Research On B1 Band D2 Beidou Weak Signal Acquisition Algorithm And Verification On FPGA

Satellite navigation has played a very important role in the history of human development.Compass navigation satellite system has been widely used in many industries and residential areas for its unique advantages.Positioning and navigation needs in forest and urban environments are constantly increasing.In these environments,multipath propagation,wall wear and other factors make the power of the received signal greatly reduce.The ordinary Beidou receiver is difficult to capture the correct signal.Therefore,the acquisition of Beidou signal in the weak environment is very important.This thesis mainly studies the acquisition of Beidou D2 weak signal in the B1 band.Based on the deep understanding of Beidou signal structure,the traditional signal acquisition techniques are studied,including serial acquisition algorithm,parallel acquisition algorithm in time domain and parallel acquisition algorithm in frequency domain.The common acquisition method of weak signal include growth integration time and differential coherence integration.The effect of bit inversion on signal acquisition was analyzed.The Time Parallel Acquisition with Bit Transition?TPABT?algorithm was studied and simulated.The simulation results show that the probability of capturing is more than 0.99 in the case of 10^-3 false alarm probability.In the ISE Design Suite 14.7 platform,the Verilog language was used to validate the FPGA design of the TPABT algorithm.Using chipscope completes the validation of TPTAD algorithm in the Xilinx xc7vx485t-2ffg1761 evaluation board.The results meet the design requirements.At present,there are still few researches on Beidou satellite weak signal acquisition technology both at home and abroad.However,the TPABT acquisition algorithm studied in this thesis can be applied to Beidou receiver to capture the weak signals in high-rise buildings and forested areas.It is expected to accelerate the development of BeiDou satellite navigation industry chain.The chain provides better safeguards for applications in the areas of transportation,power,communications and finance.