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After reading about Ukrainians buried under rubble, I've been wondering if they're running the right apps to notify rescuers. GPS geolocation requires an uninterrupted path to GPS receivers. Rubble can block signals.
Would a Bluetooth transmitting app make their location far easier to find?
Avalanche beacons
https://www.switchb...t-avalanche-beacons
Some bluetooth [4and20, Mar 20 2022]
Problems penetrating snow for long?
https://beaconreviews.com/apps_search.php
This old review suggests that avalanche apps have been dicey [4and20, Mar 20 2022]
It's the snow, stupid
https://www.alpine-...r20131223001127.pdf
Snow den? [4and20, Mar 20 2022]
If this doesn't describe my love life
https://en.wikipedi...wiki/Crush_syndrome
no one else will [4and20, Mar 27 2022]
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Annotation:
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If GPS isn't working under the rubble, then what information
would be transmitted over Bluetooth? |
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"I'm here!"
"Where's here?" |
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At the very least, a free cellphone. The limited range of bluetooth works to its advantage in this case. |
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At the point of broadcast... |
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So you're going to have more than one device locating that
source by triangulation? |
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It's the U1 ultra wideband chip in the Air Tags that allow
precision location finding. I'm not sure if that's just an
advanced form of Bluetooth or something else they have in
addition to the Bluetooth. Regardless, it doesn't have to be
super precise, as the searching device can trigger a loud
audible tone in the one buried in rubble. |
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According to my last link, the problems encountered by avalanche beacon apps are partly related to strong wifi and bluetooth interference from snow. Luckily, there is no snow in Ukraine. |
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//So you're going to have more than one device locating that source by triangulation?// |
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No, but [4and20] can have a staffer look into it, I'm sure. |
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Smartphones have like 9 different antennae on the back these
days (some designed for receiving only, but "there's an app for
that"...). If Bluetooth is no good for transmitting through
walls, maybe one of the other systems is better? |
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Ultra wideband seems to work pretty well. Actually,
Bluetooth does pretty good through walls too, and can
have up to 150 ft range. There is absolutely no reason
Bluetooth wouldn't work for this purpose. |
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