Inter-block Differentially Coherent Integration for GPS L5 signal acquisition

The performance of GPS L5 acquisition is greatly affected by secondary codes, the NH codes with possible bit sign transition every millisecond modulated on the signal, which limits the achievable coherent integration gain. In this paper, a new acquisition method of GPS L5 signal, called Inter-Block Differentially Coherent Integration (IBDCI), is proposed to deal with such problem. The proposed method can be viewed as an extension of the conventional differentially coherent integration, and outperforms other post-correlation integration techniques such as non-coherent integration and conventional differentially correlation integration.