BART Advanced Automated Train Control (AATC)
From Signal Identification Wiki
- Planned to replace long-troubled BART (Bay Area Rapid Transit, San Francisco) track circuit based designs in a “standalone” manner. Several “kludges” for train separation would be replaced.
- Derived from military vehicle location and comms system by Hughes Aircraft later acquired by Raytheon.
- RFRadio Frequency comms provided location by triangulation plus high speed data comms with trains.
- Turned over to Harmon when Raytheon realized they couldn’t commercialize.
- Many technical issues with translating from surface to subway application.
- Development halted by GE after takeover of Harmon and subsequent customer issues.
- SYSTEM: Advanced Automatic Train Control (BART)
- SUPPLIER(s): Raytheon then Harmon then GE
- STRUCTURE: ISO 7 layer
- MESSAGING STD: Military EPLRS
- MAX BIT RATE: Very high - 128 KBPS
- FREQ BAND: UHFUltra High Frequency (300-3000 MHz) – military 420 MHzMegaHertz (MHz) 10^6 Hz proposed
- RADIO MFGR: Raytheon (for demonstrations)
- COMMS RANGE: Short range multiple TXTransmit/RXReceive for location and data transmission
- COMMS BETWEEN: Among multiple waysides and to trains at all times
- STATUS: Contract cancelled / project abandoned by GE after Harmon acquisition.