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...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。展开更多
In order to improve the sensitivity of the Compass B1C signal acquisition for the receiver,the principle of constant false alarm rate(CFAR)is applied for the B1C pilot channel acquisition to realize the dynamic adjust...In order to improve the sensitivity of the Compass B1C signal acquisition for the receiver,the principle of constant false alarm rate(CFAR)is applied for the B1C pilot channel acquisition to realize the dynamic adjustment of the threshold of acquisition against the carrier to noise ratio.The non-coherent data/pilot combined acquisition algorithm for B1C signal is analyzed to make full use of the power of the B1C signal under the condition of low carrier to noise ratio.On this basis,to improve the acquisition sensitivity of the receiver,the principle of constant false alarm probability is applied for the non-coherent data/pilot combined acquisition algorithm.Theoretical analysis and simulations show that the non-coherent data/pilot combined acquisition algorithm with CFAR improves the B1C signal acquisition sensitivity of the receiver significantly,and achieves a better Receiver Operating Characteristic compared with the traditional acquisition algorithms.展开更多
文摘北斗三号在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。
基金supported by the Joint Funds of the Ministry of Education of China(No.6141A02022383)the Fundamental Research Funds for the Central Universities of Ministry of Education of China(No.20101195611)
文摘In order to improve the sensitivity of the Compass B1C signal acquisition for the receiver,the principle of constant false alarm rate(CFAR)is applied for the B1C pilot channel acquisition to realize the dynamic adjustment of the threshold of acquisition against the carrier to noise ratio.The non-coherent data/pilot combined acquisition algorithm for B1C signal is analyzed to make full use of the power of the B1C signal under the condition of low carrier to noise ratio.On this basis,to improve the acquisition sensitivity of the receiver,the principle of constant false alarm probability is applied for the non-coherent data/pilot combined acquisition algorithm.Theoretical analysis and simulations show that the non-coherent data/pilot combined acquisition algorithm with CFAR improves the B1C signal acquisition sensitivity of the receiver significantly,and achieves a better Receiver Operating Characteristic compared with the traditional acquisition algorithms.
