共查询到16条相似文献,搜索用时 125 毫秒
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提出一种新的基于传感器信息的自治式水下机器人(AUV)动态避障方法。介绍了传感器的工作原理。通过栅格法把传感器采集的AUV运行环境障碍信息进行合理描述,并预测动态障碍物的速度,保证AUV能够根据传感器信息躲避障碍物,达到航行要求。最后,通过仿真实验对机器人自主避障能力进行了验证。 相似文献
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针对传统三维声纳成像系统集成度低、实时性差的问题,提出一种手持式三维声纳实时成像系统设计方案。利用DM8127实现声纳图像的处理,通过坐标转换数组预生成、自适应阈值的网格构建等方法实现实时高精度的三维建模,同时采用多线程并行处理架构改善网格构建时的系统处理性能,降低处理时延,并利用Open GL ES2.0实现三维声纳图像的渲染和显示。实验结果证明,该系统能清晰显示水下探测目标,且实时成像速率高达25帧/s,满足系统实时性要求。 相似文献
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利用自主式水下航行器(Autonomous Underwater Vehicle, AUV)对水下多目标进行协同探测是目前海洋技术领域的研究热点。本文主要研究在水下三维区间内的多AUV任务分配与协作探测机制,建立了以每个AUV能量耗费与能耗均衡为约束条件的水下三维空间中的多旅行商(Multiple Traveling Salesman Problem, MTSP)问题模型,利用遗传算法(Genetic Algorithm, GA)对该NP-Complete问题进行启发式求解,同时设计了考虑巡航总路径及访问目标数的适应度函数以提高多AUV间的能耗均衡性,实现多个AUV对多个水下目标的优化协同探测。最后本文利用Matlab R2014a软件对多AUV任务协作与多目标探测机制进行了仿真,仿真结果验证了该方法能够均衡多AUV多目标探测问题的能量消耗,进而提高巡航速度和生命周期。 相似文献
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利用自主式水下航行器(Autonomous Underwater Vehicle,AUV)对水下多目标进行协同探测是目前海洋技术领域的研究热点.主要研究在水下三维区间内的多AUV任务分配与协作探测路径规划机制,建立了以每个AUV能量耗费与能耗均衡为约束条件的水下三维空间中的多旅行商MTSP(Multiple Traveling Salesman Problem)问题模型,利用遗传算法GA(Genetic Algorithm)对该NP-Complete问题进行启发式求解,同时设计了考虑巡航总路径及访问目标数的适应度函数以提高多AUV间的能耗均衡性,实现多个AUV对多个水下目标的优化协同探测.最后本文利用MATLAB R2014a软件对多AUV任务协作与多目标探测路径规划机制进行了仿真,仿真结果验证了本文方法能均衡多AUV多目标探测问题的能量消耗,进而提高巡航速度和生命周期. 相似文献
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基于前视声纳信息的AUV避碰规划方法 总被引:2,自引:0,他引:2
提出了基于实时前视声纳信息实现AUV避碰规划的框架.整个避碰规划系统包括声纳探测目标、目标跟踪、特征信息提取、目标运动估计、避碰算法等部分.在小型局域网仿真系统上仿真表明,该控制方法使得AUV能够较好的实现对静止目标和运动目标的避碰. 相似文献
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针对复杂海洋环境下的自治水下机器人(Autonomous underwater vehicle, AUV)三维避障问题, 本文提出了一种高效的修正导航向量场方法.构建自由空间下的初始导航向量场, 引导AUV以最短路径向目标点航行.定义修正矩阵来量化描述障碍物对初始导航向量场的影响, 得到障碍空间下的修正导航向量场, 使得AUV向目标点航行的同时躲避静态障碍.通过结合障碍物运动速度, 分别构建相对初始导航向量场与相对修正导航向量场, 并采取有限时域推演与调整策略, 最终引导AUV安全躲避动态障碍.仿真结果表明, 本方法能较好地应用于复杂海洋环境下的AUV避障任务. 相似文献
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Jonghoek Kim 《Asian journal of control》2023,25(4):2641-2654
Consider the case where autonomous underwater vehicles (AUVs) are deployed to monitor a 3D underwater environment. This paper tackles the problem of guiding all AUVs to the destination while not colliding with a priori unknown 3D obstacles. Suppose that among all AUVs, only the leader AUV has an ability of locating itself, while accessing a destination location. A follower, an AUV that is not a leader, has no sensors for locating itself. Every follower can only measure the relative position of its neighbor AUVs utilizing its sonar sensors. Our paper addresses distributed controls, so that multiple followers track the leader while preserving communication connectivity. We design controls, so that all AUVs reach the destination safely, while maintaining connectivity in cluttered 3D environments. To the best of our knowledge, our article is novel in developing 3D underwater guidance controls, so that all AUVs equipped with sonar sensors are guided to reach a destination in a priori unknown cluttered environments. MATLAB simulations are used to validate the proposed guidance scheme in underwater environments with many obstacles. 相似文献
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A robust obstacle detection and avoidance system is essential for long term autonomy of autonomous underwater vehicles (AUVs). Forward looking sonars are usually used to detect and localize obstacles. However, high amounts of background noise and clutter present in underwater environments makes it difficult to detect obstacles reliably. Moreover, lack of GPS signals in underwater environments leads to poor localization of the AUV. This translates to uncertainty in the position of the obstacle relative to a global frame of reference. We propose an obstacle detection and avoidance algorithm for AUVs which differs from existing techniques in two aspects. First, we use a local occupancy grid that is attached to the body frame of the AUV, and not to the global frame in order to localize the obstacle accurately with respect to the AUV alone. Second, our technique adopts a probabilistic framework which makes use of probabilities of detection and false alarm to deal with the high amounts of noise and clutter present in the sonar data. This local probabilistic occupancy grid is used to extract potential obstacles which are then sent to the command and control (C2) system of the AUV. The C2 system checks for possible collision and carries out an evasive maneuver accordingly. Experiments are carried out to show the viability of the proposed algorithm. 相似文献
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针对传统三维声纳装置体积庞大、设备沉重,在水下难以灵活作业的问题,设计了水下便携式三维声纳实时成像系统。通过现场可编程门阵列( FPGA)控制多路信号同步采样,优化波束形成算法大幅提高声纳信号处理速度,同时采用基于低功耗的数字媒体处理器以并行处理方式实时完成三维建模和图像显示。实验结果表明:系统续航时间可达4 h,水下零重量,可在40 m范围内实现角度分辨率1.2°的三维成像,图像刷新率可达25帧/s。 相似文献