基于一机双天线站间单差的周跳探测与修复

基于对短基线单差模型的分析,使用站间载波相位观测值之差的变化率作为周跳检测量,对该量进行数值估算,分析钟跳对该量的影响,从理论上证明该检测量可用于一机双天线单差短基线解算中的周跳探测,并提出相应的周跳探测与修复方法.采用实测数据进行实验分析,结果表明,对于一机双天线短基线数据,该方法不受钟跳影响,能有效探测和修复周跳.

Detecting and Repairing Cycle slip for Clock Synchronized Dual antenna Global Positioning System Data based on Single differencing between Antennas

Comparing with the conventional double-differencing algorithm, the algorithm of single-differencing between receiver antennas utilizes more observations with less observation noise in solving baseline vectors. In particular, it is able to eliminate both satellite and receiver clock errors simultaneously for the clock-synchronized dual-antenna GPS receiver. Based on the algorithm of single-differencing for short baseline, this paper adopts the rate of phase-differencing between two antennas as the indicator of cycle-slip detection. We estimated the normal range of the rate and examined the effect of clock jump on it. Our theoretical analysis demonstrates that this indicator is able to detect cycle-slip effectively. A numerical method for detecting and correcting cycle-slip is provided. The experiments with real short baseline data from the clock-synchronized dual-antenna receiver showed that this method was valid in detecting and repairing the cycle slips, and it was immune to the disturbance of clock jumps.