Reconnaissance Satellites
A reconnaissance satellite or intelligence satellite (commonly, although unofficially, referred to as a spy satellite) is an Earth observation satellite or communications satellite deployed for military or intelligence applications.
These satellites are able to see objects on the ground and are accordingly used for military purposes. As such their performance and operation are kept secret and not publicized. DRONES are part of the reconnaissance system.
Weather Satellites
As the name implies these satellites are used to monitor the weather. They have helped considerably in the forecasting of the weather and have helped provide a much better understanding not only of the underlying phenomena but also in enabling predictions to be made.
Satellites_ISRO_has_launched_many_small_satellites_mainly_for_experimental_purposes'>India’s Kalpana-1 and INSAT-3A are part of this.
Experimental Satellites
ISRO has launched many small satellites mainly for experimental purposes. This experiment includes Remote Sensing, Atmospheric Studies, Payload Development, Orbit Controls, recovery technology, etc.
Satellite
|
Launch Date
|
Launch Vehicle
|
Application
|
INS-1C
|
Jan 12, 2018
|
PSLV-C40/Cartosat-2 Series Satellite Mission
|
Experimental
|
YOUTHSAT
|
Apr 20, 2011
|
PSLV-C16/RESOURCESAT-2
|
Student Satellite
|
APPLE
|
Jun 19, 1981
|
Ariane-1(V-3)
|
Communication, Experimental
|
Rohini Technology Payload (RTP)
|
Aug 10, 1979
|
SLV-3E1
|
|
Aryabhata
|
Apr 19, 1975
|
C-1 Intercosmos
|
Experimental
|
Microsat
The term “microsatellite” or “microsat” is usually applied to the name of an artificial satellite with a wet mass between 10 and 100 kg.
However, this is not an official convention and sometimes those terms can refer to satellites larger than that, or smaller.
PSLV-C40 carries a Microsatellite (Microsat) built by ISRO as a co-passenger payload. Microsat is a small satellite in the 100 kg class that derives its heritage from the IMS-1 bus in the recent launch of the Cartosat-2 series.
Nanosatellites
The term “nanosatellite” or “nanosat” is applied to an artificial satellite with a wet mass between 1 and 11 kg.
PSLV-C37 carried two ISRO Nano Satellites – INS-1A and INS-1B as co-passenger satellites, which was launched on Feb 15, 2017. INS-1C was launched by PSLV-C40 on Jan 12, 2018, as a co-passenger satellite.
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