DEFCON 19: Build your own Synthetic Aperture Radar 

Too bad he wasn't a captain for an airline. "Ladies and gentlemen we're flying through some thick clouds, that's why you can't see shit out there."

Comedic Sketches BLEEPIN FIREMAN YES! I'd be highly Interested as well! I've made waveguides fer magnetrons b4... and putz with sum other implementations of the Tech. But srsly, I'd luv some details.. I really want to try it andim So out of practice these days..

+BLEEPIN FIREMAN Glad I'm not your neighbour... ...Or *are* I? :-/

Bleepin Fireman hey you a hashers man think we met once at pbh3

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I wouldn’t do that nowadays, you would probably blow up every WiFi Router and smartphone within a hundred meters

yes.

77GHz, off the shelf now. But we have 120 and 240GHz.

Can you translate that to caveman for me

@@limabravo6065The higher the frequency (i.e. shorter the wavelength) the greater the capacity to detect a phase shift given all else is the same

You mean FuG 200 „Hohentwiel“ ?

Did you manage to create anything yet? Or is it still on the ideas bench? :)

@@mor4y Not yet, partly waiting for my wife to finish college, free's up my income and adds hers and will let me have free time to do research into the Freya radar. Part 2, Not a ton of good sources out there for technical information, I'm going to have to do some travelling to get a good understanding of how it works.

Maybe its a bit late, but one of the resources cited in the video is the Open MIT Course on radar, this is the link: ocw.mit.edu/resources/res-ll-003-build-a-small-radar-system-capable-of-sensing-range-doppler-and-synthetic-aperture-radar-imaging-january-iap-2011/index.htm

Well its been 6 years and I have good news. Many, many papers are public on the matter

@@MichaelOfRohan any links?

@@notaboutit3565 any microwave electronics for communication textbook. Harmonics and material deflection is a matter of trial, I suppose. RF is a magnificant starting point, without the ball cancer and mysterious sunbruns..

I’m sure they could, but their way is far more lucrative, especially with a “former” board member as a sitting SECDEF.

when a narcissist, self-appointed magician and shaman exhibits how much science he has swallowed and can defecate...

Really fuckin tiny

I was wondering if it could only detect a gps tracker for a car, If so then can the person in the car talk with the person at the radar screen, Now can it also work with multiple gps tracker that can talk with the person at the radar screen and can there be a way to have another person looking at a weather radar talk with the person in the car, Is there a way to have the gps tracker connected to a car gps that is bought separately from the car but to only send to the person looking at the radar screen the destination without getting ride of the route line when the car follows it if so then can the person looking at the weather radar receive it too, Is there anyway to increases it's range to infinite (if possible), and also for the gps tracker is there a way to give them names?

He will never answers to you...

A lot of things limit resolution, wavelength size, antenna size, distance (range) to what you're trying to look at etc...

It’s the same in the states

There were even experiments with ground radars (detecting underground objects) in VLF range, where lightnings were used as sources of electromagnetic pulse.

Mieszko Guliński Re P-18 stuff -- kind of, but not really. P-18 is a 2D search radar, not a FCR, and the S-125 (normally the P-18 is an SA-2 thing) doesn't use it to guide missiles; shooting something down still requires a track with the FCR, which is X-band. Stealth aircraft are optimized not against more common radars, but against the kind of radars that give tracks precise enough for weapon targeting (~X-band, NATO India band or so). This is really hard for other aircraft to work around because the antenna and power requirements for high resolution lower-wavelength radars are absolutely prohibitive and UHF search radars like the P-18 are physically gigantic (too large to fit on aircraft). Also, just because aircraft behave as Mie scatterers to them doesn't mean that they automatically have a larger RCS, and Zoltan Dani's testimony himself suggests that the F-117 has a very small RCS in the P-18's wavelength (as he first saw it at ~23km and managed to track it at ~18km). Low Blow/P-15 (and the SA-2's Spoon Rest/P-18) are of a low enough wavelength that you can operate it without fear of antiradiation missiles (you can't put antennas large enough to actually see the radar in them!), so he was able to radiate constantly. tl;dr: the P-18 is only good against stealth aircraft if one flies right on top of you, in which case you can use basically any other radar thanks to received power scaling exponentially with distance. low-frequency radar isn't much better against stealthy aircraft than conventional X-band radars found in fighters and missiles and it comes with a whole host of downsides.

Thanks for more detailed explanation :)

No problem! It's a fun topic, haha.

+Mieszko Guliński and you mentioned the f-117 shootdown, likely they were tracking the aircraft with the p18, and when he opened the bomb doors the guidence radar could see him, the weapon used was a s-125 sam system, guided by small radars like the p15, the sa-4 goa radar, prv 11, could get a positive lock on the f117 with its bomb bay exposed, resulting in the shootdown

Bc the FCC will come a'knocking

Ask Nikola Tesla, that would be an interesting conversation

@@imdifferentMr843 Are you going to recommend an actual academic next time or are you limited to lunatics?

What he described is how a superheterodynes mixer works in a simple to digest way...depending on if you use a sample from the output of the demodulator to feed an AFC that would control the Local Oscillator(FM) or if the sample was fed to the IF amps with an AGC to add amplitude to the signal(AM) the would determine if it was AM(Amplitude Modulation) or FM(Frequency Modulation)....and in this case the ramp generator varies the frequency not the amplitude. So I'm pretty certain it is in fact an FM device. Your home stereo uses a superheterodyne and mixes the modulating signal with the local Oscillator in the same way regardless of AM or FM setting, the changes occur after the mixer.

No he is an MIT student doing a presentation on one of his assignments that he is passionately interested in that can be cheaply reproduced with out an MIT degree!

oof cool guy alert

fuck you bro

It gets more techical at 20:30 but they're some interesting parts before, especially the fourrier transform