Estimation of Ground Moving Target Parameters in Squint Single-Antenna Synthetic Aperture Radar

Document Type : Original Article

Authors

Abstract

In this paper, by considering a squint angle for synthetic aperture radar in the strip-map mode, a
method is proposed for estimating parameters of a fixed acceleration moving target. Non-zero
Doppler centroid and range-azimuth coupling in the squint mode add complexity to estimation
equations of moving target parameters and cause Doppler ambiguity. This, in turn, causes to
lose the efficiency of using the keystone transform. Furthermore, Radon transform in the squint
mode will not give accurate results in determining the unambiguous Doppler centroid. Hence, in
this paper, by using a Geometry-based Doppler centroid estimator, an approach is proposed to
improve the precision of Radon transform which is capable to correct linear range migration.
Finally, by employing local polynomial Fourier transform, Doppler parameters of order two and
three are obtained. By estimating Doppler bandwidth, the target synthetic aperture time is then
obtained. The accuracy of our derived equations is examined and verified by simulation just
using a single antenna.

Keywords

References

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History

  • Receive Date: 20 October 2016
  • Revise Date: 22 January 2024
  • Accept Date: 19 September 2018
  • Publish Date: 20 January 2017

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