Object detection method
According to the object detection method, based on the Doppler effect of the millimeter-wave radar, the speed and the relative distance of the moving object are detected, so that the driver is assisted in safely starting the vehicle, and the situation that dangers and accidents occur under the condition that the sight of theDriver is limited is avoided.
Abstract
The invention discloses an object detection method. The object detection method comprises the steps that (1) radar transmits a transmitted signal with the frequency being f0; (2) the transmitted signal is divided into two branches, one branch of signal is transmitted through a transmitting antenna, the other branch of signal is shunted into two tributary signals entering a channel I and a channel Q in a mixer respectively, and the tributary signal entering the channel Q is firstly subjected to dephasing by 90 degrees; (3) a receiving antenna receives an echo signal reflected by an object; (4) the signals after being subjected to mixing in the step (3) is processed, so that intermediate frequency signals and difference frequency signals in the channel I and the channel Q are obtained; (5) the speed and the relative distance of the target object are analyzed according to the signals in the channel I and the channel Q; (6) the risk of a vehicle is calculated according to the speed and the relative distance of the target object, and a driver is reminded of the risk of the vehicle. According to the object detection method, based on the Doppler effect of the millimeter-wave radar, the speed and the relative distance of the moving object are detected, so that the driver is assisted in safely starting the vehicle, and the situation that dangers and accidents occur under the condition that the sight of the driver is limited is avoided.