航空航天港

 找回密码
 注册会员

QQ登录

只需一步,快速开始

返回列表
查看: 27149|回复: 143
收起左侧

[任务跟踪] OneWeb的全球移动宽带野心-由700颗卫星组成的低轨Ku-band星座

  [复制链接]
gnss 发表于 2014-6-2 04:29 | 显示全部楼层 |阅读模式

对本站感兴趣的话,马上注册成为会员吧,我们将为你提供更专业的资讯和服务,欢迎您的加入!

您需要 登录 才可以下载或查看,没有帐号?注册会员

x
本帖最后由 cmj9808 于 2015-1-16 12:11 编辑

最近几天,全球知名航天媒体和博客都在报道Google在全球移动宽带方面的雄心-建设一个由360颗卫星组成的Ku-band低轨卫星通信星座,卫星将发布于18条轨道上,其中9根轨道的卫星位于800公里高度,另外9根轨道的卫星位于950公里高度。
相关报道见: http://blog.tmfassociates.com/

Google最近还挖走了O3b的首席技术官 Brian Holz: http://www.spacenews.com/article ... ctrum-for-satellite


本帖被以下淘专辑推荐:

纸飞机 发表于 2014-6-2 18:14 | 显示全部楼层
这个业务是针对个人的还是宽带供应商的?
 楼主| gnss 发表于 2014-6-2 18:49 | 显示全部楼层
纸飞机 发表于 2014-6-2 18:14
这个业务是针对个人的还是宽带供应商的?

个人的,针对ISP的,已经有O3b了,google也在那投了很多钱
嘉欣 发表于 2014-6-3 20:49 | 显示全部楼层
请问这个星座能覆盖到室内上网么?
是不是得拉一条天线到室外。
网速如何?
cmj9808 发表于 2014-6-4 16:43 | 显示全部楼层
18条轨道至少需要18发Falcon 9,这无疑又将是一次SpX的盛宴
飞豚王 发表于 2014-6-4 17:59 | 显示全部楼层
这是第二个铱星了吧。。。
liao68811 发表于 2014-6-4 18:07 | 显示全部楼层
飞豚王 发表于 2014-6-4 17:59
这是第二个铱星了吧。。。

应该技术水平比铱星高。
纸飞机 发表于 2014-6-5 08:39 | 显示全部楼层
得,这样是不是GFW就彻底没效果了……
璇瑢子 发表于 2014-6-7 10:37 | 显示全部楼层
纸飞机 发表于 2014-6-5 08:39
得,这样是不是GFW就彻底没效果了……

干扰敌台
 楼主| gnss 发表于 2014-6-17 05:02 | 显示全部楼层
本帖最后由 gnss 于 2014-6-17 05:04 编辑

NSR Analysis—Will Google be the New Big “G” in the Satellite Industry?

Much has been said in the past few days since news of Google’s interests in providing satellite Internet became public.
At NSR, having seen one constellation too many go “down” before going “up.” we like to remain cautiously optimistic about such plans. Although admittedly, the signs have us leaning more towards optimism than caution this time around.
“Google’s mission is to organize the world’s information and make it universally accessible and useful.” [Source: http://www.google.com/about/] The key words here being accessible and universally. Furthermore, five out of Google’s Ten Things philosophy are quoted as-is below:
  • “Focus on the user and all else will follow
  • It’s best to do one thing really, really well
  • Fast is better than slow
  • You don’t need to be at your desk to need an answer
  • The need for information crosses all borders” – [Source:http://www.google.com/about/company/philosophy/]
It does seem that a service for providing Internet access that is fast, universal, accessible and across borders, needs an answer that involves satellites, drones, balloons or all of the above.
That’s fine for philosophy. What about the Numbers?

                               
登录/注册后可看大图

Approximately ~5 Billion of these have one or more Mobile Phones. What could Google possibly do here? Build Android, Check! Did it work? At almost 1 Billion people using Android in 2014, only six years after Android first launched, it seems to be working just fine. Staggering, actually.
Equally staggering is the fact that ~1.2 Billion people worldwide are Unique Google Users, i.e., warm bodies who use the Google search service monthly. Yes, monthly! Some might be equally surprised that there is still a percentage that does not use Google.
The exhibit to the left gives a different view altogether. ~5 Billion of people have no access to the Internet. A surprising number when you think how frustrating it gets when you don’t have WiFi coverage at home or 3G / 4G on the go. So how does Google get to the other “unconnected” 5 Billion if they don’t even have Internet access? Wait for the telecom behemoths of the respective countries in Africa, India, China, Rest-of-Asia and Latin America etc. or Do-It-Yourself?
Many of them exclusively access the Internet from mobile phones. Should Google invest in 3G / 4G in the above countries as well? No need, really. It would be easier to let the likes of Vodafone, Zain and China Unicom build their cellular tower networks themselves. Piggy-back by giving “Free” access to the public for Google-only services on cellphones and you’ve got an ever-increasing mobile phone population “Googling” for information
Now for the Caution

