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Journal articles on the topic 'Sideload'

Author: Grafiati

Published: 22 February 2023

Last updated: 31 July 2025

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1

Budi, Sigit Setijo, Firman Lukman Sanjaya, Faqih Fatkhurrozak, Syarifudin Syarifudin, and Nur Aidi Ariyanto. "Analisis Perpindahan Gaya SideLoad Pegas Suspensi Tipe C Menggunakan Finite Element Method (FEM)." Infotekmesin 14, no. 2 (2023): 208–13. http://dx.doi.org/10.35970/infotekmesin.v14i2.1783.

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The suspension must provide comfort and safety to the vehicle. Therefore, it is necessary to analyze the load's effect on the pressure distribution on the axle so that the spring strength from the sideload force can be simulated. This study aims to analyze the sideload force of type C suspension springs using FEM. Spring variations are the number of different threaded coils, namely 11, 12, and 13. In the FEM simulation, the spring is given a load until 50mm, 100mm, 150mm, 200mm, and 250mm displacement occurs. The loading spreads to the X, Y, and Z axes. Each direction of the axis is measured b

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Bently, D. E., P. Goldman, and A. Muszynska. "“Snapping” Torsional Response of an Anisotropic Radially Loaded Rotor." Journal of Engineering for Gas Turbines and Power 119, no. 2 (1997): 397–403. http://dx.doi.org/10.1115/1.2815588.

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A rotor system with two orthogonal lateral and two angular (torsional) degrees of freedom is considered. The rotor has asymmetry of the lateral stiffness and is laterally loaded with a constant radial force and a rotating unbalance. Constant driving and load torques are applied to the rotor. The important part of the research includes an analysis of “snapping” action, when, during rotation, the rotor experiences a peak of torsional acceleration. This occurs when the “strong stiffness” axis of the anisotropic rotor passes under the axis of the sideload. The numerical simulation of the analytica

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3

Parshina, E. S. "Technique for spatial interference reduction and its application in monopulse radar with active phased array antenna." Issues of radio electronics, no. 12 (February 3, 2021): 17–22. http://dx.doi.org/10.21778/2218-5453-2020-12-17-22.

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The paper describes monopulse radar with sidelobe-blanking system. The antenna of the sidelobe-blanking system is one subarray of the radar’s active phased array antenna. The elements of the subarray is also used for sum and difference pattern generation. It is shown that if aperture distribution required to produce low-sidelobe sum pattern is used, the pattern of one subarray will satisfy the requrements for antenna of the sidelobe-blanking system. An example of designing the monopulse radar with sidelobe-blanking system is presented. Sum pattern of the radar anettena is produced with differe

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Li, C., X. Zhou, D. Tang, and Z. Zhu. "RESOLUTION ENHANCEMENT ALGORITHM FOR SPACEBORN SAR BASED ON HANNING FUNCTION WEIGHTED SIDELOBE SUPPRESSION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3 (April 30, 2018): 771–73. http://dx.doi.org/10.5194/isprs-archives-xlii-3-771-2018.

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Resolution and sidelobe are mutual restrict for SAR image. Usually sidelobe suppression is based on resolution reduction. This paper provide a method for resolution enchancement using sidelobe opposition speciality of hanning window and SAR image. The method can keep high resolution on the condition of sidelobe suppression. Compare to traditional method, this method can enchance 50&amp;thinsp;% resolution when sidelobe is &amp;minus;30dB.

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Miao, Ke, Yi Zhang, Handan Jing, Shuoguang Wang, and Houjun Sun. "Fast Sidelobe Calculation for Planar Phased Arrays Using an Iterative Sidelobe Seeking Method." Electronics 11, no. 20 (2022): 3366. http://dx.doi.org/10.3390/electronics11203366.

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Sidelobe level is a key parameter for phased array design. However, the conventional method for sidelobe level calculation is time-consuming due to the high sampling number of the radiation pattern. In this paper, an iterative sidelobe-seeking method for sidelobe calculation of arbitrarily distributed planar arrays is proposed to shorten the computing time. By applying Newton’s iterative method with an approximate formula, the proposed method uses less sampling to obtain the sidelobe positions and the peak sidelobe level. Numerical experiments were carried out and verified the effectiveness of

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Park, Cheol, and Suk-Seung Hwang. "Generalized Sidelobe Canceler for TPMS Interference Cancellation." Journal of Korean Institute of Intelligent Systems 22, no. 5 (2012): 663–68. http://dx.doi.org/10.5391/jkiis.2012.22.5.663.

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Xu, Wei, Ying Tian, Pingping Huang, Weixian Tan, and Yaolong Qi. "Frequency Diversity Arc Array with Angle-Distance Two-Dimensional Broadening Null Steering for Sidelobe Suppression." Electronics 13, no. 9 (2024): 1640. http://dx.doi.org/10.3390/electronics13091640.

