Study on Deep Space Time Registration Method of Integrated Navigation System Based on Celestial Angle and Velocity Mesurement
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摘要:深空测角测速组合导航系统通过测角信息与测速信息融合，获取探测器位置、速度等参数，具有连续、自主、实时、高精度的优点。在深空测角测速组合导航系统多源信息融合过程中，要求各敏感器数据必须是统一时间基准。基于天文测角测速组合导航系统基本原理，阐述了在实际系统中，测角敏感器、测速敏感器由于时间基准误差、采样周期不一致、数据传输时延等都会造成时间不同步，而时间误差对位置和速度测量信息会带来很大的影响。本文分析时间误差在深空测角测速组合导航系统位置估计和速度估计中的作用机理，研究基于内插外推方法的时间配准方法，实现了测角敏感器与测速敏感器量测信息的同步。数学仿真结果表明，内插外推时间配准算法可有效抑制时间误差，提高深空测角测速组合导航系统导航精度。Abstract:Combining the celestial angle measurement with the velocity measurement, the deep space integrated navigation system is derived to determine the position and velocity information of deep space probe. The integrated navigation system has the advantages of continuous, autonomous, real-time and high precision measurement. In the multi-sources information fusion process of the integrated navigation system, an unified time standard of multi-sensor data is required. The basic principle of celestial angle and velocity measurement integrated navigation system is clarified. However, there are many factors will cause time asynchrony in the actual system, such as time standard error, sampling period inconsistent, data transmission delay of angle measurement sensors and velocity measurement sensors, which have great influence on the position and the velocity of measurement information. The mechanism of time error in position and velocity estimation of deep space integrated navigation system is analyzed. The time registration method based on interpolation and extrapolation methods is studied, achieving the measurement information synchronization between the angle measurement sensor and the velocity measurement sensor. The simulation results show that the interpolation and extrapolation time registration algorithm can effectively suppress the time error, improve the accuracy of the deep space integrated navigation system.
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