Цюэцяо – CZ-4C – Сичан (XSLC) – 20.05.2018, 21:28 UTC

Автор che wi, 29.10.2016 14:30:51

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che wi

Китай запустит спутник-ретранслятор для лунной программы

ЦитироватьПЕКИН, 2 мар — РИА Новости, Иван Булатов. Китай планирует запустить в космос спутник ретрансляции данных для своей программы по зондированию Луны "Чанъэ", заявил ведущий научный сотрудник программы Е Пэйцзянь.

По его словам, спутник-ретранслятор должен помочь поддерживать связь между Землей и спутником, который совершит посадку на обратной стороне Луны, передает агентство Синьхуа. Ученый сообщил, что запуск спутника ретрансляции данных будет осуществлен за полгода до запуска спутника "Чанъэ-4", намеченного на 2018 год.

В середине января Государственное управление оборонной науки, техники и промышленности КНР сообщило, что в 2018 году аппарат "Чанъэ-4" должен совершить посадку на обратную сторону Луны.


Quооndo

Вот китайцы молодцы сумели нас опередить даже по новой российской программе исследования Луны. Возможно и высадятся первыми.

Старый

ЦитироватьQuооndo пишет:
Вот китайцы молодцы сумели нас опередить даже по новой российской программе исследования Луны. Возможно и высадятся первыми.
Какими высадятся китайцы не знаю, но мы не высадимся никакими. НННШ.
1. Ангара - единственная в мире новая РН которая хуже старой (с) Старый Ламер
2. Назначение Роскосмоса - не летать в космос а выкачивать из бюджета деньги
3. У Маска ракета длиннее и толще чем у Роскосмоса
4. Чем мрачнее реальность тем ярче бред (с) Старый Ламер

che wi

ЦитироватьPrimary Design of the Flight Profile of the Relay Satellite
 
The relay satellite is directly launched into the Earth-Moon transfer trajectory with the perigee at 200km and the apogee at 380000km.

The flight takes about 5~6 days and requires 2~3 times of trajectory correction maneuver (TCM). The relay satellite brakes at the perilune and becomes stable in manifold instead of orbiting the moon as it decelerates. After 3~4 days, the relay satellite approaches the L2 point and reaches the plane that is formed by the normal of lunar orbit and the ligature of the Earth and the moon.

After arriving at the L2 point, the relay satellite carries out three times of orbit control at the first orbit revolution to enter the mission orbit. The mission orbit is a halo orbit and the relay satellite will carry out relay communication and scientific test.



http://engine.scichina.com/publisher/scp/journal/SCTS/doi/10.1007/s11431-016-9034-6

PIN

Кто-нибудь понимает, почему разные диапазоны (S и X) используются в разных каналах? Я чой-то не соображу...

thunder26

ЦитироватьPIN пишет:
Кто-нибудь понимает, почему разные диапазоны (S и X) используются в разных каналах?
В смысле почему S в КА-Земля, а Х в КА-Луна?
Очень трудно сделать точный прогноз, особенно о будущем (с) Нильс Бор


thunder26

Ну если предположить:
- участок S-диапазон для космических исследований выделен МСЭ для данной миссии;
- в Х-диапазоне также есть участок для космических исследований и в нем антенна на лендере и ровере меньше, чем если бы это был S-диапазон.
Очень трудно сделать точный прогноз, особенно о будущем (с) Нильс Бор

PIN

По первому пункту вариант: на имеющейся платформе по умолчанию S и оказалось, что его пропускной способности достаточно и для "науки".
По второму - скорее так, согласен

instml

Два попутчика

DSLWP A1, A2

DSLWP A1 and A2 are two identical Chinese lunar microsatellites mission to perform ultra long-wave astronomical observations developped at the Harbin Institute of Technology.

The 45 kg micro-satellites are to be launched piggy-back with Chang'e 4 Relay, but ins ert them bysemself in to a 200 km × 9000 km lunar orbit. The satellites are three-axis stabilized and carry a radio-astronomy payload featuring two linear polarization antennas mounted along and normal to the flight direction, which uses the moon as a shield to avoid radio emmanations from earth. Additionally, the satellites carry a King Abdulaziz City for Science and Technology (KACST) developed micro-optical camera and a amateur radio communications system.

