基于FPGA和USB的GNSS中频信号采集器设计

Design of GNSS IF Signal Collection Platform Based on FPGA and USB

以FPGA+DSP经典高速数据采集平台为核心,应用MAX2769射频芯片,实现了通用GNSS中频数据采集器的设计。采集器可以接收各GNSS系统卫星的中频信号并转换成数字中频数据,通过编写USB设备控制程序和上位机人机交互程序,实现中频数据的高速采集、传输和保存,并应用接收到的数据完成频谱分析和信号捕获。实验结果表明,研制的GNSS中频数据采集器能够正确、完整地保存数据,并且数据满足定位要求。

The general GNSS IF data collection is designed with MAX2769 RF chip and classic high-speed data acquisition platform of FPGA ＋ DSP as the core. The IF signal of GNSS satellites can be received and converted into digital IF data. By writing the control programs of USB device and man-machine interface programs in PC, the high-speed data acquisition, transmission and saving of IF data are achieved. The frequency spectrum is analyzed and the signal is captured with the received data. The experimental results show that the GNSS IF data can be saved correctly and completely by using the IF data collection developed in this paper. And the data can satisfy the positioning requirement.