Radars use coherence to increase the signal-processing gain. In electronic support, that same coherence can be exploited to accurately estimate carrier frequency when measured modulo the pulse repetition frequency. Such estimates can be used for passive emitter geolocation, for example. In the pioneering work of Howard & Lavoie on this topic [1], [2], results are demonstrated only where the pulse repetition interval (PRI) is an integer and where pulses are sinusoidal. In this paper, we show how the results can be generalised to a broad class of pulse shapes, without needing to know the pulse shape in advance. We also show how the signals may be efficiently processed when the PRI is non-integer.

中文翻译：

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相干、周期性脉冲序列中的频率估计

雷达使用相干性来增加信号处理增益。在电子支持中，当以脉冲重复频率为模测量时，可以利用相同的相干性来准确估计载波频率。例如，此类估计可用于无源发射器地理定位。在 Howard & Lavoie 关于该主题的开创性工作 [1]、[2] 中，结果仅在脉冲重复间隔 (PRI) 为整数且脉冲为正弦的情况下得到证明。在本文中，我们展示了如何将结果推广到一大类脉冲形状，而无需事先知道脉冲形状。我们还展示了当 PRI 为非整数时如何有效地处理信号。