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Journal articles on the topic 'Flight path correction'

Author: Grafiati

Published: 4 June 2025

Last updated: 15 July 2025

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1

Atygayev, Talgat, Victor Ivel, and Yulia Gerasimova. "Development of a hardware and software model of a rocket motion correction system." Eastern-European Journal of Enterprise Technologies 3, no. 3 (111) (2021): 15–23. http://dx.doi.org/10.15587/1729-4061.2021.228146.

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The paper deals with the development of a motion correction system for an unguided rocket of a certain class. The existing method for calculating the rocket flight range based on the dependence of flight path on the initial rocket pitch angle and average parameters of disturbing effects does not provide the required accuracy of the specified flight range. This is mainly due to uncontrolled range wind deviations in the flight area. At the same time, conducting test rocket launches to identify dispersion characteristics and improve the target accuracy leads to significant material costs. Therefo

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Talgat, Atygayev, Ivel Victor, and Gerasimova Yulia. "Development of a hardware and software model of a rocket motion correction system." Eastern-European Journal of Enterprise Technologies 3, no. 3 (111) (2021): 15–23. https://doi.org/10.15587/1729-4061.2021.228146.

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The paper deals with the development of a motion correction system for an unguided rocket of a certain class. The existing method for calculating the rocket flight range based on the dependence of flight path on the initial rocket pitch angle and average parameters of disturbing effects does not provide the required accuracy of the specified flight range. This is mainly due to uncontrolled range wind deviations in the flight area. At the same time, conducting test rocket launches to identify dispersion characteristics and improve the target accuracy leads to significant material costs. Therefo

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3

Mandić, S. "Dispersion reduction of artillery rockets guided by flight path steering method." Aeronautical Journal 120, no. 1225 (2016): 435–56. http://dx.doi.org/10.1017/aer.2016.4.

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ABSTRACTArtillery rockets are sensitive to disturbances (total impulse variation, wind, thrust misalignment, etc.). As the range of ground-to-ground rockets increases, the accuracy of free flight rockets decreases. Requirements for the increase of the range and minimisation of the impact point dispersions can be solved by adding guidance and control systems to rockets. Based on the differences between the measured flight parameters and the calculated parameters for the nominal trajectory, the flight path angle correction algorithm is obtained by adding the correction to the nominal value. The

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Gao, Jianfeng, Yu Zheng, Kai Ni, Qiliang Mei, Bin Hao, and Long Zheng. "Fast Path Planning for Firefighting UAV Based on A-Star algorithm." Journal of Physics: Conference Series 2029, no. 1 (2021): 012103. http://dx.doi.org/10.1088/1742-6596/2029/1/012103.

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Abstract When the long distance oil-gas pipeline accident occurs, the fire UAV can give priority to the place where the accident occurs. Emergency investigation and fire rescue, greatly reduces the harm of the accident. However, due to the limitation of the UAV navigation system, the UAV will accumulate the positioning errors over time in the flight process. If the positioning errors can not be corrected in time, it will make the UAV unable to reach the intended destination, thus leading to the failure of the rescue mission. In view of this phenomenon, we propose a UAV path planning scheme con

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Li, Zhao, Weihao Ma, and Haixiang Pang. "Multi-Objective Path Optimization Method for Maritime UAVs Equipped with Inertial Navigation Systems." Journal of Marine Science and Engineering 13, no. 5 (2025): 870. https://doi.org/10.3390/jmse13050870.

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Maritime unmanned aerial vehicles (UAVs) equipped with inertial navigation systems (INS) are prone to error accumulation, which can lead to excessive positioning errors and hinder their ability to perform long distance missions. To address this issue, this study first constructs a directed graph network for a flight area based on start and end points as well as error correction points. A multi-objective route planning model is then developed for a UAV, aiming to minimize both the flight distance and the number of positioning corrections. Considering the UAV’s turning radius, a trajectory lengt

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Cheng, Ningyi, Zhiqian Liu, and Yuqi Li. "Path Planning Algorithm of Dijkstra-Based Intelligent Aircraft under Multiple Constraints." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 38, no. 6 (2020): 1284–90. http://dx.doi.org/10.1051/jnwpu/20203861284.

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Aiming at the rapid planning of the optimal flight path of the intelligent aircraft, considering the error constraints and correction probability constraints, a model for intelligent aircraft path planning under multiple constraints is constructed, and a global search algorithm based on Dijkstra algorithm is proposed to solve the model. By calculating the residual error and restricts flight distance, the basic Dijkstra algorithm is improved to make it more adaptable to solve the path planning under multiple constraints. At the same time, simulation experiment is conducted with the optimal goal

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Jordan, James F. "Navigation of Spacecraft on Deep Space Missions." Journal of Navigation 40, no. 1 (1987): 19–29. http://dx.doi.org/10.1017/s0373463300000266.

