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arXiv 2212.04261eess.SP
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存在未知互耦时的自适应雷达检测与方位估计

Adaptive Radar Detection and Bearing Estimation in the Presence of Unknown Mutual Coupling

Augusto Aubry, Antonio De Maio, Lan Lan, Massimo Rosamilia

AI总结:

针对阵列互耦未知问题,本文基于ULA流形线性化与对称Toeplitz耦合建模,提出GLRT/MM检测器及MFLRT扩展,实现联合自适应检测与方位估计。

摘要:

本文研究阵列单元之间存在互耦情况下的联合自适应雷达检测与目标方位估计。首先,通过将均匀线阵(ULA)流形围绕标称阵列指向进行线性化,并使用对称Toeplitz结构矩阵表示互耦效应,建立了多通道雷达接收信号的合适模型。随后,在均匀雷达环境假设下推导了广义似然比检验(GLRT)检测器。其计算利用特定的Minorization-Maximization(MM)框架,在目标存在假设下优化集中似然函数,并证明了该框架的收敛特性。此外,当有效互耦系数的数量未知时,采用多族似然比检验(MFLRT)方法。在分析阶段,将新检测器的性能与基准检测器以及公开文献中忽略互耦现象的同类方法进行比较。结果表明,为保证性能水平接近基准,有必要从设计阶段就审慎考虑耦合效应。

英文摘要:

This paper deals with joint adaptive radar detection and target bearing estimation in the presence of mutual coupling among the array elements. First of all, a suitable model of the signal received by the multichannel radar is developed via a linearization procedure of the Uniform Linear Array (ULA) manifold around the nominal array looking direction together with the use of symmetric Toeplitz structured matrices to represent the mutual coupling effects. Hence, the Generalized Likelihood Ratio Test (GLRT) detector is evaluated under the assumption of homogeneous radar environment. Its computation leverages a specific Minorization-Maximization (MM) framework, with proven convergence properties, to optimize the concentrated likelihood function under the target presence hypothesis. Besides, when the number of active mutual coupling coefficients is unknown, a Multifamily Likelihood Ratio Test (MFLRT) approach is invoked. During the analysis phase, the performance of the new detectors is compared with benchmarks as well as with counterparts available in the open literature which neglect the mutual coupling phenomenon. The results indicate that it is necessary to consider judiciously the coupling effect since the design phase, to guarantee performance levels close to the benchmark.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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