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Estimation of Extended Targets Based on Compressed Sensing in Cognitive Radar System

机译：认知雷达系统中基于压缩感知的扩展目标估计

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摘要

In this paper, the ranges and velocities of multiple extended targets are estimated by exploiting the target sparsity in the cognitive radar system. Different from the point targets in the traditional compressed sensing (CS) radar, the parameters of extended targets are expressed and estimated by using a novel CS-based model. Since the echo signals from extended targets are the convolutions between the transmitted waveform and target impulse responses (TIRs), the dictionary matrices in the proposed cognitive radar for all extended targets must be first established in the CS-based reconstruction algorithm. Then, the target parameters are estimated by reconstructing the nonzero entries of a sparse vector. To further improve the performance of CS reconst-ruction, a novel two-step method is proposed to minimize the mutual coherence of the dictionary matrix by optimizing the transmitted waveform. Simulation results demonstrate that the estimation performance of the extended targets is significantly improved by optimizing the transmitted waveform.
机译：本文通过利用认知雷达系统中的目标稀疏度来估计多个扩展目标的范围和速度。与传统的压缩感知（CS）雷达中的点目标不同，扩展目标的参数通过使用基于CS的新型模型来表示和估算。由于来自扩展目标的回波信号是发射波形与目标脉冲响应（TIR）之间的卷积，因此必须首先在基于CS的重建算法中针对所有扩展目标在建议的认知雷达中建立字典矩阵。然后，通过重建稀疏向量的非零条目来估计目标参数。为了进一步提高CS重构的性能，提出了一种新颖的两步法，通过优化传输波形来最大程度地减少字典矩阵的相干性。仿真结果表明，通过优化发射波形，可以大大提高扩展目标的估计性能。

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  • 来源
    《IEEE Transactions on Vehicular Technology》 |2017年第2期|941-951|共11页
  • 作者

    Peng Chen; Chenhao Qi; Lenan Wu; Xianbin Wang;

  • 作者单位

    Department of Electrical Engineering, School of Information Science and Engineering, Southeast University, Columbia University, Nanjing, New York, NY, ChinaUSA;

    School of Information Science and Engineering, Southeast University, Nanjing, China;

    School of Information Science and Engineering, Southeast University, Nanjing, China;

    Department of Electrical Engineering, School of Information Science and Engineering, Southeast University, Columbia University, Nanjing, New York, NY, ChinaUSA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Delays; Dictionaries; Doppler effect; Sparse matrices; Estimation;

    机译：延迟;字典;多普勒效应;稀疏矩阵;估计;

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