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The frequency diversity arc array (FDAA) improves the structure of the traditional frequency diversity array (FDA) from a linear array structure to an arc array structure, so that the FDAA not only has the advantages of the FDA but also has a large angle and omnidirectional scanning capability. However, when it is equivalent to a linear array, this arc-shaped structure will lead to the phenomenon of inverse density weighting, which leads to a higher sidelobe level of the FDAA beam pattern. In order to solve the problem of a high sidelobe level at a certain position of the FDAA, a frequency div

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Zhu, Haibin, Yaxin Mu, Wupeng Xie, et al. "Deep Metric Learning for Fine-Grained Ship Classification in SAR Images with Sidelobe Interference." Remote Sensing 17, no. 11 (2025): 1835. https://doi.org/10.3390/rs17111835.

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The interference of sidelobe often causes different targets to exhibit similar features, diminishing fine-grained classification accuracy. This effect is particularly pronounced when the available data are limited. To address the aforementioned issues, a novel classification framework for sidelobe-affected SAR imagery is proposed. First, a method based on maximum median filtering is adopted to remove sidelobe by exploiting local grayscale differences between the target and sidelobe, constructing a high-quality SAR dataset. Second, a deep metric learning network is constructed for fine-grained

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Hao, Yan Zhong, Jing Shan Jiao, Fu Chun Zhang, Wang Hui, and Shu Qiang Wang. "Study on Jamming to Sidelobe Cancellation of Phased-Array Radar." Advanced Materials Research 756-759 (September 2013): 3937–40. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.3937.

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Antenna sidelobe cancellation is effective method to repress radar sidelobe jamming. This paper analysed the function and characteristics completely based on the principle of sidelobe cancellation, and look for jamming method more effective according to the weakness and technique crux. The results indicate that the adaptive side lobe cancellation technique can effectively antagonize the active jamming.

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10

Korobeinikov, A. V., and V. S. Osipov. "About binary codes with low mean sidelobe level." Issues of radio electronics, no. 10 (October 31, 2019): 52–55. http://dx.doi.org/10.21778/2218-5453-2019-10-52-55.

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It has been revealed, that useful properties of codes with low mean sidelobe level of autocorrelation function are manifested when the impulses pack is jointly processed in the form of low relative level sidelobes of cumulative autocorrelation function. The use of codes with low mean sidelobe level potentially allows to provide the lowest sidelobe level of cumulative autocorrelation function in case of non-coherent accumulation, as well as to ensure a low sidelobe level in case of coherent accumulation. Criteria of search of codes with low mean sidelobe level lasting from 10 to 26 elements by

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Dong, Xiao, Hailin Li, Ke Wang, Yanwei Zhang, and Yongyan Chu. "Multiband Pattern Synthesis of Time-Modulated Conformal Array with Quadratic Convex Optimization Algorithm." International Journal of RF and Microwave Computer-Aided Engineering 2023 (May 8, 2023): 1–16. http://dx.doi.org/10.1155/2023/7631954.

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Aiming at the multiband pattern synthesis problem of time-modulated conformal array antenna, a quadratic convex optimization algorithm is proposed for sum and difference beamforming with low sidelobe levels. This articles method synthesizes a difference beam with a low sidelobe level by generating nulls at the center frequency band and optimizing the switch-on duration time of array elements. And the sum beamforming and sidelobe suppression of the first-order sideband are realized by optimizing the switch-on instant time of the array elements. The proposed algorithm has excellent properties of

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Wang Zhengzhou, 王拯洲, 段亚轩 Duan Yaxuan, 王力 Wang Li, 李刚 Li Gang та 郭嘉富 Guo Jiafu. "基于旁瓣光束衍射反演的远场测量旁瓣波峰参数检测方法". Infrared and Laser Engineering 52, № 1 (2023): 20220281. http://dx.doi.org/10.3788/irla20220281.

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Gopalkrishna, Raghavendra C., Harish Kumar, and Manohara Choudapur. "A Novel Approach to Control the Sidelobe Levels in Orthogonal Frequency Division Multiplexing Radar Waveform Design Using Broyden-Fletcher-Goldfarb-Shanno Algorithm." Journal Européen des Systèmes Automatisés 53, no. 4 (2020): 575–80. http://dx.doi.org/10.18280/jesa.530417.