Nation:   China
Type / Application:   Lunar Orbiter
Operator:   Harbin Institute of Technology
Contractors:   Harbin Institute of Technology
Propulsion:   ?
Power:   Solar array, batteries
Mass:   45 kg
Orbit:   200 km × 9000 km lunar orbit

http://space.skyrocket.de/doc_sdat/dslwp-a.htm
Go MSL!


che wi

Цитировать/.../
"In the first half of 2018, we will first launch a relay satellite to Lagrange L2 Point, where the satellite can keep communications with both the far side of the Moon and the Earth. Therefore, we can control the lunar probe for data transmission using this relay satellite," said Zhao.
/.../
http://english.spacechina.com/n16421/n17212/c1828849/content.html

tnt22

ЦитироватьAndrew Jones‏ @AJ_FI 6 ч. назад

Chang'e-4: It was announced today that the relay satellite to launch in May to facilitate communications with lander & rover on lunar far side will be called QueQiao (鹊桥), while the 2 microsatellites are named LongJiang-1 & 2 (龙江一号/二号)

5 ч. назад

The Chang'e-4 relay satellite name Queqiao comes from the love story 'the Cowherd & the Weaver Girl'. Separated by the silver river (Milky Way), every year a flock of magpies form a bridge (QueQiao) to bring the lovers together for a day. https://en.wikipedia.org/wiki/The_Cowherd_and_the_Weaver_Girl ...

tnt22

#14
https://gbtimes.com/change-4-lunar-far-side-satellite-named-magpie-bridge-from-folklore-tale-of-lovers-crossing-the-milky-way
ЦитироватьChang'e-4 lunar far side satellite named 'magpie bridge' from folklore tale of lovers crossing the Milky Way
by Andrew Jones Apr 24, 2018 09:25 GERMANY  MOON  CHINA'S SPACE PROGRAM


A rendering of the Chang'e-4 relay satellite, to launch in May 2018, and lander and rover to set down on the lunar far side in late 2018. Chinese Academy of Sciences

China's Chang'e-4 relay satellite, which will launch next month to facilitate communications with a lander and rover on the lunar far side, has been named Queqiao - or magpie bridge - from a Chinese myth.

The name was announced by the China National Space Administration (CNSA) in Harbin, northeast China, on Tuesday April 24 at an event marking the advent of China's third Space Day.
Спойлер
The name comes the Chinese myth and love story of the Weaver Girl and the Cowherd. Separated by the Silver River, which symbolises the Milky Way, the lovers are reunited for one day each year by a bridge formed by a flock of magpies - Queqiao (鹊桥) - allowing them to cross the heavens.

Two microsatellites, which will accompany the launch in May and be placed in lunar orbit, also received names.

These are Longjiang-1 and Longjiang-2 (龙江一号 and 龙江二号), meaning Dragon River 1 and 2. The developer of the microsatellites is the Harbin Institute of Technology, situated in the capital of Heilongjiang (Black Dragon River) Province. The Heilongjiang river is also known as the Amur.


Star-crossed lovers Niulang and Zhinu are permitted to be together one day a year, during the Qixi Festival. The painting is in the Long Corridor of the Summer Palace in Beijing. Public Domain
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Queqiao relay satellite

Chang'e-4 is a mission which will attempt the first-ever soft-landing on the far side of the Moon with a lander and rover in late 2018.

As the lunar far side never faces the Earth, a relay satellite is required to be in place to facilitate communications between terrestrial ground stations and the Chang'e lander and rover.

It is planned to launch from the Xichang Satellite Launch Centre on May 21 via a Long March 4C rocket.
Спойлер
The Queqiao relay satellite is based on a small satellite platform developed by the China Academy of Space Technology (CAST), and equipped with modified and newly developed components in order to meet the extra challenges posed by its mission requirements.

The satellite will operate in a halo orbit around the gravitationally stable second Earth-Moon Lagrange Point, more than 60,000 kilometres away from the lander and rover on the lunar far side.


