Estimation of pulse repetition intervals based on PRI transform
Yang Shao-quan · Jounal of Xidian University · 2002
The pulse repetition interval (PRI) is one of the important parameters of signal sorting. The traditional algorithms for estimating PRI are based on the autocorrelation function of the pulse train. The autocorrelation function peaks are yielded not only at the locations of PRI contained in the original pulse train but also at the locations of the integer multiple of the fundamental PRI, i.e., which make it difficult to deinterleave pulse trains. In order to overcome the drawback, the algorithm for estimating pulse repetition intervals based on the PRI transform is introduced in this paper, which can suppress the subharmonics in the autocorrelation function almost completely. Emphasis is put on discussing the capability of the algorithm to deinterleave various radar signals with varied PRI. Research results based on computer simulation show that this algorithm is capable of detecting the PRI of various signals. In order to get better detecting results, it is necessary to vary the tolerance parameter in the PRI transform. The technique for selecting the tolerance parameter is also discussed.