Multi-Sensor Fusion Automotive Calibration Room with Scene-based Engineering Setup and Customized Services

The multi-sensor fusion calibration room for intelligent vehicles is a core infrastructure in the research, development, manufacturing, and after-sales maintenance of autonomous vehicles. Modern intelligent vehicles rely heavily on the collaborative work of multiple sensors — LiDAR, cameras, millimeter-wave radar, ultrasonic radar, and inertial navigation systems (GPS/IMU) — to "see" the world. Even minor mechanical installation errors or deformations caused by thermal expansion and contraction can lead to misalignment of data from different sensor coordinate systems. The calibration room is a precision control environment designed to completely solve this "alignment" problem.

During sensor assembly, vehicle body structural components and brackets may exhibit micron- or millimeter-level physical deviations. The calibration room is used to accurately measure and correct these initial deviations.

Sensor data from different physical locations and with different sensing principles — such as point cloud data from LiDAR and image pixels from cameras — is mapped to a unified three-dimensional coordinate system of the vehicle body, ensuring the accuracy and redundancy of perception fusion.

The system outputs high-precision intrinsic parameters (such as lens distortion and focal length) and extrinsic parameters (such as rotation matrix and translation vector), and verifies them through retesting to ensure the sensing system meets mass production and safety standards.

• Optical Darkroom / Constant Temperature and Humidity Control: To avoid interference from drastic changes in ambient light or temperature fluctuations affecting the camera and LiDAR, the calibration room typically features light-shielding, dustproof, and constant temperature characteristics.
• High-Precision Base Ground and Four-Wheel Alignment System: Ensures the vehicle is parked level and establishes an absolute vehicle reference coordinate system.

Equipped with dedicated multi-functional calibration boards — such as checkerboard, dot array, vertical boards, ArUco/AprilTag coded marker boards, and radar reflectors with specific geometric shapes — for accurate identification by both optical and laser equipment.

Integrating mechanical control mechanisms, machine vision automatic alignment algorithms, and background analysis software, this system automates the entire process from target recognition and feature extraction to automatic calculation of extrinsic parameters, significantly reducing errors caused by manual intervention.