Communications System Architectures for Autonomous Formation Flight Air Transportation Systems Architecting Brian Wong February 25, 2004
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1 Communications System Architectures for Autonomous Formation Flight Air Transportation Systems Architecting Brian Wong February 25, 2004
2 Agenda General Communications System Architecture Intership Communications Network Architectures Communication Mediums Tested Other Possibilities Management of Communications Failures Selected References
3 Intership Communications Different information required for different types of control: Leader-Following Relative position of leader Follow Preceding Aircraft Relative position of preceding aircraft Positioning relative to imaginary point in formation determined by location of all aircraft (FGC = Formation Geometry Center) Follow a virtual leader Shape of formation (location and flight plan pre-determined) Wake Sensing No intership communication needed
4 Network Architectures Network Topologies Star, Bus, Ring (EMFF), Tree, Star-Bus, Star-Ring, Mesh, etc. Logical Topologies Ethernet, Token Ring (EMFF), FDDI, ATM, LocalTalk, etc. Protocols used in Aviation Comm. Architectures ATN, Internet (UDP, TCP/IP), VDL-2/IP, AMSS/IP, Mode S/IP, etc.
5 Communications Mediums Existing Systems NASA Dryden AFF Wireless LAN Datalink for primary communications Each aircraft determines it s own position via GPS/INS and sends to others Wireless Modem Datalink to determine if aircraft is within range for formation EMFF (SPHERES) RF link for data transfer Each satellite sends its states to others Combination of Ultrasonic and Infrared transmitters and receivers used to calculate distance to other vehicles
6 AFF System Architecture Pilot Interface CPB Differential Carrier Phase GPS & Inter-ship Communication Wireless LAN Datalink Outer-Loop Guidance and Control FFCS FFIS FFIS Multiplex / Filter AMUX ISMS ISMS PSFCC Inner-Loop Control Envelope Monitoring Independent Safety System Wireless Modem Datalink Trail Aircraft Lead Aircraft CPB FFCS AMUX PSFCC PBD Cockpit Interface Source: Larson, G., Autonomous Formation Flight"
7 Communications Mediums Other Possibilities Laser Communications (Lasercom) GalliumArsenide (GaAs) Laser; Data Rate 10Gbps Generally used for long-distance communication for intersatellite links and space-ground communications to replace Ka-band radio. Mode S, VHF, SATCOM Standard channels used to send and receive data on existing aircraft Update rate for Mode S may not be high enough to be useful, but could be used in combination with wake sensing
8 Management of Communications Failures Addressed by Innocenti et al. in Management of Communication Failures in Formation Flight, Journal of Aerospace Computing, Information, and Communication, If an aircraft loses Rx, configuration repositions aircraft to be closer to leader if pre-stored trajectory can still be updated via ground link If complete Rx lost, aircraft must leave formation If an aircraft loses Tx, configuration repositions aircraft to back of formation as it can no longer be a reference to others If leader loses Rx, can still be leader Reconfiguration accomplished through predefined reconfiguration maps
9 Selected References Cobleigh, B., "Capabilities and Future Applications of the NASA Autonomous Formation Flight (AFF) Aircraft", AIAA's 1st Technical Conference and Workshop on Unmanned Aerospace Vehicles, Portsmouth, VA, May 20-23, Giulietti, F., Pollini, L., and Innocenti, M., "Formation Flight Control: A Behavioral Approach", AIAA Guidance, Navigation & Control Conference, Montreal, Canada, August 6-9, AIAA Grappel, R., D., Open System Protocols for Aviation Data Link Applications, AIAA Guidance, Navigation & Control Conference, Monterey, California, August 5-8, AIAA Innocenti, M., Pollini, L., Giulietti, F., "Management of Communication Failures in Formation Flight", Journal of Aerospace Computing, Information, and Communication, Vol. 1, Jan
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