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针对临近空间超高速接收机在高动态环境下存在码片效应和多普勒效应,进而导致直扩信号能量累积受限的问题,提出一种基于粒子群快速离散匹配傅里叶变换的双块补零快速捕获算法.该算法在双块补零算法的基础上引入快速离散匹配傅里叶变换对码片效应和多普勒效应进行联合补偿,并通过粒子群算法进一步优化匹配傅里叶变换的迭代过程.仿真及理论分析表明,该算法能有效解决高动态所造成的累积增益损失,提升双块补零算法在低信噪比时的捕获概率和捕获精度且同时具有较低的运算量.当累积时间为10ms时,运算量为同类算法的46%.
Aiming at the problem of the chip effect and Doppler effect of the near-space ultra-high-speed receiver in high dynamic environment, which leads to the limited energy accumulation of the DSSS signal, a double-block based on fast discrete discrete Fourier transform Zero compensation and fast acquisition algorithm.The algorithm compensates for the chip effect and the Doppler effect by introducing fast discrete matched Fourier transform based on the double block zero compensation algorithm and further optimizes the matched Fourier transform The simulation and theoretical analysis show that the proposed algorithm can effectively solve the cumulative gain loss caused by high dynamic and improve the acquisition probability and acquisition accuracy of the two-block zero-padding algorithm at low signal-to-noise ratio with low computational complexity When the accumulation time is 10ms, the computation amount is 46% of the same algorithm.