小波技术在GPS基线解算数据预处理中的应用

采用小波技术对GPS观测数据进行处理。应用小波变换技术对GPS相位观测值进行周跳的探测和修复。GPS相位观测值可以作为时间序列来进行分析,作为时间函数,它所表现出来的是一条光滑度很好的曲线,一旦出现周跳,这种光滑性就被破坏,从发生周跳的历元开始,后继相位观测值序列发生等量阶跃,通过小波变换的信号特性检测原理,能够有效地探测出周跳的发生,这种方法对于缩小模糊度搜索空间及提高模糊度解的有效性有明显的作用,从而提高基线解算的精度。

The application of wavelet to data pretreatment in GPS baseline solution

The wavelet is used to dispose the GPS observation data.If the GPS phasic observation data can be regarded as time list to analyse,it shows a very lubricous curve.When the cycleslip takes place,the velvet of the curve will be damaged.From the beginning epoch of the cycleslip,the subsequent phasic observation data list takes place equal cycle-slip.According to the principle which wavelet transforms detect signal,it is very effective to detect the cycle slip.This method has obvious function to decrease the scope of searching ambiguity and to improve the validity of the ambiguity,which can improve the precision of the baseline solution.