What principle does the reversing radar utilize?
2 Answers
The principle utilized by the reversing radar is: Based on the principle that bats can fly at high speeds in the dark without colliding with any obstacles, the reversing radar was designed and developed. The display of the reversing radar is installed on the rearview mirror, continuously reminding the driver of the distance to objects behind the vehicle. When reaching a dangerous distance, the buzzer starts to sound, alerting the driver to the proximity of obstacles and prompting timely stopping. Here is a brief introduction about the reversing radar: (1) The full name of the reversing radar is "Reverse Anti-Collision Radar," also known as "Parking Assistance Device," or referred to as the reverse computer warning system. (2) It is a safety assistance device for parking or reversing vehicles, consisting of ultrasonic sensors (commonly known as probes), a controller, and a display (or buzzer), among other components. (3) It can inform the driver about surrounding obstacles through sound or more intuitive displays, eliminating the troubles caused by the driver's need to look around when parking, reversing, or starting the vehicle. It also helps the driver overcome the shortcomings of blind spots and blurred vision, enhancing driving safety.
The principle of the reversing radar is quite interesting—it operates using ultrasonic technology. When I reverse, the radar emitter sends out high-frequency sound waves, which are inaudible to the human ear. These waves hit obstacles like walls or cars behind me and bounce back. The receiver captures the echo signal and calculates the distance by measuring the time difference between emission and reception. The speed of sound is about 340 meters per second, making the calculation very accurate. After processing the signal, the system alerts me through beeps or a display: slow beeps indicate a distant obstacle, while rapid beeping means it's very close. This device makes parking much safer, especially in tight urban spaces. Expanding on this, the radar is usually installed on the rear bumper and can be blocked by mud, affecting accuracy, so I regularly clean the sensors to keep them functioning properly.
