Design and Performance Evaluation of eLoran Monitoring System
Abstract
:1. Introduction
2. Principle and Structure
2.1. Principle of eLoran Time Service System
2.2. Near-Field Monitoring Station
2.3. Far-Field Monitoring Station
- The time-frequency traceability keeping unit realizes time traceability to China standard time UTC (NTSC) through BDS (BeiDou Navigation Satellite System) common-view comparison, and provides a high-precision 1PPS reference signal (measurement reference), a 10 MHz frequency standard signal, and UTC time code information;
- The BPL monitoring receiver outputs a 1PPS timing signal, a 10MHz frequency calibration signal, and time code data information by receiving a BPL signal;
- The time interval counter receives the time difference data by measuring the 1PPS and reference 1PPS output from the BPL monitoring receiver, and receives the time code monitoring comparison data by comparing the time code information;
- The monitoring receiver transmits the time difference data and time code data obtained from the measurement comparison to the monitoring data processing center through the network.
2.4. Data Processing Center
3. Near-Field Monitoring Station Performance Analysis
3.1. Transmission Control Precision Calculation Method
3.2. Transmission Control Precision Data Analysis
4. Far-Field Monitoring Station Performance Analysis
5. Integrity Monitoring Analysis
5.1. Time Difference Prediction Model
5.2. Predictive Performance Analysis
5.3. Thresholds for Integrity Judgments
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Serial Number | Location | Distance from BPL |
---|---|---|
1 | Lanzhou | 527 km |
2 | Chengdu | 700 km |
3 | Wuhan | 675 km |
4 | Nanjing | 861 km |
Serial Number | Location | Distance from BPL | STD of TOA |
---|---|---|---|
1 | Lanzhou | 527 km | 16.2 ns |
2 | Chengdu | 700 km | 65.4 ns |
3 | Wuhan | 675 km | 66.6 ns |
4 | Nanjing | 861 km | 70.1 ns |
Serial Number | Location | STD of Actual TOA | STD of Predicted TOA |
---|---|---|---|
1 | Lanzhou | 16.2 ns | 14.5 ns |
2 | Chengdu | 65.4 ns | 54.7 ns |
3 | Wuhan | 66.6 ns | 61.8 ns |
4 | Nanjing | 70.1 ns | 58.2 ns |
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Yang, C.; Guo, X.; Li, S.; Hu, Z. Design and Performance Evaluation of eLoran Monitoring System. Appl. Sci. 2024, 14, 7350. https://doi.org/10.3390/app14167350
Yang C, Guo X, Li S, Hu Z. Design and Performance Evaluation of eLoran Monitoring System. Applied Sciences. 2024; 14(16):7350. https://doi.org/10.3390/app14167350
Chicago/Turabian StyleYang, Chaozhong, Xiaohang Guo, Shifeng Li, and Zhaopeng Hu. 2024. "Design and Performance Evaluation of eLoran Monitoring System" Applied Sciences 14, no. 16: 7350. https://doi.org/10.3390/app14167350