CalibrateSDR

CalibrateSDR is designed to accurately determine the frequency offset of an SDR via an IQ recording sample. Cheaper SDRs use a low-quality crystal oscillator which usually has a large offset from the ideal frequency. Furthermore, that frequency offset will change as the dongle warms up or as the ambient temperature changes. The end result is that any signals received will not be at the correct frequency, and they would drift as the temperature changes. CalibrateSDR can be used with almost any SDR to determine the frequency offset. As of now, it uses the synchronization channel symbols from DAB+ digital audio stations to determine the offset. The primary focus of this project is to extend the applicability towards more signal standards, so as to make it helpful for the SDR community. As DAB+ is mainly used in Europe, Signal standards like GSM, LTE, NOAA-Weather Satellites, DVB-T (use their sync pulses within the data) can be used. Currently, it uses the pyrtlsdr package, which makes it work with RTL-SDR. Piping the API to work with other SDRs will also make the project have a wide range of applications in the SDR Community.