微弱GPS信号捕获算法的研究

Research of Acquisition Algorithm of Weak GPS Signal

GPS件接收机在低信噪比的环境中,普通捕获算法不能实现理想的捕获效果。采用增加相干积分时间、处理相干积分后的数据和改进传统非相干算法的方法,显著提高了信噪比,有效地消除了传统非相干算法中的平方损耗。通过对不同的捕获算法仿真比较得出,改进的算法有更强的信号检测能力,处理增益更高。

In the low SNR environments, such as indoor and in forests, common algorithm could not attain ideal acquisition results. By increasing time of coherent integral, processing data of coherent integral and ameliorating traditional non-coherent algorithm, SNR is improved remarkably and square loss of traditional non-coherence algorithm has been eliminated effectively. By comparing with other acquisition algorithms, simulation results denote that the ameliorated algorithm provides stronger capacity of detecting signal and higher processing gain.