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One day I want to build something like this, except for sound. It would be great to get a heading and distance for where a sound is coming from. This could be both for small scale things (e.g. which part of this is squeaking?) or large scale (e.g. is that booming noise coming from the construction a few blocks away?)
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Very much so. I had a friend who'd just gotten out of EE school as a non-traditional student who was working for a company that was making radars for tracking drones maybe five years before the 2022 Russian invasion. That was an active system, similar in concept to the radars used in air defense system just scaled down and faster acting. The one in this article is a passive system that sees the transmitter on the dro…
> that sees the transmitter on the drone. The comm link is the obvious weak spot on the drone Isn't most drones run by fiber optic nowadays around the front-lines though? Can't really jam those, but maybe still detect it somehow?
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Please elaborate. There are literary step-by-step videos on how to build these. E.g. https://www.youtube.com/watch?v=g3LT_b6K0Mc
Phased array radars are export controlled in the US. It doesnt mean its illegal to build or own, but it might be illegal to sell in some cases
We have a quick demo video as well: https://m.youtube.com/watch?v=QvniJk3uNyA
Along with a deeper dive video: https://m.youtube.com/watch?v=zdJ9Tbm8ALg
We didn't give Jeff great direction on camera alignment calibration or setting the radio gain but he seemed to mostly figure it out. We're improving the UI based on his suggestions (it's open source so you can customize it too)
The RF augmented reality is just one of many applications of this brand new 4x4 MIMO software-defined radio built from the ground up. The AR uses a web app to stream RF points that your phone/laptop browser then live-merges with your local camera in the browser. I've been obsessed with low latency and high frame rate to make it a truly AR experience. More technical details at https://QuadRF.com/
One day I want to build something like this, except for sound. It would be great to get a heading and distance for where a sound is coming from. This could be both for small scale things (e.g. which part of this is squeaking?) or large scale (e.g. is that booming noise coming from the construction a few blocks away?)
On balance, I would say this RF version was 200x harder.
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Fluke has made an acoustic imager for a while now. It is used for detecting leaks: https://www.fluke.com/en-us/product/industrial-imaging/fluke...
Has anyone tried acoustic imaging for water leaks inside walls? I live in a multi-floor 1900s Victorian. A leak can affect several units, and tracing the source can mean opening walls or floors in multiple places, and coordinating access has been getting harder with less WFH. Could one of these tools help map water pipe routes and trace a leak, or are they only going to be useful for air and gas leaks?
You should definitely try a thermal camera. Any moisture will create small temperature differences which are easily picked up by a thermal camera.
Historically these have been quickly shut down without much of an explanation.
The covered materials are very broad, though often limited to equipment built "for purposes of", like in this section. Title 22 Chapter I Subchapter M Part 121 - The United States Munitions List - Category XI Paragraph b Electronic systems, equipment or software, not elsewhere enumerated in this subchapter, specially designed for intelligence purposes that collect, survey, monitor, or exploit, or analyze and produce…
Wouldn't that apply to every spectrum analyzer?
The original quote for a single tile was $50-$100 They came out at $500 Being off by a bit is fine. Being off by 5x to 10x is.. Yikes.
See the 6-pack: https://www.crowdsupply.com/scale-rf/quadrf#products
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You really think these are in TVs going unoticed and someone is paying for each radio?
I have $100 devices in industrial devices that have them. In bulk, they cost next to nothing (not quite as cheap as RFID but getting there).
In a television it's an added cost and it's unclear if serving ads really can offset that extra $25-100 of hardware (and included data) you ship on a $200-1000 television.
It's also unclear to me if the low data packages they come with would be enough to serve meaningful ads to begin with. Those devices usually come with a fixed plan of 100MB/month for 5yrs (or along those lines). Modern smart tv ads are very often video or at least hi res images.