What is real time system? Define real-time system Real-time system example
Real-Time System
A system is called a real-time system
if it needs to express the quantitative time (real-time) to describe the behavior
of the system – Prof. Rajib Mall
A system whose basic specification and
design correctness arguments must include its ability to meet its time
constraints is called real-time system. The system’s correctness depends not
only on the logical correctness, but also on the timeliness of its actions.
A real-time system consists of both a controlling
system and a controlled system.
- Controlled system – the environment that has to be monitored
- Controlling system – the devices that monitor the environment
Example:
1. In an auto-pilot system, the
aircraft has to be controlled by the auto-pilot system including navigation,
landing, and takeoff. Here, the aircraft
is the controlled system and the sensors, computers, or any other devices
that control the aircraft is the controlling
system.
2. In a car safety system, the
airbag has to be released when a sensor detects collision. This must be happened
within a time frame, say, within 10msec. Otherwise, we state that the system is
failed. Here, airbag is the controlled system, and the system that
consists of the sensor to detect the
collision and the device used to release the airbag is called as controlling system.