In-depth interpretation of intelligent vehicle on-board sensor calibration technology

Intelligent vehicle is an intelligent vehicle that integrates various advanced technologies, which not only has driving assistance and automatic driving functions, but also can realize intelligent networking, intelligent perception and intelligent interaction and other functions. The on-board sensor is an important part of intelligent vehicle, and its calibration technology is particularly important. This paper will deeply interpret the intelligent vehicle sensor calibration technology, including the definition, classification, significance and implementation methods of calibration technology.

Ⅰ. Definition and classification of calibration technology

Vehicle sensor calibration technology refers to the technology of accurate calibration of various sensors installed on the car during the automobile manufacturing process to ensure that the sensor can accurately and stably detect, measure and transmit the corresponding information. Sensor calibration is an important premise to ensure the normal operation of various functions of intelligent vehicles, and it is also a technical link that must be paid attention to in the development process of intelligent vehicles.

According to different sensor types, vehicle sensor calibration technology can be divided into the following categories:

1, inertial sensor calibration technology

Inertial sensor is a kind of sensor used to measure the motion state of the object, mainly including two types of accelerometer and gyroscope. The calibration technology of inertial sensor is to eliminate the error and noise by calibrating the response of the sensor, so as to improve the measurement accuracy and stability of the sensor.

2, vision sensor calibration technology

Vision sensor is a kind of sensor used to obtain image information, mainly including camera and lidar and other types. The calibration technology of vision sensor is to eliminate the distortion and error by calibrating the internal and external parameters of the sensor, so as to improve the measurement accuracy and stability of the sensor.

3. Millimeter wave radar calibration technology

Millimeter wave radar is a sensor used to detect and identify objects, mainly used in intelligent driving object detection and distance measurement and other functions. Millimeter wave radar calibration technology is to calibrate the transmitting and receiving parameters of radar to eliminate errors and interference, and then improve the detection accuracy and stability of radar.

Ⅱ, The significance of calibration technology

The significance of on-board sensor calibration technology is to ensure the measurement accuracy and stability of sensors, and then improve the reliability and safety of various functions of intelligent vehicles. Specifically, the significance of vehicle sensor calibration technology includes the following aspects:

1, improve the accuracy and safety of driver assistance and automatic driving

Driver assistance and autonomous driving are one of the core functions of smart cars, and on-board sensors are a key component in achieving these functions. By accurately calibrating the sensor, error and noise can be eliminated, the measurement accuracy and stability of the sensor can be improved, and the accuracy and safety of driver assistance and automatic driving can be improved.

2. Improve the effectiveness and reliability of intelligent perception and intelligent interaction

Intellisense and intelligent interaction are two other important functions of smart cars, which mainly rely on the precise measurement and transmission of sensors. By accurately calibrating the sensor, it can ensure that the sensor can accurately and stably detect and transmit the corresponding information, so as to improve the effect and reliability of intelligent perception and intelligent interaction.

3. Promote the development and popularization of the intelligent automobile industry

Intelligent vehicles are the development direction of the future automotive industry, and on-board sensor calibration technology is an essential link in the development process of intelligent vehicles. By continuously improving the accuracy and efficiency of calibration technology, it can promote the development and popularization of the intelligent automobile industry, and bring people a safer, convenient and comfortable travel experience.

Ⅲ, The realization method of calibration technology

The realization method of vehicle sensor calibration technology is more complicated, and generally needs to be operated by professional calibration equipment and software. Specifically, the implementation method of calibration technology includes the following steps:

1. Environment preparation

Before calibration, it is necessary to select a closed, flat and regular test site to ensure the stability and consistency of the test environment. At the same time, calibration equipment needs to be installed and connected to ensure the normal operation of the equipment.

2. Data collection

In the test site, different test schemes should be selected according to the actual needs, and data acquisition of sensors should be carried out. The methods of data acquisition are generally divided into static calibration and dynamic calibration, and the specific acquisition content includes the original data output by the sensor, attitude information, motion state, etc.

3. Calculation of calibration parameters

After the data collection is completed, it is necessary to calculate and process the collected data to get the calibration parameters. The calculation of calibration parameters generally includes internal parameters and external parameters. The internal parameters mainly include the model parameters, deviation and error of the sensor, and the external parameters mainly include the position, orientation and motion state of the sensor.

4. Verification of calibration results

After the calibration parameters are calculated, the calibration results need to be verified and adjusted to ensure the correctness and stability of the calibration results. The verification methods of calibration results are generally divided into quantitative verification and qualitative verification. The quantitative verification is mainly through comparison with the actual measurement results, and the qualitative verification is mainly through images, curves and other methods.

In short, vehicle sensor calibration technology is one of the essential links in the development process of intelligent vehicles, it can improve the measurement accuracy and stability of the sensor, and then improve the reliability and safety of various functions of intelligent vehicles. For intelligent automobile manufacturers and related technology enterprises, we should pay attention to the research and application of vehicle sensor calibration technology, constantly improve the accuracy and efficiency of calibration technology, and make greater contributions to the development and popularization of intelligent automobile industry.