Stationary obstacle detector in car path - has Doppler module, transmitting radar beam and delivering floated frequency Doppler signals

摘要

The Doppler module (34), transmits a radar beam and Doppler signals as floating frequencies of the transmitted and reflected radar radiation. The Doppler signals are connected to a variable band-pass filter (46). A device (52) determines the car (10) speed and a Doppler frequency allocated to the latter, forming the reflection of the radar radiation on the stationary obstacle. The band-pass filter is tuned to the Doppler frequency allocated to the car speed. A band-pass detector (58) responds to the passed frequency range signal to warn against a stationary obstacle (28) in the travelling direction. A radar distance module (60) transmits signals from the reflected radar radiation in dependence on the obstacle distance. ADVANTAGE - Improved detection of stationary obstacles for travelling car.