A chirp scaling algorithm based on modified range model at apogee in GEO SAR

Ze Gang Ding; Da Cheng Liu; Guan Yu Wang; Wen Fu Yang; Cheng Hu

A chirp scaling algorithm based on modified range model at apogee in GEO SAR

Ze Gang Ding^*, Da Cheng Liu, Guan Yu Wang, Wen Fu Yang, Cheng Hu

^*Corresponding author for this work

School of Information and Electronics

Beijing Institute of Technology

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

Abstract

In geosynchronous synthetic aperture radar (GEO SAR), due to the high orbit curvature, the traditional slant range mode cannot descript the “near-far-near” slant range history at apogee. This paper presented a modified range model in which curvature was negative to descript the range history at apogee in GEO SAR accurately. Based on the modified model, an accurate two-dimension spectrum of GEO SAR echo was obtained. Then, a modified Chirp-Scaling algorithm for apogee in GEO SAR was presented. At the same time, in order to focus wide swath in GEO SAR, the phase error caused by the linear variation of velocity in range direction can be compensated in azimuth processing. Finally, the simulation result of a large scene (100 km×100 km) proves that the CS algorithm based on the modified range model can achieve the focusing image of GEO SAR at apogee.

Original language	English
Pages (from-to)	732-736 and 756
Journal	Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology
Volume	34
Issue number	7
Publication status	Published - 1 Jul 2014

Keywords

Chirp Scaling algorithm
Geosynchronous synthetic aperture radar
Velocity variation

Cite this

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title = "A chirp scaling algorithm based on modified range model at apogee in GEO SAR",

abstract = "In geosynchronous synthetic aperture radar (GEO SAR), due to the high orbit curvature, the traditional slant range mode cannot descript the “near-far-near” slant range history at apogee. This paper presented a modified range model in which curvature was negative to descript the range history at apogee in GEO SAR accurately. Based on the modified model, an accurate two-dimension spectrum of GEO SAR echo was obtained. Then, a modified Chirp-Scaling algorithm for apogee in GEO SAR was presented. At the same time, in order to focus wide swath in GEO SAR, the phase error caused by the linear variation of velocity in range direction can be compensated in azimuth processing. Finally, the simulation result of a large scene (100 km×100 km) proves that the CS algorithm based on the modified range model can achieve the focusing image of GEO SAR at apogee.",

keywords = "Chirp Scaling algorithm, Geosynchronous synthetic aperture radar, Velocity variation",

author = "Ding, {Ze Gang} and Liu, {Da Cheng} and Wang, {Guan Yu} and Yang, {Wen Fu} and Cheng Hu",

year = "2014",

month = jul,

day = "1",

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journal = "Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology",

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TY - JOUR

T1 - A chirp scaling algorithm based on modified range model at apogee in GEO SAR

AU - Ding, Ze Gang

AU - Liu, Da Cheng

AU - Wang, Guan Yu

AU - Yang, Wen Fu

AU - Hu, Cheng

PY - 2014/7/1

Y1 - 2014/7/1

N2 - In geosynchronous synthetic aperture radar (GEO SAR), due to the high orbit curvature, the traditional slant range mode cannot descript the “near-far-near” slant range history at apogee. This paper presented a modified range model in which curvature was negative to descript the range history at apogee in GEO SAR accurately. Based on the modified model, an accurate two-dimension spectrum of GEO SAR echo was obtained. Then, a modified Chirp-Scaling algorithm for apogee in GEO SAR was presented. At the same time, in order to focus wide swath in GEO SAR, the phase error caused by the linear variation of velocity in range direction can be compensated in azimuth processing. Finally, the simulation result of a large scene (100 km×100 km) proves that the CS algorithm based on the modified range model can achieve the focusing image of GEO SAR at apogee.

AB - In geosynchronous synthetic aperture radar (GEO SAR), due to the high orbit curvature, the traditional slant range mode cannot descript the “near-far-near” slant range history at apogee. This paper presented a modified range model in which curvature was negative to descript the range history at apogee in GEO SAR accurately. Based on the modified model, an accurate two-dimension spectrum of GEO SAR echo was obtained. Then, a modified Chirp-Scaling algorithm for apogee in GEO SAR was presented. At the same time, in order to focus wide swath in GEO SAR, the phase error caused by the linear variation of velocity in range direction can be compensated in azimuth processing. Finally, the simulation result of a large scene (100 km×100 km) proves that the CS algorithm based on the modified range model can achieve the focusing image of GEO SAR at apogee.

KW - Chirp Scaling algorithm

KW - Geosynchronous synthetic aperture radar

KW - Velocity variation

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M3 - Article

AN - SCOPUS:84907779959

SN - 1001-0645

VL - 34

SP - 732-736 and 756

JO - Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology

JF - Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology

IS - 7

ER -

A chirp scaling algorithm based on modified range model at apogee in GEO SAR

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