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Spacecraft which are sent on deep space missions to the planets must be accurately navigated in order to achieve the correct flight path. Navigation analysts use precise measurements and large computational software systems to determine a spacecraft's position throughout the mission and compute the velocity corrections for its guidance through space. When the spacecraft is launched into deep space on its voyage, it is impossible to know with great precision where it is headed. Imperfections in both the launch vehicle's terminal velocity and the uncertainty in the knowledge of the parameters wh

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Wang, Lei, Ming Wei, Tao Yang, and Ping Liu. "Effects of Atmospheric Refraction on an Airborne Weather Radar Detection and Correction Method." Advances in Meteorology 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/407867.

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This study investigates the effect of atmospheric refraction, affected by temperature, atmospheric pressure, and humidity, on airborne weather radar beam paths. Using three types of typical atmospheric background sounding data, we established a simulation model for an actual transmission path and a fitted correction path of an airborne weather radar beam during airplane take-offs and landings based on initial flight parameters and X-band airborne phased-array weather radar parameters. Errors in an ideal electromagnetic beam propagation path are much greater than those of a fitted path when atm

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Agayev, N. B., Q. H. Orujov, and N. N. Kalbiyev. "Planning the Optimal Reference Flight Path of an Aircraft Using a Terrain Map." Mekhatronika, Avtomatizatsiya, Upravlenie 24, no. 9 (2023): 496–502. http://dx.doi.org/10.17587/mau.24.496-502.

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In connection with the development of aviation technology, the expansion of the functionality of modern aircraft and the complication of the tasks being solved, additional stringent requirements are imposed on the accuracy of air navigation. Along with high accuracy, navigation autonomy is also required. The autonomy of aircraft navigation implies the navigation of an aircraft without the use of active radar facilities. In this article, to calculate the optimal reference flight path of an aircraft in a horizontal plane, the Bellman dynamic programming method is proposed using a digital terrain

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Sabatini, Roberto, Terry Moore, and Chris Hill. "A New Avionics-Based GNSS Integrity Augmentation System: Part 2 – Integrity Flags." Journal of Navigation 66, no. 4 (2013): 501–22. http://dx.doi.org/10.1017/s0373463313000143.

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This paper presents the second part of the research activities carried out to develop a novel Global Navigation Satellite System (GNSS) Avionics-Based Integrity Augmentation (ABIA) system for manned and Unmanned Aerial Vehicle (UAV) applications. The ABIA system's architecture was developed to allow real-time avoidance of safety-critical flight conditions and fast recovery of the required navigation performance in case of GNSS data losses. In more detail, our novel ABIA system addresses all four cornerstones of GNSS integrity augmentation in mission- and safety-critical avionics applications:

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Mughni, Wali. "PAKISTAN'S NATIONAL AVIATION POLICY (2015) FLIGHT PATH, CROSS WINDS & OFF-COURSE." Journal of Air Transport Studies 8, no. 1 (2017): 92–107. http://dx.doi.org/10.38008/jats.v8i1.42.

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Pakistan is an emerging economy where the aviation policy, promulgated in April 2015, was designed to dramatically boost aviation activities, which in turn was expected to enhance the country’s economy. Ownership and market access liberalization, stringent adherence to international standards, subsidies, taxes and duty exemptions/reduction, emphasis on education, investor friendly environment, greater safety and security assurance, and above all, travel and business friendly culture was the strategic direction that Pakistan’s forward looking National Aviation Policy anticipated to achieve. Wel

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Zhang, Ming, Shuo Wang, and Hui Yu. "A Method of Rescue Flight Path Plan Correction Based on the Fusion of Predicted Low-altitude Wind Data." PROMET - Traffic&Transportation 28, no. 5 (2016): 479–85. http://dx.doi.org/10.7307/ptt.v28i5.1939.

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This study proposes a low-altitude wind prediction model for correcting the flight path plans of low-altitude aircraft. To solve large errors in numerical weather prediction (NWP) data and the inapplicability of high-altitude meteorological data to low altitude conditions, the model fuses the low-altitude lattice prediction data and the observation data of a specified ground international exchange station through the unscented Kalman filter (UKF)-based NWP interpretation technology to acquire the predicted low-altitude wind data. Subsequently, the model corrects the arrival times at the route

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Zhang, Hanming, Chunguang Xu, and Dingguo Xiao. "Offline correction of tool path deviations for robot-assisted ultrasonic nondestructive testing." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 8 (2018): 2879–93. http://dx.doi.org/10.1177/0954406218792581.

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Introducing industrial robots into ultrasonic nondestructive testing systems makes it possible to test more complex structures. However, the tool path planned in offline programming software may not fit with the actual path in practice, reducing the detection resolution of the system. This paper describes a robot-assisted ultrasonic nondestructive testing system and presents an approach to correct tool path deviations. A feature contained in normal vector angles is used to describe three-dimensional point clouds, in which a matching algorithm is used to calculate the deviations between two poi

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Jacewicz, Mariusz, Marcin Żugaj, Robert Głębocki, and Przemysław Bibik. "Quadrotor Model for Energy Consumption Analysis." Energies 15, no. 19 (2022): 7136. http://dx.doi.org/10.3390/en15197136.

