Parameters Estimation and Imaging of Ground Moving Target in a One-stationary Bi-static SAR

Authors

Abstract

In this paper, the equation of the received signal of a moving target with constant acceleration in
a special case of  Bi-static SAR, named one-stationary, is derived in  a slant range plane.  In the
one-stationary  geometry,  usually  range  curvature  and  Doppler  ambiguity  is  very  large  due  to
wide  beam-width  and  assumption  of  accelerating  movement  of  the  target.  Hence,  transforms
such  as  Radon  and  Keystone  have  little  accuracy  for  both  estimating  Doppler  centroid  and
removing range cell migration. In this paper, a two-step algorithm is proposed for estimation of
Doppler  centroid.  That  is  a  combination  of  radon  transform  and  a  search  algorithm.  Then,  by
extraction of a system of equations, an estimation of target’s velocity and acceleration is
obtained and finally, an image formation algorithm is presented. Compared to usual algorithms,
the accuracy of the derived equations and the strength of the proposed algorithm in the presence
of noise and clutter are confirmed by simulations.

Keywords

References

 
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Radar
Volume 5, Issue 4 - Serial Number 4
September 2018
Pages 11-24

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History

  • Receive Date: 14 May 2017
  • Revise Date: 26 February 2019
  • Accept Date: 19 September 2018
  • Publish Date: 21 January 2018

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