What Principle Does the Reversing Radar Utilize?
3 Answers
Reversing radar is a device designed and developed based on the principle that bats can fly at high speeds in the dark without colliding with any obstacles. Here is an introduction to the reversing radar: 1. The full name of the reversing radar is 'Reverse Anti-Collision Radar,' also known as 'Parking Assistance Device.' It is a safety auxiliary device used when parking or reversing a car. 2. It consists of ultrasonic sensors (commonly known as probes), a controller, and a display (or buzzer). 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 blind spots and unclear vision, thereby improving driving safety. 4. The probes are installed on the rear bumper and can radiate within a maximum horizontal range of 120 degrees and a vertical range of 70 degrees to search for targets in all directions. Its greatest advantage is the ability to detect obstacles below the bumper that are difficult for the driver to see from the rear window, such as flower beds, curbs, or children playing behind the car, and to alert the driver.
The reversing radar is essentially a device that utilizes ultrasonic technology to detect the distance of obstacles. It is installed on the rear bumper of the car and activates when you engage reverse gear. The ultrasonic transmitter emits high-frequency sound waves, which reflect off objects behind the car such as walls, curbs, or other obstacles. The receiver captures these echoes and calculates the time difference between emission and reception. Given that sound waves travel at approximately 340 meters per second in air, dividing the time difference by this speed gives the distance. The system then controls the frequency of the alarm based on this distance—the closer the obstacle, the more urgent the beeping—helping you judge parking positions. This principle ensures all-weather functionality, working even in rainy conditions. However, it may occasionally miss small obstacles like tree branches or low steps, which is why many people now prefer to use it in combination with a reversing camera for improved accuracy. Overall, it significantly reduces the risk of scratches and is particularly convenient for novice drivers.
When driving, I rely entirely on the parking sensors to avoid a lot of trouble! They work by emitting ultrasonic waves to detect obstacles behind the car. The signals bounce back when they hit a wall or parking space, and the device calculates the distance based on the round-trip time. The system is installed on the rear sensors and starts scanning as soon as you reverse. When the distance is close, the alarm keeps beeping to remind you of the parking position. This has been especially useful for parking in narrow alleys in my neighborhood—without the sensors, I used to bump into trash bins all the time. However, it's important to note that rain or dirt covering the sensors can cause false alarms, so regular cleaning is necessary to keep them functioning properly. Modern car models are updated quite quickly, and many now integrate a camera display, making reversing even more reassuring. As a daily user, I think the biggest benefit is the increased sense of security, especially in low-light conditions at night.
