Tracking algorithm of BPSK signal in low bit SNR and high dynamic scenarios

A new tracking algorithm is proposed aiming at the tracking problem in low bit signal-to-noise ratio (i.e., Eb/N0) scenarios, in which the bit clock regenerated by bit synchronization loop decides loop update moment. The double frequency processing and non-coherent accumulation technologies are applied to eliminate the impact of data polarity inversion, and then long time accumulation improves the input signal-to-noise ratio of discriminator. The frequency locked loop and phase locked loop constitute a carrier loop in parallel, which can meet the high dynamic demands. The effectiveness of this algorithm has been corroborated by theoretical analysis, simulation and measurements, and the new tracking algorithm has been used in an aerospace engineering project successfully.