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Space based intrusion detection system Disclosure Number: IPCOM000239386D
Publication Date: 2014-Nov-04
Document File: 8 page(s) / 182K

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The Prior Art Database


A space based intrusion detection system that utilizes WI-FI signal variations is disclosed.

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This is the abbreviated version, containing approximately 52% of the total text.

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Space based intrusion detection system

Disclosed is a space based intrusion detection system that utilizes WI-FI signal variations.

Researchers have shown it's possible to leverage Wi-Fi signals to detect specific movements without needing sensors on the human body or cameras. When a person moves, there is a slight change in the frequency of the wireless signal. Moving a hand or foot causes the receiver to detect a pattern of changes known as the Doppler frequency shift. These frequency changes are very small - only several hertz - when compared with Wi-Fi signals that have a 20 megahertz bandwidth and operate at 5 gigahertz but researchers developed an algorithm to detect these slight shifts.

Doppler frequency shift can be processed by WI-FI routers to identify pattern changes leading to movement detection in the range of the router. This technology can be used to build home intrusion detection systems. This article describes the different components of the intrusion detection system, their relationship and how the overall process works.

Figure 1 depicts a Wireless Access Point (WAP) commonly found in public and private locations such as coffee shops, airports, and businesses. It is desirable for WAP access to be restricted to individuals making use of the services at this location. For instance, a coffee shop owner would prefer if only individuals that were inside the shop have access to the wireless connection. A common process used to control access to a WAP is to require a password that anyone can obtain by requesting it, and then routinely changing the password.

Figure 1

Spaces are well defined, two or three dimensional areas which seamlessly change the device user's experience. Spaces serve to provide new control to commercial or public


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buildings (or any location that can defined geographically) that would not normally be available. These locations can be as small as a table, room, or floor in a building, or as large as countries or continents. Location technology is the only limitation on how accurate/small the boundaries of these spaces are. Spaces also overlap, and know about all devices currently contained in the space and their location within the space.

Figure 2 depicts example of 'space' is defined as a logical abstraction mapped to a geographical coordinates. It can be simple or complex.


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Figure 2

As depicted in Figure 3, a space can be a 2D or 3D representation of a geographical location specified by latitude, longitude and altitude. It can of any size (office, floor, building, region, country...).


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Figure 3

A Wi-Fi router is a multi-...