Rotating Carrier Single Antenna Gps Receiver Signal Analysis And Simulation

With the increase of weapons using GPS to navigate,researches on GPS applied to Defense are made by each country. As for some spin-stabilized weapons, position and attiude can't be determined by GPS receiver due to the signal's changing, under the situation of rapidly-rotating. So, analysis, calculation and simulation of the changed GPS signals with the receiver's rapidly-rotating are made primarily in the thesis.Firstly, basic structure of GPS receiver is introduced in the thesis. The character- istic of GPS signals and the process of receiving and is interpreted. The methods of GPS signals processing is disgussed, includeing techogly of acquisition and tracking.Secondly, the signals of GPS that will change when the GPS receiver rotats at high roll rates is the emphasis on this thesis. So, this thesis makes detailed analysis, calculation and simulation to this changed GPS signals. The mathematical model is built based on movement characteristic of rapidly-rotating and mode of GPS signals transmission. Moreover, the thesis analyzes the property of changed signals caused by Antenna's rapidly rotating in detail , includeing:change of doppler frequency, change of signals phase, change of signals amplitude. Furthermore, according to the result of analysis above,the effect on GPS receiver's positioning that come from Antenna rapidly rotation is pointed out.Finally, simulink is used to simulate the GPS signals under conditions of signle Antenna with rapidly-rotating according to the result of analysis and calculation above. Preliminary verification on the result of simulation is made with the algorithm of acquisition. This simulation will supply advantage conditions to research of GPS receiver in fuze of spinning projectile.