高动态GPS/BD在不同姿态下的精度标定方法

Attitudes Accuracy Calibration Method of High Dynamic GPS/BD System

针对高动态GPS/BD制导系统高速运动、旋转、姿态实时变化时,输出的GPS/BD定位精度存在较大误差,动态精度考核不够充分的问题,提出高动态GPS/BD在不同姿态下的精度标定方法。该方法通过卫星实际星历数据和卫星信号模拟器完成高动态GPS/BD在不同姿态下的精度标定。利用基准站采集卫星实际星历数据,将实际星历数据导入卫星信号模拟器;然后根据设计的模拟试验方法,采集高动态GPS/BD输出数据;最后通过联合差分方法对采集的数据进行差分处理,获得高精度的GPS/BD定位数据。实验后处理数据的结果表明,GPS/BD定位系统在不同姿态时定位结果与天线水平时的定位结果存在较大的差异,且通过该方法获得了高动态GPS/BD不同姿态下的定位精度。

Aiming at the problem that the GPS/BD positioning accuracy of the high dynamic GPS/BD system was bound to a large error and the dynamic accuracy assessment was not sufficient when the high dynamic GPS/BD guidance system moving at high speed with attitude changes in real time,a precision calibration method of high dynamic GPS/BD under different attitudes was proposed.The precision calibration of high dynamic GPS/BD under different attitudes was accomplished by using satellite ephemeris data and satellite signal simulator.Firstly,the actual ephemeris data was collected by the reference station and imported into the satellite signal simulator.Then,high dynamic GPS/BD output data was collected according to the designed simulation test method.Finally,the data collected were processed by joint difference method to obtain high-precision GPS/BD positioning data.The post-processing data showed that the positioning results of GPS/BD system at different attitudes were quite different from that of level antenna,and the accuracy data at different attitudes was obtained.