Study the Fluctuating Dynamics of Radiation Patterns generated by Communication Satellite Antennas Parabolic Reflector as a Conformed Case (original) (raw)
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A mathematical model for improving the mechanism of satellite antenna
2015 International Conference on Space Science and Communication (IconSpace), 2015
The functionality of any type of antenna could be traced to the Maxwell's electromagnetic field equations. However, salient operational problems of antennas are traced back to the Maxwell's. The inclusion of the effects of particulate to either transmission or reception unit of antenna is paramount. The Schrodinger was used to model a now reformed Maxwell's equation which explains in details the electrostatic and induced magnetic field of either transmitting or receiving antenna. This theory applies to only to stationary satellite antennas.
Transport and Telecommunication Journal
The work deals with the design, modelling and research of an antenna system for transmitting and receiving information in satellite systems. It was revealed that this antenna array with a transmitter of 85 dBWt is guaranteed to solve the target problem of providing mobile satellite communications with both one global beam and a plurality of beams with a width of 0,7 × 0,7°. It should be added that the advantage of forming multiple beams compared to a global beam with a single phased antenna array is: higher data rate, relatively low requirements for antenna systems of ground stations, greater noise immunity of the radio link, the ability to dynamically control the signal power in each beam.
Antennas for Space Applications: A Review
IntechOpen eBooks, 2020
It is well known that antennas are inevitable for wireless communication systems. After the launch of Sputnik-1 which was the first artificial satellite developed by USSR (Union of Soviet Socialist Republics), telecommunication technologies started to develop for space excessively. However, significance of the antennas as first or final RF-front end element has not been altered for the space communication systems. In this chapter, after introducing telecommunication and antenna technologies for space, which space environmental conditions are to be faced by these antennas are summarized. Then, frequency allocation that is a crucial design factor for antennas is explained and tabulated. And finally at the last part, different types of antennas used in different space missions are presented with their functional parameters and tasks.
Perturbative effects of antenna radiation reaction on artificial satellite orbit
Aerospace Science and Technology, 2012
The actual orbital trajectory of an artificial satellite is very sensitive to a large number of disturbances, whose effects add to the main force exerted by Earth's gravitational field. Perturbations caused by solar radiation pressure, albedo, the Moon and the Sun gravitational fields are well understood and have been taken into account already. By contrast, to the best of our knowledge, the radiation reaction force on the satellite caused by antenna radiation was not considered so far, which is done in the present contribution. We study the acceleration on the satellite caused by radiation reaction originated from the antenna radiation, taking into account the antenna radiation pattern. It is shown that for typical communication satellites the perturbation on the satellite orbit due to the power radiated by the transmitting antenna amounts to a non-negligible effect on the order of 10 −9 m/s 2 .
Measurements of antenna performance ratio using satellite emissions
Journal of Physics: Conference Series
Performance of the antenna is parameter in the reception of remote sensing satellite data. Gain to noise ratio becomes one of the variable conditions for satellite data transmitted from transmitters and satellite antennas to be received after power loss in a free space. Remote sensing data reception quality depends on the value of the gain to noise antenna. The Quality gain to noise determines the value of bit energy per noise received in the demodulator. The value of energy bit per noise received by a demodulator corresponds with the required energy bit per noise from modulation systems. Currently gain to noise measurements use the sun, moon, and stars by comparing the power of the transmitter with the received power in the antenna. This measurement takes a time when the antenna is full schedule. The approach in this study uses satellite power distance slant range and carrier to noise received at the receiver. Knowing the elevation angle of the satellite when it passes we can get the slant range. By using satellite transmit power parameters, free space loss, operating bandwidth, and carrier to noise in the receiver, we will find expected gain to noise antenna.The result, measurements using power satellite is success to calculate the gain to noise antenna. This newmethod makes it easier to monitor antenna availability continuously.
