Thursday,19th-October-2017,12:45:PM

Atomic clocks on indigenous navigation satellite develop snag

Monday, 30 January 2017 15:01

ISRO chairman says fleet is fine, trying to revive failed clocks
NavIC, the indigenously built satellite- based positioning system, has developed a technical snag in the atomic clocks on its first satellite.
In the NavIC, a constellation of seven satellites, one of the three crucial rubidium timekeepers on IRNSS-1A spacecraft failed six months ago. The other two followed subsequently.
A. S. Kiran Kumar, Chairman of the Indian Space Research Organisation, confirmed the glitch in the clocks but clarified that the satellite was otherwise all right, and the rest of the satellites were performing its core function of providing accurate position, navigation and time. However, without its clocks, the IRNSS-1A “will give a coarse value. It will not be used for computation. Messages from it will still be used.”
ISRO, he said, was trying to revive the clocks on 1A and readying one of the two back-up navigation satellites to replace it in space in the second half of this year.
“There are some anomalies in the atomic clock system on board. We are trying to restart it. Right now we are working out a mechanism for operating it,” he told The Hindu.
“The problem is only with the clock system of one spacecraft. The signals are all coming, we are getting the messages, everything else is working and being used, except the stability portion which is linked to the clock,” he said. A minimum of four working satellites was sufficient to realise the full use of the navigation system”.
NavIC has 21 atomic clocks on seven spacecraft. “How would the other clocks fare? Would ISRO reconsider the supplier of its atomic clocks? Such questions are not easy to answer. Generally any [space] hardware is an issue. We have to find ways of going around it,” he said.
The troubled IRNSS-1A spacecraft was put in space in July 2013 and has an expected life span of 10 years. The seventh navigation satellite, IRNSS-1G, was launched in April 2016.
The satellites of the ₹1,420-crore NavIC, short for Navigation with Indian Constellation, and also known as the Indian Regional Navigation Satellite System, give precise information on position, navigation and time (PNT) of objects or persons to users on ground, sea and air.

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ISRO chairman says fleet is fine, trying to revive failed clocks


NavIC, the indigenously built satellite- based positioning system, has developed a technical snag in the atomic clocks on its first satellite.


In the NavIC, a constellation of seven satellites, one of the three crucial rubidium timekeepers on IRNSS-1A spacecraft failed six months ago. The other two followed subsequently.


A. S. Kiran Kumar, Chairman of the Indian Space Research Organisation, confirmed the glitch in the clocks but clarified that the satellite was otherwise all right, and the rest of the satellites were performing its core function of providing accurate position, navigation and time. However, without its clocks, the IRNSS-1A “will give a coarse value. It will not be used for computation. Messages from it will still be used.”


ISRO, he said, was trying to revive the clocks on 1A and readying one of the two back-up navigation satellites to replace it in space in the second half of this year.


“There are some anomalies in the atomic clock system on board. We are trying to restart it. Right now we are working out a mechanism for operating it,” he told The Hindu.


“The problem is only with the clock system of one spacecraft. The signals are all coming, we are getting the messages, everything else is working and being used, except the stability portion which is linked to the clock,” he said. A minimum of four working satellites was sufficient to realise the full use of the navigation system”.


NavIC has 21 atomic clocks on seven spacecraft. “How would the other clocks fare? Would ISRO reconsider the supplier of its atomic clocks? Such questions are not easy to answer. Generally any [space] hardware is an issue. We have to find ways of going around it,” he said.


The troubled IRNSS-1A spacecraft was put in space in July 2013 and has an expected life span of 10 years. The seventh navigation satellite, IRNSS-1G, was launched in April 2016.


The satellites of the ₹1,420-crore NavIC, short for Navigation with Indian Constellation, and also known as the Indian Regional Navigation Satellite System, give precise information on position, navigation and time (PNT) of objects or persons to users on ground, sea and air.ISRO chairman says fleet is fine, trying to revive failed clocks

 

Sugar output may drop by over 7 per cent in 2016-17 : ISMA

Wednesday, 28 December 2016 11:12

India’s sugar production could decline by over 7 per cent to 23.26 million tonnes next marketing year starting October on a likely drop in sugarcane output due to poor rains in Maharasthra and Karnataka.

The sugar output is estimated to fall for the second straight year in 2016-17 marketing year (October-September) because of drought in major growing states.

Sugar production in India, the world’s second largest sugar producer after Brazil, is estimated to have fallen to 25.1 million tonnes in the current 2015-16 marketing year ending September from 28.3 million tonnes in the previous year.

Releasing the preliminary estimate, Indian Sugar Mills Association (ISMA) said sugar output was pegged at 23.26 million tonnes in 2016-17. “This is about 1.8-1.9 million tonnes less than the current 2015-16 production of around 25.1 million tonnes.”

