Beidou Weak Signal Acquisition Algorithm Based on Envelope Replaced Differentially Coherent Integration

In order to capture the weak reflection signals in the sea non-cooperative detection system using Beidou satellite signals, the paper studied three existing weak signal accumulation techniques and summarized their advantages and disadvantages. In order to make use of the advantages of Differentially Coherent Integration and reduce computational complexity, the paper optimizes the detection of Differentially Coherent Integration and proposes the algorithm of Envelope Replaced Differentially Coherent Integration (ERDCI). Through the analysis of its detection probability and false alarm probability, the proposed algorithm is superior to the original algorithm. The new algorithm is less dependent on hardware and is suitable for use scenarios with limited hardware conditions.