IRNSS-1H – PSLV-C39 (XL) – Шрихарикота – 31.08.2017

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tnt22

http://www.andhrajyothy.com/artical?SID=457149
Цитироватьనేడు పీఎస్‌ఎల్వీ-సీ39 రిహార్సల్స్‌
28-08-2017 06:02:31
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శ్రీహరికోట సతీష్‌ థావన్‌ అంతరిక్ష కేంద్రం రెండో ప్రయోగవేదిక నుంచి పీఎస్‌ఎల్వీ-సీ39 రాకెట్‌ ద్వారా కక్ష్యలోకి ప్రవేశపెట్టేందుకు ఏర్పాట్లు పూర్తి చేసింది. షార్‌లోని వ్యాబ్‌లో రాకెట్‌తో ఉపగ్రహం అనుసంధానం ముగియడంతో ఆదివారం ఉదయం 6.30 గంటలకు రాకెట్‌ను శాస్త్రవేత్తలు రెండో ప్రయోగ వేదికపైకి చేర్చారు.
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ЦитироватьToday is the PSLV-C39 rehearsals
28-08-2017 06:02:31
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The Sriharikota Satish Dhavan Space Center has completed arrangements to launch PSLV-C39 rocket from the second launch site. Scientists have put a rocket on the second launch pad at 6.30 am Sunday morning after satellite integration with the rocket.
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ЦитироватьСегодня проходят тренировки на PSLV-C39
28-08-2017 06:02:31
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Космический центр Сатиша Давана в Шрихарикоте завершил мероприятия по вывозу ракеты PSLV-C39 на вторую стартовую площадку. Ученые доставили ракету на вторую стартовую площадку в воскресенье в 6:30 утра, после установки спутника на РН.
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tnt22

http://www.andhrajyothy.com/artical?SID=457453
Цитировать పీఎస్‌ఎల్వీ-సీ39 రిహార్సల్స్‌ విజయవంతం
29-08-2017 03:32:59

శ్రీహరికోట, ఆగస్టు 28: నావిక్‌ తొలి ఉపగ్రహంలో సాంకేతిక లోపం తలెత్తడంతో దాని స్థానంలో ఐఆర్‌ఎన్‌ఎస్‌ఎస్‌-1హెచ్‌ ఉపగ్రహాన్ని ప్రవేశపెట్టేందుకు ఇస్రో ఏర్పాటు పూర్తి చేసింది. ఈ నెల 31న శ్రీహరికోట సతీష్‌ థావన్‌ అంతరిక్ష కేంద్రం నుంచి పీఎస్‌ఎల్వీ-సీ31 ద్వారా దీన్ని కక్ష్యలో ప్రవేశపెట్టనుంది. ఈ ప్రయోగ సన్నాహాల్లో భాగంగా రెండో ప్రయోగ వేదికపై ఉన్న ఈ రాకెట్‌ ప్రయోగ రిహార్సల్స్‌ను సోమవారం శాస్త్రవేత్తలు దిగ్విజయంగా నిర్వహించారు. మంగళవారం మధ్యాహ్నం శాస్త్రవేత్తలు మిషన్‌ రెడీనెస్‌ రివ్యూ సమావేశం నిర్వహిస్తారు.
ЦитироватьPSLV-С39 успешная репетиция пуска
29-08-2017 03:32:59

Шрихарикота, 28 августа: ISRO создала спутник IRNSS-1 для замены первой спутниковой технологии NAVIC. Он будет запущен 31 августа на РН PSLV-C39 из космического центра Сатиша Давана. В понедельник учеными была проведена репетиция ракетного пуска. Во вторник днем ​​ученые проведут встречу с обзором готовности миссии.

tnt22

http://www.isro.gov.in/Spacecraft/irnss-1h
Цитировать
IRNSS-1H
IRNSS-1H will be launched into a sub Geosynchronous Transfer Orbit (sub-GTO) with a 284 km perigee and 20,650 km apogee with an inclination of 19.2 deg with respect to the equatorial plane. After injection into this preliminary orbit, the two solar panels of IRNSS-1H are automatically deployed in quick succession and the Master Control Facility (MCF) at Hassan takes control of the satellite and performs the initial orbit raising manoeuvres using the Liquid Apogee Motor (LAM) of the satellite, thereby finally placing it in its designated slot in the inclined Geosynchronous orbit.

While IRNSS-1H joins the constellation for providing navigation services, IRNSS-1A will be used for messaging services. IRNSS 1H comes with more flexibility in service and it is compatible with the satellites, which are in orbit.

