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  • The LightSquared Debacle in Layman’s Terms

    Posted on October 13th, 2011 Lee Devlin 6 comments
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    I’ve been reading about the LightSquared debacle for months. My aviation-related sources have been covering the GPS industry’s objection to LightSquared and how it would be disastrous for the GPS receivers, essentially causing a loss of satellite lock or at minimum causing accuracy issues that could lead to disaster. The story received a boost in interest when it was found that there was some political chicanery associated with the White House administration pressuring a reversal in the testimony of an Air Force general. It’s hard to ferret out the underlying reason how this problem got this far, with so much money being invested in a technology that LightSquared should have known would hit a wall during its deployment, namely when it produced interference with a critical service like GPS that is adjacent to its bandwidth allocations. So I decided to do some research and summarize it here.

    The problem of radio interference isn’t new. The FCC and similar organizations in other countries were created primarily to help prevent interference problems by licensing radio spectrum and settling disputes among the radio spectrum’s users. All radio transmitters generate some amount of radio frequency (RF) energy on adjacent bands. All receivers are influenced by signals that are in adjacent bands because there is no such thing as a perfect filter to ignore nearby signals. So one must ask the question, is this an interference problem on the part of LightSquared, or a susceptibility problem for the GPS manufacturers? And since there is no such thing as a perfect filtering technique, how much can it help to apply filters to GPS receivers? Can the problem be solved with a 5-cent change to GPS receivers as suggested by LightSquared, a solution promptly dismissed as absurd by the GPS industry? I can tell you one thing that does not work, and that is to expect an industry to accept a problem introduced by some third party AFTER its products have already shipped and are in the hands of its customers. Sure, you can ask for a change to future products, assuming the change actually produces the desired result and isn’t too costly, but if an industry is entrenched, and I think that after 2 decades of shipping millions of products, GPS can be categorized as such, you can’t expect them to accept a problem that wasn’t a problem until your service came along.

    Nor can you expect all existing customers to ‘upgrade’ their equipment just to solve some newly introduced interference issue. Yet this is apparently what LightSquared was expecting. And I find that attitude arrogant and ridiculous. Anyone whose money is invested in a technology that expected such a system to work should expect to see his investment lost by those who dismissed or talked around these issues when they were first brought up.

    One might tend to lay the blame on LightSquared and its naivete, but I think the FCC is just as culpable. The FCC needed to realize that any service that occupied frequencies adjacent to GPS must necessarily be compatible with it. GPS satellites transmit signals from a distance of about 12,500 miles above the earth. Because of this vast distance, the signals are at a very low level once they arrive on earth, about -130 dBm (which is about 180 x 10^^-18 Watts). The land-based LightSquared 4G transmitters can use as much as 70 dBm (10,000 Watts). So you can see that there is a vast difference of roughly 2 x 10^^20 in signal strength between the two services. The low signal strength is one of the reasons why most Space-to-Earth signals require dishes or other types of high gain antennas pointed at the satellites to amplify only those signals and simultaneously ignore any signals originating from other directions. But GPS receivers cannot do that. First of all, the constellation of 24 satellites is in constant orbiting motion, and secondly, a GPS receiver needs an antenna that can receive from several satellites at once in order for it to do its job so it cannot use a directional antenna. A GPS receiver has none of the amplification and signal isolation benefits provided by a directional antenna. This means that the signals that a GPS receiver has to deal with are extremely weak, and are actually below the noise floor, and must be dug out of this noise floor using sophisticated signal processing techniques.

    GPS and LightSquared satellite allocations

    As shown in the graphic above, (source) the bands adjacent to the GPS spectrum were intended to be used for similar purposes, that is to send signals from space to earth or earth to space, and based on what I’ve been reading about LightSquared, this was how they intended to use the spectrum initially. But most broadband solutions that depend on satellites are not very compelling due to the 44,000 mile round trip the signals they need to make to the geosynchronous satellites. This trip adds about a half second delay which is too high a latency to provide a satisfactory experience compared with terrestrial broadband solutions, especially with modern Internet applications some of which cannot tolerate that kind of latency. People tend to use satellite broadband only when there are no terrestrial broadband offerings in their area.

    In 2004, presumably to make its service more financially attractive, LightSquared’s predecessor lobbied for and received authorization by the FCC to deploy thousands of land-based transmitters in the same frequency range as their satellite-to-earth band. I think that this authorization from the FCC is where things went awry. LightSquared, when it was a space-based wireless service that could hypothetically offer 100% coverage over the U.S. had a formidable calling card, namely that it could provide mobile wireless service to previously under-served rural areas. Telling a government bureaucrat that you’re going to provide ‘service to rural and the under-served’ is tantamount to telling them you’re going to cure world hunger or help the blind to see. Everyone knows there is little or no profit in serving the under-served, it just makes for a good story to soften up government bureaucrats so they’ll grant you favors. Indeed, earlier this year, the FCC allowed LightSquared to offer devices with just the terrestrial capability, making them nothing more than just another mobile wireless provider, which might be viewed as a clever bait-and-switch maneuver since those devices would no longer have the large size and expense of a hybrid phone. This would allow them to rake in some real profits by taking business away from the incumbents of lucrative mobile wireless services rather than being just some quirky satellite phone and data service.

