Absolute Calibration of BOC Navigation Signal Transmission Channel

Abstract

An absolute calibrate of BOC signal transmitting channel on navigation satellite based on software defined radio is addressed. At first, the BOC navigation signal and the pulse per second (PPS) generated by navigation time keeping system are sampled synchronously. After the sampling data of BOC signal is preprocessed, a serial-to-parallel transform is done for the intermediate frequency carried BOC signal data, the high rate data stream is converted into several low rate data streams. Parallel capture of code phase is done and the pesudocode starting point of each data stream can be gotten. With sampling data of PPS, the start points of the absolute delay can be decided. Integrating with the calibration delay of the preprocessing, time division processing, test cables and attenuator, the absolute delay of BOC navigation signal for transmitting channel is obtained. The simulated result indicates the precision of the calibrated algorithm is less than one sample period.