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Sensors 2016, 16(9), 1420; doi:10.3390/s16091420

Numerical Analysis of Orbital Perturbation Effects on Inclined Geosynchronous SAR

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
*
Author to whom correspondence should be addressed.
Academic Editor: Jason K. Levy
Received: 16 March 2016 / Revised: 23 August 2016 / Accepted: 30 August 2016 / Published: 2 September 2016
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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
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Dong, X.; Hu, C.; Long, T.; Li, Y. Numerical Analysis of Orbital Perturbation Effects on Inclined Geosynchronous SAR. Sensors 2016, 16, 1420.

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