GPS L2C捕获算法研究及性能分析
doi: 10.3724/SP.J.1146.2008.01850
Study on GPS L2C Acquisition Algorithm and Performance Analysis
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摘要: L2C是GPS现代化Block IIR-M卫星发射的一个新民用信号。为了估计GPS L2C的捕获性能，该文首先研究了GPS L2C捕获算法，即本地产生的归零CM，利用FFT快速实现短码的捕获后，利用短码和长码固定的相位关系实现长码的捕获，仿真验证，该方法能够快速实现L2C的捕获；然后利用统计理论分析了L2C码捕获性能，建立了确定接收机抗干扰能力一般方法，该方法可以运用到其它GNSS信号干扰性能的分析中去。Abstract: L2C is a new civilians signal, broadcast by the modernized GPS Block IIR-M satellites. In order to access acquisition performance of GPS L2C signal, the algorithm of L2C signal is discussed firstly in the paper. That is, after acquisition of CM code by using locally generated Return to Zero (RZ) CM code and FFT, the fixed relationships between CM code and CL code are used to realize acquisition of CL code. Simulation shows that this method can complete acquisition of L2C quickly and can be applied to L2C software receiver. Then the performance of this acquisition algorithm is analyzed by using statistical theory. A general method of anti-jamming capability determination is constructed that can be applied into the analysis of the anti-jamming tolerance of other GNSS signals.
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