Field programmable gate array (FPGA)-based multi-channel real-time global position system (GPS) tracking method and system
A GPS tracking and multi-channel technology, applied in the field of satellite navigation and positioning, can solve problems such as reduced efficiency, high difficulty in solving, and poor flexibility, and achieve the effects of cost reduction, flexibility improvement, and low cost
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[0041] Platform: The FPGA core chip uses the cyclone III series EP3C40Q240C8, and the system clock is 40MHz.
[0042] Development environment: ModelSim and Quartus, using the hardware description language Verilog, the development process is to use the ModelSim tool to realize the functional simulation of the GPS signal 5-channel parallel tracking system, use Quartus to perform comprehensive layout and wiring of the code, and use the ModelSim tool to perform timing simulation. Download the software to the FPGA hardware platform.
[0043] see figure 1 , GPS baseband signal processing includes two parts: acquisition and tracking. When the satellite number, carrier frequency and initial phase of C / A code in the intermediate frequency signal are obtained during the acquisition process, the tracking loop will start to work, and the C / A code will be generated. According to the results provided by the acquisition, the generator and carrier generator generate effective local C / A code ...
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