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Open Access Research

Coprime sampling for nonstationary signal in radar signal processing

Qiong Wu and Qilian Liang*

Author Affiliations

Department of Electrical Engineering, University of Texas at Arlington, Texas, 76019-0016, Arlington, USA

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EURASIP Journal on Wireless Communications and Networking 2013, 2013:58  doi:10.1186/1687-1499-2013-58

Published: 4 March 2013

Abstract

Estimating the spectrogram of non-stationary signal relates to many important applications in radar signal processing. In recent years, coprime sampling and array attract attention for their potential of sparse sensing with derivative to estimate autocorrelation coefficients with all lags, which could in turn calculate the power spectrum density. But this theoretical merit is based on the premise that the input signals are wide-sense stationary. In this article, we discuss how to implement coprime sampling for non-stationary signal, especially how to attain the benefits of coprime sampling meanwhile limiting the disadvantages due to lack of observations for estimations. Furthermore, we investigate the usage of coprime sampling for calculating ambiguity function of matched filter in radar system. We also examine the effect of it and conclude several useful guidelines of choosing configuration to conduct the sparse sensing while retain the detection quality.

Keywords:
Coprime sampling; Non-stationary signal; Short-time Fourier transform; Radar signal processing