应答器上行链路信号自适应解调方法

赵会兵; 全宏宇; 梁迪

应答器上行链路信号自适应解调方法

1.
北京交通大学电子信息工程学院，北京 100044
2.
北京交通大学轨道交通控制与安全国家重点实验室，北京 100044

基金项目:

2012X004 铁道部科技研究开发计划项目

详细信息

作者简介:
赵会兵(1970-), 男, 河北怀来人, 北京交通大学教授, 工学博士, 从事列控系统研究

中图分类号: U491.51
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- 被引次数: 0
出版历程
- 收稿日期: 2013-06-17
- 刊出日期: 2013-12-25

Adaptive demodulation method for balise uplink-signal

1.
School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China
2.
State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China

More Information

Author Bio:
ZHAO Hui-bing(1970-), male, professor, PhD, +86-10-62119891, hbzhao@bjtu.edu.cn

摘要

摘要: 分析了应答器上行链路信号特点, 提出一种自适应解调方法对上行链路信号进行信号解调。采用自适应LMS算法跟踪上行链路信号的频率, 计算跟踪误差, 并根据跟踪误差进行信号解调。按照欧洲应答器测试规范对其解调性能进行仿真验证, 并与过零检测法和非相干解调法进行了比较。仿真结果表明: 自适应解调方法在上行链路信号参数存在极端偏移时同样能够满足解调性能要求; 当信噪比为7dB时, 自适应解调方法的误码率接近0, 而过零检测法和非相干解调法的误码率分别为0.163、0.001。自适应解调方法实现简单且具有较强的抗干扰能力, 为应答器在电磁环境相对恶劣的场所中可靠应用提供基础。
- 铁路信号 /
- 列车运行控制系统 /
- 应答器 /
- 上行链路信号 /
- 自适应解调 /
- 抗干扰
Abstract: The characteristic of balise uplink-signal was analyzed. An adaptive demodulation method for balise uplink-signal was introduced. The frequency of uplink-signal was tracked by using adaptive least mean square (LMS) algorithm. The signal was demodulated according to the calculated tracking residual. The demodulation performance was verified according to the Eurobalise test specification and then compared with zero-crossing detection method and noncoherent demodulation method. Simulation result shows that adaptive demodulation method can meet the demodulation performance requirements when there exists extreme migration of uplinksignal. When the signal to noise ratio (SNR) is 7 dB, the error rate of adaptive demodulation method is almost 0, while the error rates of the zero-crossing detection method and the noncoherent demodulation method are 0.163 and 0.001 respectively. The adaptive demodulation method is simple to utilize and has strong anti-interference ability. It provides a foundation for the reliable application of balise in comparative harsh electromagnetic environment.
- railway signal /
- train control system /
- balise /
- uplink-signal /
- adaptive demodulation /
- anti-interference

HTML全文

图 1 应答器信息传输系统

Figure 1. Balise information transmission system

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图 2 应答器动态信号模式曲线

Figure 2. Balise dynamic signal pattern curves

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图 3 实际上行链路信号

Figure 3. Actual uplink-signal

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图 4 局部放大的上行链路信号

Figure 4. Partial enlargment of uplink-signal

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图 5 自适应单频跟踪器

Figure 5. Adaptive single-frequency tracker

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图 6 上行链路信号自适应解调原理

Figure 6. Adaptive demodulation principle of balise uplink-signal

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图 7 通道1、2中值滤波后输出结果

Figure 7. Output results of channels 1and 2after median filtering

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图 8 通道1减去通道2后结果

Figure 8. Result of channel 1minus channel 2

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图 9 自适应解调输出结果

Figure 9. Output result of adaptive demodulation

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图 10 测试案例结果

Figure 10. Results of test cases

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图 11 不同解调方法的误码率

Figure 11. Error rates of different demodulation methods

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表 1 应答器上行链路信号频率参数

Table 1. Frequency parameters of balise uplink-signal

下载: 导出CSV

表 2 八个案例的测试结果

Table 2. Test results of 8cases

下载: 导出CSV

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