一种基于P码的频域直接捕获算法的研究

GPS(Global Positioning System)系统采用典型的CDMA(Code Division Mutiple Access)体制,目前扩频PRN码主要是用于标准定位服务的C/A码和用于精确定位服务的P码.P码信号具有很强的抗干扰和保密能力,而P码的捕获通常是利用C/A码来完成的,因此,实现P码的直接捕获对我国未来发展自己的卫星定位系统具有重要意义.本文从研究信号直接捕获算法角度出发,提出了一种新的P码快速直接捕获算法,并通过仿真实验验证了算法的有效性.仿真结果表明,该算法有效地提高了捕获效率.

Research of a Method of Direct Acquisition Based on P Code in Frequency Domain

As the typical CDMA application,the spread spectrum PRN codes in GPS are C/A code applied to standard positioning service and P code applied to precise positioning service presently. P code has a higher tolerance to jamming and spoofing compared with the C/A code, but P code is usually acquired depending on C/A code, so P code direct acquisition should be implemented which is meaningful for the development of our own satellite positioning system in the future. A new P code direct acquisition algorithm is proposed by studying signal direction acquisition algorithms and its validity is shown by a simulation experiment. The Results show that the new algorithm improves the acquisition efficiency.