Satellite Positioning Signal Synchronization Technology And Fpga Design

This thesis researches into synchronization techniques of satellite positioning signals in an engineering way. The new method proposed in this thesis of designing 3-rd Costas loop is practical, And the whole baseband circuit is verified by FPGA .The main results are as follows:1.The capture circuit includes 10 frequency channels, and each frequency chinnel includes 30 code channels. The frequency chinnel is used to capture wide Doppler, and the code capture chinnel is used to capture PN code. The circuit has been verified by FPGA.2. The thesis researches and designs a narrow band DLL circuit, the nois band is 20Hz, and the circuit has been verified in matlab and FPGA.3.The carrier wave tracking circuit is a 3rd order digital Costas loop. This digital loop is transformed from analog 3rd order Costas loop, and the parameters of the loop is designed from matlab. Also, the digital 3rd order Costas loop is verified by FPGA.4 The thesis designs an anti-jamming bit synchronization circuit. And the testing result of the whole baseband circuit include capturing circuit, tracking circuit, bit and frame synchronization circuit shows that the system can work well.The baseband circuit designed in this thesis is based on pactical project, so the design method can be derectly used in practical work. And the new design method of 3rd order Costas loop can be used in high dynamic satellite recerver. The thesis is useful for designing ASIC of baseband .