IRNSS-1I is a navigation satellite of India's NavIC system, sending positioning signals in the L5 and S bands. PSLV-C41 launched it from Sriharikota in April 2018.
IRNSS-1I is the eighth satellite to join the IRNSS space segment, now called NavIC. Its navigation payload transmits signals in the L5 and S bands that receivers use to work out position, velocity and time. Rubidium atomic clocks are part of this payload.
A ranging payload with a C-band transponder lets ground stations measure the satellite's distance precisely. It also carries corner-cube reflectors for laser ranging.
Like the seven IRNSS satellites before it, IRNSS-1I weighed 1425 kg at lift-off and shares their design.
PSLV-C41, the 43rd flight of PSLV, lifted off from the First Launch Pad at Sriharikota at 4:04 IST on 12 April 2018. It was the 20th flight of PSLV in the 'XL' form.
The public satellite catalogue carries IRNSS-1I with an operational flag in a geosynchronous orbit of about 35,699 × 35,876 km.