kyzyl

6 ms·

1.
by kyzyl 5y ago
UBC does, or at least did, implement it across many of their physics and math courses. I'm not personally aware of on-going discussions, but there are many faculty members there and collaborators working on this stuff, as well as many
2.
by kyzyl 7y ago
https://rpy2.readthedocs.io/en/latest/
3.
by kyzyl 7y ago
It's true that the laser frequency is sweeping, but it very well may not be over the same band. The sweep bandwidth in a typical lidar is likely in the 1-10GHz range. The carrier frequency of the laser that this modulation is riding on
4.
by kyzyl 7y ago
Yeah, it definitely can be shorter than 100ms. See my sibling comment. It just depends on the type of radar being used and the target range/velocity. Certainly for shortish range targets and mmwave radars on reasonably reflective targe
5.
by kyzyl 7y ago
It depends entirely on what configuration of RADAR you've got, and what you're pointing it at. You can build a system that will result in returns with beat frequencies of just about anything, depending on the Tx modulation and the
6.
by kyzyl 7y ago
So your're correct that there is a Fourier Transform analogy for the uncertainty principle, but in the context of FMCW lidars (which brought up the question of velocity vs position uncertainty), the measurement of frequency actually de
7.
by kyzyl 7y ago
It really depends on the type of RADAR being used. If it's an FMCW radar, typically you will get a beat signal whose frequency corresponds to the target range. That frequency will vary with range, and in order to be well resolved you h
8.
by kyzyl 7y ago
Actually most pulsed lidar systems use pretty high peak powers, which result in an eye-safe average power only because they are on for a sequence of very short pulses (~1ns). It's pretty unlikely OP is actually experiencing vision prob
9.
by kyzyl 7y ago
I suppose it will be a good while before we can approach an empirical proof for this sort of thing, since FMCW lidars are still very scarce, even more so than pulsed lidars right now. However, even if every car does have an FMCW lidar, the
10.
by kyzyl 7y ago
Sorry I didn't see your responses until now. Indeed, there are many ways to slice the specific problem. I was specifically responding to the parent's statement: > It would be a game changer if someone were to come up with a nov
11.
by kyzyl 7y ago
The tools to do this exist. It's usually called 'blind source separation', as in "What are the N distinct audio signals which sum up to best explain a given compound signal, without knowing the possible source signals ah
12.
by kyzyl 7y ago
I find it odd to state that ASC's lidars work, and just cost too much until there is sufficient volume, but then turn around and say that the pulsed lidar groups with working products (that work better than flash lidar, in fact) are to
13.
by kyzyl 8y ago
You think that Zhang odometry paper is good, you should see the stuff his grad student came up with for his thesis[0]. The results look almost as good as the figures from the Ouster blog post! ;-) [0] https://www.ri.cmu.edu/
14.
by kyzyl 8y ago
Amusingly, the question of "where to set the threshold" is actually a problem for pulsed lidar in general. What constitutes the pulse returning, and how do you know which pulse is dominant? In any case, my point was that I don&#x2
15.
by kyzyl 8y ago
If you're talking about how the human eye perceives light or dark objects, then yes it can be more complicated. Especially when colour is involved. That said, what they're talking about here when they say 'reflectivity'
16.
by kyzyl 9y ago
The problem with Musk's argument is that there isn't any indication so far that the machine learning has tricks up its sleeve that are sufficient resolve all of the ambiguous situations drivers come across. Having direct, accurate
17.
by kyzyl 9y ago
Amusingly, Xilinx makes dev tools that are so unbelievably bad that it's almost impossible to do any of the best practices for development that you would hope for in safety critical systems. No source control, code review, reproducible
18.
by kyzyl 9y ago
Heh, or perhaps we could say that it's simply a short hand colloquialism for "on the order of 10 years"? ;-) As somebody with physics and engineering degrees, as well as 20 years of CS experience, I'd very much enjoy it
19.
by kyzyl 10y ago
In principle it can be done, of course, but it wouldn't be economical. The abrasive sludge that accumulates in the bottom of the machine is full of large and small bits of various different materials, which complicates filtering. Even
20.
by kyzyl 10y ago
I opened this thread in the morning, got to that '100 page' remark and belly laughed. Then my day took over, and I just refreshed and saw your comment, and belly laughed again. I'd say it's been a successful day. Thanks
21.
by kyzyl 10y ago
The comparison to breaking out the PCB software is a touch misleading. You'd certainly also find it to be an onerous task to break out the PCB software and design a board for the Sitara SoC that sits on the Beaglebone. Realistically th
22.
by kyzyl 10y ago
Also more possible haha. It's all fun and games until you predicate the success of your project on trying to collimate a laser beam from here to alpha centauri, so that it can manually assemble a (dielectric!) robot one piconewton at a
23.
by kyzyl 10y ago
> Sky's the limit. Until you get a bigger antenna ;-)
24.
by kyzyl 10y ago
This really strongly depends on your industry/focus, and what your end goal is. Some industries are completely dominated (library/community wise) by one or the other. I used to do finance work and strongly preferred python, so I t
25.
by kyzyl 10y ago
Yeah the real reason you never get guides to this stuff is that when it comes down to making a successful prototype, what makes it good vs. just barely work or not work at all is somewhat of a black art. There is so much intuition and exper
26.
by kyzyl 10y ago
Indeed, Broadcom doesn't even allow you to buy their proprietary SoC (at least, last I checked), so you can't make a knock off RPi board, or integrate the SoC and peripherals into a custom application board. You need to use an RP
27.
by kyzyl 10y ago
That's really the crux of the whole idea, in my opinion. Even if IoT hasn't really materialized in any meaningful way yet, the fact of the matter is that the way current internet technologies work, there will be multiple parties i
28.
by kyzyl 11y ago
It probably sends somebody 'tips' about you ;-)
29.
by kyzyl 11y ago
Indeed. The curvature of my humor might have been too subtle. Easily mistakable for a troll. Luckily I'm often too late to threads--as you can see--to be subject to getting mobbed with down votes ;-)
30.
by kyzyl 11y ago
I dunno, the prize might be a little overblown. All-in it seems like a pretty marginal improvement if you ask me.

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