The Key Technology Research Of High Sensitivity GPS Receiver

GPS is a high-precision,all-weather,global satellite navigation and positioning system,it has been widely used in all walks of life.Ordinary GPS receivers deal with the signal with high signal-to-noise ratio in the ideal environment.For the weak signal environment,the accuracy of the ordinary GPS receiver will be greatly reduced and cannot be well applied.And high sensitivity GPS receiver can be very good to deal with weak signals,to overcome the ordinary GPS receiver on the weak signal acquisition,tracking difficulties.Details the key technology of high sensitivity GPS receiver based on FPGA and DSP architecture.FPGA used Xilinx Spartan6 series XC6SLX150 chip,which has low cost and high capacity.DSP used TI's TMS320C6414 chip,this chip can handle a larger amount of data,and you can better handle the complex operation of the navigation information solution.The main task of GPS receiver to complete the weak signal capture and tracking and synchronization processing,at the same time,it shows the positioning process of GPS receiver.Introduces the design of key modules for processing weak signals with high sensitivity GPS receiver.Firstly,through the comparison of several algorithms,the capture module adopts the parallel code phase algorithm with extended coherent integration time,and the tracking loop adopts the method of locking the ring-locked loop to support the phase-locked loop.Secondly,use Matlab simulation compared bit synchronization algorithm and the millisecond data accumulation synchronization algorithm,the simulation results show that the millisecond data accumulation synchronization algorithm with relatively low synchronization error probability is selected in this paper.Finally,the positioning process of the GPS receiver is analyzed in detail.By setting the reasonable pitch angle threshold and the SNR threshold,we can select the satellites that can participate in the positioning,and there may be fault star in the satellite that satisfied the positioning condition.The use of autonomous integrity monitoring algorithm to eliminate fault star,and then finish GPS receiver positioning solution,thereby improving the GPS receiver positioning accuracy.This paper analyzes the performance of high sensitivity GPS satellite navigation receiver at the same time,research on the key technology of weak signal processing on the satellite navigation receiver,completed the acquisition of high sensitivity GPS satellite navigation receiver to the weak signal,tracking and positioning solution.