Ambiguity clutter for airborne radar systems is usually caused by a uniform pulse repetition interval (UPRI) waveform, which significantly degrades target detection and location performance. To address this issue, this article proposes an ambiguity clutter suppression method resorting to a pseudorandom pulse repetition interval (PrPRI) waveform. First, an airborne radar clutter model accounting for multiple range rings with PrPRI waveform is developed. Next, a nonuniform coherent processing framework is introduced to eliminate the clutter folded in the range and Doppler domain. In particular, the reasons for the enlargement of the area free of clutter corresponding to PrPRI mode are analyzed, as well as the maximum unambiguous Doppler frequency, maximum unambiguous range, and design principles for PRI are derived. Finally, numerical examples are designed to verify that the nonuniform coherent processing framework can enlarge the clutter-free area and achieve unambiguity target detection and location.

中文翻译：

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机载雷达系统的伪随机脉冲重复区间模糊杂波抑制

机载雷达系统的模糊杂波通常是由统一脉冲重复间隔 (UPRI) 波形引起的，这会显着降低目标检测和定位性能。为了解决这个问题，本文提出了一种采用伪随机脉冲重复间隔（PrPRI）波形的模糊杂波抑制方法。首先，开发了一种机载雷达杂波模型，该模型考虑了具有 PrPRI 波形的多个距离环。接下来，引入了一个非均匀相干处理框架来消除在距离和多普勒域中折叠的杂波。特别分析了PrPRI模式对应的无杂波面积扩大的原因，推导出了PRI的最大无模糊多普勒频率、最大无模糊范围和设计原则。最后，