Structure of Satellite Navigation Signals

Abstract

This chapter begins with explaining the basic principles of satellite navigation so as to clarify the missions and functions to be carried out by a navigation signal. Then, using the structural elements of satellite navigation signals as the main thread, this chapter systematically expound on the important basic concepts in the design of the signals. We also discuss the effects of various factors on system performance, such as center frequency, transmission power, polarization characteristics, spreading modulation, spreading code, message structure, and the multiplexing of signals. This chapter serves as the basis for subsequent chapters. Since the elements that make up the satellite navigation signal are closely related, the design of many elements of the signal is carried out in the form of trade-offs and compromises. Therefore, it is necessary to have a systematic understanding of the structure of the entire signal before conducting in-depth research on each aspect.