RF based positioning and intrusion detection using a wireless sensor network

• US 20040090329A1
• Filed: 10/24/2003
• Published: 05/13/2004
• Est. Priority Date: 10/28/2002
• Status: Abandoned Application

• Current Assignee: Digital Sun, Inc.
• Original Assignee: Digital Sun, Inc.
• Inventors: Hitt, Dale K.
• Application Number:
  US10/692,519
• Publication Number:
  US 20040090329A1
• Time in Patent Office: Days
• US Class Current: 340/552
• CPC Class Codes: A01G 25/167 Control by humidity of the soil itself or of devices simulating soil or of the atmosphere; Soil humidity sensors
• CPC Class Codes: G01N 33/24 Earth materials G01N33/42 takes precedence

Abstract

A wireless sensor system includes an array of wireless nodes, each wireless node including a wireless transceiver transmitting over the radio frequency (RF) and a processor. The array of wireless nodes is distributed over an area. In operation, the array of wireless node determines the presence of an object within the area by measuring the RF power between a neighboring pair of wireless nodes. In one embodiment, an object is present in the area when the RF power between a first wireless node and a second neighboring wireless node is less than a predetermined value.

Claims

1. A wireless sensor system comprising:

a plurality of wireless nodes, each wireless node including a wireless transceiver transmitting over the radio frequency (RF) and a processor, the plurality of wireless nodes being distributed over an area,

wherein the plurality of wireless node determines the presence of an object within the area by measuring the RF power between a neighboring pair of wireless nodes.

2. The system of claim 1, wherein an object is present in the area when the RF power between a first wireless node and a second neighboring wireless node is less than a predetermined value.

3. A method for providing occupancy detection, the method comprising:

providing a plurality of wireless nodes, each wireless node including a wireless transceiver transmitting over the radio frequency (RF) and a processor, the plurality of wireless nodes being distributed over an area; and

measuring the RF power between each neighboring pair of wireless nodes to determine the presence of an object within the area,

wherein an object is present in the area when the RF power between a first wireless node and a second neighboring wireless node is less than a predetermined value.