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General News ISRO to launch navigation satellite on April 12
#1
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India’s space agency ISRO on Saturday said it will launch a navigation satellite from its spaceport in Sriharikota in Andhra Pradesh on April 12.

“The 43rd flight of Polar Satellite Launch Vehicle (PSLV-C41) will launch the Indian Remote Navigation Satellite System (IRNSS-1I) from the first launch pad of the Satish Dhawan Space Centre at Sriharikota on April 12 at 4.04 a.m.,” the Indian Space Research Organisation (ISRO) said in a statement on its official website.

The IRNSS-1I is the eighth satellite to join the NavIC navigation satellite constellation in Earth’s polar orbit.

The launch a fortnight after ISRO launched communication satellite GSAT-6A on March 29 on board a heavy rocket (GSLV), but lost communication link with it on March 31 when it was on course to its intended slot in the geo-stationary orbit, about 36,000km above the Earth.

The Master Control Facility (MCF) of the space agency at Hassan in Karnataka has been trying its best to restore link with the 2,000kg satellite since April 1 but not succeeded till date.

The 8th navigation satellite IRNSS-1I will be a replacement in the NavIC constellation for the 1,425kg IRNSS-1H that failed to eject out of the PSLV rocket on August 31, 2017 to its intended orbit as its heat shield failed to separate even about 20 minutes after it was launched.

The rocket’s heat shield should have separated three minutes into the launch, but failed to.

After a 19-minute wait for the heat shield to separate, ISRO scientists had declared the mission unsuccessful.

The IRNSS-1H satellite was to have been slung into orbit at 507km above the Earth in the polar orbit.

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Airtel Digital HD Recorder / Kerala Vision Digital TV
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#2
Indian rocket successfully puts into orbit IRNSS-1I navigation satellite

[Image: gsat-6a-isro-rocket-launch.jpg]

India early on Thursday put into orbit navigation satellite IRNSS-1I, a part of Indian satellite navigation system NavIC in copy-book style.

The 1,425 kg satellite was carried into space by Polar Satellite Launch Vehicle (PSLV) rocket’s ‘XL’ variant.

Simply put, NavIC (Navigation with Indian Constellation, earlier the Indian Regional Navigation Satellite System or IRNSS) is the Indian ‘GPS’.

After the successful launch, Indian Space Research Organisation Chairman K. Sivan said:”I am extremely happy to announce that the PSLV has precisely injected the navigation satellite in the targetted orbit.”

He said ISRO is moving towards to get the rocket and satellite through industry.

Sivan said over the next eight months, ISRO has planned nine launch missions including the moon mission towards the end of the year.

At 4.04 a.m., the four stage/engine PSLV-XL rocket, standing 44.4 metres tall and weighing 321 tonnes, blasted off from the first launch pad.

Just over 19 minutes into the flight, the rocket slung IRNSS-1I into the orbit from where the satellite will be taken up to its final position at geo synchronous orbit at a height of 36,000 km.

The Rs 1,420 crore Indian satellite navigation system NavIC consists of nine satellites — seven in orbit and two as substitutes. The fully operational system is expected to provide accurate position information service to users across the country and the region, extending up to an area of 1,500 km.

One of the substitutes was the IRNSS-1H as the in IRNSS-1A’s rubidium atomic clocks, important for giving accurate positional data, had failed. However, the IRNSS-1H satellite launch mission ended in a failure on August 31 last year.

The 1,425 kg IRNSS-1I was the second satellite sent up as replacement for IRNSS-1A and the ninth of the IRNSS satellite series.

Each satellite has three rubidium atomic clocks and a total of 27 clocks for the navigation satellite system (including the standby satellites) were supplied by the same vendor.

Like its other IRNSS predecessors, IRNSS-1I also carries two types of payloads for navigation and ranging.

The navigation payload, operating in L5-band and S-band, will transmit navigation service signals to the users, while the ranging payload consists of a C-band transponder, which facilitates accurate determination of the range of the satellite. IRNSS-1I also carries Corner Cube Retro Reflectors for laser ranging.

NavIC provides two types of services — standard positioning service and restricted service. The former is for all users while the latter is an encrypted service for only authorised users.

According to ISRO, NavIC is useful for fishermen to reach potential fishing areas. The fishermen can also get alert messages relating to bad weather, high waves or when they approach the international maritime boundary line. These services are provided through a software application on a smart phone.

The Indian space agency also said NavIC is useful for merchant ships in their navigation and also during search and rescue operations.

In the road transport sector, NavIC helps commuters to traverse distances and also enables transport operators to track their vehicles.

The navigation system is also helpful for railways in tracking trains and also giving an alert in the case of an unmanned level crossing. It is also used for other applications like location-based services, survey and alignment, and time synchronised services.

Starting in July 2013, the Indian space agency has launched eight navigation satellites, with the last one launched on August 31, 2017. This was a failure as the rocket’s heat shield did not separate three minutes after lift-off and the satellite remained housed inside the heat shield.

Each satellite has a life span of 10 years.

Source:
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Airtel Digital HD Recorder / Kerala Vision Digital TV
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#3
ISRO completes final orbit raising operations of navigation satellite

The Indian Space Research Organisation (ISRO) has successfully carried out the fourth and final orbit raising operations of navigation satellite, IRNSS-1I, the space agency has said.

The orbit raising operation took place at 9.05 p.m. on Sunday, the ISRO said.

The achieved perigee height (nearest point to the earth) is 35,462.9 km and apogee height (farthest point to the earth) is 35,737.8 km.

The IRNSS-1I was launched on April 12.

After a flight lasting about 19 minutes, the Polar Satellite Launch Vehicle (PSLV) achieved a Sub Geosynchronous Transfer Orbit with a perigee of 281.5 km and an apogee of 20,730 km inclined at an angle of 19.2 degree to the equator.

At that point, the IRNSS-1I got separated from the rocket.

Following that ISRO carried out four orbit raising operations on April 13 (first and second), April 14 (third operation) and April 15.

However, the ISRO did not provide any information for how many minutes the satellites’ onboard motors were fired for raising the orbit.

Source:
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