You're looking at the Japanese H-IIA Launch Vehicle pushing the ALOS (Advanced Land Observing Satellite) satellite into orbit from the Tanegashima Space Center early this morning. It contains several sensors, but especially noteworthy is the PALSAR (Phased Array type L-band Synthetic Aperture Radar) instrument. This is the first commercial fully-polarimetric spaceborne SAR ever to be seen. It can see through clouds during both night and day operations. It operates in L-band, which means it can see through trees.
What does this mean to me, you ask. It means that we now have a cost-effective means for monitoring terrorists and enemies operating under the trees or at night for the first time. If the Japanese are kind enough to allow us the use of their shiny new toy.
Originally designed to be launched in 2002, more can be found here, in Japanese here, and in Eurospeak here.
Note on politics. You'll notice that there's a paucity of information on this in the American press, and no news about it coming out of NASA. That's because the Japanese have taken the lead while the Americans are sitting on their duffs. But don't worry. We'll build better cars instead. Not. So we'll build bullet trains. Er, that would be the Europeans and Chinese.
The Germans are scheduled to launch a similar satellite this year, followed by the Canadians. Yes, even the Canadians are putting us to technological shame these days. No similar American satellite is even contemplated at this point. We'll be relying completely on these three allies for our monitoring needs. I guess we'll want to maintain good relations. So sit back, open a beer, and enjoy a toast to
14 comments:
Well, the Japanese are our allies at this point. And I suspect that the telemetry from these satellites can be captured other than just getting a feed from whoever put it up there.
Further, I think you make too facile a case for actually identifying stuff on the ground.
I've been wondering if orbital SAR could help locate weapons caches. ISTR that some of the SAR images obtained by the shuttle missions showed the rock underlying desert sands in such places as Egypt and Yemen. So is seems that SAR should be able to penetrate the ground sufficiently to turn up metal objects such a shells and morter rounds.
Getting the needed downlink bandwidth to transfer all that information to the ground could be interesting. I wonder how much data the Japanese SAR is collecting?
Is the resolution really that high?
Ain't technology incredible? Maybe we can buy some time to look for the brains of the democratic party?
THe rocket looks like a Titan-Centaur.
Is the resolution really that high?
Here is a link to the NASA SIR-C/X-SAR instrument flown in 1994. The wavelengths are:
L- band = 23.5 cm
C- band = 5.8 cm
X- band = 3.1 cm
So the limitations are likely to be the timing accuracy, the pulse shaping, bandwidth, and s/n -- radar returns fall off as 1/r**4 and so antenna gain is likely to be a limiting factor. There have been big advances in synthetic pulse generation and phased arrays. My dad, happily working at the cutting edge at age 86, has done a lot of the pulse synthesis work at Lincoln Labs.
I have always assumed that we have classified SAR radar in orbit. I sure hope that is the case. Also note the involvement of Ball Aerospace in the NASA instrument %^)
Eric, I could make a better case, probably much better than you can imagine, trust me on this, but I feel that a public web site is not the place, if you know what I mean.
Seneca, The German and Canadian satellites will have 1m resolution. We'll be able to get plenty from ALOS in the meantime. The key phrase here is "fully-polarimetric".
Chuck, Yes, I think you're right. But for ground penetration we need the long wavelengths. As for classified SAR, well, I've heard rumors but I wouldn't know anything about that. Lest we become too complacent, though, the important phrase here is "cost-effective". Trust me, large swaths of the US government will be relying on ALOS and the other satellites when they are launched.
They can see your toes
Through your socks and socks and shoes
The Japanese can
They can see me now
Through the roof of my homestead
But why would they want?
Building nukes indoors
PALSAR casts its sickly light
Can't they see I'm Il?
Roger, Roger,
Calling the outcome of a game--that's one thing. But putting your good name on the line for an exact point spread? I dunno....
An eye in the sky came to life
Its gaze cut through clouds like a knife
So Jim shouted skyward
(That's more or less eye-ward)
"You'd better not look at my wife!"
It's all downhill from here.
All night Jim lay restless in bed
Afraid they could see in his head
"We can't let that happ'n!"
He threw off his cap 'n
Then covered his noggin in lead.
I guess it can see through tinfoil then!
And the crazies thought 'illegal domestic wiretapping surveillance' was bad!
And those crazies can't even escape to Canada anymore!
Hey, we always aim for more transparency. Now we've got it, and the trees and rocks and houses too!
The only thing I fear is that the gubmint will now know what I had for dinner. Let the war on jelly donuts commence!
Jellies in bellies
Churning for all to see them
Seven bucks a peep
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