独立周跳和非独立周跳在高次差法中的分析

GPS信号在传送过程中,载波相位由于受到信号的遮挡、干扰、接收机故障等原因的影响,引起整周计数部分突变,从而产生周跳。周跳会造成观测数据不准确,直接影响到GPS测量的精度。针对GPS周跳中存在独立周跳和非独立周跳的问题,依据高次差法的特征子序列对非差载波相位进行模拟分析,通过实验研究结果表明:高次差法能有效地探测出间隔2个历元的非独立周跳,但对于间隔3个以上的历元无能为力;连续周跳的情况对高次差法探测周跳的能力没有影响。

Analysis of Dependent and Independent Cycle Slips in the High Difference Method

During the progress of GPS signal transmission,cycle slip will happen to carrier phase due to integer count mutation resulting from signal block,interference,receiver failure and so on.Cycle slips will lead to inaccurate observational datum,directly affect the measure accuracy.Based on the high difference method,this paper took consideration of the existing dependent and independent cycle slips in GPS,carried out simulation analysis on indifferences carrier phase according to the characteristic subsequence of high difference method.The experimental results showed that high difference method could effectively detect an independent cycle slip with 2-epoch interval but be powerless for more than 3-epoch interval.Continuous cycle slip has no affection on the detecting ability by high difference method.