通过使用128-ary极地代码改进增强的洛伦系统的数据通信.
Ruochen Jia1, Yunxiao Li1, Daiming Qu1
1School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan 430074, China.
Sensors (Basel, Switzerland)
|August 14, 2025
概括
增强的洛兰 (eLoran) 数据通信现在使用128个极点码,将错误性能提高了9.3dB. 这次升级提高了传输效率,但没有影响eLoran.
科学领域:
- 导航系统工程 导航系统工程
- 信息理论 信息理论
- 数字通信数字通信
背景情况:
- 增强的洛兰 (eLoran) 是全球卫星导航系统 (GNSS) 的关键地面备份.
- 传统的eLoran数据通信使用了Reed-Solomon (RS) 代码,其错误性能低于最佳.
- 128-ary脉冲位置调制 (PPM) 方案是eLoran定位功能的组成部分.
研究的目的:
- 建议用128ary极点代码取代eLoran中的传统RS代码.
- 开发一种软软 (SS) 解调方法,用于有效的128-ary极码解码.
- 评估拟议方案的错误性能和数据传输效率.
主要方法:
- 实施了一个与现有的128年PPM方案兼容的128年极点代码.
- 开发了一种使用相关接收器的软软 (SS) 解调方法.
- 进行了全面的模拟,以比较拟议中的极点代码与传统的RS代码.
主要成果:
- 与EPD-MD解调的RS代码相比,使用SS解调的128ary极码在0.01FER时实现了9.3dB的增益.
- 拟议的方案显著提高了数据传输效率,在类似的错误率下,数据传输时间减少了2/3或增加了250%的消息位.
- 系统定位能力不受影响.
结论:
- 将RS代码替换为128ary极点代码为eLoran提供了相当大的错误性能改进.
- 开发的SS解调方法有效地支持128个极极码的SCL解码.
- 拟议的方法提高了eLoran数据通信的效率,而不会影响其核心定位功能.
相关概念视频
01:22Polar and Cylindrical Coordinates
15.6K
The Cartesian coordinate system is a very convenient tool to use when describing the displacements and velocities of objects and the forces acting on them. However, it becomes cumbersome when we need to describe the rotation of objects. So, when describing rotation, the polar coordinate system is generally used.
15.6K
01:30Types of Global Positioning System Surveys
120
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
120
01:26Errors in Global Positioning System
112
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
112
01:30Introduction to Global Positioning System
139
The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
139
01:21Pilot and Numeric Relaying
135
Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
135
01:15Receiver Operating Characteristic Plot
332
A ROC (Receiver Operating Characteristic) plot is a graphical tool used to assess the performance of a binary classification model by illustrating the trade-off between sensitivity (true positive rate) and specificity (false positive rate). By plotting sensitivity against 1 - specificity across various threshold settings, the ROC curve shows how well the model distinguishes between classes, with a curve closer to the top-left corner indicating a more accurate model. The area under the ROC curve...
332