Payloads: Like its other IRNSS predecessors, IRNSS-1G also carries two types of payloads – navigation payload and ranging payload. The navigation payload of IRNSS-1G will transmit navigation service signals to the users. This payload will be operating in L5-band and S-band. Highly accurate Rubidium atomic clocks are part of the navigation payload of the satellite. The ranging payload of IRNSS-1H consists of a C-band transponder, which facilitates accurate determination of the range of the satellite. IRNSS-1H also carries Corner Cube Retro Reflectors for laser ranging.

Launch of PSLV-C39/IRNSS-1H is Scheduled on Thursday, Aug 31, 2017 at 18:59 hrs from Satish Dhawan Space Centre, SHAR, Sriharikota

Launch Vehicle:
PSLV-C39/IRNSS-1H Mission

Type of Satellite:
Navigation

Manufacturer:
ISRO

Owner:
ISRO

Application:
Navigation

tnt22

http://www.isro.gov.in/update/29-aug-2017/mission-readiness-review-mrr-committee-and-launch-authorisation-board-lab-have
ЦитироватьAug 29, 2017
Mission Readiness Review (MRR) committee and Launch Authorisation Board (LAB) have cleared the 29hr countdown of PSLV-C39/ IRNSS-1H Satellite mission for Wednesday, Aug 30, 2017 starting at 14:00 hr IST, the launch of PSLV-C39/IRNSS-1H Satellite mission for Thursday, Aug 31, 2017 at 19:00 hr IST.

tnt22

ВНИМАНИЕ !

Изменено время старта. Новое время старта

http://www.isro.gov.in/launcher/pslv-c39-irnss-1h-mission
ЦитироватьLaunch of PSLV -C39/IRNSS-1H is Scheduled on Thursday, Aug 31, 2017 at 19:00 hrs from Satish Dhawan Space Centre, SHAR, Sriharikota

tnt22

http://www.isro.gov.in/update/30-aug-2017/29-hrs-countdown-operations-of-pslv-c39-irnss-1h-mission-have-started-wednesday
ЦитироватьAug 30, 2017
The 29 hrs countdown operations of PSLV-C39/IRNSS-1H mission have started on Wednesday, Aug 30, 2017 at 14:00hr IST

tnt22

http://www.isro.gov.in/pslv-c39-irnss-1h-mission/curtain-raiser-video-of-irnss-1h-english
Цитировать
Curtain Raiser Video of IRNSS-1H (English)
http://www.isro.gov.in/sites/default/files/videos/irnss-1h-english.mp4.mp4
Description: Curtain Raiser Video of IRNSS-1H (English)
 Format : MP4
 File Size : (75.24 MB)
 Duration : 00:08:50
 Plugin : NA
Video

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http://spaceflight101.com/pslv-c39/pslv-set-for-irnss-replacement-launch/
ЦитироватьIndia's PSLV set for IRNSS Navigation Satellite Replacement Launch to Mitigate Clock Issues
August 30, 2017

The Indian Space Research Organization is counting down to the launch of a Polar Satellite Launch Vehicle on Thursday with a revamped IRNSS navigation satellite set to provide critical replacement capacity to begin dealing with a systemic clock issue that is affecting India's first IRNSS generation.

Liftoff fr om the Satish Dhawan Space Center is planned at 13:30 UTC and the four-stage PSLV will be in action for 19.5 minutes to deliver the IRNSS-1H satellite into a sub-GTO orbit fr om where it will maneuver up into an inclined Geosynchronous Orbit to replace the constellation's first satellite that has lost all its onboard clocks due to short circuits.
Спойлер

Photo: Indian Space Research Organization

The Indian Regional Navigation Satellite System (IRNSS) was inaugurated in July 2013 when its first satellite was sent into orbit to begin establishing a seven-satellite constellation in Geostationary and inclined Geosynchronous Orbits to deliver coverage to the Indian Subcontinent and surrounding regions. Independent access to navigation was seen as a priority to eliminate India's reliance on outside systems such as GPS that may not be available in times of distress.

With initial concepts drawn up in 2006, IRNSS was designed to be multi-level redundant: on the individual satellite level, each member of the constellation carries three atomic timekeepers in a two-redundant architecture and the constellation level was laid out to operate seven satellites at any time, allowing one to fail without affecting the operation of the system. Additionally, two spare satellites were built to remain in a flight-ready configuration to be available for launch on short notice.


IRNSS Constellation – Image: ISRO

IRNSS reached its initial operational capability in early 2016 with five satellites in operation and the final two followed by July of last year, allowing IRNSS to head into its fully operational phase. However, beginning in mid-2016, IRNSS-1A – the oldest of the constellation – experienced failures of its onboard rubidium atomic clocks, eventually losing all three time keepers, putting the satellite into a severely degraded state as it could only output coarse signals that were not useful for precise navigation.

