一种基于相位条纹的高精度码相位测量方法

A High-precision Code Phase Measurement Method Based on Phase Strip

全球导航卫星系统(Global Navigation Satellite System,GNSS)接收机在接收卫星信号后,经过捕获、跟踪,得到码相位与载波相位两个基本测量值,然后通过测量值计算卫星与接收机之间的距离。载波相位测量值比码相位测量值具有更高的测量精度,但由于载波相位测量值具有计算整周模糊度的问题,得到高精度的相位测量结果需要付出更多的计算代价。因此,在实际应用中,更高精度的码相位测量结果具有更实际的意义。在相位条纹技术的基础上,通过提取互相关功率谱,提出一种高精度的码相位测量方法,得到高精度的码相位测量值,从而得到更高精度的码伪距测量结果,并通过全球导航卫星系统信号验证了方法的有效性。

After the GNSS(Global Navigation Satellite System)receiver receives the satellite signal,it acquires and tracks the two basic measurement values of code phase and carrier phase.The distance between the satellite and the receiver based on the measured value is calculated.The carrier phase measurement value has a higher measurement accuracy than the code phase measurement value,but because the carrier phase measurement value has the problem of calculating the ambiguity of the whole cycle,actually,the high-precision phase measurement result requires more calculation cost.Therefore,in actual calculations,obtaining a higher-precision code phase measurement result has practical measurement significance.Based on the phase strip technology,this paper proposes a higher-precision code phase measurement method by extracting the cross-correlation power spectrum to obtain a higher-precision code phase measurement value,thereby obtaining a higher-precision code pseudo range measurement result,and verify the effectiveness of this method through actual GNSS signals.