一种GPS三频非差周跳探测相位组合的优选方法研究

ON AN OPTIMUM SELECTION METHOD OF GPS TRIPLE-FREQUENCY PHASE COMBINATION APPLIED TO UNDIFFERENCED CYCLE SLIP DETECTION

基于多频伪距/载波组合周跳探测原理,研究了三频相位组合周跳检验量的优化选取模型,以组合周跳方差最小为标准,组合相位的波长为约束条件,选取得到了一种适用于GPS的线性无关的相位组合作为周跳检验量。利用GPS三频实测数据,对组合检验量探测周跳的性能进行了测试。结果表明,该相位组合法可以有效地探测出各频率发生的周跳。

The model for optimum selection of the test quantities of triple-frequency cycle slip combinations is investigated according to the theory of multi-frequency cycle slip detection. Furthermore, taking the smallest vari- ance of cycle slip as the standard, and the wavelength of phase combination as the constrain condition a linear inde- pendent carrier phase combinations are selected as cycle slip test quantities. By use of the triple-frequency GPS ob- servation data from IGS, the performance of the cycle slip detection combinations is tested. The results show that the combinations proposed could effectively detect cycle slips on every frequency. Consequently, it can play a sig- nificant role in the practical triple-frequency GPS data pre-processing.