卫星导航软件接收机多采样率信号处理技术

Technology of multirate sampling signal processing for satellite navigation software receiver

研究了软件接收机多采样率信号处理技术。采用过采样技术来提高ADC的分辨率,实现对卫星导航微弱信号的检测。提出将软件接收机的软件设计成多采样率处理系统,即在捕获信号前首先对信号进行降速率处理,而跟踪环路工作时,依然采用降速率前的信号。仿真实验证明,该方案既可以提高对卫星导航微弱信号的检测能力,又能实时地实现对卫星导航信号的捕获和跟踪。

The analysis of muhirate sampling signal processing for satellite navigation software receiver is performed. Over-sampling technology is used to improve the resolution of ADC and realize the detection of satellite navigation weak signal. A method of designing the mnltirate sampling processing software system in the software receiver is porposed.That is to say,the down samping processing is used before the beginning of acquisition algorithm.At the same time,the original data is used when the tracking loop is working.Simulation experiment proves that the method could improve the ability of detecting satellite navigation weak signal as well as realize the acqusition and tracking of satellite navigation signal real time.