The Simulation And Processing Of Data In Satellite Navigation Simulation Test System

Satellite navigation simulation test system is an important part in simulation and testingof receiver. It have a significant effect for analysis navigation signals and improvedperformance, etc. The receiver applied to different scenarios on different carriers, thesimulation test system can simulate the signals of different carriers that received at thereceiver antenna in different environments. In this paper, basic reference amount of thesatellite navigation simulation test system was researched, such as coordinates and time;analyzed error model; simulated trajectory of the carrier; processed navigation data.Firstly, introduced the background and current development of domestic and foreign thatresearched the satellite navigation simulation test system.Secondly, introduced the structure of the GPS satellite navigation signals, establish signalgeneration model; researched the main state parameters of simulation test system, such as thetime and error; and establishing the satellite clock error model, ionospheric errors model andtroposphere error model, and focus on ionospheric error simulation and analysis, The result isthe positioning accuracy of the receiver have improved after error correction.Thirdly, research the common coordinate system and transition between a variety ofcommon coordinate system for the navigation and positioning. Modeling the state of motionthat for the simulation test system, and verify whether the trajectory of the system and thereceiver get consistent trajectory.Finally, the data format of the GPS NMEA0183has been described. Measuring theposition of the receiver that in the static state, and processing the navigation data based onmodel of coordinate and time convert by MATLAB. Propose method measuring pseudorange using the dual-frequency technique, and the receiver using second-frequency pseudorangemeasurement. The method can reduce the error caused by the ionosphere.