You need a 70 GHz radar specifically designed to identify a person. We can develop on the basis of SOC from TI. But the price will be expensive. If interested, we can discuss the project.
Hii there... I understand your requirements and I have already made this type of project its working and fitted in my garage. So that when ever someone came the light of the garage glows. I made a very precise human motion detector. That same device is working as a bugler alarm during night. I can share you the Circuit diagram, PCB layouts component list etc. You can make one on your own or I can courier you the device. I'll be very happy if I can help you on this project. You can chat with me for more details on your project so that we can make it more advance and appropriate. Also I'm taking the bid low from others... because Electronics is my passion. I love to build projects. You can text me any time!
I am electronic engineer. Working at eaton corporation since last 2 years. I have done same project during my college final year. I will just need components as long as code ready and tasted.