A Study On GPS Command-and-control System Of Time Synchronization In Millimeter Wave Digital Communication System

With the rapid application of Global Positioning System in the world, especially in the field of communications, the timing system of GPS is required to be more and more accurate. The electro circuit on GPS command-and-control system of time synchronization, which plays an important role in Millimeter Wave (MMW) Spring Frequency Communications, has been designed in this thesis. In addition, the key algorithm for the synchronization of GPS signals, the crucial hardware and software to conduct the calculation has been devised. The main points are as follows:1. DSP is applied to process the chips, and the hardware of GPS receiver module is devised. Besides, Efforts has been put to the design of DSP hardware circuits, including the interface circuit to Synchronization Clock Chip, Serial interface module circuit, and the power supply device.2. Based on the analysis of the application of DSP technique on the software developing methods and GPS navigation text of a telegram, the calculation of time, driving of microsecond-scale clock chip, and programming of interrupting the sub-program service are fulfilled. By means of subdividing time of the microsecond-scale chip, and outputting the subdivided time pulse, time precision of the spring frequency in communications has been guaranteed by applying DSP.