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2016 IEEE Chinese Guidance, Navigation and Control Conference (CGNCC)最新文献

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Unmanned aerial vehicle based forest fire monitoring and detection using image processing technique 基于图像处理技术的无人机森林火灾监测与探测
Pub Date : 2016-08-01 DOI: 10.1109/CGNCC.2016.7829074
C. Yuan, K. Ghamry, Zhixiang Liu, Youmin Zhang
Early forest fire alarm systems are critical in making prompt response in the event of unexpected hazards. Cost-effective cameras, improvements in memory, and enhanced computation power have all enabled the design and real-time application of fire detecting algorithms using light and small-size embedded surveillance systems. This is vital in situations where the performance of traditional forest fire monitoring and detection techniques are unsatisfactory. This paper presents a forest fire monitoring and detection method with visual sensors onboard unmanned aerial vehicle (UAV). Both color and motion features of fire are adopted for the design of the studied forest fire detection strategies. This is for the purpose of improving fire detection performance, while reducing false alarm rates. Indoor experiments are conducted to demonstrate the effectiveness of the studied forest fire detection methodologies.
早期森林火灾报警系统对于在发生意外灾害时迅速作出反应至关重要。具有成本效益的摄像机、内存的改进和增强的计算能力都使使用轻型和小型嵌入式监视系统的火灾探测算法的设计和实时应用成为可能。在传统的森林火灾监测和探测技术不能令人满意的情况下,这是至关重要的。提出了一种基于视觉传感器的无人机森林火灾监测与探测方法。所研究的森林火灾探测策略的设计同时采用了火灾的颜色特征和运动特征。这是为了提高火灾探测性能,同时减少误报率。进行了室内实验,以证明所研究的森林火灾探测方法的有效性。
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引用次数: 30
Modeling of fingerprint characteristics of wireless communication channel 无线通信信道指纹特征建模
Pub Date : 2016-08-01 DOI: 10.1109/CGNCC.2016.7829051
Chunli Jiang, Zhenglin Li
A novel graphic modeling method of obtaining the fingerprint characteristics of wireless communication channel was provided in the paper. Firstly, discrete Fourier transforms was carried on to the sample data of each channel. And then a three-dimensional image was generated by taking the frequency as X coordinates, the channel number as Y coordinates, and the frequency amplitude as Z coordinates. After the image had been applied to mathematical interpolation, amplitude normalization, extended maximum value filtering, numerical binarization and burr elimination, a binary valued image with fingerprint feature is obtained. Application results showed that this type of fingerprint image can effectively distinguish different scenes of wireless communication.
提出了一种新的获取无线通信信道指纹特征的图形化建模方法。首先对各通道的采样数据进行离散傅里叶变换;然后以频率为X坐标,通道数为Y坐标,频率幅值为Z坐标,生成三维图像。对图像进行数学插值、幅度归一化、扩展最大值滤波、数值二值化和去毛刺等处理后,得到了具有指纹特征的二值图像。应用结果表明,该类型的指纹图像能够有效区分无线通信的不同场景。
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引用次数: 2
Astronomical image restoration using Bayesian methods 基于贝叶斯方法的天文图像恢复
Pub Date : 2016-08-01 DOI: 10.1109/CGNCC.2016.7828944
Xiaoping Shi, Rui Guo, Zicai Wang
This paper is devoted to the combination of several prior models in Bayesian image restoration and increasingly wide utilization in astronomical images. Bayesian methods introduce image models using prior knowledge and address the ill-posed problem in the registration parameter estimation. Employing a variational Bayesian analysis, we obtain a unique approximating distribution based on the observations that decreases the Kullback Leibler distance for more optimal posterior distribution. The estimated results on astronomical images experimentally provide higher quality and better restoration performance.
