A New Prompt 2-D Attitude Steering Approach for Zero Doppler Centroid of GEOsynchronous SAR
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摘要:
该文针对地球同步轨道合成孔径雷达(GEOSAR)提出一种新的2维俯仰–滚动姿态导引方法，可有效解决传统2维偏航导引方法用于GEOSAR时大偏航角的问题，更适用于具有大功率、大天线和大转动惯量的GEOSAR卫星。该方法应用于GEOSAR卫星时，不需调整偏航角，仅通过调整不超过±8°的俯仰角和滚动角，即可实现正侧视。相较于传统导引方法，该方法将卫星机动角度和时间减小至1/10左右，可大幅降低GEOSAR工程实施难度。该方法应用于不同轨道高度的SAR卫星时，均可实现残留多普勒中心值为0，具有普适性。此外，针对不同轨道高度SAR卫星，该文提出了姿态导引方法选择的参考依据。
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关键词:
- 地球同步轨道合成孔径雷达 /
- 残留多普勒中心 /
- 2维俯仰–滚动姿态导引
Abstract:A new prompt 2-D attitude steering approach for zero Doppler centroid of GEOsynchronous SAR (GEOSAR) is proposed. Large yaw angle of GEOSAR in traditional 2-D yaw steering condition can be solved by this method. It is suited to the large satellite such as GEOSAR. The GEOSAR can achieve broadside imaging when this method is applied. Compared to the traditional attitude steering approach, the steering angle and time are just 1/10 of it, and the developing difficulty of GEOSAR becomes lower through this new method. This approach is propitious to GEOSAR. When it is employed to SAR satellites with different altitudes, the residual Doppler centroid is accurate zero in all the conditions. Besides, an attitude selection reference standard is illustrated for different altitude orbital satellites.
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表 1 各轨高SAR卫星仿真参数
参数名称 LEOSAR MEOSAR GEOSAR 轨道高度 (km) 514 12000 35792 轨道倾角(°) 97.42 40 30 轨道偏心率 0.003 0.003 0.003 入射角(°) 45 45 45 近地点幅角(°) 90 90 90 升交点赤经(°) 0 0 0 地球模型 WSG84 WSG84 WSG84 系统波长(m) 0.031 0.031 0.031 
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表 2 GEOSAR从待机状态启动至正侧视成像状态的耗时对比
姿控角速率(°/s) 2维偏航导引(min) 2维俯仰-滚动导引(min) 0.01 125 12.7 0.02 62.5 6.3 0.03 42.7 4.2
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