【摘要】 提出了一种基于平均相关技术的快速精密的GPS信号C/A码捕获方案,该方案将接收到的中频信号和本地复制C/A码以高采样频率进行采样,然后通过对它们进行平均处理后以1 024点的FFT处理器计算相关能量值。与不经过平均处理的基于FFT的码捕获方案相比,该方案的运算复杂度约为1/22,可实现快速捕获的目的;与捕获精度为半个码片的常用码捕获方案相比,该方案的捕获灵敏度理论上提高约2.2 dB。最后通过仿真验证了该方案的可行性。更多还原

【Abstract】 This paper presented a fast fine C/A code acquisition scheme of GPS signal based on averaging correlation technique.In the proposed scheme,it sampled the received IF signal and the local C/A replica code at a high sampling frequency,then both of them were dealt with averaging process and the value of correlation energy could be calculated by the 1 024-point FFT processor.It reduced the computational complexity in the proposed scheme to about 1/22 compared with the FFTbased code acquisition scheme without averaging process.It could realize the purpose of rapid acquisition.It improved the acquisition sensitivity of the proposed scheme theoretically by about 2.2 dB,compared to the conventional acquisition scheme with acquisition precision of half a chip.Finally,simulations performe to verify the feasibility of the proposed scheme.更多还原