本文研究了几种先验模型在贝叶斯图像恢复中的结合以及在天文图像中日益广泛的应用。贝叶斯方法利用先验知识引入图像模型,解决了配准参数估计中的不适定问题。利用变分贝叶斯分析,我们得到了一个基于观测值的唯一近似分布,减小了Kullback Leibler距离以获得更优的后验分布。对天文图像的实验估计结果具有更高的质量和更好的恢复性能。
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引用次数: 0
Real-time obstacle avoidance for fixed-wing vehicles in complex environment 复杂环境下固定翼飞行器的实时避障
Pub Date : 2016-08-01 DOI: 10.1109/CGNCC.2016.7828835
Rong Ma, Wenrui Ma, Xiaolong Chen, Jia Li
In this paper, we present a real-time obstacle avoidance method for fixed-wing unmanned aerial vehicles (UAVs) in complex environment. The Rapidly-exploring Random Tree(RRT) algorithm is used in this method. In order to adapt the RRT algorithm on fixed-wing platforms, we make extensions on it. The algorithm demonstrates very good performance in trajectory planning for fixed-wing vehicles in three-dimensional environment and dynamic environment. We analyze the algorithm theoretically and provide simulation results. We also demonstrate our method on a fixed-wing vehicle flying over a runway with multiple obstacles. The application of this method will greatly improve the survival ability of fixed-wing vehicles in complex environment. It is significant in elevation of autonomous level of UAV.
提出了一种固定翼无人机在复杂环境下的实时避障方法。该方法采用快速探索随机树(RRT)算法。为了使RRT算法适应固定翼平台,我们对其进行了扩展。该算法对固定翼飞行器在三维环境和动态环境下的轨迹规划具有良好的性能。对算法进行了理论分析,并给出了仿真结果。我们还在一个固定翼飞行器上演示了我们的方法,该飞行器在有多个障碍物的跑道上飞行。该方法的应用将大大提高固定翼飞行器在复杂环境下的生存能力。这对提高无人机的自主水平具有重要意义。
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引用次数: 2
Research on adaptation criteria generation based on large data mining 基于大数据挖掘的自适应准则生成研究
Pub Date : 2016-08-01 DOI: 10.1109/CGNCC.2016.7828978
Hongwon Yun, Li Xu, Hao Dou, De-Lie Ming
This paper performs research on adaptation analysis based on large amount of multi-source remote sensing data. In view of different demands from different task background, the research is firstly focused on how to analyze the data in computer language. To achieve this, the feature parameters of target areas are extracted from different target area geographic data. In combination of ORACLE database engine, data mining technology is used to carry out the target area adaptation assessment, and extract corresponding adaptation criteria. We test the trained adaptation criteria on multi-source geographic information data of different target areas. Experimental results show that the resulting criterion has certain coincidence rate and robustness.
本文对基于大量多源遥感数据的自适应分析进行了研究。针对不同任务背景的不同需求,首先研究了如何用计算机语言对数据进行分析。为此,从不同的目标区域地理数据中提取目标区域的特征参数。结合ORACLE数据库引擎,利用数据挖掘技术对目标区域进行适应性评估,并提取相应的适应性准则。在不同目标区域的多源地理信息数据上对训练好的适应准则进行了测试。实验结果表明,所得准则具有一定的符合率和鲁棒性。
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引用次数: 0
Robust monocular vision navigation for spacecraft on-orbit service 航天器在轨服务鲁棒单目导航
Pub Date : 2016-08-01 DOI: 10.1109/CGNCC.2016.7829043
Chun Jiang, Yunhua Wu, Lin-Lin Ge, Bing Hua, Feng Yu, Zhiming Chen
Spacecraft on-orbit serving is vital important for future space missions and is of interest of many countries. Relative motion determination is the major problem for spacecraft on-orbit servicing. Due to the advantages of monocular vision navigation system, it has been widely proposed for spacecraft approaching for the final stage. However, due to the model uncertainty and state mobility of the target spacecraft, a strong tracking filter is proposed to overcome the above issues in estimating relative position and attitude. This article first introduces how to set up, select and match feature markers. Followed by establishing a 6DOF spacecraft dynamics model and an imaging observation model based on quaternion. Then, the recursive process of Suboptimal Fading Extended Kalman Filter is implemented. Finally, numerical simulations are carried out to verify the effectiveness of the proposed algorithm.
