Welcome Back Sunita – Space Station 400 km away but the signals roam 35 thousand km … Astronauts from such earth – Welcome Back Sunita and How AstronAuts Communicate with Nasa Station Earth Ttecr

Welcome Back Sunita: The American Space Agency National Aeronitics and Space Administration (NASA) astronaut and Indian -origin woman Sunita Williams returned to the earth. His landing on earth took place at 3:30 am Indian time.

With this landing of Sunita Williams, a historic special mission was concluded. Now the question comes that Sunita Williams were at the International Special Station (ISS) for about 9 months, which is present at an altitude of about 400 km from the surface of the earth, then how is NASA and ISS communications?

Today, you are going to tell you about NASA’s communication system and how to contact ISS.

Many ground stations present near NASA

NASA has many ground stations, which he uses for communications. It has a special communication system tracking and data relay satellite system (TDRSS) and its main stations on Earth are in New Mexico and Guam.

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TDRs send signals to the satellite 35 thousand km away

These ground stations send signals to TDRS satellite, which is present at a height of about 35,786 km from the Earth. After that these satellites send signals to ISS. During this time, it works at the speed of signal lights, whose speed is 3 lakh kilometers per second, in such a situation it takes only 1.4 milliseconds to reach the signal from the earth to ISS and it takes 2.8 millisecraps to get signals from both sides.

ISS Communications System

TDRS satellite (relay system): These satellites receive the signal from the ground station and transport it to ISS. These satellites revolve around the Earth and maintain constant contact despite changing the status of ISS.

Communication System of ISS

ISS has many antennas and communication devices, such as band systems and contains voice, telemetry etc. inside it. KU-band system is used for high rate data, video and scientist.

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VHF Radio for Space Walk

Apart from this, VHF is radio, which is used for direct voice contact with astronauts during the spacewalk.

Return to earth

Signals from ISS are sent back to Earth only through the same TDRS satellite system. This is followed by communication of astronauts at the station in NASA.