Coherent Pulsed-FDA Radar Receiver Design With Time-Variance Consideration: SINR and CRB Analysis
Coherent Pulsed-FDA Radar Receiver Design With Time-Variance Consideration: SINR and CRB Analysis
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DOI：
10.1109/tsp.2017.2764860
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发表时间：
2018
影响因子：
5.4
通讯作者：
R. Gui;Wen-qin Wang;Can Cui;H. So
中科院分区：
文献类型：
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作者：
R. Gui;Wen-qin Wang;Can Cui;H. So
与传统相控阵只能提供角度相关波束图不同，变频阵可以产生角度相关波束图和时变波束图。现有研究表明，FDA在干扰抑制和目标定位方面有较好的性能，但时变波束会给后续匹配滤波带来干扰。更严重的是，在滤波过程中，与距离相关的信号相位可能被抵消。事实上，传统的单通道接收机并没有充分利用FDA信号的多载波特性。本文提出了一种考虑时变特性的多通道匹配滤波结构，用于接收脉冲fda信号。针对加性彩色高斯噪声情况下的角度、距离和时变问题，建立了相干脉冲- fda雷达信号模型，并遵循相应的波形设计原则。此外，导出了输出信噪比的封闭表达式以及角度和距离的cram<s:1> r - rao界。大量的数值结果验证了所提出的接收机设计方法和相应的理论性能推导。
Different from conventional phased-array providing only angle-dependent beampattern, frequency diverse array (FDA) produces angle-range-dependent and time-variant transmit beampattern. Existing investigations show that FDA offers improved performance in interference suppression and target localization, but the time-variant beampattern will bring interferences to subsequent matched filtering. More seriously, the range-dependent signal phase may be canceled out in the filtering process. In fact, traditional single-channel receiver does not fully exploit the multicarrier feature in FDA signals. In this paper, we propose a multichannel matched filtering structure with considering the time-variance property for receiving pulsed-FDA signals. A coherent pulsed-FDA radar signal model to deal with the angle-range-dependent and time-variance problem is devised under additive colored Gaussian noise scenarios, followed by the corresponding waveform design principle. Moreover, closed-form expressions of the output signal-to-interference-plus-noise ratio and Cramér–Rao bounds for angle and range are derived. The proposed receiver design approach and corresponding theoretical performance derivations are verified by extensive numerical results.