Design And Study Of Reconfigurable GPS/BDS Acquisition Module

BeiDou Navigation Satellite System after more than 10 years of development has been gradually improved.As the user terminal core of the receiver from single-mode to multi-mode development.The current dual-mode or even three-mode,four-mode receiver is achieved through the parallel channel to achieve different systems of signal processing,that is,each satellite system has a number of independent signal channels,respectively,at the same time the respective signal processing.At the same time,because it is parallel to the multi-system signal processing,so need to consume a lot of hardware resources;In addition,because the current receiver is mostly based on application specific integrated circuit(ASIC)or general-purpose processor.ASICs are fast,reliable,but less flexible,have to be redesigned when the algorithm changes;the versatility of the general-purpose processor is high,and only one program is needed to modify the program,but the speed is very slow.And reconfigurable technology provides a new direction for solving the above problems.Based on the research of receiver acquisition technology at home and abroad in recent years,the configurability of common algorithms is studied,and the superiority of parallel code phase acquisition scheme based on differential coherent integration is verified.FPGA(Field Programmable Gate array)reconfigurable technology is applied to the receiver capture module,designed a set of its own capture GPS,Beidou signal reconfigurable capture module program to explore the use of FPGA configurability features to achieve the feasibility of the capture module reconfigurable The The main work of this paper includes:1.In this paper,based on the analysis of the status quo of the receiver acquisition algorithm and the present situation of the capture technology,the computational complexity,configurability and capture time of several traditional capture algorithms are studied,and the C/A and the modified C/A code technology is summarized.The scheme of designing the reconfigurable GPS / BDS acquisition module is given.The simulation results show that the proposed scheme is optimal.2.By analyzing the commonality of GPS L1 and Beidou B1 frequency signals,this paper designs a capture module that can configure the circuit parameters so that the hardware circuit has the ability to capture the weak signal,and can quickly capture the strong signal.Overcoming the shortcomings of traditional capture structure flexibility.3.The test platform is built and the functional test and the actual reconfigurable test of the whole system are completed by MATLAB and Xilinx development platform.It isverified that the capture module can be configured flexibly and can be realized by switching to GPS and BDS satellite signals In addition,this paper analyzes and proves that the capture module designed in this paper has some advantages in terms of resource occupancy compared with the traditional receiver acquisition module.