GNSS SDR Signal Generator Implementation Based on USRP N210

Abstract

With the rapid spread of transport systems, testing the performance of GPS signal receivers in transport systems has become a significant research topic, which requires a variety of specific GPS signals for testing. The paper focuses on the implementation of a Global Navigation Satellite System (GNSS) software-defined radio (SDR) signal generator, which is based on the USRP N210 hardware device and supporting code. Through this GNSS signal simulator, two functions are realized: first, for different signal test requirements, different GNSS signal data definition files are generated by software-defined GPS signal simulator; second, the signal data files can load to the radio front end (USRP N210) which can generate physical signals at the correct frequency. Also, the simulation tests reflect the signals created by this GNSS SDR signal generator can stably maintain on different satellite channels.