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Employing orthogonal frequency division multiplexing (OFDM) for radar applications has attracted many researchers in recent days. In OFDM systems the reduction of out-of-band (OOB) radiations is one of the most discussed and researched topics. To successfully design an OFDM based overlay system, it is necessary to reduce the sidelobe levels in OFDM signals. In this paper a novel technique for reducing the sidelobe in OFDM radar signals is projected and examined. Subcarrier weighting technique is the method used to scale down the sidelobe heights by multiplying real valued weighting coefficient

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Chen, Hung-Chen, Tsenchieh Chiu, and Ching-Luh Hsu. "Millimetre-Wave Planar Phased Patch Array with Sidelobe Suppression for High Data-Rate Transmission." International Journal of Antennas and Propagation 2019 (December 20, 2019): 1–7. http://dx.doi.org/10.1155/2019/7691912.

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A design of 38 GHz planar phased patch array with sidelobe suppression for data-rate enhancement is proposed in the paper. The proposed array is formed of three 24-element subarrays of patches. Each patch has its own transmit/receive modules (TRM) consisting of a digitally controlled attenuator and phase shifter. In order to achieve high data-rate communications, the noise, especially due to the undesired signals received from the sidelobes, should be reduced with high sidelobe suppression of subarray. The sidelobe suppression of the proposed subarray is first improved to 17.92 dB with a diamo

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Kubota, Takuji, Toshio Iguchi, Masahiro Kojima, et al. "A Statistical Method for Reducing Sidelobe Clutter for the Ku-Band Precipitation Radar on board the GPM Core Observatory." Journal of Atmospheric and Oceanic Technology 33, no. 7 (2016): 1413–28. http://dx.doi.org/10.1175/jtech-d-15-0202.1.

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AbstractA statistical method to reduce the sidelobe clutter of the Ku-band precipitation radar (KuPR) of the Dual-Frequency Precipitation Radar (DPR) on board the Global Precipitation Measurement (GPM) Core Observatory is described and evaluated using DPR observations. The KuPR sidelobe clutter was much more severe than that of the Precipitation Radar on board the Tropical Rainfall Measuring Mission (TRMM), and it has caused the misidentification of precipitation. The statistical method to reduce sidelobe clutter was constructed by subtracting the estimated sidelobe power, based upon a multipl

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Liu, Zhenghong, Haocheng Zhou, Xiyu Song, Mei Wang, and Liuqing Weng. "Multi-Objective NSGA-II Optimization for Broadband Beamforming with Spherical Harmonic Domain Assistance." Sensors 23, no. 20 (2023): 8403. http://dx.doi.org/10.3390/s23208403.

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Sidelobe suppression is a major challenge in wideband beamforming for acoustic research, especially in high noise and reverberation environments. In this paper, we propose a multi-objective NSGA-II wideband beamforming method based on a spherical harmonic domain for spherical microphone arrays topology. The method takes white noise gain, directional index and maximum sidelobe level as the optimization objectives of broadband beamforming, adopts the NSGA-II optimization strategy with constraints to estimate the Pareto optimal solution, and provides three-dimensional broadband beamforming capabi

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17

Konduri, Raja Rajeswari, Nagireddi Roopavathi, Balantrapu Vijaya Lakshmi, and Putrevu Venkata Krishna Chaitanya. "Mitigating Peak Sidelobe Levels in Pulse Compression Radar using Artificial Neural Networks." Indian Journal of Artificial Intelligence and Neural Networking 3, no. 6 (2024): 12–20. http://dx.doi.org/10.54105/ijainn.f9517.03061023.

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In this paper, Artificial Neural Networks (ANNs) are being considered to obtain low sidelobe pattern for binary codes and thereby to improve the performance of pulse compression radar. Pulse compression is a popular technique used for improving range resolution in the radar systems. This paper proposes a new approach for Pulse Compression using various types of ANN networks like Multi-Layer Perception (MLP), Recursive Neural Networks (RNN), Radial Basis Function (RBF) and Recurrent Radial Basis Function (RRBF) and a special class of Feed-Forward Wavelet Neural Network (WNN) with one input laye

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Raja, Rajeswari Konduri. "Mitigating Peak Sidelobe Levels in Pulse Compression Radar using Artificial Neural Networks." Indian Journal of Artificial Intelligence and Neural Networking (IJAINN) 3, no. 6 (2024): 12–20. https://doi.org/10.54105/ijainn.F9517.03061023.

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<strong>Abstract:</strong> In this paper, Artificial Neural Networks (ANNs) are being considered to obtain low sidelobe pattern for binary codes and thereby to improve the performance of pulse compression radar. Pulse compression is a popular technique used for improving range resolution in the radar systems. This paper proposes a new approach for Pulse Compression using various types of ANN networks like Multi-Layer Perception (MLP), Recursive Neural Networks (RNN), Radial Basis Function (RBF) and Recurrent Radial Basis Function (RRBF) and a special class of Feed-Forward Wavelet Neural Networ

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Pertiwi, Novalia, Fannush Shofi Akbar, Eko Setijadi, and Gamantyo Hendrantoro. "Linear Array Thinning with Cavity backed U-slot Patch Antenna using Genetic Algorithm." Journal of Science and Applicative Technology 5, no. 1 (2021): 9. http://dx.doi.org/10.35472/jsat.v5i1.386.