                               
登录/注册后可看大图

History, however, has not quite favored satellite-based constellations, particularly in LEO, for providing data connectivity across the globe. The table to the left covers just a few known names, some live, some not-so-much. Almost all systems had big names backing them when they started. Very few have actually met expectations.
There were many reasons these systems saw failure beyond what they had anticipated. The dot-com bust of 2000 was one, poor planning against GSM roaming usage was another. Use cases not holding up in terms of personal telephony and/or enterprise usage of satellite-based systems was an important one as well. Has the data consumption environment changed, now that so many people want so much high-speed data on all their devices, all the time? Surely. Have satellites also evolved in terms of multi-spot-beam, frequency reuse giving Gigabits of throughput? Definitely. Is a HTS satellite based constellation the answer to this problem? It might just be.
Why Only Satellite Then?
Google Fiber may be lightning fast access but is painfully slow to build. The offering launched to the public in 2011, work for which probably started in 2009-10. By the end of 2013 there were only Kansas, Provo and now possibly Austin ready to sell? A “measly” one city per year! The now-planned 34 cities may not take three decades, but will still take time even if efforts and resources were multiplied significantly. Laying fiber, or even leasing it to build a consumer ISP network is a slow and painful affair summed up in three words - Right of Way.
If Google would have launched an HTS GEO satellite (pure speculation), all of North America would have been covered in 3 to 4 years from start to finish. Every major continent in 5, if Intelsat Epic’s plans are to be believed. The best part—satellite based Internet access systems are already live, unlike those from drones and balloons. ViaSat’s Exede, for example, claims speeds of 12Mbps to the end user. It also offers “Unlimited Access” for $64.99 per month. Gigabit Internet from Google Fiber retails at $70 per month in Kansas.
What Are The Correct Ingredients To Make This Fly?
At the drawing board, the parameters are finite. In space, there are Orbit & Frequency that decide Number of Satellites & Antennas and finally affect Latency & Coverage. LEO ensures minimum latency but needs more satellites and fancy antennas. MEO reduces satellites but increases latency and radiation hardening and still needs cumbersome antennas. GEO is too crowded, high latency and ubiquitous coverage in any frequency band is not easy to get. On the ground, people consume the Internet either at home or (increasingly) on-the-go. Handsets have 3G / 4G and WiFi as radios with the latter being more ubiquitous and less regulated.
The rumor “fuel” of Google’s impending acquisition, the “spice” from recent hires and a dash of speculation point at LEO, Ku-band, HTS with small satellites that are easy to replace. The last mile could be cellular 3G/4G, which would mean Google’s system becomes backhaul like another O3b. Unlikely. Alternatively, a fancy “Kymeta-like” antenna system could make it easier to connect Points-of-Presence on the ground, with final delivery over Wi-Fi. Tough to deploy. Anything that requires an additional radio in today’s fragmented “mobile” handset market would see slow take-up. Anything that caters only to “fixed” homes via a conventional dish will hit a glass ceiling that the ViaSat’s and Hughes’ of the world will likely experience in the near future.
It is obvious that the right answer is not simple, even though the final product needs to be... just that. Especially if it has to provide even “3G-like speeds” to the remote villages of India, China or Africa. Any combination of the above ingredients requires significant investment, and here is where Google’s ad-driven pockets come handy.
NSR’s Bottom Line
Google today can afford to invest in any and every technology, market and business plan that helps more people access the Internet farther and faster. The finer print there is that the majority of people going online are using Google’s search and apps services. The ads generated therein will end up paying for all such systems and will still leave cash to spare. NSR believes that given a couple of years, there will in all probability be a satellite / drone / balloon version of Google’s ISP plans. Our collective “gut” says HTS satellites in LEO will be the “killer” combination, but the lack of past precedence warrants caution.
...
http://www.satnews.com/story.php?number=1875379986


tq01wnf 发表于 2014-7-11 07:05 | 显示全部楼层
google 本来就是o3b的股东啊?      估计是觉得掣肘太多,决定单干了?  、

