时滞滤波超紧耦合跟踪环路设计

Time Delay Filtering in Ultra-tightly Integrated Tracking-loops Design

针对惯性导航系统(INS)的引入导致超紧耦合跟踪环路的响应时间常数增大的问题,提出了基于时滞滤波的跟踪环路。介绍INS辅助锁相环环路的数学模型;对INS辅助全球定位系统跟踪环路的误差进行了建模分析,明确了环路跟踪误差与更新时间的相关性;将时滞滤波引入跟踪环路的结构设计中,降低了时间相关性。理论与计算表明,时滞滤波的引入能够明显改善超紧耦合系统中跟踪环路的时间常数,提高跟踪环路的性能。

In order to solve the problem that the constant of systemic response time increases when the inertial navigation system（INS）is adopted in the ultra-tightly integrated tracking-loops,the tracking-loops based on the time delay filtering are proposed.The mathematical model of the INS-assisted phase-locked loop（PLL）is introduced.The error model of INS-assisted global positioning system is founded and analyzed.The relativity between the loop tracking errors and the updating time is defined.The time delay filtering is applied in the structure design of the tracking-loops to reduce the relativity of time.The theory and calculation results prove that,by using the time delay filtering,the constant of the systemic response time is reduced obviously and the property of the tracking-loops is improved.