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In this paper, a quadrotor dynamic model’s energy efficiency was investigated. A method for the design of the dynamic model which assures energy consumption estimation was presented. This model was developed to analyze the energy efficiency of the quadrotor during each maneuver. A medium-class quadrotor (4.689 kg) was used as a test platform. Thrust force correction factors obtained with FLIGHTLAB software were used to predict object behavior in forward flight. Model validation and long-duration flight tests in outdoor windy conditions are also presented. Monte-Carlo simulation was used to stu

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Qiao, Qing Qing, and Wan Chun Chen. "A Near Optimal Midcourse Guidance Law for Air-to-Air Missile." Applied Mechanics and Materials 336-338 (July 2013): 833–38. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.833.

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Dynamic inversion and singular perturbation methods are employed for medium-range air-to-air missile to obtain a near-optimal midcourse guidance law. The midcourse guidance stage is separated into two phases. In phase 1, which the rocket engine working, a dynamic inversion guidance law is used to guide the missile flight along a nominal trajectory. In the second gliding phase, singular perturbation technique is employed to develop a guidance law which maximum terminal specific energy. A terminal correction is made to ensure the seeker intercept the target. The result obtained from numerical si

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Romanyuk, V., and A. Grimud. "Algorithms for designing a trajectory of a communication aerial platform for collecting data from wireless sensor network nodes." Communication, informatization and cybersecurity systems and technologies 1, no. 6 (2024): 186–203. https://doi.org/10.58254/viti.6.2024.15.186.

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Algorithms are proposed for solving the problem designing the flight path of a communication aerial platform for collecting monitoring data from the nodes of a large-scale disconnected wireless sensor network to achieve various objective functions: minimizing the collection time or maximizing the network operation time. To achieve the given objective functions, the problem is solved by applying a certain sequence of algorithms: clustering, finding the shortest path and its correction according to the defined heuristics. Obtaining admissible solutions in real time is based on the application of

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Głębocki, Robert, and Mariusz Jacewicz. "MISSILE VERTICAL LAUNCH SYSTEM WITH REACTION CONTROL JETS." PROBLEMY TECHNIKI UZBROJENIA 145, no. 1 (2018): 25–46. http://dx.doi.org/10.5604/01.3001.0012.1271.

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The paper deals with a concept of a missile vertical launch system using reaction control jets. The purpose of the study was a detailed investigation of a method optimizing fuel consumption in the first phase of the missile flight to increase the range and optimize the flight path. In the designed system the missile is ejected vertically and turned to the desired position by using corrective engines before the sustainer motor is started. The dynamics and controllability of the missile at low velocities were studied. The physical and mathematical model of the object has been described, taking i

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18

Consani, Cristina, Norbert Druml, Markus Dielacher, and Marcus Baumgart. "Fog Effects on Time-of-Flight Imaging Investigated by Ray-Tracing Simulations." Proceedings 2, no. 13 (2018): 859. http://dx.doi.org/10.3390/proceedings2130859.

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Time-of-Flight (ToF) sensors are a key technology for autonomous vehicles and autonomous mobile robotics. Quantifying the extent of perturbation induced by atmospheric phenomena on ToF imaging is critical to identify effective correction strategies. Here we present an approach that uses optical ray-tracing to simulate the ToF image, while the distance information is recovered by analyzing the optical path of each ray. Such an approach allows, for example, understanding the effects of different ray paths on the ToF image, or testing various retrieval/correction algorithms upon running a single

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Bhadra, S., V. Sagan, C. Nguyen, M. Braud, A. L. Eveland, and T. C. Mockler. "AUTOMATIC EXTRACTION OF SOLAR AND SENSOR IMAGING GEOMETRY FROM UAV-BORNE PUSH-BROOM HYPERSPECTRAL CAMERA." ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences V-3-2022 (May 17, 2022): 131–37. http://dx.doi.org/10.5194/isprs-annals-v-3-2022-131-2022.

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Abstract. Calculating solar-sensor zenith and azimuth angles for hyperspectral images collected by UAVs are important in terms of conducting bi-directional reflectance function (BRDF) correction or radiative transfer modeling-based applications in remote sensing. These applications are even more necessary to perform high-throughput phenotyping and precision agriculture tasks. This study demonstrates an automated Python framework that can calculate the solar-sensor zenith and azimuth angles for a push-broom hyperspectral camera equipped in a UAV. First, the hyperspectral images were radiometric

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Min, J. E., S. K. Lee, and J. H. Ryu. "ADVANCED SURFACE-REFLECTED RADIANCE CORRECTION FOR AIRBORNE HYPERSPECTRAL IMAGERY IN COASTAL RED TIDE DETECTION." ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences V-3-2021 (June 17, 2021): 73–80. http://dx.doi.org/10.5194/isprs-annals-v-3-2021-73-2021.

