Basics of a satellite
Basic Questions on Satellites
How are the satellites? The radio communication satellite is the result of research in the field of communications, in order to obtain greater increases in operating capacity with the lowest possible cost.
Some services offered by satellite? In satellite communication systems, in the long-distance links, also have the ability to raise or broadcast signals to and from various locations instead of passing from one point to another.
What is a satellite and how it works? It is an electronic repeater located in space, receives signals generated on earth, amplifies and sent back to earth. And it works as a radio amateur "A" sends a signal that is received by the satellite. The satellite amplifies and retransmits immediately. The amateur "B" receives and answers. So begins a satellite communication.
What are the type satellite orbits most used? Practically all satellites used today for corporate communications networks are GEO. The basic applications of these satellites are broadcast point-to-multipoint and point-to-point.
Some advantages of using satelires medium earth orbit (MEO) The medium earth orbit satellites are located at an altitude of entre10075 and 20150 kilometers. Unlike GEO (Geosynchronous Earth Orbit) its position relative wing surface is not fixed. Being at a lower altitude, you need a larger number of satellites for global coverage, but the latency is reduced substantially.
Classification of satellites for its purpose or Satellite earth observation. Weather satellites. Satellite navigation. Telecommunication satellites. Military and spy satellites. Amateur radio satellites.
The main functions of a telecommunications satellite Amplifying the carrier signals for transmission received on the downlink. Just as the change in frequency of the carrier signals to avoid interference problems
Some of the architecture of a satellite The satellite consists of a payload and a platform. The payload consists of the receiving and transmitting antennas, and electronic equipment that supports transmission of information bearing signals. The platform consists of all subsystems which allow the operating payload.
A satellite is a complex system comprised of several systems pequeños.Algunos of them ... Control Points System Checkpoints direction keeps the satellites. The system uses sensors (like eyes), so the satellite antenna "sees" to where it is pointing. A satellite that makes scientific observations need a management system more accurate than a communications satellite. Command and Data Subsystem systems of data processing controls and commands are those that manage all functions of the spacecraft (the brain of the satellite). Communications Subsystem communication system having a transmitter, a receiver, and multiple antennas to relay messages between the satellite and the earth. Ground control is used to send instructions to the computer operating the satellite. This system also sends other data frames and captured by the new satellite in the soil engineers. Power Supply All satellites need power to work funcionar.El sun provides the power most satellites orbiting the earth. This system uses solar arrays to make electricity from sunlight, the batteries for energy storage, and distributed to all the satellite instruments. Mission Payload Payload is all equipment that a satellite needs to do its job. It is different for each mission. A communications satellite antenna reflectors need to send large TV or telephone signals. A satellite to take pictures of the earth needs a digital camera to take pictures of the surface of the satellite tierra.Un scientific research requires a telescope and image sensors to record views of stars and planets.
The future satellite development It is expected the development of regenerative satellites, which have incorporated sañeles processing equipment in the satellite itself and improve the carrier signals retransmitted. Intersatelitales optical links, which will reduce the propagation time between links where several satellites involved. The use of higher frequencies (30 / 20 Ghz. And 50 / 40 Ghz.) Today these frequencies cause very elevedas attenuation problems, mainly by rain.
Solar Arrays Solar arrays are large structures that are composed of thousands of tiny solar cells. Each cell generates electricity from sunlight. When these cells are connected together, they generate a lot of power that big power on the satellite and download the satellite batteries.
Thermal Blanquet The thermal blanket is part of the thermal control subsystem. The blanket is a thin material that covers the entire satellite, and performs the following functions: hot satellite keeps the cold and cool in the heat. The satellites are exposed to very cold degrees and very hot temperatures (-a + 120 180). Without the thermal blanket, the delicate electronic item would be damaged.
Batery The battery is part of the power subsystem. Saves the electrical energy produced by the solar arrays so that it can be used for all electronic equipment on the satellite.
Bus Structures This important piece of a satellite is the frame that holds it together. The bus structure is usually very recistente material that is lightweight and strong enough to hold the rest of the pieces, but not so heavy that the satellite can not be lifted into orbit.
Star trackers The persecutors of the star are part of the control subsystem. They are small telescopes that need space and read the position of the stars. The satellites use the position of the stars to navigate, just as we do on earth.
Reaction wheels The reaction wheels are also part of the control subsystem. They rotate the satellite in different directions. His strength makes the satellite move and point in the directions specific especficas.
I / O Processor The input-output processor subsystem is part of the data and commands. controlling the flow of data in and flight computer.
Omni Antennas The omni antenna is part of the communications subsystem. They are used to transmit control messages between satellite and earth.
Flight computer The flight computer subsystem is part of the data and commands. This is the satellite brain that controls all activity in the satellites.
Transmitter / receiver The transmitter / receiver subsystem is part comunicaciones.Cuando satellites need to send a picture to the land, the transmitter changes the image data into a signal that can be issued to land. When engineers sent a command to the satellite, the satellite receiver picks up the signal and sends a message changes in the satellite's computer can understand.
The ground segment It consists of all earth stations, these are often connected to the end user via a terrestrial network, or in the case of small stations, directly connected to the end user's computer.