A Simple and Reliable Acquisition Algorithm for Low-Orbit Satellite Signal

Abstract

In recent years, the global low-orbit communication and Internet constellation have entered a period of vigorous development. Low-orbit satellites have the advantages of high landing level and fast satellite geometry change, and the enhancement function of low-orbit navigation can complement the current mid-high-rail GNSS implementation and promote the deep integration of navigation communication, which is an important direction for the future development of the navigation system. Hongyan Navigation System is a low-orbit mobile communication and broadband internet constellation independently developed by China, which integrates navigation enhancement functions, and has real-time communication capability in full-time and complex terrain conditions to provide users with real-time global data communication and integrated information services. However, the Hongyan satellite has the characteristics of fast moving speed, short single-visible time, and greater doppler dynamics received by the users, which is not suitable for the traditional capturing methods. Therefore, it is of great research value and practical significance to study the Hongyan navigation signal. This paper studies the spread spectrum modulation and the synchronous acquisition of the transmitting signal based on the Hongyan constellation. On the Matlab platform, the excellent characteristics of the transmission signal of Hongyan system and the time-sequence capture method are verified.