Function a. The airborne terminal of the aircraft wide-area monitoring system has independent sensors and multi-mode links. It can be used independently and can also be crosslinked, it only need to provide the installation location on the aircraft for independent use, that is: crosslinking with the airborne computer when crosslinking, while sending independent sensor information,receiving on-board computer information and send it to the ground station, but also receive the control order of the groundstation and passed it to the onboard computer; b. The airborne terminal has the information sensing function of aircraft position,altitude, speed and attitude; c. The airborne terminal has the function of 4G and satellite dual-mode transmission; It can realizewide-area data transmission and reception, and support data upstream/downstream transmission: d. Independent power supply, notcrosslinked with aircraft (Type I terminal) Technical specifications a.Terminal weight: 230g without antenna; 390g with antenna; b.Size (without antenna): length: 100mm: width: 75mm; Height: 20mm; c.Transceiver cycle: 3 to 5 seconds d.Data service: 1.2Kbps-9.6Kbps e.Working frequency band: 1980MHz~2200MHz f.transmission distance: unlimited; g.Power consumption: 3.5W h.Maximum transmit power:33.5±0.5dBm; i.Reception sensitivity: -125dBm@2.4Kbps; j.EVM:<6%; k.Support wide range voltage 9V-36V power supply;