Method for Frequency Error Compensation Based on Raw Data for SAR System with Bandwidth Synthesis

Sujuan FANG; Guangzuo LI; Yifei ZHANG; Wenxian YU; Yirong WU

doi:10.11999/JEIT180079

Volume 40 Issue 12

Nov. 2018

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Article Navigation > Journal of Electronics & Information Technology > 2018 > 40(12): 2834-2840

Sujuan FANG, Guangzuo LI, Yifei ZHANG, Wenxian YU, Yirong WU. Method for Frequency Error Compensation Based on Raw Data for SAR System with Bandwidth Synthesis[J]. Journal of Electronics & Information Technology, 2018, 40(12): 2834-2840. doi: 10.11999/JEIT180079

Citation:

Sujuan FANG, Guangzuo LI, Yifei ZHANG, Wenxian YU, Yirong WU. Method for Frequency Error Compensation Based on Raw Data for SAR System with Bandwidth Synthesis[J]. Journal of Electronics & Information Technology, 2018, 40(12): 2834-2840. doi: 10.11999/JEIT180079

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Method for Frequency Error Compensation Based on Raw Data for SAR System with Bandwidth Synthesis

doi: 10.11999/JEIT180079

1.
School of Electronic Information and Electrical Engineering, Shanghai Jiaotong University, Shanghai 200240, China
2.
Insititute of Electrics, Chinese Academy of Sciences, Beijing 100190, China

Received Date: 2018-01-19
Rev Recd Date: 2018-07-24

Available Online: 2018-08-03

Publish Date: 2018-12-01

Abstract

Abstract

To improve the resolution of the SAR system, radar bandwidth should be improved. By means of synthetic bandwidth, wide bandwidth can be achieved with less hardware complexity. For frequency band synthesis SAR system, frequency difference should be accurately known. However, in the real measurement situation, the frequency difference may drift and should be estimated based on the raw data. In this manuscript, an effective method is proposed to estimate the frequency difference error and compensate the phase error. Based on the relation between the interferometric phase of subband echoes and frequency difference, the frequency difference drift is estimated. The interferometry between subband images yields the interferometric image. It is observed that in the yielded image, phase varies with range and the slope is proportional to the frequency difference. Also, the phase is redundant along azimuth. Based on the redundancy along azimuth, a new vector is formed. The vector is a sinusoidal signal with the frequency value corresponding to the relative range shift. Frequency analysis yields the value of the frequency difference error. Based on the proposed method, the SAR image is improved. The effectiveness of the method is verified by processing the real SAR data.
- High Resolution and Wide Swath SAR (HRWS-SAR),
- Bandwidth synthesis,
- Frequency difference drift,
- Interferometric phase,
- Coherent accumulation

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References(14)

References

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