An Initial Synchronization Method for DGPS Reference Receivers in Noisy Environment

Abstract

The previous initial synchronization method for DGPS reference receivers adopts not only the coherent integration method but also the non-coherent integration method in order to enhance sensitivity under noisy environment. However, under noisy environment, the previous GPS initial synchronization method causes the non-coherent integration loss which is a major factor among losses that can be caused during GPS signal acquisition. The non-coherent integration loss also increases with the strength of the received noise. In this paper, a novel GPS initial synchronization method using differential non-coherent integrator is proposed to effectively enhance sensitivity of DGPS reference receiver under noisy environment. This paper presents that the proposed GPS initial synchronization method suppresses the non-coherent integration loss through post-processing simulation. Furthermore, with regard to the mean acquisition time, it is shown that the proposed GPS initial synchronization method is superior to the previous GPS initial synchronization method.