Squinted TOPS SAR imaging based on modified range migration algorithm and spectral analysis

Jun Yang; Guangcai Sun; Mengdao Xing; Xiang Gen Xia; Yi Liang; Zheng Bao

doi:10.1109/LGRS.2014.2306433

Squinted TOPS SAR imaging based on modified range migration algorithm and spectral analysis

Jun Yang, Guangcai Sun, Mengdao Xing, Xiang Gen Xia, Yi Liang, Zheng Bao

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

For the squinted terrain observation by progressive scans (TOPS) imaging mode, three problems need to be considered: azimuth spectrum aliasing, serious range-azimuth coupling, and azimuth time aliasing after range cell migration correction (RCMC). For these problems, a subaperture imaging algorithm based on the modified range migration algorithm (RMA) combined with spectral analysis (SPECAN) is proposed in this letter. Echo data are properly divided into subapertues so that the 2-D spectrum of each subaperture without aliasing can be obtained; then, the modified RMA is used to perform RCMC; finally, the signal is focused in the Doppler domain by SPECAN and deramping after subaperture recombination. Both simulated and real SAR data in the squinted TOPS mode are used to validate the proposed algorithm.

Original language	English
Article number	6767071
Pages (from-to)	1707-1711
Number of pages	5
Journal	IEEE Geoscience and Remote Sensing Letters
Volume	11
Issue number	10
DOIs	https://doi.org/10.1109/LGRS.2014.2306433
Publication status	Published - Oct 2014
Externally published	Yes

Keywords

Modified range migration algorithm (RMA)
spectral analysis (SPECAN)
squinted TOPSAR
subaperture

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10.1109/LGRS.2014.2306433

Cite this

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title = "Squinted TOPS SAR imaging based on modified range migration algorithm and spectral analysis",

abstract = "For the squinted terrain observation by progressive scans (TOPS) imaging mode, three problems need to be considered: azimuth spectrum aliasing, serious range-azimuth coupling, and azimuth time aliasing after range cell migration correction (RCMC). For these problems, a subaperture imaging algorithm based on the modified range migration algorithm (RMA) combined with spectral analysis (SPECAN) is proposed in this letter. Echo data are properly divided into subapertues so that the 2-D spectrum of each subaperture without aliasing can be obtained; then, the modified RMA is used to perform RCMC; finally, the signal is focused in the Doppler domain by SPECAN and deramping after subaperture recombination. Both simulated and real SAR data in the squinted TOPS mode are used to validate the proposed algorithm.",

keywords = "Modified range migration algorithm (RMA), spectral analysis (SPECAN), squinted TOPSAR, subaperture",

author = "Jun Yang and Guangcai Sun and Mengdao Xing and Xia, {Xiang Gen} and Yi Liang and Zheng Bao",

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language = "English",

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T1 - Squinted TOPS SAR imaging based on modified range migration algorithm and spectral analysis

AU - Yang, Jun

AU - Sun, Guangcai

AU - Xing, Mengdao

AU - Xia, Xiang Gen

AU - Liang, Yi

AU - Bao, Zheng

PY - 2014/10

Y1 - 2014/10

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AB - For the squinted terrain observation by progressive scans (TOPS) imaging mode, three problems need to be considered: azimuth spectrum aliasing, serious range-azimuth coupling, and azimuth time aliasing after range cell migration correction (RCMC). For these problems, a subaperture imaging algorithm based on the modified range migration algorithm (RMA) combined with spectral analysis (SPECAN) is proposed in this letter. Echo data are properly divided into subapertues so that the 2-D spectrum of each subaperture without aliasing can be obtained; then, the modified RMA is used to perform RCMC; finally, the signal is focused in the Doppler domain by SPECAN and deramping after subaperture recombination. Both simulated and real SAR data in the squinted TOPS mode are used to validate the proposed algorithm.

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KW - spectral analysis (SPECAN)

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Squinted TOPS SAR imaging based on modified range migration algorithm and spectral analysis

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Keywords

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