【摘要】 目前GPS中长码的捕获通常是利用短码来完成。但是,为保证扩频信号具有更高的扩频增益、更强的抗模仿和抗欺骗能力,必须实现长码的直接捕获。在研究以P码信号为例的结构及特性的基础上,分析现今较有效的捕获算法,并提出了一种新的时频域相结合的算法,同时在仿真环境下加以实现,通过实验验证:新的算法能够达到有效的长码捕获,为进一步的工程化实施奠定了基础。更多还原

【Abstract】 Long code is usually acquired depending on short code.But,direct P code acquisition should be implemented in GPS in order to achieve the higher spread spectrum gain,the better anti-deception and anti-spoofing.Basing on researching the structure and the characteristics of P code,the more effective acquisition algorithms were analysed,and a new fast direct acquisition algorithm has been proposed.The new algorithm was designed in simulative environment,which proved such new algorithm is effective algorithm.In the same time,the base of carrying on project is founded.更多还原