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日本采用机械、光学、陶瓷共振、光电摄像等多种方式,对机车和货车车号进行自动或半自动判读、记忆。在实际使用中,这些方式各有优缺点。最近在总结这些经验的基础上,根据铁路运输要求在极其恶劣的气候环境条件下也能正常工作的特点,并结合日本本国的实际情况,又开发成功一种微波数传式车号自动判读记忆系统。该系统由装设在车体上的车上传感器(无源)和装设在进站咽喉点的微波发射器、微电脑及矩阵式天线组成的地上装置构成。系统选用了一般工业用频带(2450±50MHz)作为载波频率,它由该系统的地上设备产生,并通过矩阵天线向车上传感器发送。该载波除供给车上传感器逻辑电路工作的必要电能
Japan uses mechanical, optical, ceramic resonance, optical camera and other means of locomotive and truck number for automatic or semi-automatic interpretation, memory. In actual use, these methods have their own advantages and disadvantages. On the basis of summarizing these experiences recently, according to the characteristics that railway transportation can work normally in extremely harsh climatic and environmental conditions as well as the actual conditions in Japan itself, the United States has developed a successful automated interpretation system system. The system is composed of on-board sensors (passive) mounted on the car body and a microwave transmitter, microcomputer and matrix antenna installed on the laryngeal point of the vehicle. The system selects the general industrial frequency band (2450 ± 50 MHz) as the carrier frequency, which is generated by the system’s ground equipment and sent to the on-board sensors via the matrix antenna. This carrier supplies the necessary power for operation of the onboard sensor logic