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On time-invariant FDA beam-pattern design based on time-dependent frequency offsets

On time-invariant FDA beam-pattern design based on time-depe...

引用

sensor array and multichannel signal processing workshop

作者： Jiantao Shi Nanjing Research Institute of Electronic Technology Nanjing China

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

In the existing works on FDA beam-patterns produced by the traditional FDA are time variant, and this causes difficulties in target detecting and beam-pattern steering. For solving the problem, several time-dependent frequency offsets based time-invariant FDA beam-pattern design methods have been proposed, which, however, neglected the time-range relationship and led to erroneous conclusions. In this note, considering the practical constraint and the relationship between time and range, it is concluded that FDA beam-patterns are always time-variant and it is unable to form time-invariant beam-patterns.

关键词： Time-frequency analysis array signal processing Simulation Design methodology Conferences Frequency diversity sensor arrays

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Precoding for RadComm Systems Based on Hybrid Antenna arrays

Precoding for RadComm Systems Based on Hybrid Antenna Arrays

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sensor array and multichannel signal processing workshop

作者： Freddy Y.P. Feng Lei Huang School of Information Engineering Shenzhen University Shenzhen China

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

Integrated wireless communications and radar detections have so far mainly relied on phased-array (PA) antennas with only considering the beampatterns in angle domain. By applying the frequency diverse array (FDA) into radar and communications (RadComm) systems, a compact dual-functional structure of joint PA and FDA is designed. Based on the built joint PA and FDA channel models, different beamformer designs are proposed by jointly optimizing the signal-to-interference-noises of the communications and radar. Numerical simulations demonstrate the performances of both communications and the radar with the proposed approaches are over than that of the conventional PA RadComm systems.

关键词： Wireless communication array signal processing Radar detection Radar Interference Radar antennas Numerical simulation

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On the DOA Estimation Performance of Optimum arrays Based on Deep Learning

On the DOA Estimation Performance of Optimum Arrays Based on...

引用

sensor array and multichannel signal processing workshop

作者： Steven WANDALE Koichi ICHIGE Department of Electrical and Computer Engineering Yokohama National University Yokohama Japan

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

In this paper, we investigate the optimality of deep learning-based optimal sparse arrays in comparison to well known conventional sparse linear arrays. Deep learning-based sparse arrays are realized through a deep learning-based approach which was proposed recently for antenna selection purposes as a measure towards reducing high hardware and computational cost in radar systems. Through numerical examples, we demonstrated that the proposed approach yields sparse arrays whose performance and configurations are comparably closer to conventional sparse arrays.

关键词： Antenna measurements array signal processing Radar measurements Estimation Radar Radar antennas Hardware

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A Variational Bayesian Approach to Direction Finding of Correlated Targets Using Coprime array

A Variational Bayesian Approach to Direction Finding of Corr...

引用

sensor array and multichannel signal processing workshop

作者： Jie Yang Yixin Yang School of Marine Science and Technology Northwestern Polytechnical University Xi’an Shaanxi China

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

In this paper, we develop a sparsity-aware algorithm for direction-of-arrival (DOA) estimation of correlated targets in the context of coprime array processing. The idea is to iteratively interpolate the observed data to a virtual nonuniform linear array (NLA) in order to raise the degrees of freedom (DOF). We derive the estimation procedures using variational inference for fully Bayesian estimation, where the current parameter estimates are used to interpolate the observed data better and thus increase the likelihood of the next parameter estimates. The novelties of our method lies in its capacity of detecting more correlated sources than the number of physical sensors. Simulated data from coprime arrays are used to illustrate the superior performance of the proposed approach as compared with other state-of-the-art compressed sensing reconstruction algorithms.

关键词： Direction-of-arrival estimation array signal processing Computational modeling Simulation Estimation signal processing algorithms Inference algorithms

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Moving target detection of array antennas based on time reversal

Moving target detection of array antennas based on time reve...

引用

sensor array and multichannel signal processing workshop

作者： Zhaoming Zhang Baixiao Chen Minglei Yang Hui Xu National Laboratory of Radar Signal Processing Xidian University Xi’an China School of Electronic Engineering Xidian University Xi’an China

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

This paper develops a time reversal moving target detector based on array antennas. Time reversal utilizes the multipath effect by retransmitting the received signal containing the Doppler shift of the moving target. Two detectors are derived in both conventional and time reversal scenarios, respectively. The Monte Carlo results show that the time reversal detector significantly improves the target detection probability in multi-path environments compared with the conventional detector. The increase of multipath number is helpful to improve the detection probability of time reversal detector.

关键词： Doppler shift Monte Carlo methods Conferences Focusing Detectors Object detection Multipath channels

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A Note on The Maximum Number of Sources in DOA Estimation by MODE

A Note on The Maximum Number of Sources in DOA Estimation by...

