Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

mmWave radar, you won't see it coming

joshhorne.com

Post reply on HN
Print view View original

31–40 of 192 posts

Re: mmWave radar, you won't see it coming

#31

Post by AdamH12113 »

jcims wrote: post #26
krasin wrote: post #5

Earlier quoted context omitted.

I worked with mmWave radars previously, but not professionally. In my opinion, it would be quite challenging to extract enough features from the current generation of mmWave radars, such as TI IWR1642 ([1]) which have around 4 receivers and 2-3 transmitters, because the incoming data, while having a lot of temporal resolution is very limited in spatial resolution. With greater number of antennas something like what y…

To an extent, but depending on the sampling rate and frequency and your ability to control the area being observed, there is still a lot of information available for modeling and biometric identification. In the extreme you can detect things like heartbeat, rate of breathing, etc. For example, I have a CDM324 24Ghz radar module here on my desk. I set it up to 'watch' me type this comment from across the keyboard. Thi…

“Privacy” seems to be a marketing term here; what they really mean is that you can’t take naked pictures with it.

Re: mmWave radar, you won't see it coming

#32

Post by samatman »

choonway wrote: post #29
chrismorgan wrote: post #15

A technical error in one of the diagrams: Hall effect sensors are not binary, but one-dimensional, and are used so; their output voltage is directly proportional to the magnetic field strength. As for PIR sensors, fundamentally they’re certainly not binary, but I have no idea if they perhaps expose only a binary signal. A better example of a binary sensor might be an on/off switch.

the only true binary sensor i can think of are good old fashioned mechanical switches.

Mercury switch on a bimetallic strip (old-school thermostat) counts, same basic principle.

Re: mmWave radar, you won't see it coming

#34

Post by samatman »

krasin wrote: post #5
idontwantthis wrote: post #3

> Because mmWave radar doesn’t process visual light, what it sees is not personally identifiable. This makes it an ideal choice for monitoring where a camera would not be appropriate. Is 5mm resolution not enough to identify a face? What’s the difference between a 3d model of a person constructed from high res radar and a black and white photo? The radar sounds even more identifiable. Edit: Couldn’t you construct a m…

I worked with mmWave radars previously, but not professionally. In my opinion, it would be quite challenging to extract enough features from the current generation of mmWave radars, such as TI IWR1642 ([1]) which have around 4 receivers and 2-3 transmitters, because the incoming data, while having a lot of temporal resolution is very limited in spatial resolution. With greater number of antennas something like what y…

Sorry, don't buy it.

Gait analysis is excellent at identifying people, and that's projecting from a 2D image at a distance.

Anything which can draw a moving voxel cloud around a human is going to figure out who that human is eventually.

Re: mmWave radar, you won't see it coming

#35

Post by hornej »

hornej wrote: post #11
idontwantthis wrote: post #3

> Because mmWave radar doesn’t process visual light, what it sees is not personally identifiable. This makes it an ideal choice for monitoring where a camera would not be appropriate. Is 5mm resolution not enough to identify a face? What’s the difference between a 3d model of a person constructed from high res radar and a black and white photo? The radar sounds even more identifiable. Edit: Couldn’t you construct a m…

A couple examples to show what the mmWave data looks (bathroom, living room, etc) Intelligent fall detection using TI mmWave radar sensors https://www.youtube.com/watch?v=lsIo_HIk4GY&t=93s 3D Occupancy Sensing For Home and Office https://www.youtube.com/watch?v=9EDhJQbLNyo&t=83s As you can see the radar doesn't reveal too much, while still being able to discern a lot of what is going on in each scene.

all sensors/technology are invasive to a degree, but I would argue radar fairs well in usefulness and anonymity in comparison to other sensors.

if the data were leaked, would you rather have some of your vitals and point cloud data exposed, or a video of you taking a shower?

Re: mmWave radar, you won't see it coming

#36

Post by samatman »

AdamH12113 wrote: post #31
jcims wrote: post #26

Earlier quoted context omitted.

To an extent, but depending on the sampling rate and frequency and your ability to control the area being observed, there is still a lot of information available for modeling and biometric identification. In the extreme you can detect things like heartbeat, rate of breathing, etc. For example, I have a CDM324 24Ghz radar module here on my desk. I set it up to 'watch' me type this comment from across the keyboard. Thi…

“Privacy” seems to be a marketing term here; what they really mean is that you can’t take naked pictures with it.

Which is also nonsense of course, the pornotron of TSA fame is mm wave radar.

Re: mmWave radar, you won't see it coming

#37

Post by chroem- »

na85 wrote: post #22
jacknews wrote: post #14

"One of mmWave's major advantages is its privacy-preserving nature." Ha, haha, hahaha! It can measure your breathing, heart signature, gait, etc. With machine learning this data will certainly be enough to identify you.

I want to get off Mr Bone's Wild Ride.

The ride never ends.

Re: mmWave radar, you won't see it coming

#38

Post by hornej »

jasondclinton wrote: post #19

I've been waiting for someone to finally make a consumer stud finder that works and this just might finally happen after this deregulation of the spectrum. The construction industry would hand over wheelbarrows full of money for a BLE phone-paired puck that located studs and pipes behind drywall. Someone could even sell a "pro" version that combined the data from multiple pucks to render a 3D point cloud of the insid…

This stud finder uses UWB radar (lower frequency) https://www.amazon.com/Bosch-D-Tect-Floor-Scanner-Technology...

Re: mmWave radar, you won't see it coming

#40

Post by 01100011 »

leohonexus wrote: post #33

Very dumb question: If mmWave is operating at 60GHz, how would it be possible for processors (which are operating at less than 1/10th of that clock rate) to process that sampling rate?

Yes. The relevant information may be contained in a narrow swath of bandwidth riding within that 60GHz. Say you use 60GHz as a carrier but only care about changes happening below 10kHz. You can separate out that from the returned signal and only process 20k samples/second.
Post reply on HN