Research On Navigation Data Processing Technology Of GNSS Receiver

With the development of Global Navigation Satellite System(GNSS),multi-constellation integrated navigation has become a development trend.Therefore,research on GNSS receiver navigation data processing technology has become an important work.In this paper,the satellite selection and integrity monitoring data processing algorithm of the integrated navigation GNSS receiver are studied.The specific research contents as:(1)The calculation principle of BDS/GPS navigation and positioning is studied,the time-space compatibility processing of BDS and GPS system is analyzed and the positioning result error is simulated.The Geometric Dilution of Precision(GDOP)is introduced,which describing positioning accuracy.The satellite selection algorithm based on GDOP is introduced and the variation of GDOP with the number of satellite selection is simulated and analyzed.(2)Aiming at the problem that the traditional traversal satellite selection algorithm takes longer to select satellite due to the increase in the number of satellite selected,a particle swarm optimization(PSO)algorithm based on artificial fish swarm algorithm(AFSA)is proposed and combined with the GNSS receiver satellite selection algorithm to establish the AFSA-PSO satellite selection algorithm model.The simulation results show that the AFSA-PSO satellite selection algorithm not only improves the speed of satellite selection,but also ensures the accuracy of satellite selection.(3)Aiming at the relatively conservative allocation of integrity risk(IR)and continuity risk(CR)in the GNSS receiver autonomous integrity monitoring algorithm,the PSO algorithm is applied to the allocation of IR and CR.Based on the BDS/GPS dual constellation simulation,the results show that the optimization scheme optimizes the vertical protection level(VPL),and improves the availability of receiver autonomous integrity monitoring in the user area.(4)Aiming at the integrity requirements of different aviation segments,On the basis of(3),the performance of the receivers autonomous integrity monitoring algorithm for different constellation combinations(BDS,GPS,etc.)is studied The simulation results show more than two constellations can improve the availability of receiver autonomous integrity monitoring algorithms for different aviation flight segments.