Numerical Analysis of Orbital Perturbation Effects on Inclined Geosynchronous SARReport as inadecuate


Numerical Analysis of Orbital Perturbation Effects on Inclined Geosynchronous SAR


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1

School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China

2

Beijing Key Laboratory of Embedded Real-time Information Processing Technology, Beijing 100081, China





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Author to whom correspondence should be addressed.



Academic Editor: Jason K. Levy

Abstract The geosynchronous synthetic aperture radar GEO SAR is susceptible to orbit perturbations, leading to orbit drifts and variations. The influences behave very differently from those in low Earth orbit LEO SAR. In this paper, the impacts of perturbations on GEO SAR orbital elements are modelled based on the perturbed dynamic equations, and then, the focusing is analyzed theoretically and numerically by using the Systems Tool Kit STK software. The accurate GEO SAR slant range histories can be calculated according to the perturbed orbit positions in STK. The perturbed slant range errors are mainly the first and second derivatives, leading to image drifts and defocusing. Simulations of the point target imaging are performed to validate the aforementioned analysis. In the GEO SAR with an inclination of 53° and an argument of perigee of 90°, the Doppler parameters and the integration time are different and dependent on the geometry configurations. Thus, the influences are varying at different orbit positions: at the equator, the first-order phase errors should be mainly considered; at the perigee and apogee, the second-order phase errors should be mainly considered; at other positions, first-order and second-order exist simultaneously. View Full-Text

Keywords: geosynchronous SAR; orbital perturbation; focusing geosynchronous SAR; orbital perturbation; focusing





Author: Xichao Dong 1,* , Cheng Hu 1, Teng Long 1,2 and Yuanhao Li 1

Source: http://mdpi.com/



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