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| The Research on the Direction of Motion Compensation According to the Narrow Beam and Flat Earth Hypothesis |
| Zeng Le-tian Xing Meng-dao Chen Shi-chao |
| National Key Laboratory for Radar Signal Processing, Xidian University, Xi’an 710071, China |
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Abstract The narrow beam and flat earth hypothesis is a widely used assumption in Synthetic Aperture Radar (SAR) motion compensation. It proposes an approach in dealing with the space variance of the motion errors of the moving platform relative to arbitrary point targets in the scene, which is approximately considered as the space variance of the associated distance of the same range gate in the direction of radar beam center. Based on the narrow beam and flat earth hypothesis, this paper derives an implied conclusion that the optimal direction of motion compensation is perpendicular to the line of sight transmitted from the radar beam center only when the height error exists. This analysis is suitable for both broadside and squinted motion compensation models. Then, the reason of the hypothesis in carrying out motion compensation is presented in detail and its validity is confirmed by means of simulated experiments.
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Received: 29 October 2013
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Corresponding Authors:
Zeng Le-tian
E-mail: zengletianlxm@gmail.com
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2014, Vol. 36 
