US 6,611,742 B1 · Automobile security alarm systems

Abstract

A method and apparatus for an automobile security system. A GPS Receiver is used to measure the location of an automobile, and after the user has left the car, to measure the location of the user. The location of the car when it is parked is recorded in the GPS Receiver System. When the user is more than a pre-determined distance from the car, as determined by a GPS location measurement that is compared with the stored GPS location, the security system is activated and the car is locked. Subsequently, when the user comes within a second pre-determined distance of the car, the security system is deactivated, and the car is unlocked. Advantageously, both the locking and unlocking is accomplished without forcing the user to perform any manual act. Advantageously, the user can get directions from the GPS Receiver to help locate the car.

Claims12

Dependent claims

A method of controlling an automobile security alarm system, comprising the steps of:

responsive to turning off the engine of the automobile, performing an initial location measurement;
recording an initial location obtained from said initial location measurement;
a user of said automobile leaving said automobile;
performing a series of subsequent location measurements for determining a present location of a user of said automobile, said user carrying a location device having the record of said initial location measurement;
if a difference between a present location of said user and said initial location exceeds a first pre-determined value, activating said security alarm system in said automobile.

2 more elements

Dependencies are inferred from the claim text.

Automobile security alarm systems

Life of this patent

Automobile security alarm systems

Life of this patent

Abstract

Claims12