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Satellite Essay

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Introduction

reception station

At the beginning, the operation of building a reception station required considerable means, and only specialized institutions had access to these techniques. Nowadays, because of the recent development of micro-computers and signal processing, it is now possible for even a small institution to have its own station able to receive net images from certain meteorological satellites such as NOAA and METEOSAT satellites with affordable costs [1]
The techniques of weather satellites images reception has quickly evolved in the last decade.

Satellite Image Acquisition is one of the most explored domains in satellite communications since the start of the space age. Satellite images provide us with a wealth of …show more content…

A major drawback of using GEO satellites is that the systems require the use of industry grade parabolic dishes along with complex RF circuitry. [1]
The NOAA satellites belong to the category of the Polar Orbiting Satellites[1]
From the unique vantage point of space , those NOAA satellites bring us information about cloud formations and movements, precipitation amounts, temperatures, ocean currents, sea surface temperatures, air and water pollutants, drought and floods, severe weather conditions, vegetation, insect infestations, ozone content of the atmosphere, volcano eruptions, and other factors that affect our daily lives.

APT
Much of this information is transmitted from these satellites via direct readout to ground stations where it can be displayed and analyzed. These Direct Readout Services were pioneered more than 45 years ago by the first weather satellites and have been expanded and operated in the United States by the National Oceanic and Atmospheric Administration (NOAA).
Most weather satellites offer two kinds of picture services, a digital transmission format with high resolution data named HRPT, and an analogical transmission format of lower resolution APT.

SDR

This APT transmission format needs limited technical resources for reception and decoding.
For that a Software-defined radio SDR receivers matching with good antenna and an efficient software systems are required
An SDR is a radio

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