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In this paper, a thinned linear array with Cavity backed U-slot Patch has been investigated using the Genetic Algorithm to minimize peak sidelobe level and the number of antenna elements. One of the essential steps in the Genetic Algorithm method is a crossover, which uses the Paired Top Ten and Combined Top Five rules applied to the Cavity backed U-slot Patch antenna. The peak sidelobe level value is -18.63 dB with a array filling of 63.33% at the broadside angle using Combined Top Five rules. In Paired Top Ten, the peak sidelobe level value is -19.48 dB with a array filling of 70%. The two m

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Khan, Zafar-Ullah, Aqdas Naveed Malik, Fawad Zaman, Syed Azmat Hussain, and Abdul-Rehman Khan. "Sidelobe Suppression with Null Steering by Independent Weight Control." International Journal of Antennas and Propagation 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/136826.

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A uniform linear array ofnantenna elements can steer up ton-1nulls. In situations where less thann-1nulls are required to be steered, the existing algorithms have no criterion to utilize the remaining weights for sidelobe suppression. This work combines sidelobe suppression capability with null steering by independent weight control. For this purpose, the array factor is transformed as the product of two polynomials. One of the polynomials is used for null steering by independent weight control, while the second one is for sidelobe suppression whose coefficients or weights are determined by us

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De Maio, Antonio, Marco Piezzo, Salvatore Iommelli, and Alfonso Farina. "Design of Pareto-Optimal Radar Receive Filters." International Journal of Electronics and Telecommunications 57, no. 4 (2011): 477–81. http://dx.doi.org/10.2478/v10177-011-0067-y.

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Design of Pareto-Optimal Radar Receive Filters This paper deals with the design of radar receive filters jointly optimized with respect to sidelobe energy and sidelobe peaks via Pareto-optimal theory. We prove that this criterion is tantamount to jointly minimizing two quadratic forms, so that the design can be analytically formulated in terms of a multi-objective optimization problem. In order to solve it, we resort to the scalarization technique, which reduces the vectorial problem into a scalar one using a Pareto weight defining the relative importance of the two objective functions. At the

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Andersen, Øivind. "A sidelong glance." Asiatische Studien - Études Asiatiques 68, no. 4 (2014): 915–23. http://dx.doi.org/10.1515/asia-2014-0049.

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Lin, Hsiu-Hsien, Paul Scholz, Cherry Ng, et al. "Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Sidelobe FRBs." Astrophysical Journal 975, no. 1 (2024): 75. http://dx.doi.org/10.3847/1538-4357/ad779d.

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Abstract We report 10 fast radio bursts (FRBs) detected in the far sidelobe region (i.e., ≥5° off-meridian) of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) from August 28 2018 to August 31 2021. We localize the bursts by fitting their spectra with a model of the CHIME/FRB synthesized beam response. We find that the far sidelobe events have on average ∼500 times greater fluxes than events detected in CHIME’s main lobe. We show that the sidelobe sample is therefore statistically ∼20 times closer than the main lobe sample. We find promising host galaxy candidates (P cc < 1%) for

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Alejos, Ana Vazquez, Muhammad Dawood, and Habeeb Ur-Rahman Mohammed. "Estimation of Sidelobe Level Variations of Phased Codes in Presence of Random Interference for Bistatic Wideband Noise Radar." International Journal of Antennas and Propagation 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/297823.

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We discuss the importance of using the sidelobe level of the cross-correlation function as a criterion to implement a noise radar based on the transmission of wideband binary waveforms. Theoretical expressions are introduced for the parameters Peak-Sidelobe, Secondary-Sidelobe, and Integrated-Sidelobe levels for both Golay and pseudorandom binary sequences in presence of additive white Gaussian noise, relating the sequence lengthMto the spectral powerN0of the interfering noise. These expressions offer a valuable method for adaptive radar waveform design in order to determine sequence requireme

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Liu, Xuchen, Yongjun Liu, Guisheng Liao, Hao Tang, Heming Wang, and Xiaoyang Dong. "Robust Low-Sidelobe MIMO Dual-Function Radar–Communication Waveform Design." Remote Sensing 17, no. 7 (2025): 1242. https://doi.org/10.3390/rs17071242.

