A novel tracking algorithm of high date rate DSSS signal for high dynamic satellite communication

摘要

As for the satellite-ground links and inter-satellite links in aerospace communication system, DSSS is widely used to improve the anti-interference capacity of communication links. Due to the far relative distance, channel coding is adopted to reduce BER but causes the non-integer ratio of data-width to pseudorandom code period. Moreover, the high-speed motion of satellites causes tracking pressure in high dynamic environment. Aiming at solving the above problems, the paper proposes a novel tracking algorithm, which realizes the precision tracking of high dynamic carrier. The regenerative bit clock decides the updating time of carrier tracking loop and code tracking loop. The carrier tracking loop is the constitution of series operation of FLL and PLL. The theoretical analysis and results of simulation and measurement both verified the effectiveness of the novel algorithm.