Doing well by doing good
Google wants to bring Internet connectivity to rural areas and developing nations and has a comprehensive effort under way to do so. They are experimenting with terrestrial and extra-terrestrial wireless technology. I will look at terrestrial wireless in a subsequent post -- this one focuses on extra-terrestrial technologies.
During the last couple decades, NGOs, governments and entrepreneurs have worked with four extra-terrestrial connectivity technologies:
|(See pictures at the end of this post)|
High altitude platforms (HAPs) are blimps, drones or balloons that hover or circulate in the stratosphere. They have cloudless access to solar energy and being above the weather helps with control, but their signals must travel through rain and clouds. They are the lowest flying technology, so packet latency is relatively small, but so is their "footprint" -- the area their signal covers on the ground.
The most visible HAP Internet effort has been that of Sanswire, which has run well-publicized tests for over a decade. Sanswire has gone through bankruptcy, announced projects in Latin America that never materialized and faced complaints by suppliers and employees, but they are still working on Internet connectivity.
Google has two HAP projects, Project Loon, using balloons and a drone project using technology from recently purchased Titan Aerospace. There have been reports of Google blimp trials, but I've not seen any details on those. Let me know if you have more information.
Most satellites -- like the Space Station and sensing satellites -- are in low Earth orbit (LEO). LEO satellites move relative to the ground, which means that either communication windows are intermittent or many satellites -- a "constellation" -- are needed to cover the planet.
The first LEO Internet project I know of was used for intermittent connectivity in Africa during the early 1990s. Shortly thereafter, a number of entrepreneurial LEO projects were announced. The most ambitious was Teledesic, which proposed Internet connectivity for the entire planet using a constellation of 288 satellites orbiting at 700 kilometers. Teledesic had high-profile backers like Bill Gates, Paul Allen and a Saudi prince, but the technology of the day was not up to the task and the company failed.
Today, the best-known LEO communication system is Iridium's satellite phone service, consisting of 66 LEO satellites. (Iridium was conceived by motorola as an Internet project, but was scaled back to telephony, went bankrupt and reemerged as a phone service).
This week, Google acquired Skybox Imaging, a company that has put a LEO satellite in a 600 kilometer orbit. The company was formed for data gathering, for example for providing real time video and images of traffic on roads, the sea and in the air, environmental monitoring, or map and earth imaging.
As we see in the following heat-map video from Skybox, satellite imaging proliferated rapidly between 1986 and 2012:
This sort of imagery has both economic and military value, so it will provide Google both revenue and expertise in the short run. Might they be planning to parlay that into a constellation of Skybox communication satellites -- Teledesic II with modern technology -- in the long run?
Medium Earth orbit (MEO) satellites are used for communication and navigation. Google recently announced a project with O3b Networks (other three billion). O3b currently has four satellites in 8,000 kilometer equatorial orbits and they plan to launch four more this year. They say those eight satellites will enable them to offer continuous service to all parts of the Earth within 45 degrees of the Equator.
The project with Google is headed by two O3b executives and they speak of spending billions dollars and putting at least 180 satellites in orbit. When they speak of 180 satellites, one wonders whether they are considering a LEO constellation.
Today's commercial satellite Internet connectivity is provided by geostationary satellites, which are positioned above the equator and remain stationary with respect to the surface of the earth since they orbit exactly once per day. Their orbit altitude enables multi-country footprints, but latency and launch costs are high.
Geostationary satellites have been used in rural areas and developing nations since the early days of the Internet, and the industry has remained viable as a result of technical progress in launch technology (public and private), antennas, solar power, radios and other electronics, as well as tuning of TCP/IP protocols to account for the 1/4 second latency due to the orbital altitude. (I've had surprisingly natural voice over IP conversations with people on geostationary satellite connections).
Have those technologies progressed to the point where HAPs and lower orbit satellites are now viable as well?
Google, along with Facebook, is a founding partner of Internet.org, which seeks "affordable internet access for the two thirds of the world not yet connected." Since the beginning years of the Internet, NGOs, government agencies and entrepreneurs has been working on the Grand Challenge of connectingdeveloping nations. They have not succeeded, but Google, with improved technology, deep pockets, a long-range viewpoint and economic motivation (ads) may be able to pull it off.
Finally, I cannot end this post without wondering whether Jeff Bezos, founder of Blue Origin, Elon Musk, founder of SpaceX, and Richard Brnason, founder of Virgin Galactic are eyeing those other three billion people.
There is a 99 comment discussion of this post on the Slashdot Web site.
|Teledesic animation showing a satellite|
constellation that would cover the planet.
|There has been significant technical progress in connectivity|
to geostationary satellites since this picture was taken in India.
|Figure from Arthur C. Clarke's article proposing|
geostationary satellites for world wide radio coverage
|Geostationary satellites have large footprints.|
|Titan Aerospace solar-poweed drone|
|O3b MEOs will cover the middle of the planet/|
|Does anyone know anything about this Google blimp? (Photoshopped?)|
|Project Loon balloon|
|Sandisk's latest HAP attempt|
|Airport example from Skybox Imaging (more cool videos here)|