Portable-device-locating system that uses room-level motion sensors and RSSI measurements to determine precise room-location
First Claim
1. A location system for estimating the room-location of a portable device in a building, comprising:
- at least one beacon equipped with a motion sensor for transmitting a radio transmission that includes recent history of motion status sensed in a beacon'"'"'s room-location;
at least one portable device for receiving radio transmissions from the at least one beacon and measuring multiple characteristics of the received transmissions, including received signal strength indication (RSSI) and a motion status of the beacon'"'"'s room-location,where the portable device estimates its own location using all of current signal strength readings, past signal strength readings, patterns of accelerometer-sensed-motion status of the portable device are compared to and patterns of the motion status in the beacon'"'"'s radio transmissions.
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Accused Products
Abstract
A portable-device real-time locating system (RTLS) having portable devices and in-room radio-transmitting beacons. To determine which room a portable device is in, beacons broadcast radio transmissions containing motion-status information about recent history of perceived motion in a room as determined from a motion sensor in the beacon. Portable devices calculate received signal strength indications (RSSI) from nearby beacons, motion-in-room status sensed and reported by those beacons, plus their own motion status based on a portable-device-based accelerometer. A series of portable-device steps estimates the room-location of the portable based on a combination of RSSI analysis, and a comparison of portable-device-motion history to the perceived and recorded motion-status in a room. The analysis of portable-device-motion history and motion-in-room status produces a better estimate of room-level location of the portable device than an RSSI estimate can produce alone.
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Citations
10 Claims
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1. A location system for estimating the room-location of a portable device in a building, comprising:
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at least one beacon equipped with a motion sensor for transmitting a radio transmission that includes recent history of motion status sensed in a beacon'"'"'s room-location; at least one portable device for receiving radio transmissions from the at least one beacon and measuring multiple characteristics of the received transmissions, including received signal strength indication (RSSI) and a motion status of the beacon'"'"'s room-location, where the portable device estimates its own location using all of current signal strength readings, past signal strength readings, patterns of accelerometer-sensed-motion status of the portable device are compared to and patterns of the motion status in the beacon'"'"'s radio transmissions. - View Dependent Claims (2, 3, 4, 5)
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6. A location system for estimating the room-location of a portable device in a building, comprising:
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at least one BLE beacon equipped with a motion sensor for transmitting a radio transmission that includes motion status sensed in a beacon'"'"'s room-location; at least one portable device for receiving BLE radio transmissions from the at least one beacon and measuring multiple characteristics of the received transmissions, including received signal strength indication (RSSI) and a motion status of the beacon'"'"'s room-location; and where the portable device estimates its own room location uses all of past RSSI indications, current RSSI indications, motion status received in the beacon transmission, and accelerometer readings. - View Dependent Claims (7, 8, 9, 10)
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Specification