Intrusion detector installed on the perimeter of a facility. (Photo Source: Electric Energy Online)
Detection is the first of three functions of a PPS. Detection equipment is needed to discover the
actions of an adversary, both
overt and covert. Successful detection is a three step process:
- Sensing -
Sensing occurs when a sensor initiates an alarm.
communication - Information from the sensor is transmitted
so that it may be assessed.
- Assessment - A person reviews
information from the sensor to determine whether or not the
initiating cause of the alarm was an action by an adversary.
It is important to note that all three steps must be completed
for detection to occur.
The effectiveness of the detection function is measured by the
probability of sensing adversary action and the time required for
reporting and assessing the alarm.