[fpga+gps receiver] detailed design introduction of dual frequency GPS receiver based on FPGA

1. Software version

ISE14.7

2. This algorithm fpga Implementation process

       adopt Xilinx IES Put the designed program in a FPGA（Vertex 4 Development Kit,）. Then use a purchased RF front-end , Connect this FPGA, Make it a complete real-time GPS Receiver . That is to say, after adding the purchased RF front-end and antenna , This design program puts it in FPGA After the board , It can become a real-time , Effective GPS Receiver . The design points are as follows ：

1. Dual channel , I don't know, except L1, And that channel is easier to do , At present, I have these two choices L1＋L2C or L1＋L5. It mainly depends on , That's easy to do , Just do that
2. Doppler frequency range ＋—50 kHz. One thing to pay special attention to is , Setting and consideration of Doppler frequency range , This GPS The receiver shall be able to operate at high Doppler frequency , For example, the receiver is on a low orbit satellite . therefore , In the part of signal tracking, the search frequency interval should be set ＋－50 kHz ( Generally, we use the maximum ＋－5 kHz)
3. Output information , In addition to normal information , It is hoped that the original information can be saved together during signal processing , The information listed here is needed ： Location , Speed , Time , Doppler frequency shift （GPS Receiver each signal channel （ Dual channel &