Launch profile for the Chang'e-4 communications relay satellite. Chinese Academy of Sciences

The distance will be around twice that of satellites in geosynchronous Earth orbit for terrestrial communications, while also being close to half a million kilometres from Earth, meaning greater power demands.

The halo orbit will allow Queqiao to be accessible to both ground stations on Earth and the lander on the lunar far side at times.


Image demonstrating a halo orbit around the second Earth-Moon Lagrange point, from which the Chang'e-4 communications relay satellite will operate. NAOC/CAS

It will reach this point some eight or nine days after launch from Xichang via a lunar swing-by. Once in its planned orbit, the satellite will carry out tests for its communications relay role and begin its science experiments.

As well as its main communications role, the relay satellite will carry the Netherlands-China Low-Frequency Explorer (NCLE) for low-frequency radio astronomy experiments.

The Longjiang-1 and 2 microsatellites, meanwhile, will test low frequency radio astronomy and space-based interferometry, as well as amateur radio activities. It will also carry a small optical camera developed by Saudi Arabia.


Testing on the Chang'e-4 DSLWP-A1 and DSLWP-A2 microsatellites in early 2018. CCTV/Youtube/Framegrab
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Landing, roving and preparing
Спойлер
The lander and rover for the mission, launching late this year, were originally manufactured at the same time as the Chang'e-3 spacecraft, which landed on the Moon in late 2013, in order to provide a backup mission.

Now repurposed for objectives on the lunar far side, the pair have recently been progressing through space environment tests.

Five of the science payloads, including the cameras, radar and imaging spectrometer noted below, are inherited from the 2013 Chang'e-3 mission, but new and international payloads will also travel.


Chang'e-3, which landed on the Moon in December 2013. Chang'e-4, initially slated as a backup mission, will launch by 2020. CNS

The lander will carry a Landing Camera (LCAM), Terrain Camera (TCAM), Low Frequency Spectrometer (LFS), and Lunar Lander Neutrons and Dosimetry (LND), all of which were developed in Germany.

The rover will be equipped with a Panoramic Camera (PCAM), a Lunar Penetrating Radar (LPR), a Visible and Near-Infrared Imaging Spectrometer (VNIS), and an Advanced Small Analyser for Neutrals (ASAN), all from Sweden.

TCAM and PCAM on Chang'e-3 returned astounding images from Mare Imbrium.


A view of Mare Imbrium taken by China's Chang'e-3 mission. Chinese Academy of Sciences

Also joining the mission is a small, student-developed biosphere experimentthat includes potato and arabidopsis seeds and silkworm eggs.

The landing area will be within the scientifically intriguing South Pole-Aitken Basin. While some candidates, including the Von Kármán impact crater, have been noted, the precise landing site has not been publicly released.

For latest news and developments on the mission, see our feature on China's Chang'e-4 mission to the far side of the Moon


The far side of the Moon and the distant Earth, imaged by the Chang'e-5T1 mission in 2014. Chinese Academy of Sciences
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tnt22

ЦитироватьASTRON‏ @ASTRON_NL 7 ч. назад

The Netherlands Chinese Low-Frequency Explorer (#NCLE) successfully passed the last assessment by the Chinese space agency! The instrument will be launched on board the Chinese Chang'e 4 relay satellite to a position behind the Moon in May. @RadRadioLab @isis_space

tnt22

http://www.xinhuanet.com/english/2018-04/24/c_137133668.htm
ЦитироватьChina's Chang'e-4 relay satellite named "Queqiao"
Source: Xinhua | 2018-04-24 17:02:29 | Editor: ZD

HARBIN, April 24 (Xinhua) -- The relay satellite for the Chang'e-4 lunar probe expected to land on the far side of the Moon later this year, has been named "Queqiao" -- magpie bridge.

The name was announced by the China National Space Administration (CNSA)Tuesday, China's Space Day.

In a Chinese folktale, magpies form a bridge with their wings on the seventh night of the seventh month of the lunar calendar to enable Zhi Nu, the seventh daughter of the Goddess of Heaven, to cross and meet her beloved husband, separated fr om her by the Milky Way.

Together with the relay satellite, two microsatellites developed by the Harbin Institute of Technology, "Longjiang-1" and "Longjiang-2," will also be sent into orbit.

