A security system is provided that uses two or more object-locating
systems to determine whether a sensed object is a household member or an
intruder. One of the object-locating systems locates "cooperative"
objects, which are household members that wear or carry a device that
communicates with the system to allow the system to determine the
locations of the household members. Another of the object-locating
systems locates non-cooperative objects, such as intruders, and typically
also locates the cooperative objects. When an object is located by the
second object-locating system, the security system of the invention
determines whether the object location corresponds to a location of a
cooperative object as determined by the first object-locating system. If
so, the security system decides that the object is a household member and
does not trigger the alarm. If not, the security system decides that the
object is an intruder and may trigger the alarm.