Systems and methods of location and tracking
First Claim
1. A position location determination system comprising:
- a first network comprising at least one Access Point (AP) network element, each AP creating a coverage area referred to as a Basic Service Set (BSS), configuring other network elements in its BSS, and providing access to the internet to network elements in its BSS;
a second network of zone tags underlying the first network capable of making range measurements with mobile tags;
time being divided into range-measurement-period intervals, each interval comprising a measurement period when zone tags make range measurements, followed by a sleep period wherein zone tags, mobile tags or both, sleep to save power;
said zone tags and mobile tags waking up at the beginning of range-measurement-period, and an anchor network element contends for the channel and seizes the channel;
mobile tags and zone tags making range measurements according to a schedule; and
the range measurements are used by triangulation algorithms to estimate the position of the mobile tags.
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Accused Products
Abstract
A position location system is described for determining position of mobile Tags attached to assets or people. Zone Tags are installed in the venue to assist in position location estimation of mobile Tags. Time is divided into intervals, each interval comprising at least one range measurement sub-interval, and an idle sub-interval where zone Tags and mobile Tags go to sleep to save power. A zone Tag or mobile Tag is designated as the anchor network element. The anchor network element contends and seizes the communications channel at the beginning of each interval to start the range measurement phase. Mobile Tag position location estimates are made periodically. Between the periodic range measurement based position estimates, mobile Tag sensor readings are used to update the mobile Tag'"'"'s position location. The period between range measurement based position updates is adjusted based on the statistics of the differences between the range measurements based position estimate and the sensor based position updated.
32 Citations
10 Claims
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1. A position location determination system comprising:
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a first network comprising at least one Access Point (AP) network element, each AP creating a coverage area referred to as a Basic Service Set (BSS), configuring other network elements in its BSS, and providing access to the internet to network elements in its BSS; a second network of zone tags underlying the first network capable of making range measurements with mobile tags; time being divided into range-measurement-period intervals, each interval comprising a measurement period when zone tags make range measurements, followed by a sleep period wherein zone tags, mobile tags or both, sleep to save power; said zone tags and mobile tags waking up at the beginning of range-measurement-period, and an anchor network element contends for the channel and seizes the channel; mobile tags and zone tags making range measurements according to a schedule; and the range measurements are used by triangulation algorithms to estimate the position of the mobile tags. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification