Modification of Prototype Fly-By-Wire System to Investigate Fiber-Optic Multiplexed Signal Transmission Techniques.

摘要

A prototype,quad-redundant,fly-by-wire system developed for the Flight Dynamics Laboratory in 1967was modified to incorporate a fiber-optic data transmission link in one of the four channels. All data flowing between one of the elevator actuator channels and its control computer was transmitted on multiplexed optical data busses in serial-bit,serial-work format at a 500-KHz bit rate. The channel capacity was several hundred times greater than the maximum requirement anticipated for fly-by-wire application. The system was mechanized with a 100-foot,fiber-optic cable and miniature optical transmitter and receiver modules,having a total bandwidth capability of about 4.0MHz. System performance was verified,and the compatibility of the optical channel and the other three electrical channels was demonstrated. Various fiber-optic cable jacketing configurations were evaluated,and detailed environmental tests were performed on one type of jacketed cable. (Modified author abstract)