Antenna radiation effects on the orbits of GPS and INTELSAT satellites
Acta Astronautica, 2013
A large number of disturbances add to the main force exerted by Earth's gravitational field and affect the actual orbital trajectory of artificial satellites. They possess antennas with specific purposes, such as telecommunication systems operating at specific ranges of frequencies and radiated power. For instance, the antennas used in the GPS and INTELSAT satellites are quadrifilar helix and parabolic reflectors respectively. The radiation emitted by the antennas produces a radiation reaction force on the satellite making its orbital elements deviate from their expected values. Using a mathematical model for the radiation reaction force caused by the antenna, derived from the electromagnetic theory and the energy-momentum conservation law, the perturbation effects on the orbits of the GPS and INTELSAT satellites were studied. The numerical integrator used to solve the satellite equations of motion is based on the Runge-Kutta method of fourth and fifth orders. The theoretical model of antenna radiation reaction takes into account the satellite mass, antenna radiated power and maximum gain of the antenna.
Comparative Study of Radiation Pattern of Some Different Type Antennas
2014
In this we report radiation pattern of some important antennas as well as area covered by them. The paper starts by giving the reader a refresher on antenna pattern parameters and then shows typical patterns for the most common antennas used in EMC. As the improvements on the communication and navigation systems of aircrafts go on, new edge cutting technologies are developed and new approaches to the system components are required. The antenna represents the interface between the transmitted and/or received microwaves traveling on free space and the signal processing hardware and software. Optimizing the antenna characteristics can lead to great improvements to the overall system performance, like lower noise figures, suppressed multipath and interference signals and higher signal levels, i.e. better accuracy, better aerodynamics, lighter weight, etc. The peak value of radiation for A1 dipole L/2 antenna is typically 63.2 dB μA at 95. For A6 telescopic antenna the value of high radi...
In the world of modern wireless communication, engineer who wants to specialize in the communication field needs to have a basic understanding of the roles of electromagnetic radiation, antennas, and related propagation phenomena. These papers discuss on the performance, characteristic, testing, measurement and application of antennas in modern wireless communication systems. Antenna is an important part of any wireless communication system as it converts the electronic signals (propagating in the RF Transreceiver) into Electromagnetic Waves (Propagating in the free space) efficiently with minimum loss. We use antennas when nothing else is possible, as in communication with a missile or over rugged mountain terrain where cables are expensive and take a long time to install. The performance characteristics of the parent system are heavily influenced by the selection, position and design of the antenna suite. To understand the concept of antenna one should know the behaviour of Electromagnetic waves in free space. So I am briefly covering the basics of Electromagnetic waves and its propagation modes in free space. Apart from that I am also covering Antenna classifications (based on Frequency, aperture, polarization and radiation pattern), its performance parameters (Gain, Directivity, Beam area and beam efficiency, radiation pattern, VSWR/Return loss, polarization, Efficiency), measurement techniques (Outdoor and Indoor Testing) and its defence applications (Naval antennas, Airborne Antennas and Earth Station Antennas). Finally I discuss about Pyramidal horn antennas, Monopole antennas.
Advanced Communication Technology Satellite (ACTS) multibeam antenna analysis and experiment
IEEE Antennas and Propagation Society International Symposium 1992 Digest, 1992
One of the most important aspects of a satellite communication system design is the accurate estimation of antenna performance degradation (Pointing error, end coverage gain, peak gain degradation, etc. are of main concern). The thermal or dynamic distortions of a reflector antenna structural system can affect the far-field antenna power distribution in at least four ways. I. The antenna gain is reduce, 2. The main lobe of the antenna can be mispointed thus shifting the destination of the delivered power away from the desired locations 3.The main lobe of the antenna pattern can be broadened thus spreading the RF power over a larger area than desired 4. The antenna pattern sidelobes can increase thus increasing the chances of interference among adjacent beams of a multiple beam antenna system or with antenna beams of other satellites. The in-house developed NASA Lewis Research Center thermal/structural/RF analysis program was designed to accurate simulate the ACTS in-orbit thermal environment and predict the RF antenna performance. The program combines well establish computer programs (TRASYS,SINDA and NASTRAN) with a dual reflector-physical optics RF analysis program. The ACTS multibeam antenna configuration is analyzed and several thermal cases are presented and compared with measurements (pre-flight).