We are a group of students, who are currently investigating how to build a robot that is meant to work at arctic temperatures (peaks at roughly -30 degrees Celsius). We would like to equip our robot with a motion / object detection sensor. The sensor should be able to detect movements at a distance up to 20m (assuming clear air), on a horizontal 2D plane (i.e. it is sufficient if it only detects movement on a plane parallel to the ground, that is only a few cm thick).
All other requirements are not too important right now, as we can probably engineer around most of them.
Based on our online search, we came to believe that we should probably aim for either a LiDAR or a Radar sensor, as other technologies do not seem to have enough range.
However, we struggle with pinpointing an exact product and we feel that our approach is not the best for finding a proper sensor.
Is there a better way of finding appropriate sensors other than google? Is there a specialized niche for low-temperature electronics we are not aware of? Or has maybe even one of you faced a similar situation and can help us with some recommendations?
Any help is greatly appreciated!