Beidou Compatible With The GPS Accept Chanel Design

Satellite navigation systems in military and civilian areas have a wide range of applications.Since the satellite navigation enters into the Chinese market,the United States of GPS satellite navigation system has occupied the vast majority of Chinese market.For military security and market needs,in 2000,in order to take the military security and market needs into consideration,the Beidou navigation test system was built for the first time.After years of research,Beidou has become a relatively complete system.Beidou navigation system has become the fourth largest navigation system after the United States GPS system,Russia’s GLONASS system,the European Union’s Galileo system.Although each individual satellite navigation system has a wide range of application space,a single satellite navigation system has many restrictions in positioning accuracy,anti-jamming and so on,and people begin to pursue multi-system compatibility and interoperability.Multi-system compatible equipment can improve positioning accuracy,meanwhile it can guarantee other systems to continue working when a system failures.With the rapid development of satellite navigation systems,as well as a number of countries for various types of compatible navigation systems have been introduced.China also begins to research the compatibility of Beidou and other multi-navigation system.In this environment,the direction of the research is to design a compatible Beidou,GPS civilian signal dual-channel board-type receiver channel,which can reduce the module size and design costs while achieving Beidou and GPS signal reception.First of all,this paper completes the Beidou and GPS system compatible with the frequency band selection.Then through the analysis of system indicators and the module of the system,finally mature technology superheterodyne structure is used to achieve the research.The main work of the research focuses on the hardware circuit design and debugging,the difficulty is how to use only one channel to achieve the Beidou and GPS signals receiving at the same time.Through the research on the principle of satellite navigation and the key problems of the receiver,this thesis finishes a receiver module with small size,light weight,strong compatibility and technical requirements.The whole receiving channel is about 50 mm in length and 25 mm in width.The function is complete,stable and reliable.The experiment result achieves the expected design target.