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#40 by chota on 27 Jun, 2014 06:43
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Quote
Is the AINS mounted to the fourth stage (and, separately, will it be navigating the 4th stage), or is it a separate payload in itself? Does it have any propulsion?
This is probably similar to the testing of "mini Redundant Strapdown Inertial Navigation System" or mRESINS payload flown on PSLV-C21.
It will be tested in this flight and if performance found satisfactory will be part of the standard set of electronics in the rocket equipment bay in subsequent flights -
#41 by antriksh on 27 Jun, 2014 08:52
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Is the AINS mounted to the fourth stage (and, separately, will it be navigating the 4th stage), or is it a separate payload in itself? Does it have any propulsion?
AINS will be mounted on PSLV equipment bay on the fourth stage. Equipment bay was designed to carry NGC&C electronics and later modified to also carry micro and nano sats. AINS is based on optical sensors and will be tested for navigation performance during the flight time. AINS wont separate from the equipment bay. My guess, AINS will be part of LVM3.
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#42 by jacqmans on 27 Jun, 2014 12:27
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Press release, 27 June 2014
'Listening' for shipping traffic
Full article with video and images:
http://www.dlr.de/dlr/presse/en/desktopdefault.aspx/tabid-10172/213_read-10775/year-all/#/gallery/15374
At first, the AISat satellite will be spinning rapidly after it has been carried into orbit by a launch vehicle that will depart from the Satish Dhawan Space Centre at Sriharikota, 80 kilometres north of Chennai, India, at 06:19 CEST on 30 June 2014.
Once the German Aerospace Center (Deutsches Zentrum fuer Luft- und Raumfahrt; DLR) satellite has stabilised, its main component will be deployed and brought into service – a four-metre-long helical antenna directed towards Earth will receive Automatic
Identification System (AIS) signals from maritime traffic. DLR researchers expect their first contact with the satellite at around 11:00 CEST on 30 June. The experimental satellite will identify and track vessels from an altitude of 660 kilometres
– paying particular attention to areas with high traffic density, such as the German Bight, an area in the southeast of the North Sea. Existing commercial satellites reach their operational limits with such large numbers of vessels.
Like the beam of a flashlight
Researchers at the DLR Institute of Space Systems have found well over 1000 vessels during an overflight along the German coast from Holland to Sylt. Conventional satellites cover an area with a radius of at least 5000 to 6000 kilometres with their
non-directional antennas. "They receive everything at once – which would be equivalent to listening to 100 radio stations at the same time," says Project Manager Joerg Behrens. "The ships all broadcast their signals at once." In low traffic areas,
further away from the coastal regions, this is not a problem. In waters such as the North Sea, the Mediterranean Sea or the North American Atlantic coast and around major ports such as Beijing, Tokyo and Singapore, however, the AIS signals with their
information about position, identification, length and width, load, speed and direction can no longer be assigned to individual vessels. The DLR researcher and his team have therefore chosen an alternative technique – their helical antenna is oriented
directly towards Earth and receives AIS signals from a smaller area, with a diameter of only 750 kilometres. "It is focused like the beam of a flashlight," says Behrens.
To test the performance of the AISat satellite, the researchers will compare its data with information received from the ships by remotely operated ground stations. Currently, DLR has six terrestrial receiving stations on the German North Sea coast,
each of which has a range of between 40 and 60 kilometres. Four other stations are expected to be added. In addition, smaller, non-directional antennas are installed on AISat and will also provide comparative data. These control data from space and
Earth will be used to determine the performance of the helical antenna and receiver. "There is a lot of room for improvement in high-traffic regions – and our antenna could be a good way to do this." The unusual antenna was developed and tested in
microgravity conditions during parabolic flights in cooperation with the DLR Institute of Composite Structures and Adaptive Systems. The satellite and receiver were developed, built and tested at the DLR Institute of Space Systems.
Connection between Bremen and space
Two to three times a day, researchers in Bremen will receive data from space as the satellite passes over northern Germany. AISat will be controlled and monitored from DLR Bremen. Another receiving station is to be installed at Inuvik, in Canada, to
extend the opportunities to receive data. If the helical antenna proves to be successful, it could be an alternative for future use on commercial satellite systems.
Before all this happens, the satellite has to withstand the stress of the launch. Exactly 1113.7 seconds after launch, AISat will be injected into orbit and then begin charging its batteries. In the first overpasses, only the health of the satellite
and its receiver will be checked. Once this has been accomplished, the command will be sent to deploy the helical antenna. Initially pointing towards space, instead of Earth, the satellite will employ small electromagnets to achieve the correct orientation.
"We rely, as it were, on the magnetic field of Earth," explains Behrens. Finally, the phase that is most exciting for the researchers at DLR will follow – AISat will listen to the radio signals sent from Earth's surface, and determine which ships it can 'hear' from orbit.
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#43 by MATTBLAK on 27 Jun, 2014 12:28
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That's some nice looking hardware and rocketry they've got there!
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#44 by Artyom. on 28 Jun, 2014 07:34
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ISRO @ISROOFFICIAL
The 49 hour countdown for the launch of PSLV C23 has just begun.
ISRO @ISROOFFICIAL
Filling of fuel into the fourth stage of PSLV C23 is successfully completed
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#45 by AJA on 28 Jun, 2014 08:58
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NOTAM
Broadcast warnings - as compiled by the US National Geospatial-Intelligence Agency: http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_63
Google Earth .kmz file: http://msi.nga.mil/NGAPortal/MSISiteContent/StaticFiles/Files/NAVWARN.kmzQuote
HYDROPAC 1843/14 [5][[WWNWSFOLDER]]
INDIA-EAST COAST.
BAY OF BENGAL.
INDIAN OCEAN.
ROCKETS.
