This mission launched IRNSS-1I navigation satellite into orbit.[1] The satellite is intended to replace the failed IRNSS-1A, and complete the constellation of geosynchronous navigation satellites after IRNSS-1H failed to do so. The satellite was successfully infected into orbit 19 minutes after lift-off. ISRO Chairman K. Sivan described the mission as a success and congratulated the scientists behind it.
Payload
Like its predecessor, IRNSS-1I has two types of payloads, navigation payload and the ranging payload. The navigation payload transmits navigation service signals to the users. This payload is operating in L5 band and S band. A highly accurate Rubidium atomic clock is part of the navigation payload of the satellite.[2] Failure of these Rubidium atomic clocks was the reason for IRNSS-1A to be deemed unfit. The satellite contains corner cube retroreflectors used for LASER ranging.
Launch
Launched on April 12, 2018,
Ignition of the core stage, followed by the ignition of the six strap-ones.
After 70 seconds, at an altitude of 23.6km, the boosters separated.
Core stage separated after 110 seconds, at an altitude of 55km.
At 203 seconds, at 113&km, second stage ignited.
After the payload fairing, the second stage separated at an altitude of 131.5&km.
At 264 seconds, 132km, third stage ignited, followed by a third stage separation at 599 seconds and 183km height.
At 609 seconds, 185km, fourth stage is ignited.
At 454.4km, fourth stage is cut off. Soon after, the satellite is injected into a sub geosynchronous transfer orbit, which is 284km at perigee and 20650km at apogee.[3] The maneuver took place above the island of New Guinea.
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