The simulation of a control system for the longitudinal axis of the rotary or fixed-wing unmanned aerial vehicles(UAVs)is demonstrated in this study.The control unit includes design considerations of two controllers t...The simulation of a control system for the longitudinal axis of the rotary or fixed-wing unmanned aerial vehicles(UAVs)is demonstrated in this study.The control unit includes design considerations of two controllers to provide robust stability,tracking of the proposed linear dynamics,an adequate set of proportional-integral-derivative(PID)controller gains,and a minimal cost function.The PID control and linear quadratic regulator(LQR)with or without full-state-observer were evaluated.An optimal control system is assumed to provide fast rise and settling time,minimize overshoot,and eliminate the steady-state error.The effectiveness of this approach was verified by a linear model of the UAV aircraft in the semi-dynamic simulation platform of Matlab/Simulink,in which the open-loop system was assessed in terms of flight robustness and reference tracking.The experimental results show that the proposed controllers effectively improve the configuration of the control system of the plant,maintain the sustainability of the dynamic flight model stability,and diminish the flight controller errors.The LQR provides robust stability,but it is not optimal in the transient phase of particular plant output.The PID control system can adjust the controller’s gains for optimal hovering(or stable slow flight)and is especially useful for the tracking system.Finally,comparing aircraft stability using PID and LQR controllers shows that the latter has less overshoot and a shorter settling time;in addition,all proposed controllers can be practically deployed as one UAV’s system,which can be handled as an exemplary model of the UAV flight management system.展开更多
为了更准确地计算出无人机对航母与飞机之间的通信干扰效能,提出一种OPNET Mod eler网络动态仿真和有效干扰压制区分析相结合的方法,建立了干扰条件下的网络拓扑结构,创建了处理器模型和节点模型,从进程层、节点层和网络层入手,建立了...为了更准确地计算出无人机对航母与飞机之间的通信干扰效能,提出一种OPNET Mod eler网络动态仿真和有效干扰压制区分析相结合的方法,建立了干扰条件下的网络拓扑结构,创建了处理器模型和节点模型,从进程层、节点层和网络层入手,建立了移动无线网络模型,对蓝军航母与飞机之间的通信干扰效能进行了仿真分析,绘制出无人机不同干扰功率条件下蓝方飞机通信受到干扰后的误码率曲线,并运用数字通信受干扰后的误码率效能度量标准,给出干扰无人机位置的变化时,蓝军航母与飞机之间的通信受到干扰的效果和等级,并得出三级干扰等级下通信干扰压制区的范围,为指挥员进行电子战作战筹划提供了决策依据。展开更多
With the great development of unmanned aircraft system(UAS)over the last decade,sense and avoid(SAA)system has been a crucial technology for integrating unmanned aircraft vehicle(UAV)into national airspace with reliab...With the great development of unmanned aircraft system(UAS)over the last decade,sense and avoid(SAA)system has been a crucial technology for integrating unmanned aircraft vehicle(UAV)into national airspace with reliable and safe operations.This paper mainly focuses on intruder detection for SAA system.A robust algorithm based on the combination of edge-boxes and spatial pyramid matching using sparse coding(sc-SPM)is presented.The algorithm is composed of three stages.First,edge-boxes method is adopted to obtain a large number of proposals;Second,the optimization program is presented to obtain intruder area-of-interest(ROI)regions;Third,sc-SPM is employed for feature representation of ROI regions and support vector machines(SVM)is adopted to detect the intruder.The algorithm is evaluated under different weather conditions.The recall reaches to 0.95 in dawn and sunny weather and 0.9 in cloudy weather.The experimental results indicate that the intruder detection algorithm is effective and robust with various weather under complex background.展开更多
The drone was developed with the use of unmanned aircraft systems in the initial military sector based on the combination of aerospace technology and information and communication technologies in a variety of usabilit...The drone was developed with the use of unmanned aircraft systems in the initial military sector based on the combination of aerospace technology and information and communication technologies in a variety of usability, including the civilian sectors. Developed for the field of reconnaissance, it is used in both civilian and police sectors as traffic monitoring and high altitude reconnaissance missions. It is used in broadcasting and surveillance, while continuously expanding into the areas of courier delivery and rescue missions. Based on the convergence of aviation technology such as various SW, sensor and flight control to utilize unmanned system and information communication technology, commercialization of related technology is being developed as a very diverse route.?In this paper, we propose and manufacture of?a VTOL UAV. Design process referred to the VTOL development process?that has been devised by us, and actual building of a UAV also applied the same VTOL development concept. In order to understand the aerodynamic characteristics of the aircraft, we have applied the aerodynamic design theory and used the CAE method that can replace the actual wind tunnel test. We tested the selection method and criteria for the internal modules that make up the UAV, and we were able to assemble the product. FW coding of flight control computer was conducted for VTOL control. In addition, we developed a LTE communication module for the long distance flight, and carried out flight experiments with GCS to observe and respond to the flight situation from the ground. Flight test results showed that stable transition flight was possible with broadband.?We could see that the actual performance results were met, compared to our development target values.展开更多
针对自主、协同、智能的无人蜂群电磁作战行动难以描述、刻画、建模与仿真的问题,首先以联合作战为背景,分析了无人蜂群电磁作战行动的层次化特征,并基于BNF(Backus-Naur form)描述了作战行动链。随后,分析了无人蜂群个体自主作战与群...针对自主、协同、智能的无人蜂群电磁作战行动难以描述、刻画、建模与仿真的问题,首先以联合作战为背景,分析了无人蜂群电磁作战行动的层次化特征,并基于BNF(Backus-Naur form)描述了作战行动链。随后,分析了无人蜂群个体自主作战与群体协同作战的行为特征,并以此为基础提出了基于RRA(rule,respond and algorithm)的无人蜂群电磁作战行为模型建模方法,给出建模具体流程与行为规则的形式化描述。再次,构建了个体电磁辐射源目标自主识别行为模型,以及群体电磁攻击协同目标分配行为模型,完成了RRA方法的具体实现。最后,通过作战仿真实验与算法验证实验,证明了本文建模思路与建模方法的合理性、有效性。展开更多
文摘The simulation of a control system for the longitudinal axis of the rotary or fixed-wing unmanned aerial vehicles(UAVs)is demonstrated in this study.The control unit includes design considerations of two controllers to provide robust stability,tracking of the proposed linear dynamics,an adequate set of proportional-integral-derivative(PID)controller gains,and a minimal cost function.The PID control and linear quadratic regulator(LQR)with or without full-state-observer were evaluated.An optimal control system is assumed to provide fast rise and settling time,minimize overshoot,and eliminate the steady-state error.The effectiveness of this approach was verified by a linear model of the UAV aircraft in the semi-dynamic simulation platform of Matlab/Simulink,in which the open-loop system was assessed in terms of flight robustness and reference tracking.The experimental results show that the proposed controllers effectively improve the configuration of the control system of the plant,maintain the sustainability of the dynamic flight model stability,and diminish the flight controller errors.The LQR provides robust stability,but it is not optimal in the transient phase of particular plant output.The PID control system can adjust the controller’s gains for optimal hovering(or stable slow flight)and is especially useful for the tracking system.Finally,comparing aircraft stability using PID and LQR controllers shows that the latter has less overshoot and a shorter settling time;in addition,all proposed controllers can be practically deployed as one UAV’s system,which can be handled as an exemplary model of the UAV flight management system.