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In multi-input–multi-output (MIMO) dual-function radar–communication (DFRC) systems, the inevitable amplitude–phase errors increase the sidelobe of transmit beampattern and distort the synthesized waveforms, which degrades both radar and communication performance. Due to this, a robust low-sidelobe MIMO DFRC waveform design method is proposed. Firstly, a DFRC transmit signal model based on the uncertainty sets of amplitude–phase errors is established. The robust low-sidelobe MIMO DFRC waveform design problem is then formulated. In this problem, the sidelobe of transmit beampattern is minimized

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Vizitiu, Iulian-Constantin. "Sidelobe Reduction in the Pulse-Compression Radar Using Synthesis of NLFM Laws." International Journal of Antennas and Propagation 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/605604.

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It is well known that in the pulse-compression radar theory, the sidelobe reduction using synthesis of some proper nonlinear FM (NLFM) laws represents a major research direction. In order to assure the sidelobe suppression, the main objective of this paper is to present an adequate synthesis algorithm of NLFM signals based on stationary phase principle. The achieved experimental results confirm a significant sidelobe reduction (i.e., more than −40 dB) without necessity to apply some weighting techniques. In addition, the analysis of the synthesized NLFM laws by ambiguity function tool is also

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Guan, Chengyu, Zemin Zhou, and Xinwu Zeng. "A Phase-Coded Sequence Design Method for Active Sonar." Sensors 20, no. 17 (2020): 4659. http://dx.doi.org/10.3390/s20174659.

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Phase-coded sequences are widely studied as the transmitted signals of active sonars. Recently, several design methods have been developed to generate phased-coded sequences satisfying specific aperiodic or periodic autocorrelation sidelobe level metrics. In this paper, based on the majorization–minimization strategy and the squared iterative acceleration scheme, we propose a method to generate sequences with the periodic weighted integrated sidelobe level metric. Numerical simulations illustrate that the proposed method can effectively suppress the periodic autocorrelation sidelobe levels in

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Rahaman, Imteaz, Md Ashraful Haque, Narinderjit Singh Sawaran Singh, et al. "Performance Analysis of Linearly Arranged Concentric Circular Antenna Array with Low Sidelobe Level and Beamwidth Using Robust Tapering Technique." Micromachines 13, no. 11 (2022): 1959. http://dx.doi.org/10.3390/mi13111959.

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In this research, a novel antenna array named Linearly arranged Concentric Circular Antenna Array (LCCAA) is proposed, concerning lower beamwidth, lower sidelobe level, sharp ability to detect false signals, and impressive SINR performance. The performance of the proposed LCCAA beamformer is compared with geometrically identical existing beamformers using the conventional technique where the LCCAA beamformer shows the lowest beamwidth and sidelobe level (SLL) of 12.50° and −15.17 dB with equal elements accordingly. However, the performance is degraded due to look direction error, for which rob

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Zhao, Ke, Lizhe Liu, and Lirong Mei. "Investigation of Multibeam Forming Algorithm for Cylindrical Conformal Array Antenna." International Journal of Antennas and Propagation 2022 (March 29, 2022): 1–9. http://dx.doi.org/10.1155/2022/5379071.

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A multibeam forming algorithm based on cylindrical conformal array antenna is proposed in this paper. A comprehensively optimized algorithm of Taylor weights is used to reduce sidelobes. Multiple beams pointed at different azimuth angles are formed based on a reconfigurable overlapping array division method of subarrays, therefore each beam can get the maximum excitation of subarrays and ensure the pointing accuracy of the main lobe. Finally the cylindrical array antenna realizes the multibeam scanning and area coverage. The experimental results show that the sidelobe level after comprehensive

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Ali, Weaam Talaat. "Detraction the Clutter for the Best Binary Phase Codes that Begot By Genetic Algorithm Using Wiener Filter." European Journal of Engineering and Technology Research 1, no. 1 (2018): 9–14. http://dx.doi.org/10.24018/ejeng.2016.1.1.59.

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This work illustrates the performance of detraction of clutter (unwanted echo signals, which mask the desired target signal and make difficult to detect the target) as a result of binary codes generating by genetic algorithm with length up to 105 bits, with use the minimum peak sidelobes as criteria for generation codes. Then, for further reduction of sidelobes, the mismatched optimum integrated sidelobe level filter (Wiener filter) is used with and without White Gaussian Noise. When the mismatched filter is used without noise, then the reduction of sidelobe level has the improvement of peak s

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Ward, J., and R. T. Compton. "Sidelobe level performance of adaptive sidelobe canceller arrays with element reuse." IEEE Transactions on Antennas and Propagation 38, no. 10 (1990): 1684–93. http://dx.doi.org/10.1109/8.59783.

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Zhongxiang, Zhang, Fan Chenghua, Zhang Liang, and Kong Meng. "A 24×24 Microstrip Array Antenna at K-band." Open Electrical & Electronic Engineering Journal 9, no. 1 (2015): 179–84. http://dx.doi.org/10.2174/1874129001509010179.

