机载SAR天线相位中心实时姿态获取方法及精度评估  

Real-time Posture Acquisition Method and Accuracy Evaluation of Airborne SAR Antenna Phase Center

作　　者：杨文博 张亚崇[2] 吴亚丽[1] 齐锦锦 YANG Wenbo;ZHANG Yachong;WU Yali;QI Jinjin(Xi'an University of Technology,Xi'an 710000,China;Xi'an Flight Automatic Control Research Institute,Xi'an 710000,China)

机构地区：[1]西安理工大学,西安710000 [2]西安飞行自动控制研究所,西安710000

出　　处：《电光与控制》2021年第11期89-93,共5页Electronics Optics & Control

基　　金：科技部“复杂重型装备定制生产的制造企业网络协同制造平台研发”(2018YFB1703000)。

摘　　要：采用“位置+速度”传递对准方法,对机体结构变形、基准信息延迟两大因素影响天线相位中心(APC)处惯性测量单元(IMU)实时姿态精度的问题进行了仿真研究。明确了主、子惯导坐标系之间的转换关系;获得了这两类因素对于传递对准后APC处子惯导实时姿态信息的影响规律。仿真表明:该匹配算法不适用于机体动态挠曲变形幅值剧烈、变形频率高的情况;此外,基准信息延迟会严重影响“位置+速度”传递对准估计时间和精度性能。因此,在上述两类因素影响严重时,有必要采取结构变形补偿、延迟补救等措施。The "position+velocity" transfer alignment method is adopted to simulate the impact of two factors, airframe structure deformation and baseline information delay, on the real-time posture accuracy of the Inertial Measurement Unit(IMU) at the Antenna Phase Center(APC).The conversion relationship between main and sub inertial navigation coordinate systems is clarified, and the influence rules of these two types of factors on the real-time posture information of the sub-inertial navigation at the APC after transfer alignment are obtained.The simulation shows that: 1) The matching algorithm is not suitable for the case where the airframe has intense dynamic deflection and deformation and with high frequency in deformation;and 2) The baseline information delay may seriously affect the estimation time and accuracy performance of the "position+velocity" transfer alignment.Therefore, it is necessary to make structural deformation compensation and delay compensation and use other measures when the above two factors have serious effects.

关 键 词：合成孔径雷达 结构变形 信息延迟 传递对准 惯性测量单元 天线相位中心 

分 类 号：V448.23[航空宇航科学与技术—飞行器设计]