Beidou satellite navigation system comprehensively supports the development of autonomous driving technology

On June 23, 2020, the Beidou-3 global satellite navigation system constellation deployment was fully completed. This global satellite navigation system, independently constructed and operated by my country, has begun to provide all-weather, all-weather, high-precision positioning, navigation and timing services to users around the world.

In the field of epidemic prevention and control, the Beidou satellite navigation system can provide meter-level location data for driverless sweeper vehicles. A driverless sweeper truck was unveiled in a community in Beijing. It looks like a small tank with a large spray volume and can clean 10,000 square meters per hour. Radar and more than ten binocular cameras are installed on the car body, which can identify obstacles ahead in 360 degrees without any obstacles. During driving, once it encounters obstacles or other vehicles, it can automatically slow down or brake, making it the most reliable vehicle in the entire community. Handsome boy.

A cleaning tool that liberates manpower. In recent years, the concept of "autonomous driving" has been in the ascendant, but this is just the tip of the iceberg for future vehicle transportation. Hospitals, communities, and high-speed rail station squares are all areas that require frequent disinfection operations. If manual work is used, operators need to wear bulky protective clothing, which results in low work efficiency and difficult to effectively protect the health and safety of personnel. At this time, our special "warrior" - the driverless sweeper truck, comes in handy.  

Safe and reliable "big man" First of all, China's Beidou satellite navigation system can provide meter-level positional accuracy for driverless sweeper vehicles. Then, the sweeper vehicle obtains positioning data from the roadside base station through real-time differential positioning technology (accuracy is centimeter level), and then uses the "gyroscope" built into the vehicle body to obtain status information such as its own acceleration and vehicle body orientation. The above process takes less than one second. Can be performed 10 times. During operation, how to avoid collisions, how to identify signal lights, and how to ensure that the vehicle body operation does not cross the boundary? This is not only the status information of the car body itself (such as the positioning and attitude mentioned above), but also the environmental information needs to be included in the perception.  

An "eye" is installed above and behind the head of the vehicle to detect targets ahead in real time, including two subtasks: object positioning and object classification, such as recognizing lane lines to adjust the vehicle's posture and identifying obstacles for planning. Obstacle avoidance route. A small radar (such as lidar) will be installed on the left and right ends of the car body head to measure the moving speed, distance and size of objects in front, and can instruct the on-board computer to execute commands such as "emergency stop" or "obstacle avoidance".

Although the above sensing methods are different, some sensing information can serve the same purpose, such as satellite positioning and computer vision for path planning, and computer vision and lidar for obstacle avoidance and emergency stopping. The purpose of this multi-sensor redundant sensing strategy is to achieve a higher level of safety and reliability. Walking is also a skill. As for the movement of driverless sweeper vehicles, assuming there is no external interference, its task is to rely on satellite positioning coordinates to move from the starting point to the end point. This process is called "tracking." When "tracking", the smoother the trajectory and the better the track fit, the more effectively it can respond to emergencies.  

The driverless sweeper vehicle uses reinforcement learning algorithms to optimize the driving route, and realizes wired control of power, steering, and braking through the control bus. Equipped with 5G remote driving technology, operators can also remotely monitor and control the externally operated driverless disinfection and sweeping vehicles at the driving control center dispatch station to achieve unmanned disinfection and spraying operations.  

Technology for good. As a comprehensive system that integrates environmental perception, planning and decision-making, vehicle-mounted interconnection terminals and control solutions, driverless sweeper vehicles will surely create a better and more efficient lifestyle for people.