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I've wanted to thank the author for a while for his past articles [1][2] which have been a wonderful source of information when working on my sonar systems [3]. This article again explains really well a complicated topic. Please, keep up the great work!
[1]: https://hforsten.com/radar-phase-measurements.html
[2]: https://hforsten.com/6-ghz-frequency-modulated-radar.html
[3]: https://twitter.com/alextoussss/status/1756371553460121766
Could this be adapted into a voxel system? Seems like it could be cheaper than LIDAR which are a huge cost for why the HW for self-driving systems are so expensive & work in far more environments that LIDARs struggle with. I suspect getting multiple directions simultaneously is hard?
To go from those 4D radar maps to a voxel system requires a whole lot of software, of course.
The end goal seems to be to beat LIDAR on price and reliability (turns out moving mirrors don't like years of constant vibrations), while delivering enough resolution for self-driving.
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Does KiCad allow to take these delays for each pin into account automatically or do you need to do all that manually? Edit: it's using the pad property of "pad-to-die-length" if doing it manually, right?
No, it needs to be done manually. It wasn't as tedious as it sounds though. Most of the pins are very close in delay already and there were just few traces that I had to adjust a little.
I did some prototyping but never got the stage if actually fumbling around with PCBs a few years ago, things seemed to progressing quite well.
I remember this article from the same site a while back - https://hforsten.com/heartbeat-detection-with-radar.html I bought some cheap 10ghz and 24ghz dopper radar units off of amazon and started tinkering with them. You can absolutely pick up heartbeats and breathing just visually in the spectrogram. Here's a few samples from that era: 10ghz pointed at ceiling fan: https://www.youtube.com/watch?v=tIiFvByf1CQ 10ghz p…
interesting does/can it work behind structures? is it safe to point this at yourself?
It's non ionizing (aka it doesn't have enough energy to instantly destroy cells unlike uv radiation) but it can heat up tissue, which is linked to cancer and worse (think microwave ovens).
Hats off to you!
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In theory, though it sounds like to compete with LIDAR it will need about 1000x more antennas, with a related increase in electronics.
Cutting-edge AESA radar like on the F-35 is incredible. It actually looks like a black and white photograph. I think your guess on antennas is roughly correct based on what we know about modern AESA.
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interesting does/can it work behind structures? is it safe to point this at yourself?
yes, it's safe. It's not that different from regular WiFi or cellular signals. It's non ionizing (aka it doesn't have enough energy to instantly destroy cells unlike uv radiation) but it can heat up tissue, which is linked to cancer and worse (think microwave ovens).
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yes, it's safe. It's not that different from regular WiFi or cellular signals. It's non ionizing (aka it doesn't have enough energy to instantly destroy cells unlike uv radiation) but it can heat up tissue, which is linked to cancer and worse (think microwave ovens).
There’s no risk of cancer from heating up tissue.
A few unlucky people have been literally cooked to death by military radar. It's as awful as it sounds.
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yes, it's safe. It's not that different from regular WiFi or cellular signals. It's non ionizing (aka it doesn't have enough energy to instantly destroy cells unlike uv radiation) but it can heat up tissue, which is linked to cancer and worse (think microwave ovens).
There’s no risk of cancer from heating up tissue.
No Idea why phones come with a SAR rating then and why there are safe limits defined, when no one found unsafe limits.