The rocket, PSLV-C45, in its 47th mission, injected the 436 kg EMISAT, aimed at electromagnetic measurement, alongwith 28 co-passenger satellites belonging to Lithuania, Spain, Switzerland and the US, into their designated orbits.

What is EMISAT?
The Indian Space Research Organisation (ISRO) launched the country’s first electronic surveillance satellite, EMISAT. EMISAT has been launched at height of 748 kms.

Space-based electronic intelligence or ELINT from the 436-kg spacecraft (EMISAT) will add teeth to situational awareness of the Armed Forces as it will provide location and information of hostile radars placed at the borders; this will be another dimension to current land or aircraft-based ELINT.

28 customer satellites
28 customer satellites were launched in 504 kms orbit. The other 28 international satellites — 253U type, two 6U type and one 2U type nano satellites — are from Lithuania (two), Spain (1), Switzerland (1) and the United States (24). All these satellites were launched under commercial arrangements.

Firsts in this mission
In this launch there are many achievements which have been possible for the first time.
1. First time a PSLV was flown in a new configuration of four strap on motors.
2. First time a PSLV is carrying out three orbital missions in a single flight.
3. First time PS4 (fourth stage) is powered for carrying out experimental platforms.

Details of launch
ISRO scientists placed the satellites and payloads in three different orbits. After injecting the primary satellite EMISAT at around 17 minutes from lift off in a 748 km orbit, they restarted the fourth stage twice.

During this initiative, all the other 28 customer satellites, totally weighing about 220 kgs, were released one-by-one by lowering the fourth stage to around 504 kms orbit. This process took about 160 minutes for ISRO from lift off at 9.27 am.

Again, the fourth stage was reignited and further lowered to 485 kms orbit to serve as an orbital platform for carrying out space borne experimentations.

This is the first time it has been envisaged to provide a micro-gravity environment for research organisations and academic institutes to perform experiments. The experiment payloads are automatic identification system from ISRO for Maritime satellite applications capturing messages transmitted from ships.

Automatic Packet Repeating System from AMSAT (Radio Amateur Satellite Corporation), India to assist amateur radio operators in tracking and monitoring position data. Advanced Retarding Potential Analyzer for lonospheric Studies (ARIS) from Indian Institute of Space Science and Technology (IIST) for the structural and composition studies of ionosphere.

Role of private sector in launch
Noting that the industry played a major role in the PSLV-C45 mission, nearly 95 per cent of the hardware for this mission was fabricated in the private companies. Nearly 60-70 per cent of the satellite components were also fabricated outside ISRO. In fact the payload for this particular satellite is fabricated in one of the electronic industries in Bengaluru.

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