Range and Velocity Measurement in ACC

Title: Range and Velocity Measurement in ACC

As the automotive industry continues to evolve, so does the technology used for autonomous driving. One of the key components of autonomous driving is the ability to accurately measure range and velocity of objects on the road. This is where millimeter wave radar (mmWave radar) comes into play. In this blog post, we will explore how mmWave radar is used for range and velocity measurement in ACC (Adaptive Cruise Control).

Introduction

Millimeter wave radar is a type of radar that operates at frequencies above 30 GHz. It has a longer wavelength than traditional radar, which means it can detect objects with higher resolution and speed. In addition, mmWave radar can operate in extreme weather conditions such as rain, fog, and snow, making it ideal for use in autonomous driving.

Range Measurement

The range measurement capability of mmWave radar allows vehicles to accurately determine the distance between themselves and other objects on the road. This information is crucial for safe navigation and collision avoidance. The range measurement is done by transmitting a pulse of microwave radiation towards the target object and measuring the time it takes for the echo to return. By comparing the time it takes for the echo to return with the time it took for the pulse to travel to the target object, the vehicle can calculate its distance from the object.

In ACC, range measurement is used to maintain a safe following distance between the vehicle and the vehicle in front. The vehicle’s mmWave radar sends out a pulse of microwave radiation towards the vehicle in front, and measures the time it takes for the echo to return. Based on this information, the vehicle’s control system can adjust its speed and position to maintain a safe following distance.

Velocity Measurement

The velocity measurement capability of mmWave radar allows vehicles to accurately determine the speed of objects on the road. This information is crucial for safe navigation and collision avoidance. The velocity measurement is done by transmitting a pulse of microwave radiation towards the target object and measuring the time it takes for the echo to return. By comparing the time it takes for the echo to return with the time it took for the pulse to travel to the target object, the vehicle can calculate its velocity relative to the object.

In ACC, velocity measurement is used to maintain a safe following distance between the vehicle and the vehicle in front. The vehicle’s mmWave radar sends out a pulse of microwave radiation towards the vehicle in front, and measures the time it takes for the echo to return. Based on this information, the vehicle’s control system can adjust its speed and position to maintain a safe following distance.

Conclusion

Millimeter wave radar is an essential component of autonomous driving technology, particularly for range and velocity measurement in ACC. Its long wavelength and high frequency allow it to detect objects with higher resolution and speed, making it ideal for use in extreme weather conditions. As the technology continues to evolve, we can expect even more advanced applications of mmWave radar in autonomous driving.