北斗全球短报文和区域短报文接收融合研究

Research on the fusion of Beidou global short message and regional short message reception

为了实现使用一个北斗接收机可以接收在北斗全球组网后提供的B2b、S两个频段不同通信体制的下行信号,让用户可根据自身需求在北斗全球短报文和区域短报文两种业务中进行自由切换。从北斗用户设备小型化、功能多样化以及成本的考虑出发,文中基于软件无线电的思路,设计了一种可将北斗全球短报文和北斗区域短报文两种下行信号兼容接收的方案模型。通过利用两种不同体制数字下变频后的信号,对信号捕获、跟踪两个阶段进行仿真实验,验证了该接收融合方案的可行性。

In order to achieve using one Beidou receiver to receive downlink signals with different communication systems on the B2b and S frequency bands provided by Beidou after the completion of the global network,and users can freely switch them between Beidou global short message and regional short message services according to their own needs. Based on the miniaturization,functional diversification, cost consideration of Beidou user equipment and the idea of software radio,this paper designs a scheme model that can be compatible with the receiving of two downlink signals of Beidou global short message and Beidou regional short message. The feasibility of the receiver fusion scheme is verified by using two different system digital down- converted signals to simulate the two stages of signal acquisition and tracking.