National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Sensors (Basel). 2021 Jun 25;21(13):4347. doi: 10.3390/s21134347.
The Enhanced Loran (eLoran) system is valued for its important role in the positioning, navigation, and timing fields; however, with its current modulation methods, low data rate restricts its development. Ultra narrow band (UNB) modulation is a modulation method with extremely high spectrum utilization. If UNB modulation can be applied to the eLoran system, it will be very helpful. The extended binary phase shift keying modulation in UNB modulation is selected for a detailed study, parameters and application model are designed according to its unique characteristics of signal time and frequency domains, and it is verified through simulation that the application of this modulation not only meets the design constraints of the eLoran system but also does not affect the reception of the respective signals of both parties. Several feasible schemes are compared, analyzed, and selected. Studies have revealed that application of UNB modulation in the eLoran system is feasible, and it will increase the data rate of the system by dozens of times.
增强型罗兰（eLoran）系统在定位、导航和定时领域具有重要作用；然而，其当前的调制方法数据率低，限制了其发展。超窄带（UNB）调制是一种具有极高频谱利用率的调制方法。如果 UNB 调制能够应用于 eLoran 系统，将会非常有帮助。本文选择 UNB 调制中的扩展二进制相移键控调制进行详细研究，根据其信号时域和频域的独特特性设计参数和应用模型，并通过仿真验证了这种调制的应用不仅满足 eLoran 系统的设计约束，也不会影响双方各自信号的接收。比较、分析和选择了几种可行的方案。研究表明，在 eLoran 系统中应用 UNB 调制是可行的，它将使系统的数据率提高数十倍。