1. HAZARDOUS OPERATIONS 0345Z TO 0615Z DAILY
30 JUN THRU 02 JUL:
A. WITHIN TEN MILES OF 13-43.9N 080-14.2E.
B. IN AREA BOUND BY
12-10N 081-05E, 12-30N 081-30E,
11-50N 081-55E, 11-30N 081-30E.
C. IN AREA BOUND BY
09-05N 083-00E, 09-10N 083-35E,
08-00N 083-45E, 07-55N 083-10E.
D. IN AREA BOUND BY
00-25S 082-35E, 00-40S 083-45E,
03-10S 083-20E, 02-55S 082-10E.
E. IN AREA BOUND BY
28-35S 076-50E, 29-05S 079-10E,
35-55S 077-40E, 35-25S 075-20E.
2. CANCEL THIS MSG 020715Z JUL 14.//
Authority: NAVAREA VIII 350/14 191001Z JUN 14.
Date:
Cancel: 02071500 Jul 14
Straight-line distances between centres of exclusion zones: ~236 , 434, 1144, 3424 kms.
And #TIL that some 2008 kms south-southwest of the last exclusion zone are the French Southern and Antarctic Lands. "Look out below!"
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#46 by input~2 on 28 Jun, 2014 13:43
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Launch to be delayed by 3 mins to avoid space debris
Interesting to note that the same motivated delay occurred for Spot-6 launch!
(http://forum.nasaspaceflight.com/index.php?topic=29471.msg951643#msg951643) -
#47 by AJA on 29 Jun, 2014 02:39
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Haven't thought about this before - Is UDMH and/or N2O4 more corrosive/hazardous than MMH and/or MON-3? I ask because they've already completed the tanking of the 4th stage, and the Reaction Control Thrusters attached to the first stage, but there's no mention of 2nd stage tanking as yet.
What's the reason to tank in the order that they do? -
#48 by AJA on 29 Jun, 2014 15:39
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1. Updates
MST withdrawn and parked. Second stage oxidiser loading complete.
2. News coverage
Attached: DD News report on TV from a few minutes ago (only managed to record audio).
The PM visited the launch pad and got a briefing on the PSLV and the mission.
He also visited the VAB - where the assembly of the GSLV Mk III is taking place.
This is apparently Antrix Corporation's 3rd commercial (only?) launch (i.e. without an Indian payload), who are also forecasting a 15% (YoY?) turnover increase this time. (2012-13 Revenue: Rs 1,300 crores).
Also, the MCC supposedly has a balcony with a view of the pad. Why someone wouldn't watch the launch from there, as opposed to the indoor VIP area beats me.
EDIT: Pictures from @PMOIndia
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#49 by vyoma on 29 Jun, 2014 16:13
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Haven't thought about this before - Is UDMH and/or N2O4 more corrosive/hazardous than MMH and/or MON-3? I ask because they've already completed the tanking of the 4th stage, and the Reaction Control Thrusters attached to the first stage, but there's no mention of 2nd stage tanking as yet.
What's the reason to tank in the order that they do?
Well, I tweeted this question to ISRO official twitter page! Hoping they would answer
https://twitter.com/vyomagaami/status/483226697429291008 -
#50 by bubbagret on 29 Jun, 2014 16:20
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As to the corrosion, it depends on the alloys used as to what is susceptible to corrosion. From Wiki:
"When used as a propellant, dinitrogen tetroxide is usually referred to simply as 'Nitrogen Tetroxide' and the abbreviation 'NTO' is extensively used. Additionally, NTO is often used with the addition of a small percentage of nitric oxide, which inhibits stress-corrosion cracking of titanium alloys, and in this form, propellant-grade NTO is referred to as "Mixed Oxides of Nitrogen" or "MON". Most spacecraft now use MON instead of NTO; for example, the Space Shuttle reaction control system uses MON3 (NTO containing 3wt%NO)." -
#51 by AJA on 29 Jun, 2014 18:12
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Update: PS-2 Fuel loading completed (2310 IST).
Well, I tweeted this question to ISRO official twitter page! Hoping they would answer
https://twitter.com/vyomagaami/status/483226697429291008
Doubt it. It's one way flow on Twitter. They do reply on their Facebook page sometimes though.
I asked because I thought you'd fill from bottom up - for as much static stability as possible. Even if they didn't fill in the oxidiser (assuming the second stage oxidiser is more corrosive), they could still fill in the fuel (UDMH) - unless that too, is corrosive, or unstable etc. -
#52 by input~2 on 29 Jun, 2014 19:04
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"Live Telecast by Doordarshan and Webcast of Launch will be available on June 30, 2014 from 09:15 hrs (IST)" i.e. from 0345UTC
Webcast at: http://webcast.gov.in/live/
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#53 by sanman on 30 Jun, 2014 00:07
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Prime Minister to attend launch
This one is a day old:
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#54 by Chris Bergin on 30 Jun, 2014 00:26
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Going to need you guys to cover this due to the bad timing for GMT.
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#55 by tehwkd on 30 Jun, 2014 02:32
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Countdown normal.
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#56 by tehwkd on 30 Jun, 2014 02:48
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Weather reports saying rain at 9 IST (T-0 at 9:52 IST) and sky is currently getting cloudy.
Source: http://ibnlive.in.com/livetv/ -
#57 by antriksh on 30 Jun, 2014 03:27
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#58 by antriksh on 30 Jun, 2014 03:38
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#59 by vyoma on 30 Jun, 2014 03:41
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Live stream links:
ISRO Webcast:
http://webcast.isro.gov.in/
http://webcast.isro.gov.in/webcast-1.aspx
http://5.153.30.196/isro/webcast/300614/
Doordarshan News:
http://webcast.gov.in/live/
Doordarshan National:
PM's Channel:
