自适应方差分量估计方法在GPS/GLONASS组合单点定位中的应用

摘要

GPS/GLONASS组合单点定位需要给定合理的观测值权比，不合理的权比会使最小二乘解失去最小方差性质，导致不合理的单点定位结果。利用单频伪距观测值和广播星历数据，比较不同观测值权比下GPS/GLONASS组合单点定位的结果，实现基于Helmert方差分量估计的定权方法和基于自适应方差分量估计的定权方法。通过实例验证这两种方法均可得到合理的定位结果，且基于自适应方差分量估计的定权方法更具有实时性。%GPS/GLONASS combination for point positioning need to be given the reasonable weight ratio of observations, the unreasonable weight ratio will cause the least squares solution lose the minimum vari-ance, lead to unreasonable point positioning. Using single-frequency pseudorange observations and the broadcast ephemeris data, it compares the results of GPS/GLONASS combination for point positioning a-mong different observed values weight ratio and realizes weight determination based on Helmert variance component estimation method and adaptive variance component estimation method. Examples show that two methods can both obtain reasonable positioning results, and the weight determination based on adap-tive variance component estimation has more real-time performance.