4 ms·
Lidar waveforms are worth 40x128x33 words
- stavros 8mo ago168,960
- amarant 8mo agoClearly 10,813,440. Gotta factor the words!
- brcmthrowaway 8mo agoCan lidar be purchased for hobbyist use yet?
- ceejayoz 8mo agohttps://www.adafruit.com/product/4010 https://www.adafruit.com/product/4010
- frozeus 8mo agoDepends on your budget and the resolution you need. E.g Livox mid 360 https://store.dji.com/en/product/livox-mid-360 https://store.dji.com/en/product/livox-mid-360
- ImPostingOnHN 8mo agoCheck out PiLIDAR for one of many options: https://github.com/PiLiDAR/PiLiDAR https://github.com/PiLiDAR/PiLiDAR
- froglets 8mo agoI haven’t done it myself but I’ve heard of people harvesting LiDAR units from their old/broken robot vacuums.
- generuso 8mo agoSure. Line scan indoor units are extremely affordable, and some cost less that $20, sold as spare parts for robot vacuum cleaners. Outdoor units (with higher ambient light tolerance and longer range) are an order of magnitude more expensive, but also available. Here is some detailed information about low cost units: https://github.com/kaiaai/awesome-2d-lidars/blob/main/README.md https://github.com/kaiaai/awesome-2d-lidars/blob/main/README...
- ck2 8mo agoBTW with self-driving cars, what happens when there are hundreds of Lidar signals at one intersection? There's no way a sensor can tell if a signal was from its own origin? Guessing any signal should be treated as untrusted until verified somehow but I suspect coders won't be doing that unless it's easy
- Rarebox 8mo agoIf one lidar hits another, it will result in at most one bad reading (perhaps a bad column?). This can likely be filtered, or a bad scan (360deg) can be altogether rejected and the data predicted using models based on past sensor readings.
- MengerSponge 8mo agoI guess phase and timing sensitivity help a lot, because it's unlikely that another emitter will perfectly match your emission/detection duty cycle. It's also hard to get hundreds of cars at one intersection, because cars are very big. The key terms in your literature/patent search should probably be "Crosstalk" and "multi-LIDaR".
- r2_pilot 8mo agoTypically you use a pulse train and filter your train from the noise
- jowday 8mo agoWorked adjacent to the AV space 5~ years ago. This wasn’t my area but I remember learning that this was a robustly solved problem long ago.
- retrac 8mo ago> There's no way a sensor can tell if a signal was from its own origin? https://ui.adsabs.harvard.edu/abs/1978ntc.....2...18F/abstract https://ui.adsabs.harvard.edu/abs/1978ntc.....2...18F/abstra... https://apps.dtic.mil/sti/tr/pdf/ADA218226.pdf https://apps.dtic.mil/sti/tr/pdf/ADA218226.pdf > An increasingly popular modulation scheme is Binary Pseudo Random Phase Coding (BPRPC), whereby the phase of the transmitted signal is switched between 0 and 180 under the control of a binary pseudo random sequence this applies straightforwardly to lidar basically: optical CDMA or DSSS spoofing replay may still be a concern