椭圆轨道下雷达多普勒特性估计
Radar Doppler Properties Evaluation in Elliptic Orbits
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摘要: 在星载合成孔径雷达中，多普勒特性是决定雷达方位向性能的主要因素，对它的正确估计将影响到雷达的性能和最后成像的精度。该文以椭圆轨道为基础，对不同轨道角度下的多普勒中心频率和多普勒调频斜率进行了估计，考虑了卫星不同姿态误差对它的影响，并也圆轨道下的情况进行了对比。最后讨论了椭圆轨道下零多普勒点的偏角情况。Abstract: For spaceborne Synthetic Aperture Radar (SAR), Dopplcr property is one of the most important factors for azimuth performance. In this paper, the elliptic orbit is applied. The Doppler centroid frequency and Doppler frequency rate are evaluated in different orbit angle with the affection of attitude error considered. And the comparison with circular orbit is given. Finally, yaw steering is discussed.
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