摘要：Currently, 1 bit or 2 bit signal quantization is widely used in satellite navigation software receivers. The bit-wise parallel algorithm has been proposed for 1 bit and 2 bit signal quantization, which performs correlation with high efficiency. In order to improve the performance of the correlator, this paper proposes a new 1.5 bit quantization method. Theoretical analyses are made from the aspects of complexity and quantization loss, and performance comparison between 1.5 bit quantization correlator and traditional correlators is discussed. The results show that the 1.5 bit quantization algorithm can save about 30 percent complexity under similar quantization loss, reduce more than 0.5 dB signal noise ratio（SNR） loss under similar complexity. It shows great performance improvement for correlators of satellite navigation software receivers.

摘要：无线闭塞中心(RBC)是CTCS-3级列控系统的地面核心设备,为保证在RBC的研制阶段,能够进行实验室仿真试验,保证测试结果可靠有效,研究设计车载消息模拟器,模拟车载ATP与RBC间的消息交互,设计划分与其他设备接口连接的4个功能模块,通过每个模块进行仿真研究,并基于C#语言实现具体功能。最后,通过实际测试案例中的RBC移交场景为例,验证该车载消息模拟器能够满足对RBC功能测试的需求,为RBC的设计、研发提供有效的试验环境与方法。