# Active Bat

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{{Short description|Location system}}
{{Use dmy dates|date=April 2022}}
'''Active Bat''' is a low-power, [wireless](/source/wireless) indoor [location](/source/Acoustic_location) system accurate up to 3 [cm](/source/Centimetre). It is based on a principle of [trilateration](/source/trilateration), and relies on multiple [ultrasonic](/source/ultrasound) receivers embedded in the ceiling and measures [time-of-flight](/source/time-of-flight) to them.

Active Bat is an [indoor localization system](/source/Indoor_positioning_system) which gives an accuracy within centimeters. This is a range based technique, which works by finding the distance to minimum of three reference nodes and then using [multilateration](/source/multilateration) technique to find the exact position. The distance to reference nodes is found out using the [time of arrival](/source/time_of_arrival) of ultrasonic signals from the reference nodes.

==See also==
*[Sentient computing](/source/Sentient_computing)
*[Ubiquitous computing](/source/Ubiquitous_computing)

==References==
* {{citation |last1=Harter |first1=Andy |last2=Hopper |first2=Andy |last3=Steggles |first3=Pete |last4=Ward |first4=Andy |last5=Webster |first5=Paul |title=The anatomy of a Context-Aware Application |journal=Wireless Networks |volume=8 |pages=187–197 |year=2002 |issue=2/3 |doi=10.1023/A:1013767926256|s2cid=27207353 }}

==External links==
*[https://web.archive.org/web/20080223104814/http://www.cl.cam.ac.uk/research/dtg/attarchive/bat The Bat System] at Cambridge Computer Laboratory Digital Technology Group

Category:Ultrasound
Category:Navigational equipment
Category:University of Cambridge Computer Laboratory

{{Sound-tech-stub}}

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Adapted from the Wikipedia article [Active Bat](https://en.wikipedia.org/wiki/Active_Bat) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Active_Bat?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.