The circular correlation can raise capture speed but increase the consumption of hardware resources. This paper proposed a circular correlation algorithm of average sampling with spectrum interception. The input signal and the local signal were re-sampled averagely into smaller modules for FFT calculation, then the calculation results were intercepted through the application of spectrum characteristics,at last,the captivity of C/A code was fulfilled by circular correlated calculation. Matlab simulation results showed that the initial position and carrier of the input signal C/A code could be obtained by this method, and could reduce the amount of computation and meet high dynamic receivers＇ real time demands.%针对循环相关法捕获速度加快但是硬件资源消耗大的问题,提出了平均采样与频谱截取相结合的循环相关改进算法.该方法先将输入信号和本地生成信号分别平均分组重采样,以更小的模块进行FFT计算,再利用频谱特性对FFT的计算结果分别截取频谱分量,最后经过循环相关运算完成C/A码捕获.Matlab仿真结果表明:通过该方法可以得到输入信号的C/A码初始位置和载波载频,降低了运算量,更好地满足高动态接收机的实时性要求.但降低了信噪比,使幅值有所下降,抗噪声能力稍微减弱.
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