GPS接收机钟跳的研究

ON CLOCK JUMPS OF GPS RECEIVER

介绍了GPS接收机的钟跳现象,并从GPS观测模型入手,深入分析了钟跳的基本原理及其对GPS载波相位观测值和伪距观测值产生的影响,同时将其与载波相位观测值的周跳现象进行了比较分析。算例表明,接收机钟跳引起的GPS观测数据跳跃对定位解算没有影响,因此在GPS数据预处理过程中不必对其进行任何改正,而只须将其同周跳现象进行正确的区分处理,从而确保定位解算工作的顺利进行。

On the basis of the GPS observation model, the priciple and the characteristics of the clock jumps of GPS receiver and its effects on the GPS carrier phase observation and GPS pseudorange observation are analyzed. Furthemore, it is compared with cycle slip of GPS carrier phase observation. An example shows that the jump of the GPS data caused by the clock jumps has no effect on positioning calculation. Consequently ,in the course of GPS data preprocess, the clock jumps can be ignored, but the difference between clock jump and cycle slip should be known to ensure that the positioning calculation is correct.