Abstract The use of CubeSats promises several advantages within a low economical budget margin for different missions. Nowadays, data transfer through optical channels (lasercom) is considered potential technology satellite wireless communications, providing in terms rate with lower energy consumption. However, main drawback the location Optical Ground Station (OGS). Therefore, an artificial vi...

We investigate the role of ampli ed spontaneous emission (ASE) produced by an optical booster ampli er at the transmitter of free-space optical communication links. In a communication terminal with a single telescope for both transmission and reception, this ASE power has to be taken into account in connection with transmit-to-receive channel isolation, especially since it partly occupies the s...

In the trilateration of wireless sensor networks, to overcome the affection of localization error caused by the selection of beacon nodes, a selective strategy of beacon nodes based on the angle information is proposed in this paper. By the comparative analysis of angle, we can determine the topology shape of the selected beacon nodes and the position relationship with unknown node, so that unk...

Motivated by how humans perceive geometry and color to recognize objects, we propose a boundary embedded attentional convolution (BEACon) network for point cloud instance segmentation. At the core of BEACon, introduce weight in layer adjust neighboring features, with being adapted relationship between changes. As result, BEACon makes use both information, takes as an important feature, thus lea...

At present, the magnetic signals generated by common artificial beacons change periodically with sinusoidal law, and there is a multi-value problem in measuring target orientation using phase information of signals. According to characteristics Halbach array, kind beacon based on array studied. This has signal aggregation, which can avoid facilitate extraction information. Firstly, model establ...

In this paper, we propose a range-free localization scheme for wireless sensor networks (WSNs) using four beacon nodes (BNs) equipped with a directional antenna with special transmission capabilities for sending wireless beacon signals throughout the sensor network. Each beacon node rotates with a constant angular speed and broadcasts its angular bearings. A sensor node can determine its locati...

This paper presents Beacon, a technique that exploits the advantages of IP multicast to provide a low overhead system for network topology monitoring. Beacon is a self-organizing system which builds a self similar network topology that enables the system to converge very quickly even at a high degree of scalability. Another property of the Beacon system is that it does not require any interdoma...

In systems that achieve laser beam propagation through atmospheric turbulence by phase compensation with adaptive optics, the performance depends on the beacon’s spatial distribution. A formulation is obtained to calculate the anisoplanatic Strehl ratio of a phase compensated, focused beam for any beacon distribution and turbulence profile. Analytic results are obtained for several beacon geome...

This paper studies the problem of determining the position of beacon nodes in Local Positioning Systems (LPSs), for which there are no inter-beacon distance measurements available and neither the mobile node nor any of the stationary nodes have positioning or odometry information. The common solution is implemented using a mobile node capable of measuring its distance to the stationary beacon n...