Paper Info
Title
An Improved Imaging Algorithm for High-Resolution Spotlight SAR with Continuous PRI Variation Based on Modified Sinc Interpolation.
Abstract
This paper focuses on an improved imaging algorithm for spotlight synthetic aperture radar (SAR) with continuous Pulse Repetition Interval (PRI) variation in extremely high-resolution. Conventional SAR systems are limited in that a wide swath cannot be achieved with a high azimuth resolution in the meantime. This limitation can be overcome by Pulse Repetition Frequency (PRF) variation in a SAR system. However, there are problems such as the ambiguities of point targets or extended targets caused by nonuniform sampling. A reconstructive method, Nonuniform Discrete Fourier Transform (NUDFT) has been presented in the current literature, but it is rather computationally expensive. In this paper, a modified sinc interpolation based on NUDFT is proposed, which is used to reconstruct the uniformly sampled echo in time domain. Since the interpolation kernel length is relatively short, it is more computationally efficient. Then, the two-step processing approach combined with the modified sinc interpolation is further presented, which has much better accuracy than that combined with the conventional sinc interpolation. Both the simulated data and the extracted GF-3 data experiment demonstrate the validity and accuracy of the proposed approach.
Year
DOI
Venue
2019
10.3390/s19020389
SENSORS
Keywords
Field
DocType
modified sinc interpolation,spotlight SAR,PRI variation,high-resolution
Time domain,Pulse repetition frequency,Synthetic aperture radar,Interpolation,Azimuth,Algorithm,Whittaker–Shannon interpolation formula,Electronic engineering,Engineering,Discrete Fourier transform,Nonuniform sampling
Journal
Volume
Issue
ISSN
19
2
1424-8220
Citations 
PageRank 
References 
0
0.34
9
Authors
5
Name
Order
Citations
PageRank
Shiyang Chen100.34
Lijia Huang2316.40
Xiaolan Qiu319026.75
Mingyang Shang400.34
Bing Han5279.29