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MATLAB : Fourier transform

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By Nuno Nogueira, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=3912826 MATLAB has been  crucial programming language across worldwide that let us express matrix and array mathematics directly. In signal processing and communication it plays vital role in analysing and exploring time series data in time domain or frequency domain. For analysing non periodic signals in frequency domain we use Fourier transform instead of Fourier series ,which is used to express periodic signals in terms of infinite sum of sinusoidal terms .   Fourier transform can exist for :      1. Energy signals      2. Power signals       3. Impulse signals  That means absolutely integrable signals can have their Fourier transform only.  Formula for Fourier transform;   Then its come to use Fourier transform in MATLAB. So here is the code for Fourier transform of sinusoidal wave , for any other signal we ...
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Progressive Step of ISRO towards space

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In the continuation of our previous blog, it turns to introduce you with further missions of ISRO .....
After Rohini satellite mission next in the row was ASLV mission.
isro
              
ASLV:

ASLV
ASLV

ASLV stands for Augmented Satellite Launch Vehicle. It was all started to expand the payload capacity to 150 kg which is thrice of the previous SLV-3 so that satellites weighing more than before can be placed I to lower earth orbit. It's a five-stage program. ASLV  project develops technologies to place the payload into the geostationary orbit of Earth and also mastered many technologies like strap-on which helped in the development of PSLV.
Under this project, four developmental flight was conducted from the Sriharikota launching pad.
  • ASLV-D1 was the first developmental flight, took place in March 24,1987, was carrying satellite SROSS-1 and other scientific instruments. It was not successful.
  • ASLV-D2 was the second developmental flight which took place in July 13,1988 carrying satellite SROSS-2 was not successful.
  • ASLV-D3 was the third developmental flight which took place on May 20, 1992, carrying satellite SROSS-C was partially successful.
  • ALSV-D4 was the fourth developmental flight which took place on May 5, 1994, was carrying the SROSS-C2 satellite was successful.
After this mission ASLV was completely terminated.
In the continuation of this chronology, the next name came of PSLV project.

PSLV:
          PSLV
          PSLV

PSLV stands for the polar satellite launch vehicle. It is the third-generation launch vehicle of India and also the first satellite launch vehicle of India which is equipped with liquid stages. It helps India to launch their Indian remote sensing satellites into a sun-synchronous orbit.
  • PSLV-D1 was launched on Sep 20,1993 from Sathish Dhawan space centre, Sriharikota. IRS-1E. The satellite was not placed in the orbit so this mission was unsuccessful.
  • PSLV-D2 successfully launched the satellite IRS-P2 on Oct 15, 1994....many more

The facts about PSLV is too long. From 1994 till 2017 India has launched 48 Indian satellites and 209 foreign satellites through PSLV. These launch vehicle also used in launching two spacecraft of India that went to moon and Mars after that. Those spacecraft were Chandrayan-1  in 2008 and Mars Orbiter spacecraft in 2013.
PSLV has earned the title of "workhorse of ISRO" due to their consistently launching various satellite to their lower earth orbit like IRS series of satellites. It can also carry a load up to 1750 kg to the Sun-Synchronous Polar Orbits.

-By Jelsy Singh

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