Drought

This is in line with the government’s estimate of 23-23.5 million tonnes for the next year. ISMA attributed the likely fall in sugar output to 5.5 per cent decline in sugarcane acreage to 4.99 million hectare in 2016-17 as against 5.28 million hectare in the previous year.

This would result in lower cane output.

According to ISMA data, sugar production in Maharasthra — the biggest producing State — is estimated to decline to around 6.15 million tonnes in 2016-17 from 8.40 million tonnes in the current year.

“Maharashtra’s cane area has declined in 2016-17, which is mainly due to drought-like situation last year, poor rainfall and lesser water availability for irrigation,” ISMA said in a statement.

The cane area in the state is down at 7,80,000 hectare as against of 1.05 million hectare in 2015-16, it added.

Sugar production in Uttar Pradesh — the second largest sugar producing state — is estimated to rise to 7.54 million tonnes in 2016-17 marketing year from 6.82 million tonnes in the current year.

 

Modi ties unity to development

Monday, 26 October 2015 11:25

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Prime Minister Narendra Modi made a pitch for unity and diversity on Sunday, saying the mantra of unity should pervade “our thought, conduct and articulation.”

Saluting Sardar Patel for geographically uniting India, Mr. Modi called for social unity in his Mann Ki Baat address to the nation. “India is a nation of diversities. There are many sects, communities, languages and castes. India is a diverse country and this diversity is our adornment,” he said. “Peace, harmony and unity are necessary for development.”

Mr. Modi’s statement follows statements made by him and President Pranab Mukherjee in the wake of an outcry over the killing of a Muslim at Dadri in Uttar Pradesh on the suspicion of storing beef and the “insensitive” statements made by some BJP leaders after the incident.

Read: Live update of PM's address on 'Mann ki Baat'

 

Dalit youth killed for keeping Ambedkar song as ringtone

Friday, 22 May 2015 12:33


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A Dalit youth was brutally assaulted and killed in the temple town of Shirdi in Maharashtra allegedly over his mobile ringtone of a song on Dr. Bhimrao Ambedkar. Four assailants have been arrested while four others are absconding.

Sagar Shejwal, a nursing student , had come home to Shirdi to attend a wedding. On May 16 around 1.30 p.m., he went to a local beer shop with two of his cousins.

According to Vivek Patil, Deputy Superintendent of Police, Sagar was assaulted by eight youths over his ringtone. Mr Patil said: “Eight youths were sitting at a table at the shop. When Sagar’s mobile rang with the Ambedkar song as its ringtone, the youths told him to switch it off. In a police statement, the cousin has described the song as Tumhi kara re kitihi halla / Mazbut Bhimacha quilla [Shout all you want / Bhim’s fortress is strong]. An altercation ensued and the assailants hit Sagar with a beer bottle and started kicking and punching him. Then they dragged him out, put him on a motorbike and took him away to a nearby forest. They crushed him under the bike. Sagar’s body was found around 6.30 p.m. in a naked state near Rui village. The cause of death was multiple fractures. The autopsy says Sagar sustained around 25 injuries. He died between 2 and 4 p.m.”

The perpetrators, a group of local youths from the dominant Maratha and OBC communities, ran their bike repeatedly over Sagar’s body mutilating it .

“I can understand that they hit him. Quarrels can happen anytime, but look at the brutality of the act. Why would they do this on such a trivial matter?” Sagar’s father Subhash Shejwal asked, unable to comprehend the horror of the assault.

CCTV footage

The initial assault was captured on the CCTV cameras at the beer shop. The 21-minute footage, in which the faces of the assailants are clearly seen, provides strong electronic evidence to the police.

The shop itself is within a stone’s throw from the Shirdi police station, raising serious questions about police inaction. “I called the police at 1.45 p.m. when the youths were beating up Sagar, but for a long time they did not come,” said Sandeep Ghorpade, manager of the beer shop. Sagar’s cousins, who managed to escape, also alerted the police, but in vain.

The family alleged that the officers on duty demanded an air-conditioned vehicle to look for Sagar. The police said a departmental inquiry would be initiated against Inspector Pramod Wagh and constable Sharad Kadam.

“Only our relatives were looking for Sagar. No police vehicle was in sight. The body was also discovered by family members,” said complainant and Sagar’s cousin Satish Gaikwad.

The police arrested Vishal Kote, Somnath and Rupesh Wadekar, who are historysheeters and Sunil Jadhav.

They have been booked under the Sections 302 (murder), 395 (punishment for dacoity), 201 (causing disappearance of evidence of offence), 109 (punishment of abetment) of the Indian Penal Code and Sections 3 (2) (v) and 3 (1) (x) of the Scheduled Castes and Scheduled Tribes (Prevention of Atrocities) Act.

 

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