГАЦИОННОГО КОМПЛЕКСА". ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА 20, № 4 (2025): 106–10. https://doi.org/10.36622/1729-6501.2024.20.4.015.

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рассматривается печатная широкополосная антиподальная логопериодическая антенна, которая предназначена для реализации широкополосного пеленгационного комплекса. Предлагаемая конструкция антенны обладает простотой реализации, повторяемостью, а также стабильностью характеристик в широком диапазоне рабочих частот. Для реализации был выбран диапазон рабочих частот 900-1400 МГц, что позволяет обеспечить максимально широкое перекрытие диапазона, в котором работают автоматизированные роботизированные комплексы. Приводятся результаты электродинамического моделирования антенны, а также измерения характ

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Yukhno, S. A. "LOCATION OF RADIO SOURCE AND PARAMETERS OF ITS MOTION BY MEANS OF TWO-POSITION PASSIVE RADAR." Issues of radio electronics, no. 6 (June 21, 2019): 25–29. http://dx.doi.org/10.21778/2218-5453-2019-6-25-29.

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The article describes a method for determining the location of a mobile source of radio emission using two mobile passive radars located on surface ships by comparing the measured bearings on the source of radio emission from each radar with the assumed for a predetermined set of hypotheses about its movement (the initial range to the source of radio emission, speed and course). The method is based on the nomination of a number of hypotheses, the construction of a set of Kalman filters for each hypothesis, after filtering the calculation at each iteration of the sums of squares of residuals, f

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Sun, Qindong, and Hongkun Zhou. "An Acoustic Sea Glider for Deep-Sea Noise Profiling Using an Acoustic Vector Sensor." Polish Maritime Research 29, no. 1 (2022): 57–62. http://dx.doi.org/10.2478/pomr-2022-0006.

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Abstract An acoustic sea glider has been developed for ambient sea noise measurement and target detection through the deployment of an acoustic vector sensor (AVS). The glider was designed with three cabins connected in sequence and it can dive to depths exceeding 1200m. The AVS fixed on the glider measure acoustic pressure and particle velocities related to undersea noise, and the inner attitude sensors can effectively eliminate the estimation deviation of the direction of arrival. The inherent self-noises of the acoustic sea glider and AVS are presented respectively in respect to the Knudsen

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Wang, Jian Qiang, and Hua Ling Wu. "The Impact of Vertical Deflection on the Ballistic Missiles for Direction and Positioning." Applied Mechanics and Materials 568-570 (June 2014): 938–43. http://dx.doi.org/10.4028/www.scientific.net/amm.568-570.938.

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The direction and positioning of the missile could be affected by the vertical deflection which is at the launch point, so the impact point errors will increase. Based on the launch coordination, the target point position deviation formula which is caused by vertical deflection is deduced in this paper. The correction precise of the vertical deflection is also a factor of the impact point error. The simulation based on the deviation formula is conducted to analyze the affection of the vertical deflection and the correction precise of the vertical deflection. And the results show that the verti

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Metzger, Ryan R., O'Dhaniel A. Mullette-Gillman, Abigail M. Underhill, Yale E. Cohen, and Jennifer M. Groh. "Auditory Saccades From Different Eye Positions in the Monkey: Implications for Coordinate Transformations." Journal of Neurophysiology 92, no. 4 (2004): 2622–27. http://dx.doi.org/10.1152/jn.00326.2004.

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Auditory spatial information arises in a head-centered coordinate frame, whereas the saccade command signals generated by the superior colliculus (SC) are thought to specify target locations in an eye-centered frame. However, auditory activity in the SC appears to be neither head- nor eye-centered but in a reference frame that is intermediate between both of these reference frames. This neurophysiological finding suggests that auditory saccades might not fully compensate for changes in initial eye position. Here, we investigated whether the accuracy of saccades to sounds is affected by initial

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Toledo, Tomer, Charisma F. Choudhury, and Moshe E. Ben-Akiva. "Lane-Changing Model with Explicit Target Lane Choice." Transportation Research Record: Journal of the Transportation Research Board 1934, no. 1 (2005): 157–65. http://dx.doi.org/10.1177/0361198105193400117.

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The lane-changing model is an important component of microscopic traffic simulation tools. With the increasing popularity of these tools, a number of lane-changing models have been proposed and implemented in various simulators in recent years. Most of these models are based on the assumption that drivers evaluate the current and adjacent lanes and choose a direction of change (or no change) on the basis of the utilities of these lanes only. The lane choice set is therefore dictated by the current position of the vehicle and in multilane facilities would be restricted to a subset of the availa

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Li, Shunli, Qiuyi Zhang, Jinlun Li, Hongxin Zhao, Xiaoxing Yin, and Mei Yang. "Monopulse Antenna Based on Singular Spoof Surface Plasmon Polariton Structure for Angle Measurement." Electronics 9, no. 12 (2020): 2156. http://dx.doi.org/10.3390/electronics9122156.

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Direction finding and target tracking make demanding requirements on the measurement of incoming angles of electromagnetic waves. A monopulse antenna, based on the singular symmetric spoof surface plasmon polariton (SSPP) structure, is proposed for high-accuracy angle sensing. The singular SSPP structure is composed of periodic corrugated grooves for the confinement of the electromagnetic fields. Due to the microstrip–coplanar waveguide transition, the fields along both sides of the SSPP add constructively to form the endfire beam at the sum port and destructively to form the null radiation in

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Grexa, István, Tamás Fekete, Judit Molnár, et al. "Single-Cell Elasticity Measurement with an Optically Actuated Microrobot." Micromachines 11, no. 9 (2020): 882. http://dx.doi.org/10.3390/mi11090882.

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A cell elasticity measurement method is introduced that uses polymer microtools actuated by holographic optical tweezers. The microtools were prepared with two-photon polymerization. Their shape enables the approach of the cells in any lateral direction. In the presented case, endothelial cells grown on vertical polymer walls were probed by the tools in a lateral direction. The use of specially shaped microtools prevents the target cells from photodamage that may arise during optical trapping. The position of the tools was recorded simply with video microscopy and analyzed with image processin

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