| 摘要: |
| 为满足轨道交通高精度、宽速域、高可靠的列车测速需求，解决测速雷达速度突变问题，提出并实现了一种24 GHz+77 GHz双频段高冗余列车多普勒测速雷达方案。该雷达具有冗余性高、抗扰能力强、测速范围宽，以及适用交通制式广等技术优势。完成了测速雷达双频测速子系统的冗余设计，通过主备双系DSP芯片分别进行数字信号处理，利用嵌入式微机电系统加速度计实现通过加速度进行辅助停稳判断及速度修正的功能，并实现双系逻辑冗余功能软件设计。通过室内雷达目标模拟器及外场测试，证明该测速雷达能够实现0~650 km/h速度范围内的列车速度精确识别，在列车低速运行情况下测速雷达抗扰能力强，能有效解决目前列车低速状态速度突变问题。对比其他方法，在低速状态下，测速误差降低了57.14%；在列车速度高于50 km/h时，测速误差降低了30%。 |
| 关键词: 列车测速 多普勒雷达 双频雷达 架构设计 微机电系统（MEMS） |
| DOI：10.20079/j.issn.1001-893x.231017003 |
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| 基金项目:中国铁道科学研究院集团有限公司科研项目(2020YJ043) |
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| Design and Implementation of a Dual-frequency High Redundancy Train Doppler Speed Measurement Radar |
| PENG Zezhou,GAO Hongmin,LI Bo |
| (1.Postgraduate Department,China Academy of Railway Sciences,Beijing 100081,China;ぁ糐P3〗2.Signal and Communication Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China) |
| Abstract: |
| In order to meet the high accuracy,wide speed area and high reliability train speed measurement requirements of rail transit and solve the problem of speed abrupt change of speed measurement radar,a 24 GHz+77 GHz dual-frequency highly redundant train Doppler speed measurement radar scheme is proposed and implemented.This radar has the technical advantages of high redundancy,high disturbance immunity,wide speed measurement range,and being applicable to a wide range of rail transit systems.The redundancy design of the dual-frequency speed measurement subsystem of the speed measurement radar is completed,the digital signal processing of Doppler signal is carried out by dual-series digital signal processor(DSP),and the embedded micro-electro-mechanical system(MEMS) accelerometer is used to realize the function of auxiliary stopping judgment and speed correction through acceleration,and the software design of dual-series logic redundancy function is realized.Through indoor radar target simulator and field test,it is proved that the speed measurement radar can accurately identify the train speed in 0~650 km/h,and the speed measurement radar has strong anti-interference ability under the low-speed operation of the train,which can effectively solve the problem of sudden change in the speed of the current low-speed state of the train.Compared with that of other methods,the measurement error of the proposed method is reduced by 57.14% at low speed.When the train speed is higher than 50 km/h,the measurement error of this method is reduced by 30%. |
| Key words: train speed measurement Doppler radar dual-frequency radar architecture design micro-electro-mechanical system(MEMS) |
