Paper Information

Journal:   JOURNAL OF RADAR   WINTER 2017 , Volume 4 , Number 4 (SERIAL NO. 14) #E0042; Page(s) 49 To 63.
 
Paper: 

ESTIMATION OF GROUND MOVING TARGET PARAMETERS IN SQUINT SINGLE-ANTENNA SYNTHETIC APERTURE RADAR

 
 
Author(s):  ZABIHI MADDAH S.M., SEYEDEIN S.A.*
 
* FERDOWSI UNIVERSITY OF MASHHAD
 
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.

 
Keyword(s): SYNTHETIC APERTURE RADAR (SAR), SQUINTED SAR, GROUND MOVING TARGET, PARAMETER ESTIMATION
 
References: 
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