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Sensors 2015, 15(2), 3750-3765; doi:10.3390/s150203750

Modified Omega-k Algorithm for High-Speed Platform Highly-Squint Staggered SAR Based on Azimuth Non-Uniform Interpolation

1
School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
2
Electronic and Electronic Engineering Department, University of Sheffield, Sheffield S1-3JD, UK
*
Author to whom correspondence should be addressed.
Received: 22 December 2014 / Accepted: 2 February 2015 / Published: 5 February 2015
(This article belongs to the Section Remote Sensors)
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Abstract

In this work, the staggered SAR technique is employed for high-speed platform highly-squint SAR by varying the pulse repetition interval (PRI) as a linear function of range-walk. To focus the staggered SAR data more efficiently, a low-complexity modified Omega-k algorithm is proposed based on a novel method for optimal azimuth non-uniform interpolation, avoiding zero padding in range direction for recovering range cell migration (RCM) and saving in both data storage and computational load. An approximate model on continuous PRI variation with respect to sliding receive-window is employed in the proposed algorithm, leaving a residual phase error only due to the effect of a time-varying Doppler phase caused by staggered SAR. Then, azimuth non-uniform interpolation (ANI) at baseband is carried out to compensate the azimuth non-uniform sampling (ANS) effect resulting from continuous PRI variation, which is further followed by the modified Omega-k algorithm. The proposed algorithm has a significantly lower computational complexity, but with an equally effective imaging performance, as shown in our simulation results. View Full-Text
Keywords: staggered SAR; continuous PRI variation; azimuth non-uniform sampling (ANS); modified Omega-k staggered SAR; continuous PRI variation; azimuth non-uniform sampling (ANS); modified Omega-k
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zeng, H.-C.; Chen, J.; Liu, W.; Yang, W. Modified Omega-k Algorithm for High-Speed Platform Highly-Squint Staggered SAR Based on Azimuth Non-Uniform Interpolation. Sensors 2015, 15, 3750-3765.

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