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A 24×24 microstrip array antenna for Doppler radar is presented. For the low sidelobe, the feeding network of microstrip array antenna is used Taylor series amplitude weighting. The sidelobe of microstrip array antenna is less than - 18.5 dB at 24.15GHz. The proposal design is confirmed by both simulation and measured results.

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Xia, Meng, Wenrong Gong, and Lichao Yang. "A Novel Waveform Optimization Method for Orthogonal-Frequency Multiple-Input Multiple-Output Radar Based on Dual-Channel Neural Networks." Sensors 24, no. 17 (2024): 5471. http://dx.doi.org/10.3390/s24175471.

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The orthogonal frequency-division multiplexing (OFDM) mode with a linear frequency modulation (LFM) signal as the baseband waveform has been widely studied and applied in multiple-input multiple-output (MIMO) radar systems. However, its high sidelobe levels after pulse compression affect the target detection of radar systems. For this paper, theoretical analysis was performed, to investigate the causes of high sidelobe levels in OFDM-LFM waveforms, and a novel waveform optimization design method based on deep neural networks is proposed. This method utilizes the classic ResNeXt network to cons

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Elahi, Atif, Ijaz Mansoor Qureshi, Fawad Zaman, Noor Gul, and Tahir Saleem. "Suppression of Mutual Interference in Noncontiguous Orthogonal Frequency Division Multiplexing Based Cognitive Radio Systems." Wireless Communications and Mobile Computing 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/1860134.

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Orthogonal frequency division multiplexing (OFDM) is a favourable technology for dynamic spectrum access (DSA) due to the flexibility in spectrum shaping. In spite of that, high sidelobes of OFDM subcarriers bring in considerable interference to the nearby users, particularly in OFDM based cognitive radio (CR) networks, where the secondary users (SUs) are capable of accessing the spectrum opportunistically. In this paper, two new techniques for the suppression of high sidelobes are proposed. The proposed techniques composed of an optimization scheme are followed by generalized sidelobe cancell

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Maier, Eva-Maria, Leonie Maria Tanczer, and Lukas Daniel Klausner. "Surveillance Disguised as Protection: A Comparative Analysis of Sideloaded and In-Store Parental Control Apps." Proceedings on Privacy Enhancing Technologies 2025, no. 2 (2025): 107–24. https://doi.org/10.56553/popets-2025-0052.

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Parental control applications, software tools designed to manage and monitor children’s online activities, serve as essential safeguards for parents in the digital age. However, their usage has sparked concerns about security and privacy violations inherent in various child monitoring products. Sideloaded software (i.e. apps installed outside official app stores) poses an increased risk, as it is not bound by the regulations of trusted platforms. Despite this, the market of sideloaded parental control software has remained widely unexplored by the research community. This paper examines 20 sid

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LIVINGSTON, ELLEN S., and HENRIK SCHMIDT. "A COMPARISON OF THE CONVENTIONAL, THE MINIMUM VARIANCE, AND THE MULTIPLE CONSTRAINT MATCHED FIELD PROCESSORS." Journal of Computational Acoustics 02, no. 03 (1994): 217–29. http://dx.doi.org/10.1142/s0218396x94000154.

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The multiple constraint processor (MCM) is known to be tolerant of water column mismatch while retaining sidelobe control. In this paper, the simulated test cases from the Spring 1993 MFP workshop, which additionally incorporate sediment parameter and bottom depth mismatch, are used to compare the conventional (Bartlett), the minimum variance (MV), and the MCM processors. Peak levels, range and depth estimates, and peak-to-high-sidelobe results are presented. The MCM is shown to maintain sidelobe suppression and correct source localization in all cases at 40 and 10 dB SNR, even when the other

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Xi, Ya Ming, Rong Jiu Huang, Yan Jing Han, and Qing Zhang. "A Novel Method for Pulse Integration in Radar-Probing System." Advanced Materials Research 529 (June 2012): 23–28. http://dx.doi.org/10.4028/www.scientific.net/amr.529.23.

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In this paper, a novel method for pulse integration in radar-probing system is proposed to yield a low sidelobe response. According to m-sequence widely used in spread spectrum communication system, a bipolar pulse sequence is designed in this paper. At the receiving end, the envelop-detected signal is processed by a corresponding algorithm which dilutes the range sidelobe influence much. Because of the good autocorrelation and cross-correlation properties, waveforms yield a low sidelobe response and major lobe to side lobe ratio can reach 30dB or more, which is easy to satisfy the practical r

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Afacan, Erkan. "Location Optimization for Square Array Antennas Using Differential Evolution Algorithm." International Journal of Antennas and Propagation 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/1956047.

