5.8G is a special distance/displacement measurement method. Sensing technologies such as microwave radar can solve the measurement problem of short-range targets, also known as short-range radar.
Radar (RADAR) is a type of radio detection and distance measurement. Its main components include transmitter, transmitting antenna, receiver, receiving antenna, signal processor and display (external).
Millimeter wave radar is a radar that can detect in the millimeter wave frequency band. Generally millimeter wave refers to the frequency domain of 30~300GHz (1~10mm) frequency domain