广义解析式粗对准误差分析与方案优化

基于凝固惯性系的广义解析式粗对准方法在捷联惯导晃动基座粗对准中得到广泛应用。根据对准原理,该文从测量和计算误差2个方面分析了该方法的对准误差,对比分析了陀螺测量误差在传统和广义解析式粗对准中的传播机理,并利用仿真验证了误差分析的结果。针对实际系统中存在干扰加速度,严重影响了粗对准精度,提出了运用低通滤波器和自适应判据消除线晃动干扰,实验表明该方法具有很好的效果。

Error Analysis and Scheme Optimization of Generalized Analytic Coarse Alignment

The inertial concretionary generalized analytic coarse alignment has been widely used in initial alignment of moving base in SINS. Based on the alignment principle, the alignment error was analyzed from two aspects: measuring errors and calculation errors. The error propagation of gyros in the generalized analytic coarse alignment was analyzed compared to the propagation in the traditional analytic coarse alignment. The analysis results were verified by the simulation test. The disturbed acceleration in the real system had a badly impact to coarse alignment accuracy. An optimized scheme with low pass filter and adaptive criterion was proposed to clear the linear vibration interference. The test showed that the optimized scheme could get higher alignment accuracy.