【摘要】 GPS的 P码信号具有很强的抗干扰和保密能力 ,实现 P码的直接捕获对 GPS系统的军事用户及我国未来发展自己的卫星定位系统具有重要意义。针对 GPS系统 P码信号多普勒频移大、码周期长和速率高的特点 ,提出了时域 -频域联合、串行 -并行混合的捕获策略 ,介绍时域 -频域联合捕获和串行 -并行混合捕获方法的基本原理和工作方式 ,在此基础上对两方案的捕获性能进行了分析。更多还原

【Abstract】 As GPS P code has a higher tolerance to jamming and spoofing compared with the C/A code,it’s direct acquisition is desirable to GPS’s military users.This is also meaningful for the development of our own satellite positioning system in the future.GPS P code signal has large doppler frequency shift,long code period and high code rate.According to these characters,this paper puts forward a time frequency fields joint and serial parallel hybrid acquisition strategy.Firstly,the paper introduces the principles of this strategy and how it works,then it makes a deep analysis on the performances of this strategy.更多还原