B1C信号调制实现与性能分析

北斗三号在B1频点采用新一代民用导航信号B1C调制信号。介绍了B1C信号的结构,并采用Simulink实现信号调制,比较信号分量的自相关函数和鉴相器曲线图,并对串行和并行捕获方法下的副峰误捕检测概率以及非匹配接收方法下的相关输出信噪比损失进行了仿真。仿真分析表明,导频分量自相关函数尖锐,鉴相牵引范围更大,串行捕获和并行捕获误捕概率较数据分量减小10%,而非匹配接收情况下的信噪比损失约20 d B,接收性能未能达到预期值,处理方法有待进一步提高。

B1C Signal Modulation Implementation and Performance Analysis

Beidou III system uses a new generation of civil navigation signal B1C to modulate the signal at frequency B1.This paper introduces the structure of B1C signals and uses Simulink to achieve signal modulation.The autocorrelation function and the phase discriminator curve diagram of the B1C signal components are compared.The probability of error acquisition of sub-peaks under serial and parallel acquisition methods and the related output SNR loss under the non-matching receiving method are simulated.The simulation analysis shows that the autocorrelation function of the pilot component is sharp,the range of the phase detection traction is wider,and the probability of false acquisition in serial acquisition and parallel acquisition is reduced by 10%as compared with the data component.The loss of signal-to-noise ratio in the case of non-matching reception is about 20 dB,the receiving performance fails to reach the expected value,and the processing method needs to be further improved.