基于极大化思想的无人机安全避障域识别算法

王家亮; 董楷; 顾兆军; 陈辉; 韩强

doi:10.3969/j.issn.0258-2724.20220262

基于极大化思想的无人机安全避障域识别算法

doi: 10.3969/j.issn.0258-2724.20220262

王家亮^1,,
董楷^{1, 2,},
顾兆军^2, ,,
陈辉^{1, 2},
韩强^{1, 2}

1.
中国民航大学计算机科学与技术学院，天津 300300
2.
中国民航大学信息安全测评中心，天津 300300

基金项目: 天津市教委科研计划（2020KJ026）

详细信息

作者简介:
王家亮（1983—），男，讲师，博士，研究方向为民航信息系统、嵌入式系统，E-mail：jl-wang@cauc.edu.cn

通讯作者:
顾兆军（1966—），男，教授，博士，研究方向为网络与信息安全、民航信息系统，E-mail：zjgu@cauc.edu.cn

中图分类号: TP391.41；V279；V249
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- 文章访问数: 305
- HTML全文浏览量: 48
- PDF下载量: 55
- 被引次数: 0
出版历程
- 收稿日期: 2022-04-20
- 修回日期: 2022-12-16
- 网络出版日期: 2023-10-12
- 刊出日期: 2023-01-23

Recognition Algorithm of Safe Obstacle Avoidance Domain for UAVs Based on Maximization Idea

WANG Jialiang^1
,,
DONG Kai^{1, 2
,},
GU Zhaojun^{2
, ,},
CHEN Hui^{1, 2},
HAN Qiang^{1, 2}

1.
School of Computer Science and Technology, Civil Aviation University of China, Tianjin 300300, China
2.
Information Security Assessment Center of Civil Aviation University of China, Tianjin 300300, China

摘要

摘要:
为提高四轴飞行器避障的准确性与实时性，提出一种结合LK （Lucas-Kanade）光流法和极大化思想的四轴飞行器避障算法. 首先，对四轴飞行器采集的视频流进行预处理，得到图像帧；其次，通过LK光流法剔除图像帧中光流小于阈值的角点，采用基于角点距离的聚类算法对角点进行分组，并计算出每组角点的外包轮廓；然后，利用基于极大化思想的安全避障域算法计算最优通行区域，进一步根据避障域求得偏差数据；最后，将偏差数据输入比例微分（PD）控制器得到控制信息，并发送控制指令使四轴飞行器及时调整飞行姿态，完成避障飞行. 通过特洛（Tello）四轴飞行器进行不同场景的实验表明，本文所提出的算法计算每帧图像最优安全避障域平均所需时间为0.17 s，既满足无人机避障实时性要求，又解决了识别障碍物区域与计算安全避障域问题.
- 极大化思想 /
- 安全避障域 /
- 四轴飞行器
Abstract:
In order to improve the accuracy and real-time performance of obstacle avoidance for quad-rotor helicopters, an obstacle avoidance algorithm combining the Lucas-Kanade (LK) optical flow method and maximization idea was proposed. Firstly, the video stream collected by the quad-rotor helicopter was preprocessed to obtain the image frame. Secondly, corner points whose optical flow was less than the threshold value in the image frame were eliminated by the LK optical flow method, and corner points were grouped by a clustering algorithm based on corner point distance. In addition, the outsourcing contour of each group of corner points was calculated. Then, the safe obstacle avoidance domain algorithm based on the maximization idea was used to calculate the optimal passing domain, and the deviation data were obtained according to the obstacle avoidance domain. Finally, the deviation data were input to the proportional and differential (PD) controller to obtain the control information, and the control command was sent to make the quad-rotor helicopter adjust the flight attitude in time to complete the obstacle avoidance flight. Experiments on the Tello quad-rotor helicopter in different scenes show that the proposed algorithm takes an average of 0.17 seconds to calculate the optimal safe obstacle avoidance domain for each frame of the image, which meets the real-time requirements of unmanned aerial vehicle (UAV) obstacle avoidance and solves the problem of identifying obstacle domains and calculating safe obstacle avoidance domain.
- maximization idea /
- safe obstacle avoidance domain /
- quad-rotor helicopter

HTML全文

图 1 四轴飞行器动力模型

Figure 1. Dynamic model of quad-rotor helicopter

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图 2 障碍物识别流程

Figure 2. Flow chart of obstacle recognition

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图 3 障碍物角点识别效果

Figure 3. Effect of obstacle corner point recognition

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图 4 障碍物轮廓识别效果

Figure 4. Recognition effect of obstacle contour

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图 5 系统结构

Figure 5. System structure

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图 6 标记障碍物矩形

Figure 6. Marked obstacle rectangle

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图 7 通行区域分析

Figure 7. Passing domain analysis

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图 8 通行区域分析结果

Figure 8. Passing domain analysis result

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图 9 PD控制避障示意

Figure 9. Obstacle avoidance by PD control

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图 10 实验场景

Figure 10. Experimental scenes

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图 11 躲避多组障碍物实验（实验1）

Figure 11. Experiment of avoiding multiple groups of obstacles (experiment 1)

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图 12 四轴飞行器数据结果（实验1）

Figure 12. Quad-rotor helicopter data results (experiment 1)

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图 13 复杂障碍物避障实验（实验2）

Figure 13. Experiment of avoiding complex obstacles (experiment 2)

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图 14 复杂障碍物避障实验（实验3）

Figure 14. Experiment of avoiding complex obstacles (experiment 3)

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图 15 处理时间对比

Figure 15. Comparison of processing time

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图 16 通行区域面积对比

Figure 16. Comparison of passing domain area

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