文摘为了更准确地计算出无人机对航母与飞机之间的通信干扰效能,提出一种OPNET Mod eler网络动态仿真和有效干扰压制区分析相结合的方法,建立了干扰条件下的网络拓扑结构,创建了处理器模型和节点模型,从进程层、节点层和网络层入手,建立了移动无线网络模型,对蓝军航母与飞机之间的通信干扰效能进行了仿真分析,绘制出无人机不同干扰功率条件下蓝方飞机通信受到干扰后的误码率曲线,并运用数字通信受干扰后的误码率效能度量标准,给出干扰无人机位置的变化时,蓝军航母与飞机之间的通信受到干扰的效果和等级,并得出三级干扰等级下通信干扰压制区的范围,为指挥员进行电子战作战筹划提供了决策依据。
基金supported by the National Natural Science Foundation of China (Nos. 61673211, U1633105)the Fundamental Research Funds for the Central Universities of China (No. NP2019105)the Funding of Jiangsu Innovation Program for Graduation Education, Funding for Outstanding Doctoral Dissertation in NUAA (No.BCXJ18-11)
文摘With the great development of unmanned aircraft system(UAS)over the last decade,sense and avoid(SAA)system has been a crucial technology for integrating unmanned aircraft vehicle(UAV)into national airspace with reliable and safe operations.This paper mainly focuses on intruder detection for SAA system.A robust algorithm based on the combination of edge-boxes and spatial pyramid matching using sparse coding(sc-SPM)is presented.The algorithm is composed of three stages.First,edge-boxes method is adopted to obtain a large number of proposals;Second,the optimization program is presented to obtain intruder area-of-interest(ROI)regions;Third,sc-SPM is employed for feature representation of ROI regions and support vector machines(SVM)is adopted to detect the intruder.The algorithm is evaluated under different weather conditions.The recall reaches to 0.95 in dawn and sunny weather and 0.9 in cloudy weather.The experimental results indicate that the intruder detection algorithm is effective and robust with various weather under complex background.
文摘The drone was developed with the use of unmanned aircraft systems in the initial military sector based on the combination of aerospace technology and information and communication technologies in a variety of usability, including the civilian sectors. Developed for the field of reconnaissance, it is used in both civilian and police sectors as traffic monitoring and high altitude reconnaissance missions. It is used in broadcasting and surveillance, while continuously expanding into the areas of courier delivery and rescue missions. Based on the convergence of aviation technology such as various SW, sensor and flight control to utilize unmanned system and information communication technology, commercialization of related technology is being developed as a very diverse route.?In this paper, we propose and manufacture of?a VTOL UAV. Design process referred to the VTOL development process?that has been devised by us, and actual building of a UAV also applied the same VTOL development concept. In order to understand the aerodynamic characteristics of the aircraft, we have applied the aerodynamic design theory and used the CAE method that can replace the actual wind tunnel test. We tested the selection method and criteria for the internal modules that make up the UAV, and we were able to assemble the product. FW coding of flight control computer was conducted for VTOL control. In addition, we developed a LTE communication module for the long distance flight, and carried out flight experiments with GCS to observe and respond to the flight situation from the ground. Flight test results showed that stable transition flight was possible with broadband.?We could see that the actual performance results were met, compared to our development target values.
文摘针对自主、协同、智能的无人蜂群电磁作战行动难以描述、刻画、建模与仿真的问题,首先以联合作战为背景,分析了无人蜂群电磁作战行动的层次化特征,并基于BNF(Backus-Naur form)描述了作战行动链。随后,分析了无人蜂群个体自主作战与群体协同作战的行为特征,并以此为基础提出了基于RRA(rule,respond and algorithm)的无人蜂群电磁作战行为模型建模方法,给出建模具体流程与行为规则的形式化描述。再次,构建了个体电磁辐射源目标自主识别行为模型,以及群体电磁攻击协同目标分配行为模型,完成了RRA方法的具体实现。最后,通过作战仿真实验与算法验证实验,证明了本文建模思路与建模方法的合理性、有效性。
