通用航空集成航电系统GPS延迟时间的分析

Analysis of GPS Delay Time of General Aviation Integrated Avionics System

针对GPS信号定位延迟的问题,提出一种估算延迟时间的方法。在对延迟时间粗略估计的基础上,将延迟时间分成可测量和不可测量两部分。根据GPS接收时间周期和航电系统服务周期,确定最佳时间延迟计算公式,基于卡尔曼滤波原理估算不可测量时间,对GPS信号延迟进行精确估算。进行仿真实验,验证了该方法计算GPS信号延迟时间的精确性。

Aiming at the problem of GPS signal location delay,a method of estimating delay time is proposed.Based on the rough estimation of the delay time,the delay time is divided into measurable and unmeasurable parts.According to the receiving time period of GPS and the service period of avionics system server,the optimal time delay calculation formula is determined,and the unmeasurable time is estimated based on the Kalman filter principle,so as to accurately estimate the GPS signal delay.Simulation experiments are carried out to verify the accuracy of the method in calculating the delay time of GPS signal.