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Abstract. Red tides are among the most common coastal hazards, causing serious damage to the coastal environment. Many satellite sensors can detect red tide blooms, but are limited in their detection of the exact area of the bloom and biological abundance in terms of spatial and spectral resolution. The high spatial and spectral resolutions of hyperspectral airborne remote sensing data may help overcome these limitations to analyze red tide blooms more effectively. To identify potential applications of hyperspectral airborne data in red tide detection, an integrated field campaign was performe

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Brenguier, J. L., F. Burnet, and O. Geoffroy. "Cloud optical thickness and liquid water path. Does the <i>k</i> coefficient vary with droplet concentration?" Atmospheric Chemistry and Physics Discussions 11, no. 2 (2011): 5173–215. http://dx.doi.org/10.5194/acpd-11-5173-2011.

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Abstract. Cloud radiative transfer calculations in general circulation models involve a link between cloud microphysical and optical properties. Indeed, the liquid water content expresses as a function of the mean volume droplet radius, while the light extinction is a function of their mean surface radius. There is a small difference between these two parameters because of the droplet spectrum width. This issue has been addressed by introducing an empirical multiplying correction factor to the droplet concentration. Analysis of in situ sampled data, however, revealed that the correction factor

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Brenguier, J. L., F. Burnet, and O. Geoffroy. "Cloud optical thickness and liquid water path – does the <i>k</i> coefficient vary with droplet concentration?" Atmospheric Chemistry and Physics 11, no. 18 (2011): 9771–86. http://dx.doi.org/10.5194/acp-11-9771-2011.

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Abstract. Cloud radiative transfer calculations in general circulation models involve a link between cloud microphysical and optical properties. Indeed, the liquid water content expresses as a function of the mean volume droplet radius, while the light extinction is a function of their mean surface radius. There is a small difference between these two parameters because of the droplet spectrum width. This issue has been addressed by introducing an empirical multiplying correction factor to the droplet concentration. Analysis of in situ sampled data, however, revealed that the correction factor

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Xia, Wenjie, Peichen Wang, Xunliang Yan, Bei Hong, and Xinguo Li. "Rapid and Near-Analytical Planning Method for Entry Trajectory under Time and Full-State Constraints." Aerospace 11, no. 7 (2024): 580. http://dx.doi.org/10.3390/aerospace11070580.

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A rapid trajectory-planning method based on an analytical predictor–corrector design of drag acceleration profile and a bank-reversal logic based on double-stage adaptive adjustment is proposed to solve the entry issue under time and full-state constraints. First, an analytical predictor–corrector algorithm is used to design the profile parameters to satisfy the terminal of altitude, velocity, range, time, and flight-path angle constraints. Subsequently, an adaptive lateral planning algorithm based on heading adjustment and maintenance is proposed to achieve the flight stage adaptive division

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Baburov, V. I., N. V. Ivantsevich, and O. I. Sauta. "METHOD OF DIFFERENTIAL CORRECTION OF THE NAVIGATIONAL FIELD OF SHORT-RANGE NAVIGATION AND LANDING SYSTEMS WITH USE GLONASS." Issues of radio electronics, no. 7 (July 20, 2018): 6–12. http://dx.doi.org/10.21778/2218-5453-2018-7-6-12.

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The effective requirements of the International Civil Aviation Organization (ICAO) for accuracy and reliability of aircraft (AC) positioning, especially in case of flights in the airfield area, make it particularly relevant to harmonize the accuracy characteristics of various radio systems so that any of them can be utilized during the flight. AC positioning accuracy amounts to several metres for standard GNSS modes or several centimetres for differential modes. At the same time, positioning errors for traditional short-range navigation and landing systems (VOR/DME, SHORAN or ILS), especially

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Montenbruck, Oliver, and Eberhard Gill. "Ionospheric Correction for GPS Tracking of LEO Satellites." Journal of Navigation 55, no. 2 (2002): 293–304. http://dx.doi.org/10.1017/s0373463302001789.

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This paper describes an ionospheric correction technique for single frequency GPS measurements from satellites in low Earth orbit. The fractional total electron content (TEC) above the receiver altitude is obtained from global TEC maps of the International GPS Service network and an altitude dependent scale factor. By choosing a suitable effective height of the residual ionosphere, the resulting path delay for positive elevations is then computed from a thin layer approximation. The scale factor can be predicted from the assumption of a Chapman profile for the altitude variation of the electro

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Zhou, Yandong. "The Application of Intelligent Robots and Deep Learning in the Construction Management Platform System of Construction Engineering." Scalable Computing: Practice and Experience 25, no. 5 (2024): 3277–87. http://dx.doi.org/10.12694/scpe.v25i5.3060.