Work on Chang'e-4 is progressing well, said Li Guoping, a spokesman for CNSA.

Chang'e-4 will carry payloads for Germany, the Netherlands, Saudi Arabia and Sweden.
Спойлер
The far side of the Moon is of great scientific interest but landing there requires a relay satellite to transmit signals.

One of China's planned 36 launches this year, the relay satellite will be sent into the halo orbit of the Earth-Moon Lagrange Point L2 in late May, and the Chang'e-4 lunar lander and rover will be sent to the Aitken Basin of the south pole region of the Moon about six months later.

"We designed an orbit at the Earth-Moon Lagrange Point L2 about 450,000 kilometers from the Earth, wh ere a gravitational equilibrium can be maintained, and the relay satellite will be able to 'see' both the Earth and the far side of the Moon," said Bao Weimin, director of the Science and Technology Commission of the China Aerospace Science and Technology Corporation.

The Aitken Basin is an ancient lunar region containing lots of primeval information, and as the far side of the Moon is shielded from electromagnetic interference from the Earth, it is an ideal place to study the space environment. The probe can "listen" to the deeper reaches of the cosmos, said Bao.

The relay satellite will be carried by Long March-4 rocket. The relay satellite and rocket are both at the launch center in Xichang, southwest China's Sichuan Province.

"The whole mission is very complex and challenging. We feel great pressure, but we are confident," Bao said.
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tnt22

Цитировать.
Космические полёты Китая - ChinaSpaceFlight
35 минут назад

Китайский ретрансляционный спутник "Чанъэ-4" получил новое название

Харбин, 24 апреля /Синьхуа/ — Китайский ретрансляционный спутник для лунного зонда "Чанъэ-4", который, как ожидается, совершит посадку на дальней стороне Луны в конце текущего года, получил название QueQiao (鹊桥) "Цюэцяо" /"Сорочий мост"/. Об этом объявило Государственное космическое управление КНР во вторник, когда в Китае отмечается День космонавтики.
Спойлер
Древнекитайская легенда гласит, что сороки образуют мост, соединив крылья, в седьмую ночь седьмого месяца по лунному календарю, чтобы позволить Чжинюй, седьмой дочери Богини Сиванму — повелительницы Запада в китайском даосизме, пройти по нему и встретиться с любимым мужем, с которым их разделяет Млечный Путь. 

Вместе с ретрансляционным спутником на орбиту также будут выведены два микроспутника, разработанные Харбинским политехническим институтом /пров. Хэйлунцзян, Северо-Восточный Китай/ и названные соответственно LongJiang-1 & 2 (龙江 一号 / 二号) "Лунцзян-1&2".

Работа на лунном зонде "Чанъэ-4" идет хорошо, сообщил Ли Гопин, представитель Государственного космического управления. Лунный зонд "Чанъэ-4" будет перевозить грузы для Германии, Нидерландов, Саудовской Аравии и Швеции. 

Дальняя сторона Луны представляет большой научный интерес, однако для посадки на нее требуется ретрансляционный спутник для передачи сигналов. Спутниковый ретранслятор планируется отправить на гало-орбиту точки Лагранжа L2 между Землей и Луной в конце мая, а лунный зонд "Чанъэ-4" - в Бассейн Южный полюс-Эйткен Луны в конце текущего года.

...




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tnt22

https://gbtimes.com/chinas-yuanwang-7-space-tracking-ship-sailing-to-support-change-4-relay-satellite-launch
ЦитироватьChina's Yuanwang 7 space tracking ship sailing to support Chang'e-4 relay satellite launch
by Andrew Jones | May 04, 2018 15:19 | MOONCHINA'S SPACE PROGRAMXICHANG


China's Yuanwang 7 space tracking vessel after completing tasks related to the launch of the Tianzhou-1 cargo spacecraft in April 2017. CNS

China's Yuanwang 7 space tracking vessel is heading for waters in the Pacific Ocean ready to support the launch of the relay satellite which will facilitate the Chang'e-4 lunar far side lander and rover mission.