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In recent works thinned arrays giving minimum peak sidelobe levels for planar square antenna arrays are obtained using Hadamard difference sets. In the current work thinned array configurations giving lower peak sidelobe levels than those given in the literature are obtained for square arrays of6×6,8×8,12×12, and16×16elements. Differential evolution algorithm is used in the determination of the antenna locations.

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Schrank, H. "Low sidelobe reflector antennas." IEEE Antennas and Propagation Society Newsletter 27, no. 2 (1985): 5–16. http://dx.doi.org/10.1109/map.1985.27798.

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Li, Hongtao, Zhoupeng Ding, Sirui Tian, and Songpo Jin. "Robust Adaptive Transmit Beamforming under the Constraint of Low Peak-to-Average Ratio." Sensors 22, no. 19 (2022): 7278. http://dx.doi.org/10.3390/s22197278.

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In radar detection, in order to make the beam have variable directivity, a Capon beamformer is usually used. Although this traditional beamformer enjoys both high resolution and good interference suppression, it usually leads to high sidelobe and is sensitive to array steering vector (ASV) mismatch. To overcome such problems, this study devises a novel, robust adaptive beamformer that is robust to ASV mismatch under the constraint where the sidelobe is oriented to the ground. Moreover, to make full use of the transmit power, the constraint of a low peak-to-average power ratio (PAPR) is also ta

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Albagory, Yasser, and Fahad Alraddady. "An Efficient Adaptive and Steep-Convergent Sidelobes Simultaneous Reduction Algorithm for Massive Linear Arrays." Electronics 11, no. 2 (2022): 170. http://dx.doi.org/10.3390/electronics11020170.

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Antenna arrays have become an essential part of most wireless communications systems. In this paper, the unwanted sidelobes in the symmetric linear array power pattern are reduced efficiently by utilizing a faster simultaneous sidelobes processing algorithm, which generates nulling sub-beams that are adapted to control and maintain steep convergence toward lower sidelobe levels. The proposed algorithm is performed using adaptive damping and heuristic factors which result in learning curve perturbations during the first few loops of the reduction process and is followed by a very steep converge

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Yang, Shuo, Lijun Zhang, Jun Fu, Zhanqi Zheng, Xiaobin Zhang, and Anmou Liao. "Design and Optimization for 77 GHz Series-Fed Patch Array Antenna Based on Genetic Algorithm." Sensors 20, no. 11 (2020): 3066. http://dx.doi.org/10.3390/s20113066.

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This paper proposes a method for designing a 77 GHz series-fed patch array antenna. Based on the traditional genetic algorithm, the study explores different array topologies consisting of the same microstrip patches to optimize the design. The main optimization goal is to reduce the maximum sidelobe level (SLL). A 77 GHz series-fed patch array antenna for automotive radar was simulated, fabricated, and measured by employing this method. The antenna length was limited to no longer than 3 cm, and the array only had a single compact series with the radiation patch about 1.54 mm wide. In the genet

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Mohammed, Jafar Ramadhan, and Dalia Ahmad Al-Khafaf. "Optimizing Performance of Antenna Arrays with Clustered Fractal Shapes for Multiband Applications." Journal of Telecommunications and Information Technology, no. 1 (March 8, 2024): 91–96. http://dx.doi.org/10.26636/jtit.2024.1.1456.

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Fractal antennas are mainly used in multiband applications. However, these types of arrays suffer from numerous disadvantages, such as high sidelobe levels, low directivity, poor taper efficiency, and high design computational complexity. In this paper, the conventional fractal procedures are redesigned and efficient clustered subarrays are deployed, such that their multiband properties are maintained while simultaneously achieving significant improvements in radiation characteristics. A genetic optimization algorithm is used to find the optimal clustered fractal shapes and their associated am

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Grigoriev, E. "Study of Correlation Properties of New Code Sequences Based on Persymmetric Quasi-Orthogonal Circulants." Proceedings of Telecommunication Universities 8, no. 2 (2022): 83–90. http://dx.doi.org/10.31854/1813-324x-2022-8-2-83-90.

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For radar and communication systems, the search for code sequences with good correlation properties remains one of important tasks. This work shows the results of the study of aperiodic autocorrelation functions of new code sequences based on persymmetric quasi-orthogonal circulants. The numerical values of the quality parameters such as: the maximum sidelobe level, integrated sidelobe level ratio, and merit factor are given. Applying new code sequences makes it possible to reduce the maximum sidelobe level of the aperiodic autocorrelation function, as well as to reduce the summary energy of t

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Zhang, Xiaojun, and Zishu He. "The MIMO Radar Transmit Beampattern Matching Design with Sidelobe Suppression." Electronics 11, no. 22 (2022): 3650. http://dx.doi.org/10.3390/electronics11223650.

