Modeling and Control of a Recoverable Balloon System for Launch of Small Payloads to Low Earth Orbit

2006 ◽  
Author(s):  
Mike Wilson ◽  
Agamemnon Crassidis
Keyword(s):  
Low Earth Orbit ◽  
Earth Orbit ◽  
Modeling And Control ◽  
And Control ◽  
Balloon System

Mechanism, ensuing dynamics and control of a polar low-earth orbit tethered nano-satellite

2015 ◽  
Author(s):  
Raunaq Rakesh ◽  
Siddharth Mayya ◽  
Carina Pereira ◽  
Naman Saxena ◽  
Faraz Haider ◽  
...  
Keyword(s):  
Low Earth Orbit ◽  
Earth Orbit ◽  
Dynamics And Control ◽  
Polar Low ◽  
And Control

scholarly journals Design of a Self-Phased Quadrifilar Helix Antenna for Satellite Communication

2017 ◽  
Vol 7 (6) ◽  
pp. 2273-2276
Author(s):  
R. Narimani ◽  
L. Farhoudi
Keyword(s):  
Satellite Communication ◽  
Satellite Communications ◽  
Low Earth Orbit ◽  
Earth Orbit ◽  
Wide Beam ◽  
Circularly Polarized ◽  
Design And Implementation ◽  
Polarized Beam ◽  
And Control ◽  
Leo Satellite

The objective of this study is the design and implementation of a Quadrifilar Helix Antenna (QHA) for telemetry, tracking and control of a Low Earth Orbit (LEO) satellite. Because of its cardioid-shaped circularly polarized beam, QHA can satisfy requirements of satellite communications completely. In this paper, a variation of QHA referred to as “self-phased QHA” with a single feeding circuit, has been proposed to reduce implementation complexity. The designed antenna has been analyzed and the experimental results show that the radiation pattern provides good wide-beam in the desired frequency while the antenna’s bandwidth is around 200MHz when VSWR is less than 2.

APPLICATION ISSUES OF SPACE INFORMATION FACILITIES FOR SPACE OBJECTS MONITORING

2018 ◽  
pp. 85-89
Author(s):  
V. D. Shilin ◽  
V. N. Lagutkin ◽  
A. P. Lukyanov ◽  
A. M. Starostenko ◽  
M. M. Ibragimov
Keyword(s):  
Image Processing ◽  
Orbit Space ◽  
Computer Models ◽  
Low Earth Orbit ◽  
Earth Orbit ◽  
Space Systems ◽  
Space Objects ◽  
And Control

Complex of computer models for study of effectiveness of application of space information facilities was developed for solution the tasks of orbits monitoring and space objects recognition. It is shown, that space information facilities provide minimal breaks in observations and can make a significant informational contribution to the solution of the problem of reducing the required time of orbits determination of space objects, including maneuvering ones on both low and high orbits. Comparative assessments of required time for estimation of space objects orbits parameters for various orbits of space information facilities were obtained. It is also shown, that space systems allow carrying out recognition and control of space objects state more effectively, due to the possibility of their observation from short distances in the optical waveband. Methods of space objects image processing are developed and estimates of their effectiveness are presented. Proposals are given for use of small spacecrafts for monitoring low-Earth-orbit space objects when flying on cross courses.

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