I built a mmWave material classification radar

amirhirsch 38 minutes ago | parent | next [-]

Very cool! Six years ago I worked on a mmWave (76-81GHz) imaging radar with a Rotman lens Tx and Rx. Designed as a LiDAR replacement, but we could see pipes in walls, or detect concealed weapons at ~1km.

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mlmonkey 6 minutes ago | parent | next [-]

Do you have a writeup about the project? I'd love to read more about it.

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GL26 33 minutes ago | parent | prev [-]

How many tx and rx antennas did you have ? (I don’t know if it was clear, my stack was 57-64 GHz, 2TX , 3RX)

	▲	amirhirsch 11 minutes ago \| parent [-]
		32 port Tx (vertical pancake beams) x 16 port Rx (horizontal pancake), something like 60 by 30 degrees. the entire thing used FPGA transceivers as one-bit DAC/ADC, Complementary Golay Code waveforms with one-bit correlation in the FPGAs (two VCU128s) -- digital logic was essentially the same as a binarized neural network, I squeezed a ton of popcnt performance out of those chips using both DSPs and LUTs

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tim-tday 31 minutes ago | parent | prev | next [-]

So thankful the author posted this. We often learn more from failure than success. Learning from the failures of others is how we can move forward. The lessons learned at the bottom of the article are gold.

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marking-time 13 minutes ago | parent | prev | next [-]

Terrific project!

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arikrahman an hour ago | parent | prev [-]

That's awesome. I built one for a capstone back in the day and know how tough it is to get onboarded. Kudos.