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sensor array and multichannel signal processing workshop

作者： Shohei Hamada Koichi Ichige Department of Electrical and Computer Engineering Yokohama National University Yokohama Japan

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

This paper discusses the maximum number of sources when their direction of arrivals (DOAs) are estimated by the method of direction estimation (MODE), and presents a modified version of MODE that can estimate more number of sources than that by the original MODE. It is well-known that M-element array can basically estimate up to (M – 1) DOAs, however the application of MODE may reduce up to M/2 DOAs because of its computation procedure . We propose a novel DOA estimation method by modifying MODE to employ peak-search of the primary eigenvector beam patterns instead of the null-search in the original MODE. Performance of the proposed method is evaluated through computer simulation.

关键词： Direction-of-arrival estimation array signal processing Conferences Computer simulation Estimation Eigenvalues and eigenfunctions sensor arrays

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Direction of Arrival Estimation of Non-circular signals using Modified Nested array

Direction of Arrival Estimation of Non-circular Signals usin...

引用

sensor array and multichannel signal processing workshop

作者： Xiaofei Zhang Yunfei Wang Wang Zheng College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

In this paper, we investigate the issue of direction of arrival (DOA) estimation of non-circular (NC) signals, and propose a modified nested array with enhanced degrees of freedom (DOFs) and a vectorized NC propagator method (VNCPM) algorithm which can utilize the difference-sum co-array to perform DOA estimation. Specifically, we modify the conventional nested array by switching the positions of the two subarrays aiming to obtain a difference-sum co-array with higher DOFs. In order to fully exploit the provided DOFs and obtain higher estimation accuracy, we utilize the NC characteristic to generate the equivalent received signal of the difference-sum co-array and exploit the quasi-stationary property of the signal to avoid the spatial smoothing technique which leads to the DOF degradation. The modified PM based on the rotational invariance is then employed to obtain DOA estimates, where NC phases can be eliminated. Simulations are provided to evaluate the superiority of the proposed configuration and DOA estimation algorithm.

关键词： Degradation Direction-of-arrival estimation Smoothing methods array signal processing Conferences Estimation signal processing algorithms

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An Anti-jamming Method Against Frequency Diverse array for ISAR by Spatial Location Feature Recognition

An Anti-jamming Method Against Frequency Diverse Array for I...

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sensor array and multichannel signal processing workshop

作者： Zhidong Liu Kaiming Li Ying Luo Qun Zhang Qingzhu Huang Institute of Information and Navigation Air Force Enginnering University Xi’an China Unit 94608 of PLA Nanjing China

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

By means of frequency-shifting jamming processing of target echo signal and pulse compression in imaging processing, group of false targets will appear in different spatial locations around the true target. The feature extraction of false targets is complex and limited in existing countering methods. In this paper, an anti-jamming method against frequency diverse array (FDA) is proposed to identify the spatial location characteristics of the deception false targets. By adjusting the parameters of the radar transmitting signal, the method simultaneously transmits the anti-jamming signal and carries out the false target identification and elimination in the range dimension. Eventually, the optimal signal parameter design of anti-jamming signal is given by comparing with the range resolution. The validity of the proposed method is proved by deducing the mathematical model between the spatial distribution characteristics of the false targets and the radar transmitting signal parameters and demonstrated by simulations.

关键词： Target recognition array signal processing Radar Radar imaging Frequency diversity Radar countermeasures Mathematical model

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Efficient Design of Doppler Sensitive Long Discrete-Phase Periodic Sequence Sets for Automotive Radars

Efficient Design of Doppler Sensitive Long Discrete-Phase Pe...

引用

sensor array and multichannel signal processing workshop

作者： Wenjie Huang Ronghao Lin University of Science and Technology of China

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

We present an efficient method to design long discrete-phase periodic sequence sets with good auto- and cross-ambiguity function properties in the presence of Doppler shifts. Our goal is to minimize the integrated sidelobe level within a desired time-delay and Doppler-shift region of the ambiguity function related metric. A coordinate descent (CD) framework, with efficient updating procedures within the CD iterations, is introduced to achieve low computational complexities. We use numerical examples to demonstrate that we can design long sequence sets with good ambiguity function properties.

关键词： Measurement Doppler shift array signal processing Design methodology Conferences Doppler radar Computational complexity

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Hybrid Transceiver Design for Dual-Functional Radar-Communication System

Hybrid Transceiver Design for Dual-Functional Radar-Communic...

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sensor array and multichannel signal processing workshop

作者： Ziyang Cheng Bin Liao Zishu He School of Information and Communication Engineering UESTC Chengdu China The Guangdong Key Laboratory of Intelligent Information Processing Shenzhen University Shenzhen China

ISBN: (数字)9781728119465

ISBN: (纸本)9781728119472

This paper investigates the problem of hybrid transceiver design for dual-functional radar-communication (DFRC) system. Specifically, we introduce an information embedding scheme for the DFRC system with a subarray structure. The hybrid transmit/receive beamformers are designed by maximizing sum-rate under constraints of power and similarity between the designed bemaformer and the reference one with good beampattern property. Since the formulated problem is difficult to tackle, we propose an alternating optimization method based on the alternating direction method of multipliers (ADMM) framework to obtain the hybrid beamformer. Numerical simulations are provided to demonstrate the effectiveness of the proposed schemes.

关键词： array signal processing Simulation signal processing algorithms Optimization methods Radar Numerical simulation Convex functions

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