Sliding time window based WLAN (Wireless Local Area Network) indoor WKNN (Weighted K Nearest Neighbors) tracking method

A sliding time window, indoor positioning technology, applied in the field of pattern recognition, can solve the problems of severe jitter of estimated position coordinates and uneven estimated trajectory.
CN101895867BInactive Publication Date: 2013-11-06HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2013-11-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a sliding time window based WLAN (Wireless Local Area Network) indoor WKNN (Weighted K Nearest Neighbors) tracking method, relating to the field of mode identification and solving the problem of unsmooth estimated track, i.e. fierce shake of an estimated position coordinate, caused by elements of limited terminal sampling rate and difficult motion state obtain in the traditional WLAN indoor tracking method. The method comprises the steps of: firstly, acquiring signal samples and establishing a corresponding position fingerprint database; obtaining the pre-estimated position coordinate, motion rate and confidence region at different time of the terminal in real time with a WKNN positioning method according to a signal sample newly acquired; rejecting fault pre-estimated position points with abrupt signal intensity change in a pre-estimated position set compared with adjacent time position points according to a forward sliding time window threshold, a backward sliding time window threshold and a corresponding confidence region; and finally, connecting final estimated position points in chronological sequence to obtain the smooth estimated motion track for the terminal. The invention is suitable for indoor tracking and positioning.
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Description

technical field

[0001] The invention relates to the field of pattern recognition, in particular to an indoor WKNN tracking method of a WLAN based on a sliding time window. Background technique

[0002] WLAN (Wireless Local Area Network) technology is a high-speed wireless IP network communication technology developed at the end of the 20th century. The technical standard number is IEEE802.11. Since the standard came out, the wireless communication market and related location-based applications Services have grown by leaps and bounds. Under the existing WLAN indoor environment, users can realize high-speed access to the Internet anytime and anywhere by virtue of portable computing devices such as notebook computers, palmtop computers and personal digital assistants (PDAs).

[0003] Moreover, indoor mobile users have increasingly strong demands for real-time and local location information, which also provides a broader market space for services and applications based on termi...

Claims

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