一种INS辅助的PPP周跳探测方法

PPP/INS组合导航系统中，接收机载波相位观测值由于接收机高动态、卫星低仰角、信号被遮挡等原因，往往发生周跳。周跳不仅会影响PPP定位精度，而且可能会导致模糊度参数重新初始化以致数十分钟才能重新收敛。针对以上问题，本文提出利用惯性导航系统（INS）辅助PPP宽巷周跳探测的新策略，通过具有短时高精度的INS信息，消除宽巷组合中的站星几何位置，克服传统MW方法中码伪距噪声及多路径误差的影响。试验表明，INS辅助的宽巷周跳探测方法能够精确识别各种宽巷小周跳。将该方法与无几何距离（GF）组合方法相结合，可以实现对双频等周周跳和特殊周跳（5/4、9/7等）的探测，具有较高探测精度，并可应用于实时周跳探测。

A Method of INS-aided Cycle-slip Detection for PPP

Due to the problem of high receiver dynamics, low satellite elevation, or the obstruction along the signal path, the carrier phase measurements in PPP/INS are often interrupted. Cycle slip will reduce the accuracy of positioning and may force the ambiguities to re-initialize that normally take 10 minutes or more. A new cycle-slip detection method for PPP is presented here utilizing the high-precision INS information, instead of pseudoranges to remove satellites geometric distances in wide-lane combination. This new algorithm is tested in a vehicle experiment and the results show that it has excellent sensitivity to cycle slip even small ones. By combination with the GF method, this method can detect the isoperimetric and special cycle slip pairs (such as 5/4, 9/7) with high accuracy. It can also be used for real-time cycle slip detection.