Чем провинилась Сумбандила?

[Дмитрий Виницкий]

HTTP 403) Access denied может там на чешские IP обиделись<

[Salo]

Вот ссылка на файл с газетой:
http://www.makeyev.ru/gazeta/9-2009.zip

[Дмитрий Виницкий]

А уже везде показывает.

[Salo]

http://www.itweb.co.za/index.php?option=com_content&view=article&id=30696:sas-second-satellite-delivers&catid=260:telecoms&Itemid=59

SA's second satellite delivers

SA received the first live images from its second satellite, Sumbandila, this week.

SA's progression into space started over a decade ago and the country expects to make further strides in this area, says Lunga Ngqengelele, acting head of communications for the Department of Science and Technology (DST).
These images represent just the first development expected from the satellite, adds Ngqengelele.
He says the next step is to use the images to serve many functions in SA and help address certain needs.
"It can help the country in many ways. It can help SA in dealing with climate change, we can detect the movement of people in terms of informal settlements and then agriculturally can determine which land can still be used," explains Ngqengelele.
The DST says the satellite can collect images during national emergencies, such as floods and fires, and can also map infrastructure and land use, and measure the water levels of dams.
"So the next step just depends on what we want to find out. Based on what the government wants, we will be able to get the images," states Ngqengelele.
The DST says the satellite carries a secondary communication payload from the Department of Communications, in addition to the camera, since, according to Ngqengelele, government will also use the satellite for communications.
SA now also has the chance to provide images to other countries, just as it had once paid for satellite images that only other countries could provide. Ngqengelele says: "In the long run, we hope to assist other African countries with the satellite and we expect that they will get images from us. Basically, it's an investment for us and it is moving forward."

Great success

World Wide Worx Strategy MD Steven Ambrose says: "The pictures are a reflection of South African technical prowess and perseverance despite all manner of obstacles in the realisation of the project. The high-resolution and the fact that these are being received by a South African organisation, from a largely South African satellite, is a great success.
"The main developments going forward will be in the science and research that the satellite facilitates or enables. It also provides impetus for further development in the education arena around space technology and imaging, which will be good for government and industry in SA," says Ambrose, describing what else should be expected from Sumbandila.
He adds that the success in launching this satellite and now receiving pictures from it puts the country in the "space race" in a small way. It will allow for imaging of SA to a degree that wasn't possible before.

The CBD and harbour area in East London as pictured
by Sumbandila, South Africa's second satellite.


The Bridle Drift Dam in East London as pictured
by Sumbandila, South Africa's second satellite.

[Yra Napr]

http://sumbandilamission.blogspot.com/2010/03/6-months-in-space-today.html

17 MARCH 2010
6 months in space today!
Time flies when you're having fun!  We are indeed grateful for this milestone and look forward to many more happy anniversaries.  Some mission stats to date:
Number of orbits: 2,750
Months in space: 6 (today!)
Distance travelled: 0.74 AU
Activities uploaded: 1900
Images taken successfully: 93
Firmware uploads:  25
ADCS SW updates:  12

За пол-года 93 снимка :?:  Или я чего-то не понимаю :?:

[Лютич]

Тут надо иметь в виду две вещи.
а) неизвестно, сколько длилась приемка спутника (а с ней были проблемы по части наземки, о чем они вполне честно сказали)
б) сброс информации у них возможен только при пролете над ЮАР, а объем бортовой памяти ограничен.

[Yra Napr]

У Сумбандилы, кстати, не все так хорошо:

Although a hugely successful mission thus far, the past six months have unfortunately not been without incident.  We suffered a permanent loss of the Z-axis reaction wheel early on during commissioning, where after the ADCS algorithms have been adapted so as to still allow for controlled imaging with the remaining two wheels - Yaw-control was then slightly impeded and the off-Nadir Roll angle limited to ±20°.
 
Due to a power system anomaly, we have sadly lost access to one of the two CCD control boards.  Each control board interfaces to one three-colour CCD.  The board we lost contains the Green, Xantrophyl and Blue spectral bands, and the remaining board the Red, Red-Edge and Near-Infrared bands.
 
We have recently also lost the Y-axis reaction wheel (most likely also due to a power distribution failure), this meant the loss of three-axis control, but amazingly we can still take high-resolution images as before:  the ADCS algorithms have been updated very innovatively whereby the satellite now "flies" in a derived Y-Thompson mode (the satellite tumbles "head-over-heals").  The spin rate in the Pitch axis is now 0.959°/s which results in an Forward Motion Compensation (FMC) rate of 4.  This allows the imager to scan a target from back-to-front from the point where the satellite is pitched 15° forward over the target, to the point where it points 15° backwards.  During the period that the image is scanned, the Roll angle is controlled by the remaining X-axis wheel, where the off-Nadir Roll angle is now limited to ±5°.  The magtneto-torquers are used to phase the Pitch-rate such that the sub satellite point overlaps with the desired target at the center of the image.
 
