Research And Realization Of Compass Dual-frequency Navigation Receivers

With the rapid development of our BeiDou industry, the second generation of BD satellite navigation system gains more and more attentions. Traditional single frequency receiver cannot satisfy the market demand. Because of this, this paper dose theoretical research and realization of signal and information processing technology of BeiDou dual-frequency navigation receivers.The paper begins with an introduction of a design scheme of BeiDou dual-frequency navigation receivers, based on the frame of FPGA and DSP in hardware and software, giving the overall framework of receiver, drawing the module of RF front-end diagrams and reference clock figure, then giving the instructions of key chips.In the next part of this paper signal capture of BeiDou dual-frequency navigation receivers are discussed, including BeiDou satellite B1、B2 and B3 three frequency signal structure and characteristic analysis, acquisition algorithm and tracing loop are in detail introduced, after analysis and comparison some acquisition algorithm choosing FFT fast capture algorithm, after expounding the principle of tracking loop, giving the implementation of carrier loop and code loop and related parameters settings.In the last part of this paper, the information processing module of BeiDou dual-frequency navigation receivers are analyzed. Giving the architecture design of this module and introducing several kinds of receiver measurement error, analyzing and comparing dual-frequency ionospheric correction and carrier phase smoothing pseudorange method with traditional single frequency receiver. Considering computation problem of DSP, this subject adopts an algorithm based on sort of elevation and applied in engineering.