The IRNSS constellation uses the same rubidium atomic frequency standard clocks as the European Galileo positioning, navigation and timing system and China's Beidou navigation architecture. Reports emerged in January that clocks on the Galileo constellation were failing at an alarming rate with both types of clocks on the satellites being affected – the robust rubidium clocks and the more precise Hydrogen Masers.

>> IRNSS Satellite & Constellation Overview


Photo: ISRO

All clocks on Galileo, IRNSS and China's Beidou-2 constellation were manufactured by Swiss company Spectratime, but the Beidou clocks were built before a defective component was introduced into the subsequent production series, sparing the Chinese fr om clock troubles on their constellation. The early Galileo In-Orbit Validation Satellites have also shown stable operation of their rubidium clocks which were built to the previous production specification.

An investigation into the problem isolated the in-orbit failures to a short circuit in an inexpensive electronics component used on the rubidium clocks while the problems on Galileo's Hydrogen Masers were traced to a separate issue related to how the masers are switched on and off, implementing procedural changes to work around the problem.

A comparison between failure signatures showed the clocks on Galileo and IRNSS-1A failed in the exact same fashion, building further confidence in the fault tree analysis and repair procedure worked out for existing rubidium clocks. As a result, clocks already installed on Galileo satellites awaiting launch and IRNSS ground spares were removed and shipped back to undergo repairs and re-tests.

To extend the operational lives of the satellites already in orbit, ISRO changed the procedure of how the three clocks are run. Initially, two of the clocks were kept running with one in primary mode and one as a hot backup while the third was powered off. As a life extension measure, ISRO decided to have only one clock running and two powered off, only activating the backup clocks when the primary one encounters a problem.


IRNSS-1H during final testing – Photo: IRNSS

Reports emerged in June that up to four clocks in addition to those on IRNSS-1A have suffered problems, but ISRO did not confirm these press reports.

Work has already been underway within ISRO's Satellite Applications Center to develop rubidium clocks for the next generation of IRNSS satellites set to take over from the first generation in the mid-2020s and ISRO also signed an agreement with Israel regarding cooperation in development of spaceborne atomic clocks, likely in an effort to implement clocks from two vendors on the next satellite generation to eliminate the risk of a single systemic issue causing a constellation-wide interruption.

The IRNSS-1H satellite is identical to the other first generation IRNSS satellites but implements repaired rubidium clocks featuring the same fix as those being currently integrated into a group of four Galileo satellites targeting liftoff in December. The IRNSS-1H satellite weighs 1,425 Kilograms and will be dispatched into a sub-GTO type orbit from wh ere it will maneuver into the western IGSO plane of the IRNSS constellation wh ere it will take over for the 1A satellite. ISRO is also expecting to launch the IRNSS-1I satellite before the year is out to place another operational spare into orbit to be able to quickly respond if another satellite loses all of its atomic clocks.


Photo: ISRO

Thursday's launch will be the 41st flight of India's PSLV rocket that handled all seven previous IRNSS missions, leveraging the raw power of solid rocket motors in combination with the precision of liquid-fueled engines to accurately inject payloads into a variety of orbits.

When flying in its XL configuration, PSLV weighs in at 321 metric tons and employs a stack of four stages plus six strap-on solid rocket boosters. PSLV sports a 20.3-meter long first stage holding 138 metric tons of solid propellant with six extended Solid Rocket Boosters clustered around it, each holding another 13 tons of propellant to deliver the kick needed to send the vehicle on its way with a maximum thrust of over 800 metric-ton-force.

The 12.8-meter second stage is outfitted with a 799kN Vikas engine consuming 40,700kg of toxic hypergolic propellants while the third stage burns 6,700kg of solid fuel to accelerate the stack onto a sub-orbital arc. In charge of finishing the boost to orbit is the fourth stage, powered by a pair of low-thrust engines using a hypergolic propellant combination.

>> PSLV Launch Vehicle

The PSLV rocket entered countdown operations on Wednesday, 29 hours prior to the planned liftoff time to undergo propellant loading operations to fill the fourth stage with two metric tons of propellants before proceeding with loading the second stage and the first stage's roll control system. Standing tall atop the Second Launch Pad at Satish Dhawan, PSLV C39 will be put through a last round of tests before pressing into the final countdown phase that includes flight software load on the vehicle and a 12-minute automatic sequence to ready the vehicle for flight.

