星载合成孔径雷达系统偏航控制的精确计算
Precise Computation of Yaw-Steering in Spaceborne Synthetic Aperture Radar System
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摘要: 该文详细推导了星载合成孔径雷达系统中偏航控制角的精确计算公式；由于推导过程中卫星轨道采用了标准的椭圆轨道模型和地球的椭球体模型，从而解决了传统的近似计算方法所带来的残余偏差较大的问题。所得结果普遍适用于不同轨道和雷达参数的星载合成孔径雷达系统。文中同时给出了一种快速的近似计算方法，最后给出了采用TerraSAR-X系统参数时的仿真计算结果。利用该文提出的计算方法，采用偏航控制的多普勒中心校正误差可以达到0.01Hz量级，从而实现了偏航控制的精确计算。
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关键词:
- 星载合成孔径雷达;多普勒中心;偏航控制
Abstract: In this paper, an advanced method in precisely computing of yaw-angle in space-borne Synthetic Aperture Radar (SAR) system is proposed in detail. Standard elliptical orbit model as well as earth ellipsoid model is assumed in the course of development, thus the bias caused by conventional approximation is eliminated. The result of this paper is popular for different kind of space-borne SAR system. A simple algorithm suitable to fast computation for space-born SAR system is also exploited in this paper. The result of simulation in condition of TerraSAR-X system is given in the end. By using the computing method of this paper, emendation error after yaw-steering can be reduced to centesimal Hz level. Thus, precise computation of yaw-steering is successfully achieved. -
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