Joint space-time–frequency method based on fractional Fourier transform to estimate moving target parameters for multistatic synthetic aperture radar

Liu Mei; Li Chenlei; Zhao Shuqing

Joint space-time–frequency method based on fractional Fourier transform to estimate moving target parameters for multistatic synthetic aperture radar

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Author(s): Liu Mei ¹ ; Li Chenlei ¹ ; Zhao Shuqing
- Affiliations: 1: Department of Electronic Engineering, Harbin Institute of Technology, HIT, Harbin 150001, HL, People's Republic of China
Source: Volume 7, Issue 1, February 2013, p. 71 – 80
DOI: 10.1049/iet-spr.2011.0427 , Print ISSN 1751-9675, Online ISSN 1751-9683

Received 18/11/2011, Accepted 26/11/2012, Revised 31/10/2012, Published

In practice, the configuration of spaceborne multistatic synthetic aperture radar (MSAR) is generally three-dimensional (3D) stereo geometry, under which condition most current algorithms of motion parameter estimation are invalid. In this study, a joint space-time–frequency method is presented to estimate motion parameters of ground moving target for MSAR of 3D geometry. First, the array expression for azimuth echo named extended space-time model (ESTM) is derived; then on the basis of ESTM, a spatial time–frequency distribution method based on fractional Fourier transform algorithm is derived; finally the performance of the presented method is analysed, and the advantages comparing with velocity synthetic aperture radar are discussed via some computer simulations. The work provides a feasible method of multi-channel processing for the 3D MSAR.

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Joint space-time–frequency method based on fractional Fourier transform to estimate moving target parameters for multistatic synthetic aperture radar

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