IRS-P6 Resourcesat-1

RESOURCESAT-1 is the tenth satellite of ISRO in IRS series, intended to not only continue the remote sensing data services provided by IRS-1C and IRS-1D, both of which have far outlived their designed mission lives, but also to vastly enhance the data quality. RESOURCESAT-1 is the most advanced Remote Sensing Satellite built by ISRO as of 2003.

 

Launch date	October 17, 2003
Launch site	SHAR, Sriharikota
Launch vehicle	PSLV-C5
Payloads	LISS-4, LISS-3, AWiFS-A, AWiFS-B
Orbit	Polar Sun Synchronous
Orbit height	817 km
Orbit inclination	98.7o
Orbit period	101.35 min
Number of Orbits Per day	14
Local time of equator crossing	10:30 am
Repetivity (LISS-3)	24 days
Revisit	5 days
Lift-Off mass	1360 kg
Attitude and orbit control	3-axis body stabilised using Reaction Wheels, Magnetic Torquers and Hydrazine Thrusters
Power	Solar Array generating 1250 W, Two 24 Ah Ni-Cd batteries
Mission Life	5 years

INSAT–3A

INSAT–3A, the third satellite in INSAT–3 series is a multipurpose satellite for providing telecommunications, television broadcasting, meteorological and search and rescue services. It carries twenty four transponders – twelve operating in the normal C – band frequency, six in extended C band and six in Ku–band. INSAT–3A also carries a Ku–band beacon.

For Meteorological observation, INSAT–3A carries a three channel Very High Resolution Radiometer (VHRR). In addition, INSAT–3A carries a Charge Coupled Device (CCD) camera which operates in the visible and short wave infrared bands providing a spatial resolution of 1 km.

A Data Relay Transponder (DRT) operating in UHF band is incorporated for real time hydro meteorological data collection from unattended located on land and river basins. The data is then relayed in extended C–band to a central location.

INSAT–3A also carries another transponder for Satellite Aided Search and rescue (SA&R) as part of India’s contribution to the international Satellite Aided Search Programme.

Mission	Telecommunication, broadcasting and Meteorology
Spacecraft Mass	2,950 Kg (Mass at Lift–off) 1,348 Kg (Dry mass)
Onboard power	3,100 W
Stabilization	3 – axis body stabilised in orbit using momentum and reaction wheels, solar flaps, magnetic torquers and eight 10 N and eight 22 N reaction control thrusters
Propulsion	440 N Liquid Apogee Motor with MON-3 (Mixed Oxides of Nitrogen) and MMH (Mono Methyl Hydrazine) for orbit raising
Payload	Communication payload - 12 C – band transponders, - 6 upper extended C band transponders - 6 Ku band transponders - 1 Satellite Aided Search & Rescue transponders Meteorological payload - Very High Resolution Radiometer (VHRR) with 2 km resolution in visible band and 8 km resolution in infrared and water vapour band - Charged Coupled Device (CCD) camera operating in visible, near infrared and shortwave infrared band with 1 km resolution. - Data Relay Transponders (DRT)
Launch date	April 10, 2003
Launch site	French Guyana
Launch vehicle	Ariane5-V160
Orbit	Geostationary (93.5o E longitude)
Mission life	12 Years