Abstract We experimentally investigate the periodic vortex shedding dynamics in a highly oblate Bose–Einstein condensate using moving penetrable Gaussian obstacle. The frequency f v is measured as function of obstacle velocity and characterized by linear relationship = ( ? c ) with being critical velocity. proportionality constant linearly decreased decrease strength, whereas approaches speed s...

Tracking moving ground targets using unmanned air vehicles (UAVs) has important applications in several areas. Keeping a close line of sight from a UAV to a target in a densely populated area is a challenging task because of many constraints. An algorithm for several UAVs to track a moving target cooperatively is proposed. From random samples on the ground and obstacles, a cost inversely propor...

We present a new method for obstacle and pedestrian detection with lower computation complexity and higher detection performance on a small target. By calculating stereo disparity according to the road parameters, our system efficiently detects objects above the ground. Experiments on over 10,000 images captured in urban areas demonstrate our method’s effectiveness. We also propose a multi-scal...

Compared with the space fixed feature of traditional wireless sensor network (WSN), mobile WSN has better robustness and adaptability in unknown environment, so that it is always applied in the research of target tracking. In order to reach the target, the nodes group should find a self-adaptive method to avoid the obstacles together in their moving directions. Previous methods, which were base...

The excitations of nonlinear electrostatic ion cyclotron waves arising from a steadily moving charged obstacle are investigated in collisionless plasmas. In the weakly and dispersive limit, it is shown that obstacle-induced can be described by forced Ostrovsky-type model equation. exact analytical solution predicts equation does have periodic for specific analytic form obstacle. computational r...

Providing safety guarantees for autonomous vehicle navigation is an ultimate goal for motion planning in dynamic environments. However, due to factors such as robot and obstacle dynamics, e.g., speed and nonlinearity, obstacle motion uncertainties, and a large number of moving obstacles, identifying complete motion planning solutions with collision-free safety guarantees is practically unachiev...

!llis paper presents a new approach for rot)ot ]notion planning in dynamic environments, based on the concept of Velocity Obstacle. ,4 velocity obstacle defines the set of robot velocities that would result in a collision between tlie robot and an obstacle moving at a given velocity. The avoidance maneuver a{ a specific time is thus computed by selecting robot’s velocities out of that set. ~’ll...

This paper presents a representation of static and moving obstacles, using Velocity Obstacles (VO), for on-line planning in dynamic environments. Each obstacle is mapped to forbidden states by selecting a proper time horizon for the velocity obstacle. The proper choice of the time horizon ensures that the boundary of the mapped obstacle overlaps with the boundary of the set of inevitable collis...