与传统捕获方法相比,P码信号直接捕获具有抗干扰的能力,因此国内外出现很多的P码直接捕获的方法,其中具有一定应用价值的是均值法.首先对P码直接捕获接收机进行系统理论分析,并对均值法原理进行阐述.根据均值法会额外造成信噪比损失的缺点,结合非相关累加的性质提出了基于均值法的自适应直接捕获算法.其后通过理论分析和实验仿真证明此方法仍然可以保留均值法计算量较小的优点,并且克服了均值法无法捕获到较弱信号的不足,对实际P码直接捕获接收机设计具有一定的参考价值.%Compared with traditional acquisition methods, P-code direct acquisition has the advantage of antijamming. Therefore, there have been many new methods for P-code direct acquisition, especially average method has some application value. P code direct acquisition receiver was theoretically analyzed first, and the principle of average method was described. Average method caused additional SNR loss, so an adaptive direct acquisition algorithm which uses none-correlation accumulation was proposed. Subsequently, theoretical analysis and simulation show that this method can still retain the advantages of less computation as average method, and overcome the disability of average direct acquisition for the weaker signal. The adaptive direct acquisition algorithm based on average method has some certain reference value for P code receiver design.
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