You know who could use some good news right about now? Phil Falcone. You know what doesn’t constitute good news? This crap:
Philip Falcone’s proposed LightSquared Inc. wireless service caused interference to 75 percent of global-positioning system receivers examined in a U.S. government test, according to a draft summary of results. The results from testing conducted Oct. 31 to Nov. 4 show that “millions of fielded GPS units are not compatible” with the planned nationwide wholesale service, according to the draft seen by Bloomberg News. “LightSquared signals caused harmful interference to majority of GPS receivers tested,” according to the draft prepared for a meeting next week of U.S. officials reviewing the LightSquared proposal. “No additional testing is required to confirm harmful interference exists.”
Falcone’s LightSquared Said to Disrupt 75% of GPS in Tests [Bloomberg]
Related: So Harbinger-Backed LightSquared Might Kill Some People, So What?
In a statement issued today, White House Press Secretary said the failing of communication with the drone that landed in Iran was neither the work of Iran nor the USA but a douchebag with a excessively declining bank account and high hopes for a horrible wireless service.
My next job needs to be running a hedge fund. You can tell your clients you are blowing their money on bad investments and still be in business.
-J Corzine
Peptalk to Falcones:
Where do you think you're going? Nobody's leaving. Nobody's walking out on this fun, old-fashioned family Christmas. No, no. We're all in this together. This is a full-blown, four-alarm holiday emergency here. We're gonna press on, and we're gonna have the hap, hap, happiest Christmas since Bing Crosby tap-danced with Danny fucking Kaye. And when Santa squeezes his fat white ass down that chimney tonight, he's gonna find the jolliest bunch of assholes this side of the nuthouse.
In space, no one can hear you scream for your money back.
Chances the US redeems the drone from Iran > Chances Wilbur's Fan Club redeems anything more than heart warming memories of his piano recitals
Chances of the US getting the drone back from Iran > Chances of anyone finding the missing MF Global money
lets get some nice pictures of Lisa Marie up. I'm feeling frisky.
So this hedge fund guy and a pig and a woman in a Greek warrior's uniform made out of trashbags walk in and say they have a device that will change broadband forever with unimaginable applications to connect people globally. I'm really pumped about this but I need some educated opinions. I'm going to check with my friends at Goldman Sachs and if this thing checks out there's no way it's leaving my shop!
-Rick Harrison
Pawn Stars
Las Vegas, NV
Wait, somebody in the U.S. invented a device that can be mass-produced and which can shut down GPS systems – like the ones being implemented by the U.S. military – with ease? You know, my job just got a whole lot easier all of a sudden.
- People's Liberation Army of China Electronic Warfare Quant
Now all you have to do is come steal it from us! Don't worry, we'll look the other way like always.
- every US intelligence agency
BIG BROTHER IS'NT* WATCHING YOU
- Phil Falcone
Falcones’ real plan
(1) Get into car
(2) Turn on GPS and follow course
(3) End up god-knows-where
(4) Discover Corzine’s treasure chest of “lost” funds
(5) Profit
Fuck! I knew I should have traded this in for gum.
-LP with plenty of TP for sale
I'll bet a few autographed Koho's got broken this am.
Oh, you're supposed to blow money? Apparently I've been doing it wrong.
—LT
We see no problem with this.
-American Association of Sextant and Compass Manufacturers
Bummer, I just bought this Garmin device for Lisa for Christmas!
- Wilbur
Don't worry, President Downgrade will buy the technology for $5bn shortly before LightSquared files for BK.
PF: Grab Wilbur, make sure the Sprinter van is full of gas, pick up some maps of Mexico–the paper ones, and meet me at the office.
LMF: Ok, Pheel.
My FleshlightSquared is filled with liquid.
-Gundlach
Wait, wait, wait… So you're saying I'm not getting the 2012 Lanvin trash bag!
- L. Falcone
Jon,
Let's get together for lunch and talk. I could use a partner.
J Meriwether
So Falcone has a $4B death ray?
Weak.
So this hedge fund guy and a pig and a woman in a Greek warrior's uniform made out of trashbags walk in and say they have a device that will change broadband forever with unimaginable applications to connect people globally. I'm really pumped about this but I need some educated opinions. I'm going to check with my friends at Goldman Sachs and if this thing checks out there's no way it's leaving my shop!
The times they are a changin'.
So you've got a device to change the broadband world? Let me check this out…..