    So more than any other factor, it was the decision to take its space-based frequency allocation and have the FCC re-authorize it for terrestrial transmitters that made it incompatible with GPS receivers. Even a very low-power transmitter that is in close proximity to a receiver will have signal strength that is many orders of magnitude stronger than one that is located 22,000 miles away. But if you can influence politicians by explaining away the problem, and hoping that the GPS industry looks upon it as an opportunity to force their customers to purchase new receivers that deal with the interference, then it would be a win-win for all parties, except those who have to buy new GPS receivers, namely consumers, who have no lobbyists to protect them. But it appears that all the hand waving about potential technical solutions may not make the GPS interference problem go away. There may be no filtering technique available at any cost that would fix it and still allow a GPS receiver to maintain the accuracy customers rely on. And so, in order for a company and its investors to enrich themselves, they appear to have no qualms about completely destroying another much larger industry that provides an invaluable service to many sectors of the economy. Some might think of this as free market capitalism. I think of it as sociopathic behavior so extreme that it makes me ashamed for the company and the politicians who did the company’s bidding.

    I have to wonder whether it’s even possible to provide an economical hybrid mobile wireless device that can be used with geosynchronous satellites and land-based cells. Iridium provides mobile phone service based on satellites, although that service nearly went broke and was only revived when its multi-billion dollar investment in satellites was picked up for pennies on the dollar. But Iridium is a completely different technology since its satellites are in low earth orbit, just 485 miles above the earth, and so the distance is about 2% as far from the earth as a geosynchronous satellite thereby requiring much less power from the mobile device to establish a connection. But these phones and service are very expensive compared with standard mobile phones. The phones tend to be large and bulky and cost upward of $1200. The service is metered at $1.30/min or more in addition to a $50 monthly fee. Compared with standard mobile phones this would not be a competitive offering, so getting the go-ahead from the FCC to have terrestrial transmitters was a key win for LightSquared because a phone that communicated with geostationary satellites would be very large, power hungry, and costly.

    The amount of power and antenna you’d need to communicate with a geosynchronous satellite would be difficult to implement in a handheld device that fits in one’s pocket, if it could be done at all, unless they intended for it to go through some form of a roof-mounted gateway. But then it wouldn’t really a true hybrid mobile device as this service had been promoted. And you couldn’t use a satellite handset from inside a car or house without a roof-mounted antenna and transceiver due to blockage of the satellite signals, making the service appear like something that may feel like a throwback to 1980′s technology.

    Hughes has offered a satellite/terrestrial mobile phone solution called GMR1-3G for some time. The hardware looks like something you’d need if you were deployed to some remote corner of the earth. In fact, LightSquared initially had planned to use that service before switching to something called EGAL which stands for Earth Geostationary Air Link from Qualcomm. EGAL appears to be some new hypothetical hardware/service that has yet to be deployed. Interestingly, Qualcomm is the company that came up with the estimate of 5 cents for the filter that would fix the GPS issue.

    It is usually not a good sign when a company gathering large sums from investors is basing its future success on a yet-to-be proven technology while simultaneously ramrodding its agenda by forcing a government agency to grant approval and thumbing its nose at its spectrum neighbors. These folks need a wake-up call. Maybe the sound of a few billion dollars of their investment swirling around a drain will provide that wake up call for Lightsquared and its investors and anyone foolish enough to embark on a similar venture in the future.

    UPDATE (2011-11-11) If you would like to know more about the testing that was done that showed the significant interference on GPS receivers, the Coalition to Save our GPS has a complete list of test reports on their website. The summary is that during these tests, nearly all GPS devices tested couldn’t receive a signal when they were within a few miles from the tower, even though the LightSquared transmitter was operating at 10% of the power they would be permitted to use. In addition, LightSquared claimed that if they simply moved their signals to the first 10Mhz of their allocated bandwidth, then 99% of the GPS receivers would not have been affected, even though there is not a single shred of evidence from this test that would support that claim.

  • Commuting Like George Jetson

    Posted on June 22nd, 2011 Lee Devlin 7 comments
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    Jetsons flying car

    I knew from watching the cartoon, The Jetsons that when I grew up, commuting would be fun. Surely, by that time all the technology showcased on that cartoon would have arrived. But sadly, much of the Jetsons technology is still missing, especially the flying cars. But lately, I’ve been using George Jetson’s approach to commuting that has made a 108 mile round-trip commute that I do several times a week not just tolerable, but enjoyable.

    Here are a few rules I follow to make my commute more enjoyable:

    • Ignore roads, travel in a straight line.
    • Don’t take a route that has traffic lights, stop signs, or other commuters.
    • Travel at twice the maximum speed limit, say, 150 mph or so.
    • Stay 2000′ above other commuters.

