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SCIENCE CHINA Information Sciences, Volume 59, Issue 12: 122309(2016) https://doi.org/10.1007/s11432-015-0602-9

Segment-sliding reconstruction of pulsed radar echoes with sub-Nyquist sampling

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  • ReceivedJul 27, 2015
  • AcceptedFeb 29, 2016
  • PublishedJul 7, 2016

Abstract

It has been shown that analog-to-information conversion (AIC) is an efficient scheme to perform sub-Nyquist sampling of pulsed radar echoes. However, it is often impractical, if not infeasible, to reconstruct full-range Nyquist samples because of huge storage and computational load requirements. Based on the analyses of AIC measurement system, this paper develops a novel segment-sliding reconstruction (SegSR) scheme to effectively reconstruct the Nyquist samples. The SegSR performs segment-by-segment reconstruction in a sliding mode and can be implemented in real time. An important characteristic that distinguishes the proposed SegSR from existing methods is that the measurement matrix in each segment satisfies the restricted isometry property (RIP) condition. Partial support in the previous segment can be incorporated into the estimation of the Nyquist samples in the current segment. The effect of interference introduced from adjacent segments is theoretically analyzed, and it is revealed that the interference consists of two interference levels with different impacts to the signal reconstruction performance. With these observations, a two-step orthogonal matching pursuit (OMP) procedure is proposed for segment reconstruction, which takes into account different interference levels and partially known support of the previous segment. The proposed SegSR scheme achieves near-optimal reconstruction performance with a significant reduction of computational loads and storage requirements. Theoretical analyses and simulations verify its effectiveness.


Funded by

National Natural Science Foundation of China(61171166)

National Natural Science Foundation of China(61401210)

National Natural Science Foundation of China(61571228)

China Postdoctoral Science Foundation(2014M551597)


Acknowledgment

Acknowledgments

This work was supported by National Natural Science Foundation of China (Grant Nos. 61171166, 61401210, 61571228), and China Postdoctoral Science Foundation (Grant No. 2014M551597).


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