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In order to solve the problem of duplicate data entry between construction management platform systems in construction engineering, the author proposes to apply RPA intelligent process robots to replace manual data collection, operation, entry, and verification. The design of the system is divided into overall architecture, instruction program loading process, human-machine interaction system level services, and other levels. An end-to-end procedural instruction transmission control method is adopted, establish a low-level control command output module for the online calibration system of the

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Obligis, E., L. Eymard, N. Tran, S. Labroue, and P. Femenias. "First Three Years of the Microwave Radiometer aboard Envisat: In-Flight Calibration, Processing, and Validation of the Geophysical Products." Journal of Atmospheric and Oceanic Technology 23, no. 6 (2006): 802–14. http://dx.doi.org/10.1175/jtech1878.1.

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Abstract The Envisat microwave radiometer is designed to correct the satellite altimeter data for the excess path delay resulting from tropospheric humidity. Neural networks have been used to formulate the inversion algorithm to retrieve this quantity from the measured brightness temperatures. The learning database has been built with European Centre for Medium-Range Weather Forecasts (ECMWF) analyses and simulated brightness temperatures by a radiative transfer model. The in-flight calibration has been performed in a consistent way by adjusting measurements on simulated brightness temperature

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Sieberth, T., R. Wackrow, and J. H. Chandler. "Influence of blur on feature matching and a geometric approach for photogrammetric deblurring." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-3 (August 11, 2014): 321–26. http://dx.doi.org/10.5194/isprsarchives-xl-3-321-2014.

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Unmanned aerial vehicles (UAV) have become an interesting and active research topic for photogrammetry. Current research is based on images acquired by a UAV, which have a high ground resolution and good spectral and radiometric resolution, due to the low flight altitudes combined with a high resolution camera. UAV image flights are also cost efficient and have become attractive for many applications including change detection in small scale areas. <br><br> One of the main problems preventing full automation of data processing of UAV imagery is the degradation effect of blur caused

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Mandlburger, G., N. Pfeifer, and U. Soergel. "WATER SURFACE RECONSTRUCTION IN AIRBORNE LASER BATHYMETRY FROM REDUNDANT BED OBSERVATIONS." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences IV-2/W4 (September 13, 2017): 123–30. http://dx.doi.org/10.5194/isprs-annals-iv-2-w4-123-2017.

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In airborne laser bathymetry knowledge of exact water level heights is a precondition for applying run-time and refraction correction of the raw laser beam travel path in the medium water. However, due to specular reflection especially at very smooth water surfaces often no echoes from the water surface itself are recorded (drop outs). In this paper, we first discuss the feasibility of reconstructing the water surface from redundant observations of the water bottom in theory. Furthermore, we provide a first practical approach for solving this problem, suitable for static and locally planar wat

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Vorobуev, V. V., A. P. Beliatskaya, and A. A. Supolka. "Methodic aspects of aircraft glide slope correction for prevention of CFIT category accidents during pre-landing descent." Civil Aviation High Technologies 23, no. 4 (2020): 33–44. http://dx.doi.org/10.26467/2079-0619-2020-23-4-33-44.

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Aviation accidents of the category of controlled flight into terrain in world commercial aviation are included into three "killers" in aviation together with loss of control in flight (LOC-I) and runway excursions (RE). As a result of long-term research of this problem the methods of CFIT risk level reduction, pilot training and retraining programs were developed and put into practice. Also several generations of onboard ground proximity or obstacle warning systems were created (GPWS, EGPWS, TAWS), the disadvantage of which is a passive – advisory type of warnings. The conclusions of the commi

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Zhang, Ben, Anxi Yu, Xing Chen, Zhengbin Wang, and Zhen Dong. "Comparative Analysis of Single-View and Multi-View Airborne SAR Positioning Error and Course Planning for Multi-View Airborne SAR Optimal Positioning." Remote Sensing 14, no. 13 (2022): 3055. http://dx.doi.org/10.3390/rs14133055.

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Airborne synthetic aperture radar (Airborne SAR) can accurately locate key targets and regions by using the flight parameters of the aircraft and the relative position information between the aircraft and the target which can be obtained from the airborne positioning and orientation system (POS). In the course of flight, the aircraft will deviate from the ideal flight path due to atmospheric turbulence, which results in the calculation deviating from the actual target position. In order to improve the target positioning accuracy, it is necessary to study the influence of aircraft motion error

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Степанов, Анатолий Васильевич, Алексей Николаевич Маньшин та Сергей Анатольевич Кедь. "КУРСОВЫЕ СИСТЕМЫ В АВИАЦИИ И ИХ ВЛИЯНИЕ НА БЕЗОПАСНОСТЬ ПОЛЕТОВ". ПРОБЛЕМЫ БЕЗОПАСНОСТИ ПОЛЕТОВ, № 6 (1 червня 2024): 32–41. https://doi.org/10.36535/0235-5000-2024-06-3.

