MBOC信号模拟及其性能评估

Simulation and Performance Evaluation of MBOC Signal

在全球卫星导航系统的现代化框架中,MBOC调制信号是新近提出的一种调制方式,将成为GalileoE1OS和GPSL1C的候选信号,因而MBOC数字中频信号的产生对于新的导航信号结构的研究和新一代接收机的研制具有极其重要的意义。对MBOC信号的时域和频域特性进行了理论分析、对其产生方式进行了仿真验证。设计开发了相应的数字中频信号模拟器,生成了CBOC和TMBOC两种实现方式下的MBOC信号,并采用软件接收机进行了闭环测试,得到了预期的结果。

In the framework of the modernization plans of Global Navigation Satellite System, a new Multiplexed Binary Offset Carrier （MBOC） modulation has been proposed as the most possible candidate signal that will be adopted by both GPS L1C and the Galileo E1 Open Serviee （OS） signals. So the generation of the MBOC digital Intermediate Frequency（IF） signal is of great significance for the research of the new structure of navigation signal and the development of new generation receiver. The time and frequency domain characteristics of the MBOC signal and its generation methods are analyzed, simulated and validated. Two kinds of MBOC implementation-the Composite BOC（CBOC） and the Time Multiplex BOC（TMBOC）signals are generated based on a complete self-developed digital IF signal simulator. The signals are tested by a software receiver and the results are as expected.