Relative Navigation and Orbit Control Strategy on Shift between Far and Near Field of Orbital Rendezvous

2020 ◽  
Author(s):  
Xiaolong Hao ◽  
Yun Chen ◽  
Shanshan Liu ◽  
Zhaolong Wang ◽  
Yue Sun ◽  
...  
Keyword(s):  
Control Strategy ◽  
Near Field ◽  
Relative Navigation ◽  
Orbital Rendezvous ◽  
Orbit Control

scholarly journals A Novel Relative Navigation Control Strategy Based on Relation Space Method for Autonomous Underground Articulated Vehicles

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Fengqian Dou ◽  
Yu Meng ◽  
Li Liu ◽  
Qing Gu
Keyword(s):  
Neural Network ◽  
Control Strategy ◽  
Speed Control ◽  
Relative Navigation ◽  
Competitive Neural Network ◽  
Articulated Vehicles ◽  
Navigation Control ◽  
Control Modules ◽  
Optimal Driving ◽  
Space Method

This paper proposes a novel relative navigation control strategy based on the relation space method (RSM) for articulated underground trackless vehicles. In the RSM, a self-organizing, competitive neural network is used to identify the space around the vehicle, and the spatial geometric relationships of the identified space are used to determine the vehicle’s optimal driving direction. For driving control, the trajectories of the articulated vehicles are analyzed, and data-based steering and speed control modules are developed to reduce modeling complexity. Simulation shows that the proposed RSM can choose the correct directions for articulated vehicles in different tunnels. The effectiveness and feasibility of the resulting novel relative navigation control strategy are validated through experiments.

Autonomous Orbit Control Strategy for Accurate Large Delta-V Manoeuvres in Planck Spinning S/C

2004 ◽  
Vol 37 (6) ◽  
pp. 315-320
Author(s):  
Demetrio Zorita ◽  
Alfredo Agenjo ◽  
Carolina Cazorla ◽  
Salvador Llorente ◽  
Juan Manuel Del Cura ◽  
...  
Keyword(s):  
Control Strategy ◽  
Orbit Control

Near-field scanning optical microscopy

1986 ◽  
Vol 44 ◽  
pp. 642-643
Author(s):  
E. Betzig ◽  
A. Harootunian ◽  
M. Isaacson ◽  
A. Lewis
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Visible Radiation ◽  
Field Methods ◽  
Optical Elements ◽  
Optical Region ◽  
Order Of Magnitude ◽  
Nondestructive Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

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