Human-Machine Interaction Program Design And The DSP Algorithm Implementation Of BeiDou Satellite Navigation Simulator

The satellite navigation simulator can accurately simulate the satellite signal received by the receiver,the signal sources include various kinds of complex scene modeling,which can provide real-time signal for production test,teaching demonstration and receiver performance test.The performance of satellite navigation simulator will directly affect the accuracy of navigation,and it is of great significance to resist the foreign technology monopoly and to study the autonomous satellite navigation system.The project studies human-machine interaction program design and the DSP algorithm implementation of BeiDou satellite navigation simulator.The main work includes:1.Design the man-machine interface of satellite navigation simulator.The simulator mainly consists of three modules: remote control,signal setting and database operation.The remote control module realizes the remote control of the vector signal generator through the network protocol and the program control instruction;Signal setting module realizes static and dynamic scene modeling,which provides the initial parameters,ephemeris data and almanac data for DSP module;Database operation module uses database access technology,realizes real-time storages and calls track files,ephemeris files and ephemeris files through database system of remote server.2.Realize the main algorithm of DSP module.The module realizes the time conversion,coordinate conversion,visible star judgment and navigation message generation through local time,the user coordinates,ephemeris and almanac data from the host computer;The spatial propagation error model is established,computation of propagation delay is completed and the simulation of environmental parameters is realized through error model initial parameters of the host computer;Doppler simulation and calculation of satellite state parameters are completed by signal propagation delay,which function as the precise control of the FPGA module.3.The analog signal is tested by the software and hardware receiver,.The verification of the signal simulator is achieved by comparing the test value with the set value.