The communication command fire truck mainly includes two types: one is the communication command fire truck with satellite communication functions such as dynamic communication or static communication, which is mainly composed of satellite communication, short wave radio, ultrashort wave radio, voice communication networking management platform, individual wireless image transmission, computer network and office, centralized control, video and audio, vehicle body modification and other subsystems; The other is an ordinary communication command fire truck only equipped with portable satellite communication device. The main system components include short wave radio, ultrashort wave radio, voice communication networking management platform, individual wireless map transmission, computer network, centralized control, video and audio, car body modification, satellite portable station and other subsystems. The communication command fire truck refitted from the whole bus is shown in Figure 12-10.
Figure 12-10 communication command fire truck refitted from the whole bus
It is composed of mobile communication satellite antenna, RF equipment, baseband modulation and demodulation equipment, satellite terminal equipment, etc. Can realize to
1) Satellite communication subsystem
Satellites transmit RF signals, receive satellite signals, and provide channels for voice, image and data transmission.
2) Ultrashort wave communication subsystem
It includes 350 MHz conventional vehicle radio, vehicle relay station and portable medium turntable, which can form a large-area wireless interconnection communication area on site to realize conventional 350 MHz, 400 MHz or 800 MHz communication.
3) HF radio subsystem
Including digital vehicle mounted HF radio, vehicle mounted antenna and other loading accessories, backpack accessories and GPS receiver, which can establish communication connection with HF base station at any time to achieve interconnection.
4) Communication network management subsystem
That is, the communication networking management platform, including the emergency communication command and dispatching voice interconnection platform, dispatching terminal and software, and various connected voice equipment. It can realize the interconnection between ultrashort wave communication system, short wave communication system, satellite telephone, wired telephone, GSM / CDMA mobile phone, cluster communication systems of various frequency bands and various systems, and realize the networking of cross regional communication command system, as well as wired Unified dispatching and command in wireless environment. Specific functions include:
① Ultrashort wave, short wave, satellite telephone, mixer, GSM / CDMA telephone, etc. ② Interconnection of wireless communication networks.
③ Interworking between telephone and wireless communication network.
④ For the interworking between short wave radio and wireless communication network, when the detachment operates in an area without coverage, short wave can be used as a free communication link to realize remote interworking.
⑤ Interconnection between cluster network and conventional network.
⑥ Dispatching management function.
＠ intelligent voice processing function.
⑧ At the same time, multiple groups of voice interworking.
5) Computer network and office subsystem
It includes Ethernet switch, on-board industrial control computer and multifunctional office all-in-one machine.
(1) Ethernet switch communication commands the Ethernet switch equipped in the fire truck to divide the network equipment in the vehicle into different VLAN network segments. According to the current plan, the satellite equipment is a sub network segment, and other service terminal equipment is transformed into a sub network segment. Wan address is only allocated to satellite modem, IRD, multi-channel demodulator, video and audio conference terminal and other wireless transmission equipment; The LAN address is assigned to application equipment, such as IP voice gateway, codec, industrial computer, data transmission equipment, etc., and static routing is configured between each network segment.
(2) The on-board industrial control computer is equipped with emergency rescue command and dispatching software system to realize on-site data processing (graphic processing and access to fire information network).
(3) The multifunctional office all-in-one machine realizes the office functions of copying, printing, scanning, fax and so on. Local local area network can be formed at the emergency site. Through satellite link, the special fire network can be accessed through the main station of the fire brigade, and office functions such as printing, copying, fax and scanning can be realized on the vehicle.
6) Video and audio subsystem
The video and audio subsystem is mainly composed of image acquisition equipment, image switching equipment, image storage equipment, image display equipment, video and audio terminal equipment, audio equipment, etc. It can collect, store, switch and transmit the video and audio signals at the emergency site, and upload them to the command center of the fire brigade through satellite channel.
(1) Image acquisition equipment includes roof camera, interior camera, rear camera, handheld camera, etc.
(2) Image switching equipment includes video and audio matrix, video and audio distribution amplifier, etc. Among them, the video matrix includes AV matrix and VGA matrix, which can realize the function switching of the whole system.
(3) Image recording equipment includes hard disk video recorder, which can realize the storage function of on-site multi-channel images and multi picture segmentation function of multi-channel images. (4) Image display equipment includes rack mounted 4 combined display, main display, head restraint display, etc.
(5) Video and audio terminal equipment includes video conference terminal, video and audio encoder, VOIP voice gateway, etc. The video conference terminal can realize the on-site command video conference with the command center. The video and audio encoder is mainly used to transmit the on-site image to the command department.
(6) Audio equipment includes wireless speech, mixer, stereo, etc.
7) Individual wireless map transmission subsystem
The whole system is composed of a set of single soldier knapsack transmitter and a set of on-board receiver to form the communication mode of single soldier communication command fire truck, and realize the wireless image transmission between single soldier transmitter and mobile communication command fire truck. When the road condition or environment at the accident site is bad and the on-board image acquisition equipment cannot collect images, a single soldier can carry the wireless image transmission equipment to enter the scene and transmit the collected images to the communication command fire truck through wireless mode.
8) Centralized control subsystem
The centralized control subsystem is composed of a control host, a wireless touch control screen and various interface control equipment. Its main function is to connect a variety of system equipment to a centralized control host. Through the cooperation of software and hardware, the customized operation software interface is used to uniformly control and monitor the status of common equipment on the satellite communication command vehicle, so as to realize image switching, PTZ control, camera control, audio and video recording control, screen control DVD and audio control functions, complete the operation control of each receiving equipment, simplify the work of operators, and ensure the coordinated, normal and efficient operation of all parts of the system.
