Autonomous driving interferes with light sources

Autonomous driving interferes with light sources

Relationship between auto drive system and light source interference

The auto drive system relies on a variety of sensors to sense the surrounding environment, among which laser radar, camera and millimeter wave radar are key components. Lidar constructs a three-dimensional model of the surrounding environment by emitting and receiving laser beams; The camera can capture visual images and recognize targets such as traffic signs, vehicles, and pedestrians; Millimeter wave radar is mainly used to detect the distance, velocity, and angle of target objects. These sensors may be affected by interfering light sources during operation.

The interference light source will emit light to the surrounding space, which may be received by the sensors of the auto drive system, thus interfering with the information obtained by the sensors and affecting the accurate judgment of the auto drive system on the surrounding environment.

Common interference light sources and their characteristics

sunlight:

Sunlight is a powerful natural light source with a wide spectral range, including ultraviolet, visible, and infrared rays. Under different weather conditions, such as sunny, cloudy, or sunset, the intensity and angle of sunlight will change.

For the camera of the auto drive system, strong sunlight may lead to overexposure of the image, making it difficult for the camera to distinguish the details of the target object. For example, when the sun shines directly on the camera lens at sunrise or sunset, bright spots will appear in the picture, covering the image of other objects. For laser radar and millimeter wave radar, the infrared part of solar radiation may also cause interference, especially for laser radar operating in the infrared band.

Vehicle headlights:

Vehicle headlights include low beam and high beam, mainly used for night lighting. The light from the low beam is relatively concentrated within a certain range in front of the vehicle, while the high beam can illuminate a farther distance, but the distribution of light is more scattered.

When autonomous vehicles encounter oncoming vehicles turning on high beams, strong light may temporarily blind the camera, just like the human eye being exposed to strong light, causing the camera to be unable to capture images properly. At the same time, the light emitted by the headlights may also interfere with the laser radar's reception and processing of reflected light, causing errors in the laser radar's judgment of the distance and position of surrounding objects.

Traffic signal lights and billboard lights:

Traffic lights have bright colors and high brightness, and their main purpose is to guide traffic. Billboard lights are designed to attract people's attention and typically have high brightness and various colors.

These lights may cause color deviation or halo of auto drive system camera. For example, when the red light of a traffic signal is too strong, the camera may mistakenly judge the color of surrounding objects as red. For LiDAR, scattered light around these lights may enter the receiving end of the LiDAR and interfere with its normal operation.

Influence of interference light source on auto drive system

Sensor performance degradation:

The image quality of the camera decreases, resulting in overexposure, color cast, halo, and other phenomena that affect the recognition of target objects. For example, at night, if the camera is disturbed by strong light, it may blur the image of pedestrians or obstacles, making it difficult to accurately identify their shape and location.

The measurement accuracy of LiDAR is affected, and interference light may cause the LiDAR to receive incorrect reflected light signals, resulting in errors in distance and angle measurements. For example, in the presence of strong light interference, LiDAR may misjudge the distance between the vehicle and obstacles, increasing the risk of collision.

Although millimeter wave radar is relatively less affected by optical interference, strong light exposure may affect the performance of its electronic components or cause signal fluctuations due to electromagnetic interference caused by light radiation.

Environmental perception error:

The auto drive system has a deviation in its understanding of the surrounding environment, which may mistake the interference light source itself for the target object, or fail to correctly identify the real target object. For example, due to interference from billboard lights, the shape of the billboard may be incorrectly identified as an obstacle on the road, or pedestrians behind the billboard may be ignored.

Errors in judging traffic scenarios, such as incorrectly assessing the status of traffic signals, may lead to vehicles making incorrect driving decisions, such as running red lights and other dangerous behaviors.

Autonomous driving interferes with light sourcesMain parameters

Working distance6-15m；

Illuminance of light source:6ten thousandlux, adjustable intensity;

Light uniformity and sex:90%-98%；

Spot diameter0.6-3.5mAdjustable circular area;

Color temperature range:3000K/6000Kswitch,Simulate sunset and normal daytime;

Spectral range: visible light and near-infrared spectra, where the energy of the infrared spectrum matches that of the solar spectrum;

Light intensity: meets0.4-0.6SUNIt can achieve one click adjustment, such as sunny, cloudy, sunrise, sunset, etc;

Environmental protection: applicable to working rings such as rainstorm and fogrealm-IP65；

Project application:The testing of unmanned vehicle mounted cameras and radars is suitable for scenarios where vehicles encounter strong light when exiting tunnels or corners, and is tested in conjunction with rain and fog environments. Test the brightness adjustment of the LCD screen in the car after lighting, and test the brightness adjustment response of the LCD screen.

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