Justification of the program motion model for space-based Earth observation systems

2020 ◽  
pp. 47-56
Author(s):  
Д.В. Виноградов
Keyword(s):  
Analytical Model ◽  
Earth Observation ◽  
Autonomous Control ◽  
Motion Model ◽  
Real Motion ◽  
Program Motion ◽  
The Real ◽  
Observation Systems

статье рассматривается вопрос об автономном управлении космическими аппаратами (КА) в составе космических систем дистанционного зондирования Земли. Описана аналитическая модель программного движения КА, близкая к реальному движению, которая позволяет разработать и реализовать технологию автономного решения задач управления положением КА в заданной окрестности программного движения. Описаны свойства класса динамически устойчивых орбит. The article deals with the issue of autonomous control of spaceсraft (SC) as part of space Earth observation systems. An analytical model of the SC program motion close to the real motion is described, which allows developing and implementing a technology for autonomous control of the SC position in a given neighborhood of the program motion. Properties of a class of dynamically stable orbits are described.

Investigation of the tyre characteristics under non-steady-state conditions on the basis of road tests

2016 ◽  
Vol 231 (1) ◽  
pp. 3-15 ◽  
Author(s):  
Hubert Sar ◽  
Andrzej Reński ◽  
Janusz Pokorski
Keyword(s):  
Steady State ◽  
Computer Simulations ◽  
Dynamic Characteristics ◽  
Slip Angle ◽  
Real Motion ◽  
Side Force ◽  
The Real ◽  
Different Types ◽  
Non Linear ◽  
The Difference

This paper presents a method of identifying the dynamic characteristics of tyres for non-steady-state conditions on the basis of road measurements on a vehicle. The side force acting on the tyre is presented as a function of not only the slip angle but also the slip angle derivative (i.e. the velocity of the change in the slip angle). Hence, the influence of the manoeuvre dynamics on the tyre characteristics and the difference between the characteristics obtained for steady-state conditions and the characteristics for non-steady-state conditions are shown. Also the results of computer simulations prepared for different types of tyre characteristics are presented in this paper. It is evident from the presented graphs that applying dynamic non-linear tyre characteristics for computer simulations instead of steady-state characteristics enables us to describe the real motion of a vehicle better.

The processing and use of data from Earth observation satellites

1984 ◽  
Vol 312 (1519) ◽  
pp. 109-114
Keyword(s):  
Remote Sensing ◽  
Earth Observation ◽  
Advanced Technology ◽  
System Designer ◽  
Satellite Systems ◽  
Use Of Data ◽  
Observation Systems ◽  
Earth Observation Satellite ◽  
Institutional Aspects ◽  
Earth Observation Satellites

Most systems reliant on advanced technology present a familiar dilemma: the system designer does not know what the customer wants, while the customer does not understand the technology well enough to know what is possible. Although Earth observation satellite systems ought ideally to be designed for all customer needs, this is impossible for several reasons. Not least of these is the difficulty of identifying at the outset all, or even most, of the possible customers. This circumstance makes the creation of Earth observation systems somewhat speculative and imposes particular constraints on the subsystems for processing and use of the data. This paper discusses the technical and institutional aspects of processing and dissemination of data from remote-sensing satellites for the benefit of the user.

scholarly journals Changing Mobility Lifestyle

2021 ◽  
Vol 10 (2) ◽  
pp. 66-79
Author(s):  
Vít Pászto ◽  
Jaroslav Burian ◽  
Karel Macků
Keyword(s):  
Data Processing ◽  
Data Protection ◽  
Personal Data ◽  
Detailed Data ◽  
Real Motion ◽  
The Real ◽  
Location Service ◽  
Motion Data ◽  
Personal Data Protection ◽  
Analytical Processing

The article is focused on a detailed micro-study describing changes in the behaviour of the authors in three months before and during the COVID-19 pandemic. The study is based on data from Google Location Service. Despite the fact it evaluates only three people and the study cannot be sufficiently representative, it is a unique example of possible data processing at such a level of accuracy. The most significant changes in the behaviour of authors before and during the COVID-19 quarantine are described and interpreted in detail. Another purpose of the article is to point out the possibilities of analytical processing of Google Location while being aware of personal data protection issues. The authors recognize that by visualizing the real motion data, one partially discloses their privacy, but one considers it very valuable to show how detailed data Google collects about the population and how such data can be used effectively.

Investigation of aquaculture dynamics at a Ramsar site, using earth observation systems in conjunction with a socio-economic assessment

2009 ◽  
Vol 14 (4) ◽  
pp. 325-336 ◽  
Author(s):  
Nidhi Nagabhatla ◽  
C. Pattnaik ◽  
S. Seneratna Sellamuttu ◽  
S. Narendra Prasad ◽  
R. Wickramasuriya ◽  
...  
Keyword(s):  
Economic Assessment ◽  
Earth Observation ◽  
Ramsar Site ◽  
Observation Systems

Planning, Design and Control of Earth Observation Systems

1977 ◽  
Vol 10 (7) ◽  
pp. 433-441
Author(s):  
Donald J. Clough ◽  
Lawrence W. Morley
Keyword(s):  
Earth Observation ◽  
Observation Systems ◽  
And Control
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