野兽ADS-B项目Koellner_Projekt-ADSB3.pdf

Günter K?llner, DL4MEA, Am Rain 24, 85256 Vierkirche n Project “ADS-B Receiver and Decoder” About 50% of mercial aircraft are transmitti ng their navigation information (position, speed, h eading and more) on 1090MHz. The protocol and format is not encrypted and can be received by everyone. Commercial equipment is available, but very expensi ve. Some new and cheaper equipment is far away from the performance of the SBS-1 Manufacturer: ic Avionics Price around EUR 600,- Günter K?llner, DL4MEA, Am Rain 24, 85256 Vierkirche n What can we see? ? Air traffic up to 275nm distance Günter K?llner, DL4MEA, Am Rain 24, 85256 Vierkirche n What can we see? ? London Traffic (from Andover) Günter K?llner, DL4MEA, Am Rain 24, 85256 Vierkirche n What can we see? ? Ground Traffic Günter K?llner, DL4MEA, Am Rain 24, 85256 Vierkirche n What can we see? ? Rare situations A german air force A310 MRTT tanker practicing refue lling at 20000ft Günter K?llner, DL4MEA, Am Rain 24, 85256 Vierkirche n 1090MHz Radio 1090MHz Radio Channel Channel Users Users 1. Distance Measuring Equipment (DME) used by planes to determine distance to DME relaying stations 2. Traditional Radar (Mark-X, Mode-3/Mode-A, Mode-C) frame just contains altitude the other just squawk identification All diagrams shown are just amplitude of transmissi on, there is no secondary modulation like FM or PSK based (Uplink is PSK) Günter K?llner, DL4MEA, Am Rain 24, 85256 Vierkirche n 1090MHz Radio 1090MHz Radio Channel Channel Users Users 3. Mode-S a. Interrogated by ground station 1. DF0 (56 Bit) ? ACAS (general) ? TCAS (as one sort of ACAS) 2. DF4 (56 Bit) rollcall reply: altitude (100ft resol ution) 3. DF5 (56 Bit) rollcall reply: squawk 4. DF11 (56 Bit) transponder capabilities 5. DF16 (112 Bit) never observed 6. DF20 (112 Bit) rollcall reply: altitude (25ft reso lution) + BDS registers (Mode-S enhanced surveillance EHS) 7. DF21 (112 Bit) rollcall reply: identity + BDS registers (Mode-S enhanced