航天器在轨服务对未来的空间任务至关重要,是许多国家关注的问题。相对运动确定是航天器在轨维修的主要问题。由于单目视觉导航系统的优越性,它已被广泛应用于航天器末段接近。然而,由于模型的不确定性和目标航天器的状态可迁移性,在估计相对位置和姿态时,提出了一种强跟踪滤波器来克服上述问题。本文首先介绍如何设置、选择和匹配特征标记。其次,建立了六自由度航天器动力学模型和基于四元数的成像观测模型。然后,实现了次优衰落扩展卡尔曼滤波器的递归处理。最后,通过数值仿真验证了所提算法的有效性。
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引用次数: 0
Adaptive motion cueing algorithm based on fuzzy tuning for improving human sensation 基于模糊调优的自适应运动提示算法改善人的感觉
Pub Date : 2016-08-01 DOI: 10.1109/CGNCC.2016.7828958
Tang Zhiyong, Ma Hu, Pei Zhongcai, Z. Jinhui
As one of the key technologies of flight simulator, motion cueing algorithm (MCA) plays a great role in regenerating realistic motion and the similar human perception within physical limitations. Although it is the most popular MCAs, classic washout algorithm has some drawbacks, including distortion of the original signal, false cue motions, poor usage of the workspace and wrong human sensation. In order to overcome these problems and minimize human sensation error between the actual flight and simulator while exploiting the platform more efficiently within the motion constraints, this paper proposed a new method which adopt signal error compensators based on fuzzy logic online tuning. And the fuzzy tuning logic controller based on displacement, workspace limitation and the sensed specific force error. The proposed method also contains a non-linear scaling factor to adjust the amplitude of the input signal and uses partial range scaling of the tilt rate limiter to overcome the discontinuous movement. After simulating and analyzing, it shows the superiority of the proposed MCA as it decreases human sensation error to meet high fidelity and exploit platform workspace more efficiently within physical limitations to deliver realistic motion.
运动线索算法(MCA)作为飞行模拟器的关键技术之一,对于在物理限制条件下生成逼真的运动和相似的人类感知具有重要作用。经典的洗出算法虽然是最流行的MCAs,但它存在一些缺点,包括原始信号失真、线索运动错误、工作空间使用不当和人的感觉错误。为了克服这些问题,最大限度地减少实际飞行与模拟器之间的人的感觉误差,同时在运动约束条件下更有效地利用平台,本文提出了一种基于模糊逻辑在线整定的信号误差补偿方法。基于位移、工作空间限制和感知比力误差的模糊整定逻辑控制器。该方法还包含一个非线性缩放因子来调节输入信号的幅度,并使用倾斜限幅器的部分范围缩放来克服不连续运动。仿真分析结果表明,该方法在降低人的感觉误差,满足高保真度要求的同时,在物理限制下更有效地利用平台工作空间,实现了逼真的运动效果。
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引用次数: 5
Fuzzy sliding mode tracking control of the quadrotor unmanned aerial vehicle with unknown disturbances 未知扰动四旋翼无人机的模糊滑模跟踪控制
Pub Date : 2016-08-01 DOI: 10.1109/CGNCC.2016.7828947
Yong Wang, Ning Wang, Xiaoling Liang, M. Er
The quadrotor unmanned aerial vehicle (QUAV) is one of Vertical Take-Off and Landing (VTOL) autonomous aerial vehicles. More and more attention has been paid to the QUAV in recent years for simple mechanical structure and favorable control performance. In this paper, a sliding mode control framework is proposed to achieve the trajectory tracking control of the QUAV, whereby fuzzy uncertainty observer (FUO) is designed to estimate external disturbances and model uncertainties. As a consequence, the proposed fuzzy sliding mode control (FSMC) approach is able to handle system uncertainties and external disturbances simultaneously, and thereby contributing to better robustness. In addition to theoretical stability analysis, the robust performance of the proposed FSMC scheme is evaluated via numerical simulations.