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In this paper, a novel method termed the cosine approach is proposed to address the sidelobe suppression problem in MIMO radar transmit beampattern matching design. In contrast to the traditional optimization algorithms that try to find the optimum solutions from feasible regions, the proposed method, starting from outside the feasible regions, aims to obtain a satisfactory solution from a series of optimal transmit beampatterns. We first standardized the sidelobe suppression problem in MIMO radar transmit beampattern matching design and put forward four criteria to guide the micro-adjustment

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Asmaa, Rady, Shokair Mona, M. El-Rabaie EL-Sayed, and ElKorany Ahmed. "A HYBRID PRECODING TECHNIQUE FOR REDUCING BOTH PAPR AND SIDELOBE POWER IN COGNITIVE RADIO NETWORKS." Circuits and Systems: An International Journal (CSIJ) 1, July (2019): 1–10. https://doi.org/10.5281/zenodo.3356202.

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ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) is a recognized transmission technique for Cognitive Radio (CR) networks, which is called non-contiguous OFDM (NC-OFDM). While this technique has two major drawbacks, Out OF Band (OOB) leakage due to high spectral sidelobe and high Peak to Average Power Ratio (PAPR), which cause interference with Primary Users (PU). Many solutions were proposed for solving either of these problems individually or together. In this paper, a hybrid precoding technique for reducing both PAPR and sidelobe power is proposed. This technique is based on using

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Jang, Moon-Kyeong, Seok-Joon Hwang, Chang-Seop Shin, and Ju-Seok Nam. "A Novel Approach to Determine Static Falling down Sidelong Angle of Tractor Using a 3D Printed Miniature Model." Applied Sciences 12, no. 1 (2021): 43. http://dx.doi.org/10.3390/app12010043.

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In this study, we have conducted a quasi-static lateral overturning test and derived a static falling down sidelong angle by using a miniature tractor model. We analyzed the lateral overturning condition of tractors theoretically by literature review and derived a method to manufacture a miniature model based on the analysis result. A miniature model was manufactured using a 3D printer at a scale of 1/20, relative to the actual dimension of a tractor. In addition, a test platform was constructed to perform lateral overturning tests. The miniature model was placed on the test platform, and the

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Li, Meng-Lin, Sheng-Wen Huang, Kutay Üstüner, and Pai-Chi Li. "Adaptive Imaging Using an Optimal Receive Aperture Size." Ultrasonic Imaging 27, no. 2 (2005): 111–27. http://dx.doi.org/10.1177/016173460502700205.

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Sidelobe contribution from off-axis targets degrades image quality in a coherent array imaging system. In ultrasound imaging, focusing errors resulting from sound-velocity inhomogeneities in human tissue — also known as phase aberrations — reduce the coherence of the received signals and elevate the sidelobe level. This paper proposes an adaptive receive-aperture technique based on thresholding of the coherence factor (CF). The CF describes the coherence of the received array signals and can be used as an index of focusing quality. This paper demonstrates that thresholding of the CF allows the

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Hu, Hongming, Huawang Li, Guang Liang, Lulu Zhao, Jiashuo Yang, and Xiaoli Wei. "Phase-Only Pattern Synthesis for Spaceborne Array Antenna Based on Improved Mayfly Optimization Algorithm." Electronics 12, no. 4 (2023): 895. http://dx.doi.org/10.3390/electronics12040895.

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A new optimization algorithm—Improved Mayfly Optimization Algorithm (IMOA)—is proposed in this paper to fulfill the low sidelobe level (SLL) design requirements of the spaceborne array antenna. MOA is a new heuristic algorithm inspired by the flying behavior and mating process of mayflies. It has a unique speed updating system with great convergence, strong stability, fast solution speed, and high precision. Based on the MOA, IMOA not only introduces the adaptive inertial weight factor to enhance the search ability, but also uses the Levy flight strategy and the golden sine operator to improve

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Dai, Yan, Chao Sun, and Xionghou Liu. "On the 2D Beampattern Optimization of Sparse Group-Constrained Robust Capon Beamforming with Conformal Arrays." Remote Sensing 16, no. 2 (2024): 421. http://dx.doi.org/10.3390/rs16020421.

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To overcome the problems of the high sidelobe levels and low computational efficiency of traditional Capon-based beamformers in optimizing the two-dimensional (elevation–azimuth) beampatterns of conformal arrays, in this paper, we propose a robust Capon beamforming method with sparse group constraints that is solved using the alternating-direction method of multipliers (ADMM). A robustness constraint based on worst-case performance optimization (WCPO) is imposed on the standard Capon beamformer (SCB) and then the sparse group constraints are applied to reduce the sidelobe level. The constraint

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