A new method of moving target velocity measurement and location based on FrFT

doi:10.7523/j.ucas.2021.0017

Abstract

Abstract: In traditional, the way to measure the velocity of moving targets using FrFT(fractional Fourier transform) is based on 2D searching. The FrFT is calculated by traversing all angles and the optimal solution is the peak value of 2D plane. The method needs to trade off computational accuracy and computational complexity. In this paper, a new method of velocity measurement and location for moving targets is proposed. Firstly, the FrFT of two different angles and their projection are calculated. Then, the optimal rotation angle for moving target is calculated by using geometric relationship in the time-frequency plane. Finally, the FrFT under the optimal rotation angle is calculated, and velocity and position parameters of moving target are calculated. Moreover, static cluster can be suppressed if two angles for FrFT are symmetric about π. In general, the proposed method is faster and more accurate than the traditional method. The effectiveness and superiority of the method are verified by simulation and real data experiments.

Key words: synthetic aperture radar (SAR), ground moving-target indication (GMTI), fractional Fourier transform(FrFT), velocity measurement

CLC Number:

TN957.52

SHEN Xiaotian, ZHENG Mingjie. A new method of moving target velocity measurement and location based on FrFT[J]. Journal of University of Chinese Academy of Sciences, 2023, 40(1): 84-92.

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