基于高增益接收系统的Galileo E1信号质量评估方法研究

Galileo系统在E1频点采用Interplex调制方式播发导航信号，由于缺乏E1信号功率分配和伪码序列等先验信息，一般的研究人员只能开展有限的信号质量特性研究.针对该问题，提出一套基于高增益天线的空间信号质量评估方法，实现了E1授权信号的解析，完善了E1信号评估体系.运用相关功率法来解决信号分量功率比问题，采用跟踪结果解决相位偏差估计问题，提出加权组合平均和码相位平均相结合的新型时域波形分离方法，克服了电文和码多普勒对时域波形特性评估的影响，采用S曲线过零点偏差（S-curve offset Biases，SCB）等参数进行信号测距偏差定量评估.通过该方法对Galileo GSAT-0214卫星进行了评估，结果显示：该卫星E1各信号分量SCB小于0.2ns，测距性能优异，其复用效率达到了97.8%，优于GPS L1信号和北斗三号系统（BDS-3） B1信号.

Research on Galileo E1 Signal Quality Assessment Method Based on High Gain Receiving System

Galileo system uses Interplex modulation to broadcast navigation signals at the E1 frequency.Due to the lack of prior information such as E1 signal power allocation and pseudo-code sequences,researchers can only carry out limited signal quality characteristics studies.Aiming at this problem,this paper proposes a signal-in-space quality assessment method based on high gain antenna,which realizes the analysis of E1 authorization signal and perfects the E1 signal evaluation system.The related power method is proposed to solve the signal component power ratio problem.The tracking result is used to solve the phase deviation estimation problem.A new time domain waveform separation method combining weighted combination averaging and code phase averaging is proposed,which overcomes the influence of message and code Doppler on time domain waveform characteristics evaluation.The S-curve offset Biases (SCB) parameters are used to quantitatively evaluate the signal ranging deviation.In this paper,the Galileo GSAT-0214 satellite is evaluated by this method.The results show that the signal component SCB of E1 is less than 0.2 ns,and the ranging performance is excellent.The multiplexing efficiency is 97.8%,which is better than GPS L1 signal and BOS-3 system B1 signal.