Yuanwang 7 is China's newest space tracking ship, which launched in July 2016 and was involved in the Shenzhou-11 mission, the debut flight of the heavy-lift Long March 5, and the Tianzhou-1 cargo spacecraft launch.

Having just assisted in the launch of the Apstar-6C satellite from Xichang on Friday, Yuanwang 7 is now sailing for an undisclosed location to support the launch of the Queqiao communications relay satellite, the Chinese language Science and Technology Daily reports.

The satellite is scheduled to launch from the Xichang Satellite Launch Centre on May 21 via a Long March 4C rocket, heading for an orbit beyond the Moon.

The Yuanwang ships, whose name means 'long view', are equipped with an array of dishes and electronics to support the launching and tracking of space launch vehicles. They observe trajectories and provide survey and control capabilities as rockets fly downrange.
Спойлер
Shortly after launch of the crewed Shenzhou-11 mission, Yuanwang 7 tracked the spacecraft for nearly 400 seconds and issued orders for the unfolding of solar panels and antenna, and perform other movements after entering orbit.

https://www.youtube.com/watch?v=ZuqJdBc2gj8
(video 1:23)
Yuanwang 7 Maritime Tracking of Shenzhou-11 Completed
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Lunar far side pioneer
Спойлер
The launch of the Queqiao satellite, scheduled for May 21, is a precursor to the Chang'e-4 lander and rover mission, which will attempt the first-ever soft-landing on the far side of the Moon in late 2018.

The relay satellite is required to be in place to facilitate communications between terrestrial ground stations and the Chang'e-4 lander and rover. Its intended halo orbit around the second Earth-Moon Lagrange point more than 60,000 kilometres beyond the Moon will make it accessible to both ground stations on Earth and the lander on the lunar far side at all times.

Queqiao means 'magpie bridge' and comes from the Chinese myth and love story of the Weaver Girl and the Cowherd.

As well as its main communications role, the relay satellite will carry the Netherlands-China Low-Frequency Explorer (NCLE) for low-frequency radio astronomy experiments.


A rendering of the Chang'e-4 relay satellite, to launch in May 2018, and lander and rover to set down on the lunar far side in late 2018. Chinese Academy of Sciences

Two microsatellites, named Longjiang-1 and Longjiang-2 (龙江一号 and 龙江二号), meaning Dragon River 1 and 2, will also be aboard for launch and will be placed in lunar orbit.

The pair will test low frequency radio astronomy and space-based interferometry, as well as carry an amateur radio payload developed by students at the Harbin Institute of Technology (HIT), and a microcameradeveloped by the King Abdulaziz City for Science and Technology (KACST) of Saudi Arabia.
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Lander and rover
Спойлер
The lander and rover - repurposed backups to the Chang'e-3 mission - will launch around six months later, in November or December, and attempt the first-ever soft landing on the lunar far side.

The candidate landing sites are within the South Pole–Aitken basin, a huge crater that may include lunar mantle excavated by the impact that formed it and thus offer unique insights into the interior of the Moon, what it is made of and how it formed.

The lander will carry a Landing Camera (LCAM), Terrain Camera (TCAM), a Low Frequency Spectrometer (LFS), and Lunar Lander Neutrons and Dosimetry (LND), with the latter developed in Germany.

The rover will be equipped with a Panoramic Camera (PCAM), a Lunar Penetrating Radar (LPR), a Visible and Near-Infrared Imaging Spectrometer (VNIS) and, from Sweden, an Advanced Small Analyser for Neutrals (ASAN).


The Chang'e-3 lander on Mare Imbrium, imaged by the Yutu rover. Chinese Academy of Sciences

TCAM and PCAM on Chang'e-3 returned astounding images from Mare Imbrium. The Chang'e-4 landing mission will also include a student outreach-inspired mini ecosystem, including potatoes, arabidopsis seeds and silkworm eggs.
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tnt22

ЦитироватьAndrew Jones‏ @AJ_FI 9 ч. назад

Yuanwang 6 tracking ship is on the way to the Pacific to support launch of the Chang'e-4 relay satellite launch. Yuanwang 7 already on the way https://www.zaobao.com.sg/realtime/china/story20180505-856440 ...