O3b Networks' investors are SES, Google, Liberty Global, HSBC Principal Investments, Northbridge Venture Partners, Allen & Company, Development Bank of Southern Africa, Sofina, Satya Capital and Luxempart.  
http://www.o3bnetworks.com/media-centre/faqs


但是看新闻,google移动卫星宽带项目的卫星还是由o3b提供。 卫星由O3B提供, 重约250磅,113公斤的小卫星。  
cmj9808 发表于 2014-9-4 23:24 | 显示全部楼层
该项目总监Greg Wyler和首席技术官Brian Holz均已终止与google的合作关系,由于频率是Greg Wyler所在的WorldVu Satellites Ltd申请的,这个项目很可能不再由google掌控了。

http://www.parabolicarc.com/2014/09/03/google/
cmj9808 发表于 2014-11-9 13:05 | 显示全部楼层
本帖最后由 cmj9808 于 2014-11-9 13:07 编辑

华尔街日报消息,Greg Wyler离开Google以后和Musk碰到了一起,星座规模也扩大到700颗。从华尔街日报最近的爆料准确性看应该不是空穴来风,不过Musk在其中的作用究竟是仅提供发射服务还是如文中所说要大举进军卫星制造业仍是未知数。
In talks with industry executives, Messrs. Musk and Wyler have discussed launching around 700 satellites, each weighing less than 250 pounds, the people said. That is about half the size of the smallest communications satellites now in commercial use. The satellite constellation would be 10 times the size of the largest current fleet, managed by Iridium Communications Inc...
Messrs. Musk and Wyler are considering building a factory to make satellites, the people said. One of the people said initial talks have been held with state officials in Florida and Colorado about locating the factory.

http://online.wsj.com/articles/e ... tellites-1415390062
无论如何,标题要改一下了。
cmj9808 发表于 2014-11-11 12:20 | 显示全部楼层
cmj9808 发表于 2014-11-9 13:05
华尔街日报消息,Greg Wyler离开Google以后和Musk碰到了一起,星座规模也扩大到700颗。从华尔街日报最近的 ...

不得不说华尔街日报真是消息灵通,Musk果真要接过Google的枪,全球免费wifi的时代还有多远?
@elonmusk: SpaceX is still in the early stages of developing advanced micro-satellites operating in large formations. Announcement in 2 to 3 months.


https://twitter.com/elonmusk/status/531994668608024576
kwah 发表于 2014-11-11 20:34 | 显示全部楼层

马斯克计划发射700颗卫星:向全球提供上网服务

本帖最后由 kwah 于 2014-11-11 20:48 编辑

马斯克计划发射700颗卫星:向全球提供上网服务
http://tech.sina.com.cn/t/2014-11-10/08229776270.shtml

新浪科技讯 北京时间11月10日早间消息,亿万富翁创业者伊隆·马斯克(Elon Musk)已凭借电动汽车和廉价的运载火箭变革了汽车和航天产业。消息人士称,目前他又开始专注于卫星,尝试通过小尺寸的廉价卫星向全球偏远地区提供互联网接入服务。
  消息人士表示,马斯克正在与卫星行业资深人士、谷歌(547.49, 6.48, 1.20%)前高管格雷格·维勒(Greg Wyler)合作。维勒创立了WorldVu卫星公司,并控制了很大一部分射频频谱。
  根据消息人士的说法,在与业内人士的讨论中,马斯克和维勒计划发射约700颗卫星,每一颗重量约为250磅(约合113.4千克)。这样的卫星尺寸为当前最小的商用通信卫星的一半。而这一卫星群的规模则达到了当前最大的卫星群,即“铱星”系统的10倍。
  毫无疑问,这一计划将面临财务、技术和监管方面的障碍,业内人士估计,开发这样的项目需要超过10亿美元的资金。消息人士表示,目前这一项目仍处于“成型阶段”,不能确定马斯克最终是否会参与。此外,马斯克和维勒也在考虑建设工厂,生产这些卫星。他们已经与佛罗里达州和科罗拉多州官员就工厂选址问题进行了讨论。
  消息人士表示,除了马斯克之外,WorldVu也在寻求与卫星产业的其他公司合作,为项目带来更多的专业性。
  马斯克旗下的SpaceX很可能将负责发射这些卫星,不过各方尚未达成任何协议。过去5年中,SpaceX已经发射了十余次Falcon 9火箭,并计划在2018年之前再进行数十次发射。今年9月,该公司赢得了美国宇航局(NASA)价值26亿美元的合同,以开发、测试及发射“太空出租车”,将美国宇航员送上太空轨道。
  建设工厂、测试卫星将是一个漫长的过程,而WorldVu需要明确对射频频谱的使用权。SpaceX或许要到2020年左右才能有足够的能力去发射这些卫星,届时WorldVu很可能会失去这些频谱。
  维勒此前创建的卫星互联网创业公司O3b Networks在发射最初4颗卫星时遇到了技术难题,这可能会导致卫星的使用寿命缩短。今天,O3b通过8颗卫星在赤道两侧覆盖了很大一部分地区,并计划在今年底之前再发射4颗卫星。维勒已经从该公司离职,但仍是该公司的大股东。
  一些迹象表明,维勒的新项目或许将面临挑战。维勒曾在谷歌提出类似的计划,而谷歌也对解决这样的重大问题很感兴趣。不过,维勒仅在谷歌工作了不到一年时间,就转而与马斯克合作。
  两名消息人士表示,维勒与谷歌的关系转淡是由于,他并不能肯定,谷歌在卫星制造领域有着足够的专业性。而谷歌拒绝对此置评。
  如果马斯克和维勒选择合作制造卫星,那么他们也将面临其他小卫星公司的竞争。这些公司包括位于内华达州的Sierra Nevada和英国的Surrey卫星技术公司。

