Millennium 7 * HistoryTech

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In this channel we are going to cover military history and military technology in particular, with a heavy bias on aerospace, from slightly unusual point of views. We will try to stimulate your critical thinking and have some fun in the process.
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A word of caution: we are not associated in any way to the almost namesake channel Millennium 7 that you can find here. youtube.com/user/RawrKorea
We suggest you to visit it, it is an excellent channel with interesting content.
The similarity of names is totally fortuitous and doesn't imply any relationship.

Millennium 7 * HistoryTech

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Millennium 7 * HistoryTech

This is not aircraft, but I was very curious about the announcement of the discovery of enormous structures under the Khafre pyramid. There has been a lot of debate but I could listen to Armando Biondi, who invented the methodology, explaining it, and I am a bit less skeptical.

From what I understand this methodology uses the radar doppler shift to measure the vibration of the ground at a specific point.

This is the novelty.

From there, it is seismic tomography, a very well established technology used in underground prospections to build a 3D image of what is under the surface. SAR has nothing to do with what they do, but SAR raw data are publicly available and they allow for this type of analysis. My question then is: where these vibrations come from? In the paper they speak of a 12khz central frequency: what is generating it? The answer I would give myself, if I had to guess, is: road traffic and industrial activity. Isolating cameras or Hi-Fi speakers from constant floor vibrations is a known problem.

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