Amplitude modulation radar based vehicle safety system

PURPOSE: A vehicle safety system using amplitude modulation radar is provided to detect only modulation frequency signals reflected from an object by removing unnecessary signals, thereby minimizing phase distortion. CONSTITUTION: A vehicle safety system using amplitude modulation radar comprises a distance measuring sensor and a control unit. The control unit conducts at least one of a display control and an operation control. The display control measures signals from the distance measuring sensor are analyzed, and displays analyzed information. The operation control controls a vehicle control unit in order to operate the vehicle for satisfying the safety of vehicle. The distance measuring sensor comprises a signal generator(110), a transmitter/receiver(120), and a phase lag detector(130). The transmitter/receiver transmits modulation frequency signals to an object, and receives signals reflected from the object. The phase lag detector detects envelope signals about the signals received through the transmitter/receiver, extracts only modulation frequency signals reflected from the object by using the information about unnecessary signals and the envelope signal, and detects phase lag between a reflected modulation frequency signals and the modulation frequency signals.