Guest Post: Try Radar For Your Next Project | Hackaday
DIY Arduino Radar System using Ultrasonic Sensor
Amazon.com: Wireless , Reverse Radar System with 4 Parking Sensors, Wireless LED Distance Display with Sound Warning + 4 Black Color Car Reverse Parking Sensor for Auto Vans RV Trailer : Automotive
Wireless Distance Measurement Based on 24GHz Radar - Hackster.io