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BTW with self-driving cars, what happens when there are hundreds of Lidar signals at one intersection?<p>There's no way a sensor can tell if a signal was from its own origin?<p>Guessing any signal should be treated as untrusted until verified somehow<p>but I suspect coders won't be doing that unless it's easy
Typically you use a pulse train and filter your train from the noise
If 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.
I 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.<p>The key terms in your literature/patent search should probably be "Crosstalk" and "multi-LIDaR".
Can lidar be purchased for hobbyist use yet?
Depends on your budget and the resolution you need.<p>E.g Livox mid 360
<a href="https://store.dji.com/en/product/livox-mid-360" rel="nofollow">https://store.dji.com/en/product/livox-mid-360</a>
<a href="https://www.adafruit.com/product/4010" rel="nofollow">https://www.adafruit.com/product/4010</a>
Check out PiLIDAR for one of many options:<p><a href="https://github.com/PiLiDAR/PiLiDAR" rel="nofollow">https://github.com/PiLiDAR/PiLiDAR</a>