Binary Information Press
As an excellent receiver, USRP2 (Universal Software Radio Peripheral 2) is being widely used as the radio frequency front end of a GNSS software receiver. But some reports showed USRP2 had a poorer SNR performance than some other receivers. This problem restricted USRP2 application and popularity. In this paper, a USRP2-based software GPS receiver was built and tested on its SNR performance. Its SNR was proved to be about 3dB below the theoretical value by the experiment. Then increasing the gain of RF front end and pass-band filtering were tried respectively to find the cause and solve the problem.