Track traffic video monitoring system

Abstract

The invention discloses a track traffic video monitoring system. The track traffic video monitoring system comprises a control end and a plurality of train ends and base station ends. Each train end is provided with a camera, a signal modulator and an emission antenna. Each base station end is provided with a receiving antenna and a multi-path wireless selection unit. When the train end passes a repeated coverage area of two adjacent base station ends, two multi-path wireless selection units compare the strength of received wireless signals with a preset threshold, select to receive the wireless signal higher than the preset threshold and transmit the wireless signal to the control end. When the strength of both wireless signals is lower than the preset threshold, then the two wireless signals are respectively transmitted to the control end, the control end carries out judgment and receiving. The multi-path wireless selection unit of the base station end carries out selection switching and receiving, so that the information transmission amount is reduced, the information transmission efficiency is improved, and the information processing pressure of the control end is relieved; in addition, the track traffic video monitoring system is short in control line, simple in control logic and high in control precision.

Description

technical field [0001] The invention relates to a video surveillance system for urban rail transit, in particular to a rail transit video surveillance system based on terrestrial digital television technology. Background technique [0002] In recent years, with the acceleration of economic development and urbanization, urban rail transit has developed rapidly in major cities across the country. With its outstanding advantages such as convenience, safety, reliability, and strong carrying capacity, it has become an important tool for alleviating urban traffic congestion and realizing The best solution for smooth travel. As a public place with high mobility and high concentration of people, rail transit has many unsafe factors. Therefore, it is necessary to establish a complete and reliable video surveillance system covering trains, stations, and control centers. The existing rail transit video monitoring system generally adopts a number of base stations along the track, and t...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned patent applications still have obvious defects and deficiencies: First, although for the problem of repeated signal reception in multiple vehicle-mounted terminal VRTs and multiple GRT wireless communications, five signal intelligent switching methods have been proposed to ensure data switching without errors or omissions, but the signal The switching is uniformly carried out by the gateway device CDE of the monitoring center, and there are problems such as long control lines, heavy control loads, and large errors

[0005] Second, the data transmission mode in the vehicle-to-ground wireless communication system includes uplink and downlink data, and the data types include voice, image, instruction, etc. It is not suitable for video surveillance systems that only include uplink data and whose data types are mainly video images. The networking, equipment, and communication methods are too complicated, and the required data transmission speed and reliability have not been given sufficient consideration.

[0006] The third is that the signal carrier frequency of wireless communication adopts the public frequency band, the bandwidth is limited and has been widely used, and it is easy to conflict with the frequency band of external WIFI, cable TV and other signals, resulting in frequency point interference, which affects the quality of information transmission and the safety and reliability of monitoring. sex

[0007] Fourth, the data transmission volume of the video surveillance system is very large (need to transmit a large amount of audio and video data), and the real-time requirements of data transmission are high, and based on high-speed movement (the train speed can reach 150km / h or even higher), the vibration amplitude is large And other harsh communication conditions, so there are special requirements for the networking and hardware performance of the video surveillance system, and the wireless communication system of the above-mentioned patent application obviously does not consider the hardware configuration based on the special needs of the video surveillance system

Images