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В статье представлен обзор курсовых систем, применяемых в авиации. Курсовые системы являются важной частью авиационных систем навигации, предназначенных для обеспечения точности и безопасности полетов. Рассматриваются различные типы курсовых систем, включая инерциальные системы, GPS и гироскопические системы, описывается их принцип работы, особенности и преимущества каждой системы. Представлены современные технологии и разработки в области курсовых систем, включая автоматическую коррекцию пути и интеграцию с другими навигационными системами. The article provides an overview of exchange rate sy

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Roberts, Ricardo, Manlio Barajas, Ernesto Rodriguez-Leal, and José Luis Gordillo. "Haptic feedback and visual servoing of teleoperated unmanned aerial vehicle for obstacle awareness and avoidance." International Journal of Advanced Robotic Systems 14, no. 4 (2017): 172988141771636. http://dx.doi.org/10.1177/1729881417716365.

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Obstacle avoidance represents a fundamental challenge for unmanned aerial vehicle navigation. This is particularly relevant for low altitude flight, which is highly subjected to collisions, causing property damage or even compromise human safety. Autonomous navigation algorithms address this problem and are applied in various tasks. However, this approach is usually overshadowed by unreliable results in uncertain environments. In contrast, human pilots are able to maneuver vehicles in complex situations, in which an algorithm would no offer a reliable performance. This article explores a novel

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Guo, Minwen, Xiangyu Huang, Maodeng Li, Jinchang Hu, and Chao Xu. "Adaptive entry guidance for the Tianwen-1 mission." Astrodynamics 6, no. 1 (2022): 17–26. http://dx.doi.org/10.1007/s42064-021-0120-2.

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AbstractTo meet the requirements of the Tianwen-1 mission, adaptive entry guidance for entry vehicles, with low lift-to-drag ratios, limited control authority, and large initial state bias, was presented. Typically, the entry guidance law is divided into four distinct phases: trim angle-of-attack phase, range control phase, heading alignment phase, and trim-wing deployment phase. In the range control phase, the predictor—corrector guidance algorithm is improved by planning an on-board trajectory based on the Mars Science Laboratory (MSL) entry guidance algorithm. The nominal trajectory was des

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Semenov, Serhii, Magdalena Krupska-Klimczak, Olga Wasiuta, et al. "Intelligent Assurance of Resilient UAV Navigation Under Visual Data Deficiency for Sustainable Development of Smart Regions." Sustainability 17, no. 13 (2025): 6030. https://doi.org/10.3390/su17136030.

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Ensuring the resilient navigation of unmanned aerial vehicles (UAVs) under conditions of limited or unstable sensor information is one of the key challenges of modern autonomous mobility within smart infrastructure and sustainable development. This article proposes an intelligent autonomous UAV control method based on the integration of geometric trajectory modeling, neural network-based sensor data filtering, and reinforcement learning. The geometric model, constructed using path coordinates, allows the trajectory tracking problem to be formalized as an affine control system, which ensures mo

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Tang, Gang, Jiaxu Gu, Weidong Zhu, Christophe Claramunt, and Peipei Zhou. "HD Camera-Equipped UAV Trajectory Planning for Gantry Crane Inspection." Remote Sensing 14, no. 7 (2022): 1658. http://dx.doi.org/10.3390/rs14071658.

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While Unmanned Aerial Vehicles (UAVs) can be a valuable solution for the damage inspection of port machinery infrastructures, their trajectories are still prone to collision risks, trajectory non-smoothness, and large deviations. This research introduces a trajectory optimization method for inspecting vulnerable parts of a gantry crane by a UAV fitted with a high-definition (HD) camera. We first analyze the vulnerable parts of a gantry crane, then use the A* algorithm to plan a path for the UAV. The trajectory optimization process is divided into two steps, the first is a trajectory correction

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NAKAZAWA, Toshiyasu, Naoaki SHINOHARA, Masayuki SUGAWARA, Kazuyuki HANAKA, Tomohiro KOBAYASHI, and Ryo YAMAMOTO. "Study on noise calculation method considering gear and flap conditions during aircraft landing." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 5 (2023): 3070–76. http://dx.doi.org/10.3397/in_2023_0445.

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Looking at recent aircraft noise by component, engine noise has become quieter, while aerodynamic noise such as airframe noise, gear, and flap noise has become relatively louder. Gradually, it has become necessary to take aerodynamic noise into account appropriately. Therefore, using the regression calculation results of aircraft noise by J-FRAIN, we examined to modify performance data and Noise-Power-Distance (NPD)data, which represent component changes consistent with the AERC model, an existing aircraft noise model in Japan. For performance data, gear and flap parameters were added to the a

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Karaoulis, Marios, Ipo Ritsema, Chris Bremmer, Marco De Kleine, Gualbert Oude Essink, and Edvard Ahlrichs. "Drone-Borne Electromagnetic (DR-EM) Surveying in The Netherlands: Lab and Field Validation Results." Remote Sensing 14, no. 21 (2022): 5335. http://dx.doi.org/10.3390/rs14215335.