Launch Profile

Photo: ISRO (File)

When clocks hit zero, the PS1 stage will fire its ignition system followed by ignition commands issued to two pairs of Solid Rocket Boosters at T+0.42 and T+0.62 seconds, creating a total thrust of 700,600 Kilogram-force. Jumping off its launch pad, the 44.4-meter tall PSLV will climb vertically for a short moment before pitching over to start flying south-east across the Indian Ocean, aligning itself with its planned ascent trajectory headed for a sub-GTO type orbit.

>> Flight Profile

The remaining two Solid Rocket Boosters begin firing at T+25 seconds when PSLV will be 2.7 Kilometers in altitude, increasing the total thrust of the vehicle to 803 metric tons, further accelerating the launcher. Each of the boosters burns for 49.5 seconds, but to ensure a clean separation and off-shore impact, PSLV will hold the ground-lit boosters until T+1 minute and ten seconds when they will be separated in pairs, 0.2 seconds apart at an altitude of 24 Kilometers. The air-lit boosters will tail-off for separation one minute and 32 seconds into the flight.

The massive first stage will continue firing, delivering 496 metric tons of thrust as it burns through 138,000 Kilograms of solid propellant in just 105 seconds, lofting the vehicle to an altitude of 56 Kilometers and a speed of 2.4km/s. Separation of the first stage is expected one minute and 50 seconds into the flight with second stage ignition an instant later.

The Vikas 4 engine of the second stage will soar up to a thrust of 81,500 Kilogram-force for a burn of just over 2.5 minutes. Starting the second stage burn, the vehicle will transition from a pre-determined attitude profile flown during PS1 to Closed Loop Control to dynamically adjust its flight profile based on measured navigation data in order to meet its cutoff targets.

At T+3 minutes and 23 seconds, the vehicle will have reached an altitude of 115 Kilometers, making it safe to separate the protective payload fairing since aerodynamic forces no longer present a danger to the satellite at that altitude. The second stage will conclude its burn and separate at T+4:23, reaching an altitude of 135 Kilometers and a speed of 5.38km/s.


Image: ISRO

Third stage ignition occurs one second after staging, starting a burn of 113 seconds during which the stage will deliver 24,900 Kilogram-force of thrust. After burnout of the third stage, PSLV will keep holding onto the stage for the nominal Stage 3-4 coast phase that is designed to allow the stack to gain altitude ahead of the fourth stage burn. It also allows the third stage to tail off any residual thrust to ensure a safe separation. The coast lasts from T+6:17 to T+10:07, a period during which the stack climbs from 135 to 185 Kilometers.

Separation of the third stage is expected ten minutes and seven seconds into the flight followed ten seconds later by the ignition of the fourth stage's L-2-5 engines on a burn of eight minutes and 32 seconds. IRNSS-1H is targeting an insertion orbit of 284 by 20,650 Kilometers at an inclination of 19.2 degrees.

IRNSS-1H will be separated from the PSLV at T+19 minutes and 25 seconds at an altitude of 507 Kilometers and an insertion speed of 9.6km/s.

Very shortly after separation, the satellite will deploy its two power-generating solar arrays, establish communications with ground stations and stabilize its three-axis orientation. Over a period of days, the spacecraft will complete four burns of its Liquid Apogee Motor to ins ert itself in to a 29-degree inclined Geosynchronous Orbit at 55 degrees East longitude wh ere it can take over from IRNSS-1A.
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us2-star

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Ещё трансляции (ДМВ)
[TH]
[/TH][TH]Канал[/TH][TH]Адрес[/TH][TH]Начало[/TH]
PTI News Corporationyoutube.com/watch?v=EolvTp_A6AE31 августа, 16:29
WC Dailyyoutube.com/watch?v=9zardpS8nDE31 августа, 16:00

Pirat5

по информации орбита - "kwazigeostacjonarna (i=29º, pozycja 55ºE)"

Наклонные ГЕО – описывают «восьмёрку» (наклонение 29°)
Квази-ГЕО - (с наклонением порядка 5°, НК №5-2015, с.53)
Что такое «kwazigeostacjonarna (i=29º, pozycja 55ºE)», не совсем понятно.

