Working principle and characteristics of 77 GHz millimeter Wave Radar for Automobile forward collision Prevention--samaeye
Public Time: 2018-06-07 15:16:49
The 77 GHz millimeter wave radar introduces:
the millimeter wave is called the extremely high frequency electromagnetic wave, is one kind of 1-10 millimeter electromagnetic wave, its has the microwave and the infrared wave characteristic, the frequency is 30-300 GHz, According to the open frequency band, the 77 GHz millimeter-wave radar is defined as the millimeter-wave radar at 76GHz to 81GHz, which is used as the main anti-collision radar in front of the vehicle.
Operation principle of 77GHz millimeter-wave radar: 77GHz millimeter-wave radar continuously emits directionally directed millimeter-wave microwave in the corresponding band through transmitting antenna, which is reflected when the millimeter-wave microwave meets an obstacle target. Receiving the reflected millimeter wave through the receiving antenna of 77GHz millimeter wave radar, according to the wave band of the millimeter wave, combined with the change of the vehicle speed, Using the correlation formula to calculate the time of millimeter wave travelling in transit × speed of light 2, we can know the change of speed and direction of the front car, and then calculate the relative distance between the vehicle and the car in front. It is possible to grasp and monitor the position, distance and direction of the front car in real time.
Therefore, 77 GHz millimeter wave radar induces objects by sending and receiving reflected millimeter waves.
77GHz millimeter wave radar sensing features:
1. the distance is far, 150-200 meters.
2. strong anti-interference ability, not affected by rain and snow fog weather, stable work.
3. sensitive to metal material, detecting distance, position and direction.