  马斯克和维勒希望能减小这些卫星的成本。WorldVu需要大量卫星,因此将成为大容量、低成本卫星公司的重要客户。通过简化设计,自主开发发动机和其他元件,马斯克已经改变了火箭发射市场的状况。
  目前,尺寸最小的通信卫星重量不到500磅(约合226.8千克),而价格为每颗数百万美元。消息人士称,WorldVu希望将小尺寸卫星的制造成本削减至不到100万美元。
  较高的成本和有限的用户导致此前的多个卫星互联网项目未能成功。1998年,铱星公司在启动9个月之后就提交了破产保护申请。该公司当时的服务价格为每部手机3000美元,而每分钟通话还需支付7美元。因此,这一服务并未吸引很多用户。铱星的竞争对手Globalstar则于2002年申请破产。这两家公司随后都成为了移动数据提供商。
  马斯克和维勒或许可以在科技巨头中找到有意愿的投资者。谷歌和Facebook等公司正在尝试通过无人机和高空气球等技术向全球偏远地区提供互联网服务。(张帆)

kwah 发表于 2014-11-11 20:39 | 显示全部楼层
从技术的角度,大家看看靠谱不?

从通信卫星的角度,都是同步轨道,3.6万公里,这个用来给地面终端提供上网服务,地面的设备恐怕得非常大了;

如果用低轨,之前的铱星可以参考,700公里的高度,但是还是不能在室内使用,而且传输速率相当低,“数据速率只能2.4kb/s,实际传信率每秒500比特撑死了。”完全不够用啊;

如果再低,比如使用侦查卫星的轨道,200公里;但是还是有问题,200公里的轨道高度,光维持轨道,就需要大量燃料,卫星小了的话寿命很快就到了;
而且即使是200公里,能否给地面提供足够的速率,是否可以在室内使用,终端的体积和重量是否够大?

抛砖引玉,大家讨论下。
poweru235 发表于 2014-11-11 22:34 | 显示全部楼层
国内竞争估计是信威 不知道灵巧离实用还有多远 "太空巴士"反正是准备就位了
cmj9808 发表于 2014-11-11 23:07 | 显示全部楼层
kwah 发表于 2014-11-11 20:39
从技术的角度,大家看看靠谱不?

从通信卫星的角度,都是同步轨道,3.6万公里,这个用来给地面终端提供 ...

合并主题,你需要的信息在这个帖子里都能找到
cmj9808 发表于 2014-11-12 12:39 | 显示全部楼层
WorldVu发布了RFP,125kg*640颗卫星,1200km轨道,14Gbps流量。

http://www.spacenews.com/article ... ion-wants-to-co-own
回复 支持 0 反对 1

使用道具 举报

头像被屏蔽
liyue 发表于 2014-11-12 18:33 | 显示全部楼层
提示: 作者被禁止或删除 内容自动屏蔽
您需要登录后才可以回帖 登录 | 注册会员

本版积分规则

QQ|小黑屋|航空航天港 ( 豫ICP备12024513号-1 )

GMT+8, 2019-7-18 09:05 , Processed in 0.390000 second(s), 27 queries , Gzip On.

技术支持:飞腾网络

© 2001-2018

豫公网安备 41019702002513号

快速回复 返回顶部 返回列表