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Keywords = BPL time service

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13 pages, 13923 KiB  
Communication
Design and Performance Evaluation of eLoran Monitoring System
by Chaozhong Yang, Xiaohang Guo, Shifeng Li and Zhaopeng Hu
Appl. Sci. 2024, 14(16), 7350; https://doi.org/10.3390/app14167350 - 20 Aug 2024
Viewed by 1089
Abstract
The monitoring system is one of the indispensable components of the eLoran system, which can monitor the reliability and integrity of the eLoran system. In this paper, an eLoran monitoring system is designed based on the BPL time service system, and an integrity [...] Read more.
The monitoring system is one of the indispensable components of the eLoran system, which can monitor the reliability and integrity of the eLoran system. In this paper, an eLoran monitoring system is designed based on the BPL time service system, and an integrity monitoring method based on the receiver time difference prediction model is designed according to the stability and accuracy of the receiver time difference. The deviation between the solved time difference and the predicted time difference is utilized to assist in integrity monitoring at the user’s end. And the test results show that the monitoring system can effectively determine the signal quality and system health of the eLoran system and provide early warning service for the system performance. Full article
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12 pages, 3728 KiB  
Letter
Experimental Study of a Signal Modulation Method to Improve eLORAN Data Channel Communications
by Chaozhong Yang, Yulin Wang, Shifeng Li and Wenhe Yan
Sensors 2020, 20(22), 6504; https://doi.org/10.3390/s20226504 - 14 Nov 2020
Cited by 8 | Viewed by 2809
Abstract
There are mainly two types of data modulation methods used for enhanced LOng-RAnge Navigation (eLORAN) systems: pulse position modulation (PPM) and supernumerary interpulse modulation (SIM). The typical application for PPM is tri-state PPM (3S-PPM), also known as Eurofix. The typical application for SIM [...] Read more.
There are mainly two types of data modulation methods used for enhanced LOng-RAnge Navigation (eLORAN) systems: pulse position modulation (PPM) and supernumerary interpulse modulation (SIM). The typical application for PPM is tri-state PPM (3S-PPM), also known as Eurofix. The typical application for SIM is ninth pulse modulation. Both of these methods are phase modulation methods. Phase modulation coding, a very mature technology, is used at present. To achieve a better demodulation success rate of eLORAN digital modulation signals at longer distances, a method of using the transmitting station duplex mode to transmit a digital modulation pulse group after LORAN-C transmitting a pulse group is proposed to realize modulation pulse on–off modulation. In this method, a broadcasting experiment was performed on the BPL (The call sign of eLORAN time service system in China) broadcaster station. After monitoring, a good receiving demodulation effect was initially obtained. Full article
(This article belongs to the Section Communications)
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