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In the past decade, drones have become available and affordable for civil applications, including mapping and monitoring the Earth with geophysical sensors. In 2017 and 2019, the feasibility of executing frequency domain electromagnetic (FDEM) surveys using an off-the-shelf drone was investigated at Deltares Institute. This paper reports firstly the preparatory tests executed to determine the optimal instrumental configuration, flight path, data processing and inversion schemes and secondly the three field validation tests executed to demonstrate the feasibility of the drone-borne electromagne

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Frery, Marie-Laure, Mathilde Siméon, Christophe Goldstein, et al. "Sentinel-3 Microwave Radiometers: Instrument Description, Calibration and Geophysical Products Performances." Remote Sensing 12, no. 16 (2020): 2590. http://dx.doi.org/10.3390/rs12162590.

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Copernicus Sentinel-3 Surface Topography Mission embarks a two-channel microwave radiometer combined with the altimeter in order to correct the altimeter range for the excess path delay resulting from the presence of water vapour in the troposphere. The in-flight calibration of a single instrument is the critical point to achieve the expected performances. In the context of a constellation, the inter-calibration is even more important. After a presentation of the instrument design, we present the diagnoses used for the calibration of Sentinel-3A, using vicarious calibration over specific areas

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Белецкий, Александр, Aleksandr Beletsky, Александр Михалев, et al. "Optical effects produced by running onboard engines of low-earth-orbit spacecraft." Solnechno-Zemnaya Fizika 2, no. 4 (2016): 85–91. http://dx.doi.org/10.12737/21169.

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This paper presents the results of optical observations in Radar-Progress Experiment between April 17, 2013 and July 30, 2014 after switching on the approach-correction engine (ACE) of Progress M-17M and Progress M-23M cargo spacecraft in the thermosphere. A region of enhanced emission intensity was recorded during engine operation. This may have been related to the scatter of twilight solar emission along the cargo spacecraft exhaust and to the emergence of an additional atomic oxygen [OI] 630 nm. The maximum size of emission region, we observed, was ~ 330-350 km and ~ 250-270 km along and ac

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Rahman, Ehab Ur, Yihong Zhang, Sohail Ahmad, Hafiz Ishfaq Ahmad, and Sayed Jobaer. "Autonomous Vision-Based Primary Distribution Systems Porcelain Insulators Inspection Using UAVs." Sensors 21, no. 3 (2021): 974. http://dx.doi.org/10.3390/s21030974.

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The early detection of damaged (partially broken) outdoor insulators in primary distribution systems is of paramount importance for continuous electricity supply and public safety. Unmanned aerial vehicles (UAVs) present a safer, autonomous, and efficient way to examine the power system components without closing the power distribution system. In this work, a novel dataset is designed by capturing real images using UAVs and manually generated images collected to overcome the data insufficiency problem. A deep Laplacian pyramid-based super-resolution network is implemented to reconstruct high-r

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Refaat, Tamer F., Mulugeta Petros, Charles W. Antill та ін. "Airborne Testing of 2-μm Pulsed IPDA Lidar for Active Remote Sensing of Atmospheric Carbon Dioxide". Atmosphere 12, № 3 (2021): 412. http://dx.doi.org/10.3390/atmos12030412.

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The capability of an airborne 2-μm integrated path differential absorption (IPDA) lidar for high-accuracy and high-precision active remote sensing of weighted-average column dry-air volume mixing ratio of atmospheric carbon dioxide (XCO2) is demonstrated. A test flight was conducted over the costal oceanic region of the USA to assess instrument performance during severe weather. The IPDA targets CO2 R30 absorption line using high-energy 2-μm laser transmitter. HgCdTe avalanche photodiode detection system is used in the receiver. Updated instrument model included range correction factor to acco

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Henry, Paul. "Towards routine study of hydrogenous materials using powder neutron diffraction." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1739. http://dx.doi.org/10.1107/s2053273314082606.

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Hydrogen (1H) is an element that is ubiquitous in chemistry and materials science. Neutron diffraction is the preferred technique for studying 1H-containing compounds, but is complicated by the high incoherent scattering cross section, which also varies with wavelength. This variation of scattering cross section as a function of wavelength/energy and chemical environment is not well understood.[1-2] This is surprising as it is the largest contributing factor to the scattering properties used in single crystal and powder neutron diffraction experiments to calculate the optimal sample size for h

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Mandlburger, Gottfried, Martin Pfennigbauer, Roland Schwarz, Sebastian Flöry, and Lukas Nussbaumer. "Concept and Performance Evaluation of a Novel UAV-Borne Topo-Bathymetric LiDAR Sensor." Remote Sensing 12, no. 6 (2020): 986. http://dx.doi.org/10.3390/rs12060986.

