Integrated passive radar (IPR) can be regarded as next-generation passive radar technology, which aims to integrate communication and radar systems. Unlike conventional passive radar, which does not prioritize communication-centric radar technology, IPR technology places a higher priority on incorporating specific radar constraints to develop waveforms that are better suited for radar applications. This paper deals with the problem of distributed MIMO IPR target detection under uncalibrated surveillance/reference receivers. We focus on a communication-centric radar system consisting of several opportunity transmitters non-overlapping in frequency with the same bandwidth and several spatially separated receivers. Five new detectors are devised according to the likelihood ratio test (LRT), Rao, Wald, Gradient, and Durbin criteria. Although it is shown that these detectors are asymptotically equivalent, they provide different performances in the presence of noisy reference channels. The invariance principle is applied in this paper to show that all uncertainties affecting threshold setting can be unified in the direct-path signal power-to-noise power ratio (DNR) of the reference channels. To ensure effective detection threshold setting regardless of the DNR values in the reference channels, we introduce a novel strategy to adjust the level of the proposed detectors rather than their sizes. Then, we examine false alarm regulations and the detection performance of the fixed-level proposed detectors to demonstrate their effectiveness compared to several existing detectors. Thus, we create a unified framework for uncalibrated MIMO IPR target detection in the presence of noisy reference channels.

中文翻译：

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集成 MIMO 无源雷达目标检测


集成无源雷达（IPR）可以被视为下一代无源雷达技术，旨在集成通信和雷达系统。与不优先考虑以通信为中心的雷达技术的传统无源雷达不同，IPR 技术更注重结合特定的雷达约束，以开发更适合雷达应用的波形。本文研究了未校准监视/参考接收机下的分布式 MIMO IPR 目标检测问题。我们专注于以通信为中心的雷达系统，该系统由多个频率不重叠且带宽相同的机会发射器和多个空间上分离的接收器组成。根据似然比检验 (LRT)、Rao、Wald、Gradient 和 Durbin 准则设计了五种新检测器。尽管表明这些检测器是渐近等效的，但它们在存在噪声参考通道的情况下提供不同的性能。本文应用不变性原理表明，影响阈值设置的所有不确定性可以统一在参考通道的直接路径信号功率噪声功率比（DNR）中。为了确保有效的检测阈值设置，无论参考通道中的 DNR 值如何，我们引入了一种新颖的策略来调整所提出的检测器的级别而不是其大小。然后，我们检查误报规则和固定级别提议的探测器的探测性能，以证明其与几种现有探测器相比的有效性。因此，我们创建了一个统一的框架，用于在存在噪声参考通道的情况下进行未校准的 MIMO IPR 目标检测。