Distributed method and system for calibrating the position of a mobile device
First Claim
1. An electronic device, comprising:
- an accelerometer configured to provide a measurement of the electronic device acceleration;
a set of wireless receivers for receiving signals from a set of position reference devices;
the electronic device configured to;
receive positioning assistance data comprising a position of a position reference device;
set a position of the electronic device to the received position of the position reference device;
read the accelerometer measurement after a predetermined time delay;
calculate an updated velocity of the electronic device and an updated position of the electronic device based on the accelerometer measurement, a previous velocity of the electronic device and a previous position of the electronic device; and
iteratively perform the reading and the calculating until further positioning assistance data is received from a position reference device.
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Abstract
A method and system is described where a plurality of position reference devices use short-range wireless communication protocols to transmit positioning assistance data to nearby mobile devices, and the mobile devices use the assistance data to re-calibrate their positioning systems. In some embodiments, mobile device includes an accelerometer and the accelerometer measurements are used to calculate an updated velocity of the mobile device and an updated position of the mobile device based on the accelerometer measurements and previous velocity and position of the mobile device. The short-range communication methods include NFC, RFID, Bluetooth®, short-range 802.11, Wi-Fi Direct, and high frequency focused beams such as 60 GHz. The position reference devices are passive or active NFC tags, passive or active RFID tags, other devices that include such tags as their components, Bluetooth®-enabled devices, 60 GHz-enabled devices, and 802.11 access points that can lower their transmit power.
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Citations
26 Claims
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1. An electronic device, comprising:
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an accelerometer configured to provide a measurement of the electronic device acceleration; a set of wireless receivers for receiving signals from a set of position reference devices; the electronic device configured to; receive positioning assistance data comprising a position of a position reference device; set a position of the electronic device to the received position of the position reference device; read the accelerometer measurement after a predetermined time delay; calculate an updated velocity of the electronic device and an updated position of the electronic device based on the accelerometer measurement, a previous velocity of the electronic device and a previous position of the electronic device; and iteratively perform the reading and the calculating until further positioning assistance data is received from a position reference device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification