在软件接收机的研究中,为了实现在GPS或者北斗模式下基带对射频前端数据的采集,在Altera公司的Cyclone Ⅲ系列FPGA器件上采用VERILOG语言编写了SPI总线协议,完成了对射频前端芯片GPS/北斗两种工作模式的切换,使基带可以随时获得两种模式下的数据.通过验证,采集来的数据与期望的结果一致.同时为工程设计提供了一种原型,也为进一步的工程开发奠定了基础.%In the study of software recciver, for receiving data from RF front-end in the model of GPS or CNSS, SPI bus protocol is implemented by using Verilog HDL on ALTERA's Cyclone Ⅲ FP(;A platform, and the switch between GPS and CNSS is completed so that the baseband can obtain data from GPS/Compass at any time. The collected data are consistent with expectations through a verification. At the same time, it can be taken as a prototype, which can be used in a further profound exploitation in EDA project.
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