A Doppler Resampling Based Imaging Algorithm for High Squint SAR with Constant Acceleration

Ning LI; Bowen BIE; Mengdao XING; Guangcai SUN

doi:10.11999/JEIT180953

Volume 41 Issue 12

Dec. 2019

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Article Navigation > Journal of Electronics & Information Technology > 2019 > 41(12): 2873-2880

Ning LI, Bowen BIE, Mengdao XING, Guangcai SUN. A Doppler Resampling Based Imaging Algorithm for High Squint SAR with Constant Acceleration[J]. Journal of Electronics & Information Technology, 2019, 41(12): 2873-2880. doi: 10.11999/JEIT180953

Citation:

Ning LI, Bowen BIE, Mengdao XING, Guangcai SUN. A Doppler Resampling Based Imaging Algorithm for High Squint SAR with Constant Acceleration[J]. Journal of Electronics & Information Technology, 2019, 41(12): 2873-2880. doi: 10.11999/JEIT180953

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A Doppler Resampling Based Imaging Algorithm for High Squint SAR with Constant Acceleration

doi: 10.11999/JEIT180953

1.
National Key Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China
2.
Collaborative Innovation Center of Information Sensing and Understanding, Xidian University, Xi’an 710071, China

Funds: The National Key R&D Program of China (2017YFC1405600), The Foundation for Innovotive Research Groups of the National Natural Science Foundation of China (61621005), The Fundamental Research Funds for the Central Universities (JB180213)

Received Date: 2018-10-12
Rev Recd Date: 2019-05-21

Available Online: 2019-05-31

Publish Date: 2019-12-01

Abstract

Abstract

A modified SPECtral ANalysis (SPECAN) algorithm based on Doppler resampling is proposed to deal with the azimuth Space-Variant (SV) phase coefficients of the High Squint (HS) SAR data acquired from maneuvering platform. Firstly, for HS SAR with constant acceleration, an orthogonal coordinate slant range model is presented, which can handle the coordinate rotation caused by the traditional method of Range Walk Correction (RWC), and solve the mismatch between the range model and the signal after RWC. Then azimuth Doppler resampling is used to correct the SV phase coefficients. The focused image is achieved by SPECAN technique. Finally, the proposed algorithm is validated by processing of simulated SAR data, and has significant improvement on focusing quality over the reference one.
- SAR imaging,
- Constant acceleration,
- Orthogonal coordinate slant range model,
- Space-Variant (SV) phase,
- Doppler resampling,
- SPECtral ANalysis (SPECAN)

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References(14)

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