说明：  概述了 GPS[全球定位系统] P码产生原理 ,用 Mat lab 的 m语言实现了 P 码的产 生 ,进而分析了其自相关和互相关特性 ,为进一步研究 P码直接捕获和 P [ Y]码的破译提供了 依据
(Provides an overview of GPS [Global Positioning System] P code generated principle, using the Mat lab language m realize the selection of the P code, and then analyzes its autocorrelation and cross correlation properties, for further study on P code direct capture and P [Y] Code provide a basis for deciphering)