Research On The Directional Technology Based On Beidou Navigation Satellite System

The BeiDou Navigation Satellite System is of great significance to China's national security and economic development.As a global public resource,it has become popular and plays an irreplaceable role in the fields of transportation,public security,electric power and finance.The direction determination technology of BDS has stood out from many traditional technologies,with unique advantages of all-time,all-weather and high-accuracy.This topic is based on the research of BDS direction determination receiver for the carrier.Firstly,it introduces a dual-antenna BDS direction determination receiver hardware platform,based on System-on-Chip structure.Then,through the research on the carrier direction determination technology,the double-difference carrier phase technique is used to construct the direction determination model of the BDS.Combined with the weighted least squares method,the LAMBDA algorithm,the decorrelation algorithm,and the sequential condition search method,etc.the ambiguity of whole cycles and baseline vectors in the double-difference carrier phase observation equation of the satellite are solved.Use the residual value of the integer ambiguity to examine the obtained integer ambiguity and verify that the integer ambiguity is solved correctly.During this process,it is necessary to detect whether there is a cycle jump phenomenon in real time.Next,transfer the relative positioning results through the coordinate system and use inverse function method to obtain the position angle of the carrier so that the direction determination function for the carrier can be achieved.Program code with MATLAB to realize the simulation and verify the feasibility and correctness of the algorithm.After it,the PL side and PS side of the XC7Z030 chip are designed in the dual-antenna SoC BDS direction determination receiver hardware platform.Program FPGA code on PL side with Verilog HDL language to implement the control of the PS side to the PL side and the interaction between the two.Program the PS side with C language to complete the control and navigation,attitude information solution,and ultimately achieve the carrier direction determination function.Finally test the performance of the direction determination receiver with the BeiDou B1 signal provided by the SPIRENT satellite simulator and the actual antenna.The results show that after the BeiDou satellite navigation and direction determination receiver works stably,the positioning error is less than 5m,the speed error is less than 0.5m/s,and the direction determination error is less than 0.4°.Through analog and actual signal tests,it has been confirmed that the programmable SoC architecture satellite navigation direction determination receiver can achieve accurate positioning and direction determination functions.Furthermore,compared with FPGA+ARM or FPGA+DSP receivers,this type of receiver has the advantages of small size,light weight,low power consumption,and fast processing speed.The design can reduce the receiver's size while improving its performance.