Abstract
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.
Highlights
The Enhanced Loran system is the best land-based backup for space-based satellite navigation systems
Ultra narrow band (UNB) modulation method applied to the applied Enhanced Loran (eLoran) system is as shown in is
The feasibility of this application scheme provides a solution for the increase in the eLoran system data rate, which can increase the current data transmission volume several times compared with the traditional methods like Eurofix or ninth pulse modulation
Summary
The Enhanced Loran (eLoran) system is the best land-based backup for space-based satellite navigation systems This is a key technical means for space-based and groundbased integrated navigation applications. The eLoran system adds a data channel based on the traditional Loran-C pulse signal and conveys basic time, warnings, corrections, and integrity information to the users through modulation methods [4]. The existence of this data channel allows the eLoran system to use non-precision instruments to meet the demanding requirements of aircraft landing, and to safely navigate the ship to the port under low visibility conditions. Improving the data communication capabilities of the eLoran system can be regarded as the technical focus of the next-generation eLoran sytem, this technological breakthrough can strengthen the existing system functions, and meet more application requirements in the future, which has important theoretical and practical value
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