это или Квази-ГЕО в точку 55°, в дополнение к «восьмёрке» IRNSS 1A и 1В
или замена  IRNSS 1A или 1В

где ошибка?

tnt22

Ещё трансляции (ДМВ)
[TH]
[/TH][TH]Канал[/TH][TH]Адрес[/TH][TH]Начало[/TH]
Space Videos
youtube.com/watch?v=bcwAihXNffs
31 августа, 16:15
OurUniverse
youtube.com/watch?v=pc51vu-Q-x4
31 августа, 16:00

tnt22

https://spaceflightnow.com/2017/08/31/pslv-c39/
ЦитироватьIndian rocket ready for launch to enlarge country's navigation satellite fleet
August 31, 2017 Stephen Clark

An Indian Polar Satellite Launch Vehicle is scheduled for liftoff Thursday with the eighth satellite for the country's regional navigation network, replacing a spacecraft launched four years ago with faulty payload components.

The PSLV is set for launch at 1330 GMT (9:30 a.m. EDT) Thursday from the Satish Dhawan Space Center on India's east coast. The 29-hour countdown began Wednesday, and filling of the rocket's liquid propellant tanks was underway in the final hours of the countdown.
Спойлер

The PSLV's liquid-fueled second stage is lifted atop the rocket's first stage during preparations before the IRNSS 1H launch. Credit: ISRO

Liftoff is timed for 7 p.m. Indian Standard Time.

The 144-foot-tall (44-meter) PSLV will heave the eighth satellite in the Indian Regional Satellite System — IRNSS 1H — into an orbit stretching more than 12,800 miles (20,650 kilometers) above Earth.

IRNSS 1H will replace the first Indian navigation satellite in the IRNSS fleet — IRNSS 1A — stricken with failed atomic clocks, eliminating its ability to transmit precise position data to users on the ground. Designed for a 10-year mission, IRNSS 1A is otherwise healthy can still be used for basic message relay functions, according to the Indian Space Research Organization.

The three rubidium atomic clocks on the IRNSS 1A satellite have failed since its launch in July 2013, leaving the spacecraft powerless in achieving its primary mission. Sourced from a Swiss company, the clocks are needed to keep precise time on the satellite, a measure needed to help derive the exact location of a receiver on the ground.

The rubidium clocks come from the same vendor as several clocks that have failed on Europe's Galileo navigation satellites. Engineers say they have fixed the clocks on the IRNSS 1H spacecraft set for launch Thursday, and the launch of the next batch of four European Galileo navigation satellites was delayed from earlier this year until December to ensure their clocks will not succumb to the same problem.

Launching with six lengthened solid rocket boosters — a configuration ISRO calls the PSLV XL — India's workhorse launcher will head east from the Satish Dhawan Space Center over the Bay of Bengal following liftoff Thursday. The six boosters, each packed with 12 metric tons of pre-loaded solid propellant, will fire more than a minute. Four of the motors will ignite at liftoff, and the other pair will ignite at T+plus 25 seconds.

A core first stage solid-fueled motor will burn in unison with the six strap-on boosters. The PSLV's core and boosters will collectively generate 1.7 million pounds of thrust.

The first stage will drop away at T+plus 1 minute, 50 seconds, at an altitude of more than 180,000 feet (55 kilometers). A single hydrazine-fueled Vikas engine will ignite for a firing lasting two-and-a-half minutes, propelling the rocket to 11,000 mph (5 kilometers per second).


The IRNSS 1H satellite. Credit: ISRO

The rocket's clamshell-like payload shroud will peel away during the second stage burn at T+plus 3 minutes, 23 seconds, once the launcher has climbed above the dense lower layers of the atmosphere.

A solid-fueled third stage motor will ignite at T+plus 4 minutes, 23 seconds, and burn nearly four minutes. The fourth stage, powered by two hydrazine-fueled thrusters producing around 3,400 pounds of thrust, will then take over at T+plus 10 minutes, 16 seconds, for a eight-and-a-half minute firing to inject the mission's navigation payload into an elliptical, oval-shaped orbit high above Earth.

The PSLV's flight computer will aim to release the IRNSS 1H satellite in an orbit between 176 miles (284 kilometers) and 12,831 miles (20,650 kilometers). The target orbit has an inclination of 19.2 degrees to the equator.

Deployment of the IRNSS 1H satellite is scheduled for T+plus 19 minutes, 25 seconds.

IRNSS 1H's on-board engine will circularize its orbit at an altitude of nearly 22,300 miles (35,800 kilometers) in the first few weeks after launch. The satellite's final operational geosynchronous orbit will be tilted 29 degrees to the equator, a perch that will oscillate north and south of the equator at 55 degrees east longitude.

In that orbit, IRNSS 1H will stay constantly in the sky over India. Like its predecessors, the IRNSS 1H satellite is built for a 10-year mission.

Unlike U.S., Russian, European and Chinese navigation fleets designed for global reach, India's navigation satellite constellation is intended to provide positioning services over the country's domestic territory and neighboring nations.
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