Leakage in frequency-modulated continuous-wave (FMCW) radar with a homodyne receiver induces strong signal components in the lower frequency parts of the radar observations. There, the dynamic range of the observations has been reduced, such that close and weak targets are hard to detect. In this letter, a signal processing method is proposed to mitigate the leakage. First, background subtraction is applied to cancel the leakage. As the cancellation is imperfect, a noisy signal portion remains: the leakage noise. A statistical model is developed to describe the leakage noise as a colored noise process. This model is parameterized from measurements and used to whiten the observations. As a result, the dynamic range is improved, and the close targets become better detectable.

中文翻译：

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通过背景减法和白化减轻 FMCW 雷达泄漏

带有零差接收器的调频连续波 (FMCW) 雷达的泄漏会在雷达观测的低频部分引起强信号分量。在那里，观察的动态范围已经减小，以至于难以检测到近处和弱目标。在这封信中，提出了一种信号处理方法来减轻泄漏。首先，应用背景减法来消除泄漏。由于消除不完美，噪声信号部分仍然存在：泄漏噪声。开发了一种统计模型来将泄漏噪声描述为有色噪声过程。该模型从测量中参数化并用于白化观察。结果，动态范围得到改善，并且近距离目标变得更好可检测。