Design And Key Technologies' Research Of Local Punctual Circuit For Navigation Receiver

In recent years, productivity promotes the rapid progress of science and technology industry. As a representative of high-tech, development of satellite technology is changing quicker. GPS (Global Positioning System) made in U.S, is the representative of the application of satellite technology. It was originally conceived for the U.S. military services. With the development of society, satellite navigation systems are coming into the public life widely, people rely on their all kinds of functions, for positioning, navigation, precision timing or other.Especially in the twenty-first century, handheld and automotive satellite navigation system has become very common. Satellite navigation systems have all-weather, high precision, multi-functional characteristics. In traditional applications, the navigation systems can provide people with a wide range of services for navigation and measurement. In addition, satellite accurate time-giving system have adopted as an important way for in many countries. In order to achieve synchronization of the entire communication network, satellite time-giving systems are used for a large number of applications in power system and television broadcast system.This paper is based on satellite time-giving system. It analyzes the punctuality technology and time synchronization methods, and introduces the principle of time-giving system and the composition of the user receiver. Satellite Navigation PPS combines users' receivers with punctual circuit to form high-precision time synchronization system. According to this project, high-precision satellite navigation PPS acts as a kind of time benchmark, and its long-term stability and short-term stability of crystal clock complement each other to give the users the accurate time.In this paper, the circuit based on CPLD of high-precision satellite navigation system receiver is put forward. It combines EDA technology to navigation technology with a systematic design. All the punctuality system adopts modularization design proposal. The combination with VerilogHDL language and QuartusII, it simulate on the functional and timing of sub-modules. The punctuality circuit's design achieves the expected goals, and satisfies with high accuracy receiver of satellite navigation system. Ultimately, it will be applied to the autonomous receivers of satellite navigation system.