箭载GPS接收机伪距观测量及观测时间修正  

Correction method of pseudorange measurement and observation time for rocket onboard GPS receiver

作　　者：饶爱水[1] 刘冰[1] 胡健[1] 王振平[1] 张龙[1] 

机构地区：[1]中国卫星海上测控部技术部,江苏江阴214431

出　　处：《测绘科学》2016年第8期106-110,81,共6页Science of Surveying and Mapping

摘　　要：针对某型号箭载接收机仅下传信号发射时刻的小数部分而导致地面设备求解伪距时存在整秒模糊度,以及由于伪距测量时标更新频率小于伪距采样频率导致的地面设备定位精度变差与100ms模糊度问题,该文提出了一种伪距观测量及观测时间的实时修正方法。首先,分析运载火箭、GPS卫星以及地球三者之间的位置关系;然后,计算随火箭飞行高度变化的伪距理论值;最后,根据伪距理论值的不同特性,把运载火箭飞行区域划分为4个区域,并针对不同区域设计了相应的实时修正算法。基于火箭飞行实测数据的实验结果表明,该算法能够解决整秒模糊度、100ms模糊度以及伪距观测值与伪距观测时间不一致等问题,最终定位精度也能够满足试验要求。Aiming at the problem of integer ambiguity when calculating pseudorange because of the rocket onboard receiver only reserves the fractional part of GPS signal sending time,and the problem of worse positioning precision and when 100 ms ambiguity the frequency of pseudorange measuring time updating is less than the frequency of pseudorange sampling,a real-time correction method of pseudorange measurement and observation time was proposed.Firstly,the position relation between carrier rocket,GPS satellite and the Earth was analyzed.Then,the theories value of pseudorange which is changing with rocket flight height was calculated.At last,the flight district of carrier rocket was divided to four districts based on the different characteristic of pseudorange theories value,and the real-time correction algorithms were designed in view of different districts.The rocket fly trial data were used to test the correcting algorithm.Experimental results showed that this algorithm could solve the problem of integer second ambiguity,100 ms ambiguity,and the mismatching problem between pseudorange measurement and observation time,which satisfied the positioning precision demand.

关 键 词：GPS接收机 伪距观测量 运载火箭 实时修正 伪距理论值 

分 类 号：P228.4[天文地球—大地测量学与测量工程]