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| {{Short description|Indian radar imaging satellite}}
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| {{Use British English|date=May 2021}}
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| {{Use dmy dates|date=May 2021}}
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| {{Infobox spaceflight
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| | name = RISAT-1A
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| | names_list = Radar Imaging Satellite-1A<br/>Earth Observation Satellite-4
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| | image =
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| | image_caption =
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| | image_size = 300px
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| | mission_type = [[Imaging radar]]
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| | operator = [[Indian Space Research Organisation|ISRO]]
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| | COSPAR_ID =
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| | SATCAT =
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| | website = {{url|https://www.isro.gov.in}}
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| | mission_duration = 5 years (planned)
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| | spacecraft = RISAT-1A
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| | spacecraft_type =
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| | spacecraft_bus =
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| | manufacturer = [[Indian Space Research Organisation]]
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| | launch_mass = {{cvt|1858|kg}}
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| | dry_mass =
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| | dimensions =
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| | power = 1850 [[watt]]s
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| | launch_date = NET 6 January 2022(Expected)
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| | launch_rocket = [[Polar Satellite Launch Vehicle]], [[PSLV-C52]]
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| | launch_site = [[Satish Dhawan Space Centre]], [[Satish Dhawan Space Centre|First Launch Pad (FLP)]]
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| | launch_contractor = [[Indian Space Research Organisation]]
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| | entered_service =
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| | disposal_type =
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| | deactivated =
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| | last_contact =
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| | orbit_reference = [[Geocentric orbit]]<ref name=UIM2016/>
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| | orbit_regime = [[Sun-synchronous orbit]]
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| | orbit_periapsis = {{cvt|536|km}}
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| | orbit_apoapsis = {{cvt|536|km}}
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| | orbit_inclination = 97.84°
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| | orbit_period = 96.50 minutes
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| | apsis = gee
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| | instruments = [[Synthetic-aperture radar|Synthetic Aperture Radar]] ([[X band|X-band]]) (SAR-X)
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| | programme = [[Earth observation satellite|Earth observation satellites series]]
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| | previous_mission = [[EOS-01|RISAT-2BR2 (EOS-01)]]
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| | next_mission =
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| '''Radar Imaging Satellite-1A''', or '''RISAT-1A''', is a planned [[remote sensing]] satellite as a follow on to [[RISAT-1]] and with similar configuration. The satellite is being developed by [[Indian Space Research Organisation]] (ISRO) and it will be 6th in series of [[RISAT]] satellites. It will be a land based mission with primary application in terrain mapping and analysis of land, ocean and water surface for soil moisture.<ref name="ceos_1">{{cite web|url=http://ceos-sysdb.com/CEOS/db/db_instrument_low_level.php?id=790|title=CEOS Instrument: Synthetic Aperature Radiometer (RISAT)|access-date=February 9, 2016}}</ref>
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| == Satellite description ==
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| Synthetic aperture radar can be used for [[Earth observation satellite|Earth observation]] irrespective of the light and weather conditions of the area being imaged.<ref name="hindu-risat1radar">{{cite news |url=http://www.thehindu.com/sci-tech/technology/article3350204.ece|title=RISAT-1's radar can see through clouds and work in darkness|newspaper=The Hindu|date=25 April 2012|location=Chennai, India|first=N. Gopal|last=Raj}}</ref> The satellite will carry a [[C band (IEEE)|C-band]] [[synthetic-aperture radar]] (SAR) and will have a liftoff mass of {{cvt|1858|kg}}.<ref name=UIM2016>{{cite web|last=Reddy|first=O.V. Raghav|date=3 February 2016|title=Future Earth Observation Missions of ISRO, NRSC User Interaction Meet 2016|url=http://nrsc.gov.in/sites/all/pdf/modnrscUIM%20_Raghava%20Reddy_1.pdf|url-status=dead|archive-url=https://web.archive.org/web/20170203144958/http://nrsc.gov.in/sites/all/pdf/modnrscUIM%20_Raghava%20Reddy_1.pdf|archive-date=3 February 2017}}</ref>
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| '''Payload metrics are defined by the following parameters and areas of study:'''
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| {| class="wikitable" style="margin: 1em auto 1em auto; text-align:left;"
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| ! Category
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| ! Parameters
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| |-
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| | rowspan="4"| Land
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| | Albedo and reflectance
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| |-
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| | Soil moisture
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| |-
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| | Vegetation
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| |-
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| | Multi-purpose imagery
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| |-
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| | Ocean
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| | Ocean topography/currents
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| |-
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| | rowspan="3"| Snow & Ice
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| | Ice sheet topography
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| |-
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| | Snow cover, edge and depth
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| |-
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| | Sea ice cover, edge and thickness
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| |}
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| == Launch ==
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| RISAT-1A will be launched on the [[Polar Satellite Launch Vehicle]] (PSLV-C52). RISAT-1A is planned to be launched NET 6 January 2022.<ref>{{cite web|title=SDSC-SHAR Website |url=https://www.shar.gov.in/sdscshar/index.jsp|archive-url=https://web.archive.org/web/20210716091221/https://www.shar.gov.in/sdscshar/index.jsp|archive-date=16 July 2021|access-date=2021-07-16 |website=shar.gov.in}}</ref>
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| == See also ==
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| {{Portal|Spaceflight}}
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| * [[RISAT]]
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| * [[PSLV]]
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| == References ==
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| {{Reflist|30em}}
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| {{RISAT satellites}}
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| {{Indian spacecraft}}
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| {{Rest of the World Reconnaissance Satellites}}
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| [[Category:Earth observation satellites of India]]
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| [[Category:Space synthetic aperture radar]]
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| [[Category:2021 in spaceflight]]
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| [[Category:2021 in India]]
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| [[Category:Proposed satellites]]
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| {{India-spacecraft-stub}}
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