Research On High Precision Relative Position Measurement Technology For Separation Payload

In recent years,with the continuous updating and development of space technology,the new small satellite formation model has become a trend.One of the key technologies of satellite formation is the high precision measurement of the baseline between satellites.RTK technology(Real-Time-Kinematic,short-term description of real-time carrier phase difference technology)is a dynamic relative positioning technology based on carrier phase information and is one of the mainstream technologies to measure baseline vector between formation satellites.Its ranging accuracy is up to centimeter,which is suitable for satellite formation.This paper first introduces the principle and classification of differential GPS technology,and then introduces the basic principle and mathematical model of RTK technology.One of the core technologies in RTK technology is to solve the ambiguities of double difference model.Based on the research of various ambiguity resolution methods,this paper compares the performance,the application scenarios and the achievability of various methods.And finally the LAMBDA method with relatively good performance is selected.Then an optimization criterion of Tikhonov regularization is studied.This method can effectively suppress the sickness problem of the legal matrix in the original LAMBDA method.RTK technology is implemented in the Andrews mobile terminal in this article.After the selection of the appropriate GPS receiver,the RTK performance of the mobile client in several scenarios has been tested respectively.The results show that the measurement accuracy of the RTK on the mobile phone side can also achieve centimeter level.