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稳定回路是平台罗经及惯导系统的重要组成部分,其状态随工作时间的积累而逐渐改变。为了解决稳定回路缺乏有效在线监测手段的问题,采用基于最小方差控制的性能评估方法用于对稳定回路性能进行评估。以方位稳定回路为例,运用Diopphantine恒等式和FCOR(filtering correlation)算法,给出了稳定回路性能指标的计算方法。结果表明,该方法定义的性能指标显著下降时,稳定回路可能存在故障。同时,用自相关系数图法监测稳定回路是否振荡以及计算稳定回路的幅值和相角裕度的变化等方法,证明了该方法的有效性。
Stable loop is an important part of the platform compass and inertial navigation system, and its status gradually changes with the accumulation of working hours. In order to solve the problem of lack of effective on-line monitoring method for stable loop, a method based on minimum variance control was used to evaluate the stability of the loop. Taking the azimuth stabilizing loop as an example, the method of calculating the performance index of the stabilized loop is given by using the Diopphantine identities and the FCOR (filtering correlation) algorithm. The results show that the stability of the loop may be faulty when the performance index defined by this method declines significantly. At the same time, the method of self-correlation coefficient graph is used to monitor the stability of the steady-state loop and to calculate the variation of the amplitude and phase margin of the steady-state loop, which proves the effectiveness of the method.