    APRS Google Earth of k0lee

    APRS track of my commute from Greeley to Rocky Mountain Metro Airport


    APRS of K0LEE-7 beacon

    Note speed - 158 MPH

    I guess you can tell by the images that I’m talking about commuting using my airplane. This works for me because one of my consulting clients is based at an airport so I don’t need ground transportation after I arrive. One of my colleagues actually lives on an airport, so he has the benefit of commuting door-to-door using his airplane alone. I have to drive 10 miles to the local airport first before I can hop in the plane…. but if I could only figure out how to take off from my back yard….:-)

  • Bear Chews up Plane, Duct Tape to the Rescue

    Posted on January 6th, 2010 Lee Devlin No comments
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    I am amazed at the resourcefulness of Alaskans. During a private “fly-in” fishing excursion in the Alaskan wilderness, the chartered pilot and fishermen left a cooler and bait in the plane. And a bear smelled it. This is what he did to the plane, a Piper Super Cub.

    The pilot used his radio and had another pilot bring him 2 new tires, 3 cases of duct tape, and a supply of sheet plastic. He patched the plane together, and FLEW IT HOME!

    Click on any image below for a higher resolution version.

    bear damaged plane

    How would you like to come back from a day of fishing to find this?

    bear damaged plane

    The bear destroyed a plane… all for some bait fish…

    And a few tasty tires…

    duct tape repair on plane

    Looking good!

    plane duct tape repair job
    Good enough to fly…

    I like the way he ‘kept it legal’ with the tail number written by hand on the duct tape. You have to click on the image to get a bigger view and squint to see the tail number written over the duct tape, N9368D.

    Adaptive Interfaces

  • Barnstorming and other Adventures

    Posted on December 10th, 2009 Lee Devlin No comments
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    1929 Travel Air

    1929 Travel Air


    I once shared a hangar with this beautiful 1929 Travel Air. About 20 years ago I learned to fly at the New Garden Airport in southeastern PA. Shortly after getting my license, I purchased a 1961 Piper Colt. Not long after I purchased it, this amazing aircraft showed up in the adjacent hangar. The plane had been purchased by a young lady who quit a secure job and started a barnstorming business with a business partner giving rides in an open cockpit biplane. I was amazed to think that someone would leave a secure job and start a business like that. Later on when I was exposed to Richard Bach’s books I felt like his stories might have inspired the couple to throw caution to the wind and start that business.

     

    While reading the Slashdot feed yesterday I saw a reference to a site that was exposing the Internet get-rich-quick schemes that are so prevalent these days. The article referenced a website called undress4success.com. Despite the attention-getting title, I learned that it was dedicated to providing useful information to people who are working from home. It provides resources to help people who like the idea of a 2-second commute and the site’s owners regularly gave the low-down on scams that prey on those hoping to make a living working from home. The most recent article was related to the ‘Work for Google’ scams that are being actively pursued by Google’s legal team, since they are not endorsed or supported by Google. The scammers are just trying to profiteer from pretending to have an association with the Internet search giant.

    I like to expose scammers. Seeing unscrupulous charlatans abuse the goodwill and trust of others is just one of those behaviors that I can’t sit by and idly watch. Several of my most popular blog articles are related to exposing scams like the Amish Heat Surge miracle heater, the Arctic Cool Surge (yes, same company), and exposing the unworkable mathematics of all MLM schemes.

    biplane_ride_san_vicente

    I was reading through the website and I started to realize that the couple running it had a very familiar-sounding story. They mentioned that they had started a Barnstorming business in Pennsylvania in the early 1990′s, moved it to San Diego, and then grew it to 7 aircraft and 25 pilots before selling it and starting this new website and promoting their book entitled Undress for Success: The Naked Truth about Making Money at Home which is about how to work from home. It was Kate and Tom, the same couple I had met at New Garden Airport, all these years later! It’s certainly a very small world.

    I had been working on my own article about people who make money by selling others on the idea of how to make money on the Internet. The funny thing is that many of these sites are all writing about the same thing, which usually involves selling ‘secrets’ or starting an endless cycle of recruitment for information products. It sounds a lot like an abusive MLM business. The kingpins in the worst MLMs don’t actually make their money selling products, they make their money selling high-margin ‘educational materials’ and ‘tools’ to unsuspecting recruits month after month. This is precisely what these get rich quick membership sites (who generally want a direct line to make a monthly withdrawal from your bank account) are up to. When it’s all said and done, they sell you on a business that is nothing more than a recursive cycle for you to try to write and sell the same kind of information on the Internet. But who wants to buy from you when they can go right to the source, i.e., the guy holding up an image of his big earnings check on every one of his pages? They augment this income with a other questionable affiliates all who have something to sell you that sounds like it will teach you to get rich quick. Or, if not that, then information on how to get flat abs, or get ripped like Arnold Schwartzeneggar in 4 weeks.

    I just purchased the book based on the positive reviews I’ve read on Amazon. Websites that educate people on the perils of scams tend to restore my faith in humanity and I always feel good when I come across one.

    And if you can’t live without a ride in the vintage Travel Air, you can find it at Barnstorming Adventures (phone: 800-759-5667) located at Montgomery Field Airport in San Diego flying under the new ownership of another couple who no doubt purchased the business as an insurance policy… an insurance policy against a boring life. :-)

    Remember, if something sounds too good to be true, it probably is, and on the Internet, that goes double.