| 摘要: |
| 针对卫星导航信号存在的微小信号畸变，研究了因导航信号畸变而引起的测距偏差的估计问题。基于理想矩形脉冲波形和真实信号波形的上升沿零交叉点信息，给出参考波形定义，并以此为基础估计测距偏差。该方法可用于定量评估卫星导航信号波形畸变对测距偏差的影响及比较卫星之间的测距差异。以二阶模型为基础产生畸变波形，验证了该方法的有效性，并分析了估计精度与信噪比关系。通过大口径天线采集“北斗”卫星B1频点信号，利用该方法获得了B1频点I/Q支路信号的测距偏差，表明该方法可用于在轨卫星信号的测距性能评估。 |
| 关键词: 导航信号 信号质量监测 测距偏差 波形畸变 参考波形 2OS模型 |
| DOI： |
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| 基金项目: |
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| Navigation signal ranging bias estimation using reference waveform |
| LIU Jiancheng,GAO Hao,CAO Zichun |
| () |
| Abstract: |
| Aiming to the tiny distortion of satellite navigation signal,estimation of ranging bias caused by signal distortion is studied. Based on ideal rectangular pulse waveform and zeros crossing points of real signal waveform,a reference waveform is defined. According to the working principle of delay lock loop,a ranging bias estimation method based on reference waveform is proposed,which can be used to quantitatively estimate the impact of waveform distortion on ranging and compare the ranging differences among satellites. Ranging bias of the distorted signal waveform of second-order step(2OS) model verifies that the method is efficient,and relationship between estimation accuracy and signal-to-noise ratio(SNR) is analyzed. Finally the method is applied to collect navigation signals of Beidou or COMPASS satellites,which shows that the method can be used to ranging performance evaluation of in-orbit satellite signals. |
| Key words: navigation signal signal quality monitoring ranging bias waveform distortion refrerence waveform second-order step model |