四旋翼无人机(QUAV)是一种垂直起降(VTOL)自主飞行器。近年来,QUAV以其简单的机械结构和良好的控制性能受到越来越多的关注。本文提出了一种滑模控制框架来实现QUAV的轨迹跟踪控制,其中模糊不确定性观测器(FUO)用于估计外部干扰和模型不确定性。因此,所提出的模糊滑模控制(FSMC)方法能够同时处理系统的不确定性和外部干扰,从而具有更好的鲁棒性。除了理论稳定性分析外,还通过数值模拟评估了所提出的FSMC方案的鲁棒性。
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引用次数: 7
A study of aircraft-defense missile cooperative active defense technology 防空导弹协同主动防御技术研究
Pub Date : 2016-08-01 DOI: 10.1109/CGNCC.2016.7829083
Xiaoping Wang, Lutong Wang, Qin-ying Lin, Minghui Xia, Liangliang Chen
This paper introduced the implementation strategy of three points collinear active defense to realize aircraft active defense. Based on the kinetic characteristic of fighter, defending missile, offensive missile, a induce capture aircraft-defending missile synergy active defense method was put forward, which transform the complex air war confront problem between fighter and defending missile and offensive missile into a simple trajectory problem of fighter. A process performance index during the implementation process of active defense strategy was put forward and the different between process performance index and traditional performance index was analyzed. Because of the QPSO arithmetic is a off-line arithmetic, result in the whole process can't be able to be evaluate. So the method of RHC(receding horizon control) was used to maintain process performance index as the optimization index of every receding optimization window. Which solve the disadvantage of QPSO arithmetic and rise its real-time. Simulation was applied to prove the validity of active defense strategy and synergy method, and the effectiveness and accuracy of this arithmetic.
介绍了三点共线主动防御实现飞机主动防御的实施策略。根据战斗机、防御导弹、进攻导弹的运动特性,提出了诱导捕获机防导弹协同主动防御方法,将战斗机与防御导弹、进攻导弹之间复杂的空战对抗问题转化为简单的战斗机弹道问题。提出了主动防御战略实施过程中的过程绩效指标,并分析了过程绩效指标与传统绩效指标的区别。由于QPSO算法是一种离线算法,整个过程的结果无法评估。因此,采用后退水平控制(RHC)方法维持过程性能指标作为每个后退优化窗口的优化指标。解决了量子粒子群算法的缺点,提高了算法的实时性。通过仿真验证了主动防御策略和协同方法的有效性,以及该算法的有效性和准确性。
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引用次数: 0
Linear parameter varying control of unmanned quadrotor helicopter with mass variation and battery drainage 考虑质量变化和电池排水的四旋翼无人直升机线性参数变控制
Pub Date : 2016-08-01 DOI: 10.1109/CGNCC.2016.7829073
Zhixiang Liu, C. Yuan, Youmin Zhang
In this paper, a linear parameter varying (LPV) control technique is proposed for the control of unmanned quadrotor helicopter (UQH), compensating the adverse effects of system variations, such as mass changes due to payload grasping, carrying, and dropping as well as battery voltage variations caused by battery drainage. The magnitudes of these variations, in this study, are assumed to be obtainable from the estimation scheme or priori knowable. Based on the information of these system variations, a linear parameter dependent state-feedback controller in a convex polytopic LPV representation is devised so that the corresponding adverse effects can be counteracted. The system parameters that vary with time are then specified as the design parameters for LPV controller, while the ultimate control law can be obtained online employing the well-established linear matrix inequality (LMI) conditions. Finally, both simulation and experimental validations are conducted to demonstrate the performance of the proposed control method on an UQH undergoing the changes of payload mass and battery voltage.
针对无人四旋翼直升机(UQH)的控制问题,提出了一种线性变参数控制(LPV)技术,补偿了系统变化的不利影响,如载荷抓取、携带和下降引起的质量变化以及电池排水引起的电池电压变化。在本研究中,假设这些变化的大小可以从估计方案中获得或先验可知。基于这些系统变化的信息,设计了凸多边形LPV表示的线性参数相关状态反馈控制器,以抵消相应的不利影响。然后将随时间变化的系统参数作为LPV控制器的设计参数,利用建立的线性矩阵不等式(LMI)条件在线得到最终控制律。最后,通过仿真和实验验证了所提出的控制方法对负载质量和电池电压变化的UQH的控制性能。
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引用次数: 3
期刊
2016 IEEE Chinese Guidance, Navigation and Control Conference (CGNCC)
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