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An Anti-jamming Method of ISAR Imaging with FDA-MIMO Radar 10

An Anti-jamming Method of ISAR Imaging with FDA-MIMO Radar

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10th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Li, Guangming Zhang, Qun Luo, Ying Li, Kaiming Su, Linghua Li, Rui Air Force Engn Univ Grad Coll Xian Shaanxi Peoples R China Air Force Engn Univ Informat & Nav Coll Xian Shaanxi Peoples R China

ISBN: (纸本)9781538647523

In recent years, the frequency diverse array (FDA) radar has attracted much attention due to its range-angle dependent beam-pattern. And multiple input multiple output (MIMO) radar has been widely investigated with the advantage of transmit waveform diversity. In this paper, a FDA-MIMO Inverse Synthetic Aperture Radar (ISAR) is proposed to achieve anti-jamming of ISAR imaging. LFM (Linear Frequency Modulated) and SFCS (Stepped-Frequency Chirp signal) signals are transmitted to jammer and targets respectively, and the received signals are matched filtering by the signal transmitted to the targets. So the jamming signal can't matched with the reference signal, the well anti-jamming effect can be obtained. The performance of the proposed method is evaluated by the simulation results.

关键词： Frequency diverse array multiple input multiple output inverse synthetic aperture radar anti-jamming

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Design of 2-dimension sparse arrays using an improved genetic algorithm

Design of 2-dimension sparse arrays using an improved geneti...

引用

4th ieee sensor array and multichannel signal processing workshop

作者： Chen, Kesong He, Zishu Han, Chunlin Univ Elect Sci & Technol China Sch Elect Engn Chengdu Dichuan Peoples R China

ISBN: (纸本)1424403081

For the element position synthesis of 2-dimension sparse rectangular arrays with the design constraints of the number of elements, the aperture and the minimum element spacing, an improved genetic algorithm (IGA) based on chromosome element resetting is presented in this paper. Compared with the synthesis method of thinned arrays, this new approach could exploit more degree of freedom of elements to control the characters of the sparse arrays. When the aperture, the number of elements and the minimum element spacing are fixed identical, the new approach can make the sparse plane array produce lower peak sidelobe level (PSLL). The simulated results show that the fitness function value of thinned plane arrays with 108 elements mentioned by Haupt can reduce 5.626dB when the minimum element spacing of half wavelength was introduced into the optimization. And as well, the great efficiency and the robustness of IGA are shown in this paper.

关键词： array processing

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Improved 2-D Root MUSIC for non-circular signals

Improved 2-D Root MUSIC for non-circular signals

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4th ieee sensor array and multichannel signal processing workshop

作者： Salameh, Amjad Tayem, Nizar Kwon, Hyuck M. Florida Atlantic Univ Dept Elect Engn Boca Raton FL 33431 USA W Virginia Univ Inst Technol Dept Elect Engn Montgomery AL 25136 USA Wichita State Univ Dept ECE Wichita KS 67260 USA

ISBN: (纸本)1424403081

This paper proposes an improved two-dimensional (2-D) Root MUSIC algorithm for non-circular sources. The proposed method has many advantages over conventional Root MUSIC algorithms. First, it requires no pair matching between the azimuth and elevation angle estimation, whereas conventional 2-D Root MUSIC algorithms require an exhaustive pair-matching search. Second, the proposed algorithm shows no estimation failure when the elevation angles are between 70 and 90 degrees, whereas the conventional 2-D Root MUSIC algorithms fail. Third, the proposed algorithm can estimate the direction of arrival angles (DOAs) of coherent sources, whereas the conventional 2-D Root MUSIC algorithms cannot. Fourth, the algorithm does not require any forward/backward spatial smoothing, whereas the conventional 2-D MUSIC algorithms do. Hence, the proposed algorithm can reduce the computational load significantly and can be applied to faster real-time radar/sonar and commercial wireless systems. In addition to these advantages, the simulation results show that the proposed algorithm outperforms the conventional Root MUSIC algorithms by a 7 dB gain in signal-to-noise ratio (SNR) to achieve the same root mean square error (RMSE) performance.

关键词： antenna arrays array signal processing Root MUSIC coherent sources Toeplitz

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sensor scheduling using a 0-1 mixed integer programming framework

Sensor scheduling using a 0-1 mixed integer programming fram...

