An Accurate Range Model Based on the Fourth-Order Doppler Parameters for Geosynchronous SAR

Author

Bingji Zhao ; Xiangyang Qi ; Hongjun Song ; Wang, Ruiqi ; Yajun Mo ; Shichao Zheng

Author_Institution

Dept. of Space Microwave Remote Sensing Syst., Inst. of Electron., Beijing, China

Volume

11

Issue

1

fYear

2014

fDate

Jan. 2014

Firstpage

205

Lastpage

209

Abstract

This letter presents an accurate range model, named as Doppler parameter range model (DRM), to perform signal processing for geosynchronous synthetic aperture radar (Geo-SAR). Besides that a credible approach, defined as accurate coordinate numeric model (ACNM), is proposed to simulate the raw echo signals. To improve the accuracy of DRM and ACNM, the rotating Earth is modeled as an ellipsoid and the eccentricity of the satellite´s orbit is analyzed. The superiority of DRM that it is more precise than hyperbolic range equation (HRE) and advanced hyperbolic range equation (AHRE), presented before, is illuminated. The point target 2-D frequency spectrum of DRM is derived. Finally, the simulation results validate that DRM and ACNM has a good effect on an L-Band Geo-SAR system with an azimuth resolution around 5 m.

Keywords

Doppler radar; artificial satellites; radar cross-sections; radar signal processing; synthetic aperture radar; 2D frequency spectrum; ACNM; DRM; Doppler parameter range model; L-band Geo-SAR system; accurate coordinate numeric model; eccentricity; ellipsoid; geosynchronous SAR; raw echo signal processing; rotating Earth; satellite orbit; synthetic aperture radar; Doppler parameters; Geo-SAR; point target spectrum; range model; raw echo simulation; the fourth-order;

fLanguage

English

Journal_Title

Geoscience and Remote Sensing Letters, IEEE

Publisher

ieee

ISSN

1545-598X

Type

jour

DOI

10.1109/LGRS.2013.2252878

Filename

6522131