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Cell Towers Can Double as Cheap Radar Systems for Ports and Harbors (2014)

(spectrum.ieee.org)
137 points transpute | 1 comments | 29 Jun 25 21:48 UTC | HN request time: 0.336s | source
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transpute ◴[29 Jun 25 23:52 UTC] No.44417727[source]▶
More coverage of RF sensing, including laptops/phones with radios+NPU to sense their human:

2025, "Espargos: ESP32-based WiFi sensing array", 30 comments, https://news.ycombinator.com/item?id=43079023

2024, "How Wi-Fi sensing became usable to track people's movements", https://www.technologyreview.com/2024/02/27/1088154/wifi-sen...

2023, "What Is mmWave Radar?: Everything You Need to Know About FMCW", 30 comments, https://news.ycombinator.com/item?id=35312351

2022, "mmWave radar, you won't see it coming", 180 comments, https://news.ycombinator.com/item?id=30172647

2021, "The next big Wi-Fi standard is for sensing, not communication", 200 comments, https://news.ycombinator.com/item?id=29901587

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Animats ◴[30 Jun 25 03:37 UTC] No.44419092[source]▶
Right. The longer range versions of multistatic radar are used to detect stealth aircraft.[1][2] All that careful stealth geometry to minimize direct reflections doesn't help much when the emitters and receivers are in different locations.

[1] https://www.presstv.ir/Detail/2024/11/18/737423/guardians-of...

[2] https://www.yiminzhang.com/pdf/radar13_passive.pdf

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Grayskull ◴[30 Jun 25 09:10 UTC] No.44421093[source]▶
Well, you don't even need a radar. Tamara sensor could detect B-2, when it had it's onboard radar on.

https://en.wikipedia.org/wiki/Tamara_passive_sensor

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1. wat10000 ◴[30 Jun 25 15:20 UTC] No.44424415[source]▶
I'm pretty sure that "don't operate your radar in enemy airspace" is right below "don't email your flight plan to the enemy" on the list of tips for stealth pilots who want to survive a mission.