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We present the sensor concept and first performance and accuracy assessment results of a novel lightweight topo-bathymetric laser scanner designed for integration on Unmanned Aerial Vehicles (UAVs), light aircraft, and helicopters. The instrument is particularly well suited for capturing river bathymetry in high spatial resolution as a consequence of (i) the low nominal flying altitude of 50–150 m above ground level resulting in a laser footprint diameter on the ground of typically 10–30 cm and (ii) the high pulse repetition rate of up to 200 kHz yielding a point density on the ground of appro

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Kudriashov, Viktor, Oleksii Kolomiitsev, Kostyantyn Lukin, Mykola Slipchenko, and Paweł Bernat. "METHODOLOGY OF THE NUMERICAL MODELLING OF PARAMETERS DETERMINATION OF THE RADIOMETRIC IMAGE OF REMOTE EARTH SURFACE SENSING BY BISTATIC RADIOMETER." Advanced Information Systems 9, no. 1 (2025): 35–42. https://doi.org/10.20998/2522-9052.2025.1.04.

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The on-board bistatic radiometer (BR) provides sufficiently high-quality mapping of various terrestrial surfaces. The subject of study in the article is the determination of parameters of radiometric images (RI) of earth surfaces based on the BR construction options that are technically feasible. The aim of the research is to develop a methodology for numerical modelling of RI parameters calculation during remote sensing of the earth's surfaces by BR. Tasks: To consider the range of the radar, accounting for image bands, detection, and measurement of course difference, and resolution along the

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Selecký, Martin, Petr Váňa, Milan Rollo, and Tomáš Meiser. "Wind Corrections in Flight Path Planning." International Journal of Advanced Robotic Systems 10, no. 5 (2013): 248. http://dx.doi.org/10.5772/56455.

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Liu, Xiaonan, Weiya Kong, Hanwei Sun, and Yaobing Lu. "Performance Analysis of Ku/Ka Dual-Band SAR Altimeter from an Airborne Experiment over South China Sea." Remote Sensing 14, no. 10 (2022): 2362. http://dx.doi.org/10.3390/rs14102362.

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Satellite radar altimeters have been successfully used for sea surface height (SSH) measurement for decades, gaining great insight in oceanography, meteorology, marine geology, etc. To further improve the observation precision and spatial resolution, radar altimeters have evolved from real aperture to synthetic aperture, from the Ku-band to Ka-band. Future synthetic aperture radar (SAR) altimeter of the Ka-band is expected to achieve better performance than its predecessors. To verify the SAR altimeter data processing method and explore the system advantage of the Ka-band, a Ku/Ka dual-band SA

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Perrin, Olivier, Maurizio Scaramuzza, Thomas Buchanan, and Daniel Brocard. "Flying EGNOS Approaches in the Swiss Alps." Journal of Navigation 59, no. 2 (2006): 177–85. http://dx.doi.org/10.1017/s0373463306003754.

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The European Geostationary Navigation Overlay Service (EGNOS) system is being developed in Europe to provide Global Positioning System (GPS) and GLONASS regional augmentation services to aviation, maritime and land users. The EGNOS system, as any other Wide Area Augmentation System (WAAS), relies on the broadcast of differential correction and integrity information in the pseudo-range domain, which are then used to provide a solution in the position domain. EGNOS is a major element of the European Satellite Navigation Program, which is jointly being implemented by the Commission of the Europea

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Cao, Xifeng, Lu Zhang, Xingying Zhang, et al. "Study on the Impact of the Doppler Shift for CO2 Lidar Remote Sensing." Remote Sensing 14, no. 18 (2022): 4620. http://dx.doi.org/10.3390/rs14184620.

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Atmospheric carbon dioxide (CO2) is recognized as the most important component of the greenhouse gases, the concentration of which has increased rapidly since the pre-industrial era due to anthropogenic emissions of greenhouse gases (GHG). The accurate monitoring of carbon dioxide is essential to study the global carbon cycle and radiation budget on Earth. The Aerosol and Carbon Detection Lidar (ACDL) instrument onboard the Atmospheric Environmental Monitoring Satellite (AEMS) was successfully launched in April 2022, which allows a new perspective to quantify the global spatial distribution of

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Shi, Shuo, Qian Xu, Chengyu Gong, Wei Gong, Xingtao Tang, and Bowei Zhou. "Analysis, Simulation, and Scanning Geometry Calibration of Palmer Scanning Units for Airborne Hyperspectral Light Detection and Ranging." Remote Sensing 17, no. 8 (2025): 1450. https://doi.org/10.3390/rs17081450.

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Airborne hyperspectral LiDAR (AHSL) is a technology that integrates the spectral content collected using hyperspectral imaging and the precise 3D descriptions of observed objects obtained using LiDAR (light detection and ranging). AHSL detects the spectral and three-dimensional (3D) information on an object simply using laser measurements. Nevertheless, the advantageous richness of spectral properties also introduces novel issues into the scan unit, the mechanical–optical trade-off. Specifically, the abundant spectral information requires a larger optical aperture, limiting the acceptance of t

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