Systems and methods for detection of device displacement and tampering

• US 8,902,062 B2
• Filed: 01/27/2011
• Issued: 12/02/2014
• Est. Priority Date: 01/27/2011
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Terugu, VenkataChalapathi, Kore, Vinayak Sadashiv, Berezowski, Andrew G.
• Primary Examiner(s): Wu, Daniel
• Assistant Examiner(s): LITTLEJOHN JR, MANCIL H
• Application Number:
  US13/014,918
• Publication Number:
  US 20120194339A1
• Time in Patent Office: 1,405 Days
• Field of Search: 340/628, 340/539.31, 340/3.1, 340/506, 340/507, 340/505, 340/10.1, 340/539.1, 340/825.36, 340/825.49, 340/531, 180/282, 180/283, 701/41, 701/50, 701/109, 701/22, 701/58
• US Class Current: 340/539.31
• CPC Class Codes: H04W 52/0251 using monitoring of local events, e.g. events related to user activity
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for determining the displacement of or the tampering with a device is provided. The method includes determining an effective displacement in an X direction of a device, determining an effective displacement in a Y direction of the device, and determining an effective displacement in a Z direction of the device. The method also include determining if any one of the effective displacement in the X direction, the effective displacement in the Y direction, or the effective displacement in the Z direction is greater than a predetermined threshold, and when at least one of the effective displacement in the X direction, the effective displacement in the Y direction, and the effective displacement in the Z direction is great then the predetermined threshold, determining that the device has been displaced.

Claims

1. A device comprising:

an input device;

a central processing unit in communication with the input device for determining the presence of an ambient condition;

a radio in communication with the central processing unit;

a plurality of tilt/mobility sensors including at least one tilt/mobility sensor included in a processor of the device and in communication with the central processing unit, the at least one tilt/mobility sensor includes a sleep mode and is woken up when an event occurs,

wherein each of the tilt/mobility sensors obtains a displacement measurement or signal, and

wherein the central processing unit compares the displacement measurement or signal from each of the plurality of tilt/mobility sensors to a respective predetermined value to determine displacement, the comparisons are performed in combination to provide better resolution in determining whether the device is displaced or if a sensor has been blocked or covered.

2. The device of claim 1 further comprising a filter associated with the at least one tilt/mobility sensor for filtering noise detected by the tilt/mobility sensor.

3. The device of claim 1 wherein the at lease one tilt/mobility sensor includes an accelerometer.

4. The device of claim 1 wherein the at least one tilt/mobility sensor and the central processing unit employ acceleration vector analysis to obtain the displacement measurement or signal and to determine whether the device is displaced.

5. The device of claim 1 wherein the at least one tilt/mobility sensor and the central processing unit employ radio frequency triangulation to obtain the displacement measurement or signal and to determine whether the device is displaced.

6. The device of claim 1 wherein the plurality of tilt/mobility sensors and the central processing unit employ acoustic ultrasonic ranging to obtain the displacement measurement or signal and to determine whether the device is displaced.

7. The device of claim 1 wherein the plurality of tilt/mobility sensors and the central processing unit employ light ranging to obtain the displacement measurement or signal and to determine whether the device is displaced.