We have obtained very good imaging results in this new control mode (see Miami and Dubai images in a separate post).  The same controller is also used during data download sessions, but with a Pitch rate of 0.6°/s, and a Roll angle close to zero.  During three download sessions last week on the same day, we managed to capture 6.3GB of image data via the S-band transmitter link, running at 72 Mbit/s!
Posted by Sunspace Administrator at 3/30/2010 04:11:00 PM

Такие вот пироги.
Для полного счастья не хватает еще, чтобы Блиц на две половинки развалился.

Разъясните, пожалуйста, что в спутнике ЮАРовское, а что делало ГРЦ?
А то вроде как тема началась с того, что ЮАРовский спутник (я так понял, изготовленный в Африке) просто отказались запускать "Штилем", а потом пишется, что ГРЦ разработал и документацию, и мат. часть изготовил, и т.д.

[Лютич]

В спутнике от ГРЦ ничего.
Все, что ГРЦ сделал из матчасти, это переходник, да и тот по результатам Лавке пришлось дорабатывать напильником, потому что в оригинальном варианте не учли ни "парение" органических и вязких материалов, ни электростатику.

[ZOOR]

Похоже, что основное назначение КА - ДЗЗ - уже не функционирует.
Во-всяком случае никаких сообщений по поводу года на орбите не заметно - http://sumbandilamission.blogspot.com/

А вот скандальчик на уровне правительства кажется был  (КА не протянул и года из заявленных трех)  -  http://www.dst.gov.za/SunSpace%20-%20apology.pdf  , но его успешно замяли - http://www.dst.gov.za/sa-satellite-performing-well

Хотя радиолюбители еще могут работать через спутник - http://www.arrl.org/news/oscar-67-satellite-active-for-jota

Кажется, что МКА провинился только тем, что полетел в этом пуске  

[Лютич]

А иного варианта пускать и не было.
Потому что ГРЦ заключил такой замечательный контракт, что запрет МО не попал в категорию форс-мажора. И они спутник либо пускали, либо возвращали все уплаченные деньги взад.

[ZOOR]

В спутнике от ГРЦ ничего.

А иного варианта пускать и не было.

Извините, взаимосключаюшие фразы, если исходить из контекста.

ГРЦ кажись опять будет работать на буржуинов - http://www.federalspace.ru/main.php?id=2&nid=13133

[Лютич]

В спутнике от ГРЦ ничего.

А иного варианта пускать и не было.

Извините, взаимосключаюшие фразы, если исходить из контекста.

Нет, все верно.
В спутнике ГРЦ не делало ничего. Для спутника он должен был обеспечивать запуск.
И, что характерно, не смог.
Обеспечивать пришлось НПОЛу на пару с НПОМом.

[Pol]

Зомби, просто зомби

http://www.satnews.com/cgi-bin/story.cgi?number=2074207429

February 29, 2012

Sumbandila Is Undead...It Lives

They are small but mighty — they take a licking and keep on ticking
South Africa's Sumbandila Earth observation microsatellite is not totally dead. "We still 'see' Sumbandila, monitor the solar panels, check the battery levels and now and again receive its signal," South African National Space Agency (Sansa) Space Operations and Earth Observation MD Raoul Hodges told Engineering News Online.

"Radio hams are still using Sumbandila to relay messages. The satellite is not completely inactive but we can't switch on the imager and it can't be used for Earth observation or the downloading of data. But it is still useful as a training tool."

Hodges is seeking to preserve expertise gained with the Sumbandila programme. Sansa's Space Operations division (while still the Satellite Applications Centre of the Council for Scientific and Industrial Research) set up a Mission Control Centre to operate the locally-designed and built microsatellite.

"I've taken those skilled staff and moved them to other units which do similar work, so we don't lose or diminish our mission control expertise. We're upgrading the Mission Control software, as we're convinced that there will be future [South African] satellites," he said.
Sumbandila still has about 30 percent of its fuel left, which, in theory, could be used to boost the spacecraft to a higher altitude and extend its orbital life. In practice, it is uncertain if the satellite would actually respond to commands to fire its thruster. Sumbandila was planned to survive for only three years.

Space Operations is, of course, heavily involved in supporting many satellites and other spacecraft from other countries. "Some interesting birds are coming over the horizon," enthused Hodges, referring to new satellites that will be launched this year. "As a space agency, we have to be on top of the next Earth observation satellites, their sensors, what they can do, what we could and should buy into."

Article by Keith Campbell available
http://www.engineeringnews.co.za/article/south-african-satellite-is-undead-2012-02-29/