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4th ieee sensor array and multichannel signal processing workshop

作者： Chhetri, Amit S. Morrell, Darryl Papandreou-Suppappola, Antonia Arizona State Univ Dept Elect Engn Tempe AZ 85281 USA Arizona State Univ Dept Engn Tempe AZ 85281 USA

ISBN: (纸本)1424403081

In this paper, we propose a novel myopic sensor scheduling methodology for tracking a target moving through a network of energy-constrained acoustic sensors. Specifically, we address the problem of activating the minimum-energy combination of sensors in a network that maintains a desired squared-error accuracy in the target's position estimate. We first formulate the scheduling problem as a binary (0-1) nonlinear programming (NLP) problem. Using a linearization technique, we then convert the 0-1 NLP problem into a 0-1 mixed integer programming (MIP) problem. We solve the reformulated 01 MIP problem using a linear programming relaxation based branch-and-bound technique. We demonstrate through Monte Carlo simulations that our proposed MIP scheduling method is very computational efficient as we can find optimal solutions to scheduling problems involving 50-60 sensors with processing time in the order of seconds.

关键词： sensor networks

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Phased array With Improved Beamforming Capability via Use of Double Phase Shifters 12

Phased Array With Improved Beamforming Capability via Use of...

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ieee 12th sensor array and multichannel signal processing workshop (SAM)

作者： Xu, Zhaoyi Petropulu, Athina P. Rutgers State Univ Dept Elect & Comp Engn New Brunswick NJ 08854 USA

ISBN: (纸本)9781665406338

The passive electronically scanned array (PESA) is widely used due to its simple structure and low cost. Its antenna weights have unit modulus and thus, only the weights phases can be controlled. PESA has limited degrees of freedom for beampattern design, where only the direction of the main beam can be controlled. In this paper we propose a novel way to improve the beamforming capability of PESA by endowing it with more degrees of freedom via the use of double phase shifters (DPS). By doing so, both the magnitude and the phase of the antenna weights can be controlled, allowing for more flexibility in the beampattern design. We also take into account the physical resolution limitation of phase shifters, and propose a method to approximate a given complex beamformer using DPS. Simulation results indicate significant beamforming improvement even at low phase resolution.

关键词： Phased array Double phase shifters Beampattern

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Target Reflectivity Characterization for FDA Radar 11

Target Reflectivity Characterization for FDA Radar

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ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Gui, Ronghua Wang, Wen-Qin So, Hing-Cheung Cui, Can Univ Elect Sci & Technol China Chengdu Peoples R China City Univ Hong Kong Hong Kong Peoples R China Shanghai Elect Mech Inst Shanghai Peoples R China

ISBN: (纸本)9781728119465

As an emerging array processing technique, frequency diverse array (FDA) differs from conventional phased-array in that it employs a frequency increment across the array elements. The use of frequency increment provides FDA with an array factor with joint range-angle dependency, which finds wide applications in joint range-angle target localization and range-dependent interference/clutter suppression. In the open literature, an ideal point-like target in far field is generally assumed for FDA signal modelling. However, the reflectivity characterization for more realistic targets, which are not ideally point-like and even extended in range and azimuth angle, has not been reported for FDA radar. In this paper, we establish an echo signal model of FDA radar for a general target, and then analyze the statistics of the echo signal amplitude. More specifically, we reveal the amplitude decorrelation property between different FDA elements due to the use of frequency increment, which provides useful insight into frequency increment design. The target reflectivity characteristic analysis is validated by numerical results.

关键词： Frequency diverse array (FDA) radar cross section (RCS) reflection coefficient frequency decorrelation extended target

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A DEEP REINFORCEMENT LEARNING APPROACH FOR INTEGRATED AUTOMOTIVE RADAR SENSING AND COMMUNICATION 12

A DEEP REINFORCEMENT LEARNING APPROACH FOR INTEGRATED AUTOMO...

引用

ieee 12th sensor array and multichannel signal processing workshop (SAM)

作者： Xu, Lifan Zheng, Ruxin Sun, Shunqiao Univ Alabama Dept Elect & Comp Engn Tuscaloosa AL 35487 USA

ISBN: (纸本)9781665406338

We present a deep reinforcement learning approach to design an automotive radar system with integrated sensing and communication. In the proposed system, sparse transmit arrays with quantized phase shifter are used to carry out transmit beamforming to enhance the performance of both radar sensing and communication. Through interaction with environment, the automotive radar learns a reward that reflects the difference between mainlobe peak and the peak sidelobe level in radar sensing mode or communication user feedback in communication mode, and intelligently adjust its beamforming vector. The Wolpertinger policy based actioncritic network is introduced for beamforming vector learning, which solves the dimension curse due to huge beamforming action space.

