Absolute calibration algorithm of RDSS channel based on software defined receiver

This paper introduces an absolute calibration algorithm of RDSS (radio determination satellite service) channel. The RDSS signal is used as the test signal. The input and output for RDSS are sampled in synchronization. Digital signal processing based on SDR (Software Defined Receiver) has been made with the sampling data of RDSS channel input and output. The high rate data stream is converted into several low rate data streams. The start point of the PRN (Pseudo Random Noise) code for RDSS channel input and output data can be gotten with parallel code phase search acquisition for each low rate data streams. Calculating the delay between the start point of the PRN code for RDSS channel input and output data, and then subtracting the delay of the cables, attenuator and divider, the absolute delay of the RDSS channel can be obtained. The calibration uncertainty of the proposed algorithm is less than 0.21ns when the sampling frequency is 10GHz.