radar

I am searching for a tiny radar transmitter/receiver that can detect a slow-moving motor vehicle but only vehicles moving directly towards the radar source (doppler?). Detection range would need to be at least 100 feet and speed detection range would need to be down as low as 10mph or up to...

We know that conductive surfaces reflect the radar signals very well and the radar sees the surface. Why this is not like that when the antenna is circularly polarized?

Hi everyone, I'm newbie when it comes to radars and need some help. I want to make a radar that can detect people/objects from the back of the car when it is reversing. I have demo position2go kit, but I can't seem to configure it to detect reliably. Sometimes it detects when nothing is there...