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Published byBerenice McCormick Modified over 9 years ago
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Real Time Systems Characteristics of Real-Time Systems
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Characteristics - 2 Outline Introduction to an existing RTS the Electronic Support and Training (EST) System The characteristics of real-time software
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Characteristics - 3 Electronic Support &Training (EST)
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Characteristics - 4 EST - Overview provide realistic electronic warfare training to the Air Force, Army and Navy 19 pods for 10 CE-133 T-Bird aircraft ECM, ESM and Chaff pods (off-board ECM) an integrated suite of radar ESM/ECM, communication ESM/ECM and chaff on 3 CE144 Challenger (commercial) aircraft full situational awareness “simultaneous” smart jam of 3 radar & 1 comm band mission planning/debriefing
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Characteristics - 5 EST - Systems System Controller Comm ESM/ECM Radar ECM Radar ESM/ELINT Chaff ADC Air Data Computer LIRS Laser Inertial Ref ARINC 429 RS232 ARINC 429 discrete1553 system integrator modified OTS real-time systems existing aircraft systems OTS “dumb” systems EW Suite Aircraft Systems
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Characteristics - 6 EST - Sub-system Software Radar Electronic Support Measures (ESM) modified USN (1980 vintage) real-time software classified Secret Radar Electronic Counter Measures (ECM) 4 band jammer modified US + developed Canadian real-time s/w 125k + source lines of code (SLOC) Communication ESM/ECM (+ direction finder) fully developed Canadian real-time s/w 250k + SLOC standalone system (PC/Windows NT)
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Characteristics - 7 EST - System Controller Software System Processor 750K SLOC full MIL-STD-2167A CF owned & maintained tactical touch display keyboard supplementary touch display (also used as back-up) trackball disk drives System Processor computer
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Characteristics - 8 EST - System Processor Partial Task List Periodic display (100 msec) system status (500 msec) BITE (5000 msec) ESM (200 msec) ELINT (1000 msec) ECM (5000 msec) CommDF (500 msec) LIRS (400 msec) ADC (200 msec) chaff (500 msec) record (500 msec) Asynchronous keyboard trackball CommDF touch display System bootstrap initialization maintenance
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Characteristics - 9 What might go wrong when developing this type of software? Requirements formulation / documentation Design formulation / documentation Test formulation / documentation / conduct Schedulability on a single processor Compatibility among systems Support for long-term maintenance To name just a few
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Characteristics - 10 Characteristics of EST RT software Based upon our review of the EST system and, in particular, its System Processor integration software, what are some of the characteristics of real-time software?
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Characteristics - 11 timeliness / scheduleability real world interaction concurrency (physical and logical) reliability safety complexity dynamic internal structure scalability distributed Characteristics of RTS Quality of service requirements
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