多路相干导航卫星信号模拟方法

Simulation of multi-channel coherent navigation satellite signals

为了进一步研究导航测姿中多路相干GNSS信号模拟方法,根据相干信号定义,提出基于矢量投影理论生成相干GNSS信号的方法:给出相干信号模拟器的数学模型,根据矢量投影理论计算延时时间并将其折算到载波与伪码生成模块中,然后给出多路相干GNSS信号的实现原理,最后在GNSS模拟器中实现多路相干GNSS信号。实验结果表明:经由伪距差值分析得到的多路相干GNSS信号延时误差保持在合理范围内,实时动态载波相位差分得到的基线解算结果与设定的基线长度在mm级误差范围内相一致,生成的多路相干GNSS信号能够满足基线解算平台的测试要求,为姿态测量提供前提条件。

In order to further study on the simulation of multi channel coherent GNSS signals, the paper proposed to generate the coherent GNSS signals based on the theory of vector projection according to the definition of coherent GNSS signals： the mathematical model of coherent signal simulator was given, the delay time based on vector projection theory was calculated and converted into the generated module of pseudo-code and carrier, thus the schematic diagram was designed for achieving multi-channel coherent GNSS signalsl finally the multi-channel coherent GNSS signals were achieved in GNSS simula- tor. Experimental result showed that the delay error of multi-channel coherent GNSS signals by analyzing the pseudo-range difference could be in a reasonable range, the baseline solution results obtained by RTK could be consistent with the set baseline length within millimeter range of error, and the generated multi-channel coherent GNSS signals could meet the testing requirements of baseline solution platform, which would provide a precondition for attitude measurement.