What kind of walkie-talkie is suitable for driving?
How TDD-OFDM solutions work:
1. Point-to-point transmission
Manned/ unmanned aerial vehicle transmission system to the communicationcommand vehicle: front staff / unmanned aerial vehicles will be thescene of the real-time transmission of the image to the communicationcommand vehicles, commanders use the command vehicle display system,direct viewing the actual situation, Decision-making and execution. Thistransmission mode is suitable for medium and short distancetransmission, such as road survey, card check, daily patrol, criminalinvestigation and other small-scale tasks used.
2. Relay transmission mode
Thefront-end transmission system of the soldier / communication vehicle /unmanned aerial vehicle is transmitted via the temporary relay to thecommunication command vehicle / airborne platform / suitcase to thecommand section: the individual transmission system can not transmit thesite due to the distance exceeding the man's coverage Audioand video real-time transmission to the communications command vehicle /airborne platform, this time need to increase the temporary relaystation. This model is more suitable for theenvironment more stringent long-distance transmission, such as thebasement inspection, building inspection, tunnel rescue, remote criminalinvestigation.
3. More on the point of transmission
Accordingto the actual situation the commander may need from different angles tounderstand the situation at the same time to make accurate decisions,which requires better equipment compatibility. A communication command vehicle / command can simultaneously receive images from multiple front-end devices. This model applies to metropolitan area network / LAN large-scale operations, such as mass incidents. Major natural disasters.
TDD-OFDM solution networking:
1. Mesh networking
Composedof mesh network digital wireless image transmission, a number of basestations to form a system, front-end collection by the roof PTZ,hand-held camera, the image, audio encoded by digital way through thebase station to the command center.
The remote equipment in the base station can be roaming, without human intervention. Command center can control the remote PTZ, direct communication or transmission of data. The system is shown in the figure.
2. Chain-based networking
Individuals, airborne equipment or vehicle equipment can be self-organizing work. Each device can be used as a base station, the base station indirect transmission. as the picture shows.
TDD-OFDM solution features and benefits:
1, the system transmission for the IP data stream, can achieve a variety of IP applications. Able to dock a variety of TCP / IP protocol based on the system network, such as satellite, fiber, 4G public network
2,can achieve multi-level signal relay, the signal relay after the basicno attenuation, after the signal relay attenuation<1%, the signalerror rate <10-6 (this can break through the wireless transmissiondistance limit, greatly improve the combat radius And combat depth), the specific application can be used inlong-distance signal relay and complex signal transmission, such as thebasement environment.
3, one-click operation that is self-networking
4, you can frequency range, 150MHz ~ 3GHz frequency points are available
5, the network equipment with a flexible, the use of unmanned aerialvehicles transmission equipment, individual transmission equipment,vehicle transmission equipment, relay transmission equipment, can beimmediately formed in the field of land, sea and air three-dimensionalapplication of operational command system.
6. In a single frequency to support two-way communication, high spectral efficiency, 8MHz bandwidth can pass up to 20Mbps.
7. High reception sensitivity, wide network coverage (receivingsensitivity up to -106dBm, 100 meters high to ground transmissionnetwork coverage radius of up to 20km).
8. Flexible allocation of channel resources, to achieve point topoint, point to multipoint, multi-point to multi-point two-waycommunication
9.All intelligent processing, support spectrum intensity perception,according to the scene to adjust the parameters of the equipment toensure optimal at any time.
What is TDD-OFDM? From its comparison with other technologies you can see:
128位 AES 加密
应急通讯能力高 安装简单 机动能力强
高 安装简单 机动能力强
高 安装简单 机动能力强
高 安装简单 机动能力强
高 大于4级中继 无马赛克
中等 2级中继 无马赛克
中等 2级中继 无马赛克
TDD-OFDM solution Scope:
It can beapplied to a large number of images / voice / data between the military,the armed police, the national security, the fire, the air defense, theair defense, the traffic, the maritime rescue, the radio andtelevision, the health and epidemic prevention, the environmentalmonitoring, the oil field, the mine rescue, the security, Transmission, the device can be self-network, but also with the limited network with the use.
Case 1：When theincident occurred and emergency command vehicles and can not reach thescene, the same frequency two-way unmanned aerial vehicles canimmediately take off to reach the scene over the scene, the actualsituation map to the emergency command vehicle commander, commanderthrough no one The loudspeaker on the machine releases the order or reports it to the command center.
Case 2:When thescene of the incident has not yet established a dedicated wirelessnetwork, the unmanned aerial vehicles and emergency command vehicles canbe composed of emergency network, by the emergency command vehiclecommander can be based on UAV aerial incident actual situation throughthe UAV on the speaker Direct command processing.
Case 3: Whenthe scene of the incident away from the command center, but the natureof the event must be reported to the command center in a timely manner,in the public network completely paralyzed, the use of multiple commandvehicles without network center, the video information in time to thecommand center.
Case 4：When thescene in the valley or other long-distance transmission equipment cannot be achieved, you can use two UAVs out of the video signal to thecommand car.