关键词： Deep reinforcement learning integrated sensing and communication (ISAC) automotive radar sparse array beamforming

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Envelope Only TDOA Estimation for sensor Network Self Calibration

Envelope Only TDOA Estimation for Sensor Network Self Calibr...

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8th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Zion, Dan Ohev Messer, Hagit Tel Aviv Univ Sch Elect Engn IL-69978 Tel Aviv Israel

ISBN: (纸本)9781479914814

Self localization of nodes in wireless sensor networks (WSN) attracts wide interest in the past few years. The main challenge is to adopt calibration algorithms to the low-power/low-bandwidth/low-cost constrains on each sensor in the network. In this paper we present a novel approach, in which position-known anchors transmit special calibration signals simultaneously. Each node measures only the received signal strength (RSSI), i.e. envelope of the sum of received signals, and estimates time difference of arrivals (TDOA) of the signals. Two or more TDOA measurements allow the node to estimate its own position in the WSN. Based on an analysis of the appropriate Cramer Rao Lower Bound (CRLB) on the TDOA estimates, we suggest the choice of calibrating signals which provide optimal performance. The theoretical results are supported by simulations of the Maximum Likelihood (ML) estimators and numerical evaluation of the CRLB for a specific scenario of interest.

关键词： Wireless sensor networks sensor networks received signal envelopes Time difference of arrival WSN gene Self calibration numerical calculation Envelope Calibration Line of nodes signals

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Integrated waveform design for an Integrated Radar and Communication System with a Uniform Linear array 11

Integrated waveform design for an Integrated Radar and Commu...

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ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Jiang, Mengchao Liao, Guisheng Yang, Zhiwei Liu, Yongjun Chen, Yufeng Li, Haichuan Xidian Univ Natl Lab Radar Signal Proc Xian Peoples R China

ISBN: (纸本)9781728119465

To reduce the consumption of spectrum and hardware resource, two methods are proposed to design the integrated waveform that can satisfy the requirements for both radar and communication. First, a linear superposition (LS) method is proposed to design the transmit waveforms of a uniform linear array (ULA). In the far field of the ULA, the designed transmit waveforms can simultaneously synthesize the desired radar and communication waveforms in different directions. However, the designed waveforms usually have high peak-to-average power ratio (PAPR). Then, an alternative projection (AP) method is proposed to reduce the PAPR of the transmit waveforms. The AP method can devise the waveforms with constant modulus. Both the proposed methods can perform radar and communication function in different directions. Finally, several simulation results are given to verify the effectiveness of the proposed methods.

关键词： waveform design integrated radar and communication spectral sharing waveform synthesis

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Listener-Position Adaptive Crosstalk Cancelation Using A Parameterized Superdirective Beamformer 10

Listener-Position Adaptive Crosstalk Cancelation Using A Par...

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10th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Ma, Xiaohui Hohnerlein, Christoph Ahrens, Jens Dynaudio AS DK-8660 Skanderborg Denmark Berlin Inst Technol Ernst Reuter Pl 7 D-10587 Berlin Germany Chalmers Univ Technol S-41296 Gothenburg Sweden Aarhus Univ Dept Engn Finlandsgade 22 DK-8200 Aarhus N Denmark

ISBN: (纸本)9781538647523

We present a method for cancelation of the acoustic crosstalk between the ears of a listener using a linear loudspeaker array. This allows for controlling the signals that arise at listener's ear independently of each other so that binaural cues can be imposed. We employ superdirective near-field beamforming (SDB) over the vast part of the frequency range. Allowing the listener to move in front of the array requires the computation of a new SDB solution for each possible position of the listener, which is a computationally expensive procedure. We show that the beamformer weights exhibit a very smooth evolution for listening positions along a line parallel to the array. This makes it straightforward to parameterize pre-computed beamformer weights with a few parameters for each frequency. Upon realtime execution, the beamformer weights can be determined efficiently for any arbitrary position along the listener contour from the parameters with negligible error. Simulation results show that the proposed beamformer provides a higher channel separation than previously published solutions while maintaining robustness.

关键词： Loudspeakers Ear Crosstalk array signal processing Robustness sensor arrays"

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