Process And Research On Signals Coming From GNSS Basing On Software Radio IF Receiver

Based on the Software Radio framework succeeed used in 3G mobile communication systems, the thesis introduce the framework in the receiver research of the Satellite Positioning and Navigation system, give emphasis to the application of DDC and DSP, This thesis studies the Satellite Positioning and Navigation system by the application of Software Radio framework. An efficient hardware and software module of the receiver of this system is put forward and some useful study results are obtained. it probes into several kinds of common sampling in SDR, compares and analyzes their each characteristic. Then, it discusses multi rate digital signal process (MRDSP) technology in SDR, emphasis is put on the analysis of band pass signal orthogonal sampling structure. Digital signals received from satellites are simulated and processed. Present a kind of scientific software module map. Employ the software of MATLAB and LAB Windows/CVI to resolve some problems that refer to simulate demodulation and recover spread spectrum signal, and present relevant arethmetic.Moreover, this paper explores how to make use of DSP, CPLD, Digital down conversion (DDC) device, ect, to design and construct a software-defined radios(SDR) IF receiver which can carry out the demodulation function of PSK signal if PSK demodulation program is downloaded. The study of this paper indicate that the application of digital IF Software Radio framework is practicable in the receiver of the Satellite Positioning and Navigation system. It can provide some reference worth to expand the application field of Software Radio and study the framework of the Satellite Positioning and Navigation receiver system.