| At the present stage,astronautical technology develop rapidly cause the multimode system integrated navigation receiver has been widely used.GNSS(Global Navigation Satellite System)receiver could display more satellites than the singlemode receiver,so how to quickly and efficiently choose one satellite used to locate in these visible satellites has become a key problem of the GNSS receiver.In addition,each satellite between the satellite group need the relative position information,so relative positioning between independent small satellite become inevitable,and the high accuracy ranging between each small satellite is the basis of relative positioning.The main work of this paper are:(1)General Introduce the location principle of the GNSS navigation system,making a general survey of the components of the GNSS system,analyzing the structure and composition of the GNSS signal and illustrating the extraction method of pseudo range observation.(2)From two aspects of 2-d and 3-d analyzes the influence of satellite geometric distribution on the receiver positioning accuracy.(3)Given the current widespread use of GPS navigation services,and independent research and development of beidou navigation system in our country,the article puts forward the applied to the two kinds of rapid selecting-star algorithm of integrated navigation system.After software simulation and experimental data generated by the receiver,prove the feasibility of this algorithm in integrated navigation system.(4)Using MATLAB simulation design the ranging system between the small satellite,and analyzes the ranging result.Ranging is achieved on the basis of GNSS ranging code,measure the PRN code phase of the distance between two satellites.This paper research on raising the GNSS receiver real-time positioning method,and applies ranging code extension of GNSS receiver positioning to small satellite ranging principle,finally provides a method for development and application of GNSS receiver. |
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