Part Of Key Techinical Research And Design Of The GPS Receiver Signal Processing System

The GPS Global Positioning system is widely used in location,guidance,and precise time synchronized at present.Through the combine of GPS-OEM board and technology of computer and communication, the user can develop kinds of GSP application systems which meet the specific needs more convenient. This thesis proposed one kind of design of the GPS receiver signal processing system, and conducted the analysis to its key technologies, it has certain practical significance.The thesis first introduced the GPS-OEM board as well as the attachment of the system hardware devices, and then brought the details of realization of the GPS receiver system software part. Under the Visual C++ translation environment, the system used MSComm to realize the serial port communication, carried on the data takeoff and analysis according to the NMEA-0813 data format, established the view platform using the software, obtained the real-time guidance data of the visible satellite, and realized the real-time display function of the guidance data. Then using the drawing function to draw satellite view and the signal-to-noise ratio view,finally completed the design of the main surface. In order to research the GDOP factor's characteristic, I designed the quantitative analysis sub-window of the GDOP factor,it realized the quantitative evaluation function of the GDOP factor under the condition of four-stars satellite.Then the thesis conducted the research and confirmation of the key technical point of the GPS receiver system.Using the real-time extraction guidance data and the quantitative analysis computation functions of the system, gathering data, watching the changing of the number and the geometric distribution of the satellites, then got the curve of the GDOP factor, we can confirm the characteristic of the GDOP factor changing with the number and the geometric distribution of the satellites.The design of system is simple to operate and has strong availability. Under the Visual C++ translation environment, changing the parameters according to the prescribed form, then we can realize the extraction function for different guidance data. And the proof method of the key technical has certain value for experiment of teaching.