-Rick Harrison
Pawn Stars
Las Vegas, NV
uh oh…
-nervous reader eying his watch, looking at the cumulative posts today, and knowing that Levine's daily magnum-opus is due in short order.
We stand behind you in solidarity!
Wheelwright Local #467
Hey – leave me out of this please.
In Soviet Russia, money blows you.
But true.
LightSquared, or any competitor using near frequency strong terrestrial transmission, will produce an off-band signal that will be received by the GPS receiver because of the bandwidth of the GPS receiver "patch" antenna. This is called "quality factor" or "Q" and is a measure of center frequency divided by 3db bandwidth. Unfortunately, GPS uses a high frequency, and Q diminishes with frequency (why radios and TVs all use a lower frequency IF stage, to get better transmitter station selectivity, and do not count on the antenna or RF stage for much help there).
GPS receivers can use a DSP computer to, and we will use the analogy of a noise canceling headset, make an interference signal "anti-noise" to add into the desired signal with noise, to remove the noise from the desired signal. Unfortunately, the signal must also be heard in the signal plus noise coming from the antenna to the DSP computer input.
Design assumption: the filter between the patch antenna and the first LNA RF amplifier inside the GPS antenna must reduce the interference signal amplitude down to equal to or lesser than the desired GPS signal before the DSP computer can be effective at eliminating the noise.
If you have zero loss at the GPS bandpass, how much LightSquared signal attenuation do you need over the entire noise spectrum bandpass? Let's do a "back of the envelope" engineering guesstimate:
You need to reduce the power spectral density of the noise to or below the power spectral density of the signal. Power spectral density is measured in watts per square foot.
Watts (the undesired is stronger, goes proportionally):
db = 10 log Pi/Pr
How much does LightSquared transmit – don't know, keeps changing.
How much is the effective radiated power of a GPS satellite – there is a spec for that.
db = 10 log 15,750/300
db = 17.2
Square Feet (the undesired is closer, goes inverse square proportionally):
db = 10 log Rr**2/Ri**2
How far away is LightSquared – assume 1000 feet
How far away is a GPS satellite – assume 11,000 miles x 5,280 feet per mile
Surface of a sphere is 4 x Pi x radius squared
The 4 and the Pi factor out
db = 10 log (11,000 x 5,280)**2 / 1,000,000
db = 95.3
Attenuation required = 17.2 + 95.3 = 112.5db
If you have zero loss at the GPS bandpass, how much LightSquared signal attenuation do you need over the entire noise spectrum bandpass? Let's do this another way, using "the other side of the envelope" engineering numbers:
http://gpsinformation.net/main/gpspower.htm http://www.glonass-center.ru/en/GPS/ http://www.raimprediction.net/ac90-100/summaries….
GPS is at around -130dBm on the ground.
LightSquared's lower, re-re-revised (they're going to turn it way up later, they admit) power level is -30dBm "near" their tower. Don't expect a definition of "near", and keep in mind that LightSquare keeps changing numbers.
Attenuation required = -30dbm – (-130dbm) = 100db
But what does this mean:
db is a log scale so 10db is a factor of 10, 20db is 100, 30db is 1000, 40db is 10,000, 50db is 100,000…
100db is, everybody get, 10**10 = LightSquared 10,000,000,000 times stronger than GPS
112.5db is, everybody get, 10**11.25 = LightSquared 177,827,941,000 times stronger than GPS
Really really really really big! Somehow, LightSquared accusing the PNT committee of being off by 32 times doesn't seem like much (only 15db)!
You can adjust the number down as LightSquared offers new lower power limits, and up as they increase the power as they claim they will. And you can adjust the number up as you decide on lower effective range limits (how far from the LightSquared tower your GPS should not work). You get the idea how this is done.
Hint, the antenna design will buy you something, which is not accounted for here, but not that much.
Hint, the DSP ability might be better than assumed, and this is the dimension where discovery and invention might make things considerably eventually better far in the future.
Hint, the configuration might be changed to allow multiple lesser attenuation filters in series, perhaps separated by amplifiers, but no amplifier can be allowed to saturate from the off-band interference signal, and "sneak paths" for the strong interference signal around filter segments, such as in the power circuitry for the amplifiers, or the printed circuit board dielectric, will easily destroy this topology option.
Anyway you approach the problem of separating a small signal, like a flashlight on the moon, from a large signal, like a nuclear bomb detonation from 1000 feet away, you are going to have a big engineering challenge ahead of you. Good luck, because we need a PNT system, and Loran has been terminated.
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