coverage is a fundamental problem of WSN, which *** the performance of sensing in wireless sensor network. The high density network is made up of low-power tiny sensors. At the guarantee of area coverage, how to prolo...
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coverage is a fundamental problem of WSN, which *** the performance of sensing in wireless sensor network. The high density network is made up of low-power tiny sensors. At the guarantee of area coverage, how to prolong the lifetime of network is a problem needs solving. And the method of choosing part of sensors to perform the sense task is adopted for full area coverage to achieve the object, and the other sensors are set into the sleepy state. For the irregular sensing model, the method of choosing neighbor sensors for enlarge the area of coverage is proposed in this paper. And the space resource of wireless sensor network is utilized optimally. Then the sensing, data obtaining and processing tasks are performed. At the end the simulation is performed and the overview of development is discussed.
The need for high resolution, continuously sustained imaging drives the interestin space-borne, distributed aperture, interferometric (amplitude, heterodyne, orintensity correlation) systems. This paper will discuss t...
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The need for high resolution, continuously sustained imaging drives the interest
in space-borne, distributed aperture, interferometric (amplitude, heterodyne, or
intensity correlation) systems. This paper will discuss the maneuver controls for a
system of multiple space-based telescopes to secure optimal image quality. Such distributed
aperture systems eff ectively measure the Fourier Transform of the collected
light so that the observed wave pattern is seen in the frequency plane. This Fourier
Transform representation of physical spacecraft maneuvers may be interpreted as
coverage regions (discs) in the frequency plane. Superior coverage of the frequency
plane, which is directly related to image quality, is investigated for imaging distant
objects using interferometric techniques where apertures are distributed on multiple
space-based telescopes. The corresponding cost function is based on the optimality of
the spacecraft maneuvers, which in turn is based on achieving a high image quality.
This study builds on previous research wherein the first-order necessary conditions
(FONC) were derived. The FONC are derived for specialized rectilinear motion
and expanded to incorporate varying coverage disc velocities. These linearized equations
are verifi ed to be consistent with those for the constant velocity case. Next,
linearized first-order necessary conditions are shown to correspond closely with the
fully nonlinear case. After that, the conditions for optimal overlap of the coverage
paths will be given; these conditions lead to the optimal cost based on frequency plane
parameters. Finally, a heuristic approach will be used to compare diff erent frequency plane coverage strategies. An analogy to painting will be presented to demonstrate
adequate signal-to-noise ratio required for a desired image quality.
To level up the application of wireless sensor network in cotton field soil monitoring, wireless sensor network technology has been studied deeply. Some difficulties, including the design of soil moisture sensor, cove...
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ISBN:
(纸本)9781441902122
To level up the application of wireless sensor network in cotton field soil monitoring, wireless sensor network technology has been studied deeply. Some difficulties, including the design of soil moisture sensor, covering problem in wireless sensor network and diagnosis algorithm for wireless sensor networks and node, are been proposed and discussed. Combined with cotton field soil moisture monitoring application, coverage and deployment based not only on plane space but also on time are been discussed and a fault diagnosis algorithm based on entropy is been put forward in the article.
This paper discusses the problem of building efficient coverage paths for a team of robots. An efficient multi-robot coverage algorithm should result in a coverage path for every robot, such that the union of all path...
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This paper discusses the problem of building efficient coverage paths for a team of robots. An efficient multi-robot coverage algorithm should result in a coverage path for every robot, such that the union of all paths generates a full coverage of the terrain and the total coverage time is minimized. A method underlying several coverage algorithms, suggests the use of spanning trees as base for creating coverage paths. However, overall performance of the coverage is heavily dependent on the given spanning tree. This paper focuses on the challenge of constructing a coverage spanning tree for both online and offline coverage that minimizes the time to complete coverage. Our general approach involves building a spanning tree by growing sub-trees from the initial location of the robots. This paper first describes a polynomial time tree-construction algorithm for offline coverage. The use of this algorithm is shown by extensive simulations to significantly improve the coverage time of the terrain even when used as a basis for a simple, inefficient, coverage algorithm. Second, this paper provides an algorithm for online coverage of a finite terrain based on spanning-trees, that is complete and guarantees linear time coverage with no redundancy in the coverage. In addition, the solutions proposed by this paper guarantee robustness to failing robots: the offline trees are used as base for robust multi-robot coverage algorithms, and the online algorithm is proven to be robust.
Thousands of storage tanks in off refineries have to be inspected manually to prevent leakage and/or any other potential catastrophe. A wall climbing robot with permanent magnet adhesion mechanism equipped with nondes...
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ISBN:
(纸本)9781424405701
Thousands of storage tanks in off refineries have to be inspected manually to prevent leakage and/or any other potential catastrophe. A wall climbing robot with permanent magnet adhesion mechanism equipped with nondestructive sensor has been designed. The robot can be operated autonomously or manually. In autonomous mode the robot uses an ingenious coverage algorithm based on distance transform function to navigate itself over the tank surface in a back and forth motion to scan the external wall for the possible faults using sensors without any human intervention. In manual mode the robot can be navigated wirelessly from the ground station to any location of interest Preliminary experiment has been carried out to test the prototype.
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