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How Passive Radar Works

https://www.passiveradar.com/how-passive-radar-works/
21•surprisetalk•1d ago

Comments

sebasv_•59m ago
I want this, but I do not have the experience with radio signals to build this myself without more guidance. Is there a DIY proof of concept I could lean on? How much more challenging will this be if you are in an area with overlapping FM signals from 2 transmitters sending the same signal?
quantum_state•50m ago
Would suggest to take a look at Jackson’s book on classical electrodynamics to get some intuition.
lormayna•29m ago
This is a very good point to start: https://www.rtl-sdr.com/tag/passive-radar/

If you have more than one receiver, the main issue is time sincronisation between the receivers.

Using the two transmitters will complicate things a lot

quantum_state•58m ago
If one visualizes the electromagnetic field in the environment, including all objects in it and any changes, one would naturally come across many applications in sensing the associated changes in the field. One classic example is the eavesdropping case at Moscow US embassy in the former Soviet Union.
Chrisszz•38m ago
a website for passive radars, cool xD

Filing the corners off my MacBooks

https://kentwalters.com/posts/corners/
945•normanvalentine•14h ago•452 comments

Optimal Strategy for Connect 4

https://2swap.github.io/WeakC4/explanation/
80•marvinborner•2d ago•11 comments

Starfling: A one-tap endless orbital slingshot game in a single HTML file

https://playstarfling.com
252•iceberger2001•2d ago•72 comments

1D Chess

https://rowan441.github.io/1dchess/chess.html
854•burnt-resistor•20h ago•147 comments

Show HN: Pardonned.com – A searchable database of US Pardons

54•vidluther•6h ago•13 comments

Volunteers turn a fan's recordings of 10K concerts into an online treasure trove

https://apnews.com/article/aadam-jacobs-collection-concerts-internet-archive-chicago-b1c9c4466a2d...
125•geox•3d ago•11 comments

Installing every* Firefox extension

https://jack.cab/blog/every-firefox-extension
446•RohanAdwankar•14h ago•62 comments

Chimpanzees in Uganda locked in eight-year 'civil war', say researchers

https://www.bbc.com/news/articles/cr71lkzv49po
350•neversaydie•17h ago•207 comments

Artemis II safely splashes down

https://www.cbsnews.com/live-updates/artemis-ii-splashdown-return/
984•areoform•12h ago•303 comments

AI assistance when contributing to the Linux kernel

https://github.com/torvalds/linux/blob/master/Documentation/process/coding-assistants.rst
360•hmokiguess•17h ago•263 comments

WireGuard makes new Windows release following Microsoft signing resolution

https://lists.zx2c4.com/pipermail/wireguard/2026-April/009561.html
495•zx2c4•20h ago•144 comments

Industrial design files for Keychron keyboards and mice

https://github.com/Keychron/Keychron-Keyboards-Hardware-Design
391•stingraycharles•20h ago•122 comments

Productive Procrastination

https://www.maxvanijsselmuiden.nl/blog/productive-procrastination/
45•maxvij•7h ago•18 comments

How Passive Radar Works

https://www.passiveradar.com/how-passive-radar-works/
21•surprisetalk•1d ago•5 comments

France's government is ditching Windows for Linux, says US tech a strategic risk

https://www.xda-developers.com/frances-government-ditching-windows-for-linux/
75•pabs3•4h ago•37 comments

CPU-Z and HWMonitor compromised

https://www.theregister.com/2026/04/10/cpuid_site_hijacked/
347•pashadee•22h ago•92 comments

Helium is hard to replace

https://www.construction-physics.com/p/helium-is-hard-to-replace
324•JumpCrisscross•21h ago•230 comments

JSON formatter Chrome plugin now closed and injecting adware

https://github.com/callumlocke/json-formatter
230•jkl5xx•17h ago•115 comments

Bevy game development tutorials and in-depth resources

https://taintedcoders.com/
92•GenericCanadian•2d ago•21 comments

Sybilproof reputation mechanisms (2005) [pdf]

https://dl.acm.org/doi/pdf/10.1145/1080192.1080202
11•perfmode•3d ago•0 comments

A practical guide for setting up Zettelkasten method in Obsidian

https://desktopcommander.app/blog/zettelkasten-obsidian/
60•rkrizanovskis•2d ago•33 comments

20 years on AWS and never not my job

https://www.daemonology.net/blog/2026-04-11-20-years-on-AWS-and-never-not-my-job.html
176•cperciva•6h ago•35 comments

Quien – A better WHOIS lookup tool

https://github.com/retlehs/quien/
52•bretthopper•8h ago•18 comments

Italo Calvino: A traveller in a world of uncertainty

https://www.historytoday.com/archive/portrait-author-historian/italo-calvino-traveller-world-unce...
92•lermontov•12h ago•16 comments

The Bra-and-Girdle Maker That Fashioned the Impossible for NASA

https://thereader.mitpress.mit.edu/the-bra-and-girdle-maker-that-fashioned-the-impossible-for-nasa/
101•sohkamyung•2d ago•5 comments

A New Way to Spray Paint Color

https://spectrum.ieee.org/spray-paint-color-creator
13•sohkamyung•1d ago•7 comments

Watgo – A WebAssembly Toolkit for Go

https://eli.thegreenplace.net/2026/watgo-a-webassembly-toolkit-for-go/
103•ibobev•17h ago•7 comments

Investigating Split Locks on x86-64

https://chipsandcheese.com/p/investigating-split-locks-on-x86
64•ingve•3d ago•22 comments

Launch HN: Twill.ai (YC S25) – Delegate to cloud agents, get back PRs

https://twill.ai
71•danoandco•20h ago•72 comments

Intel 486 CPU announced April 10, 1989

https://dfarq.homeip.net/intel-486-cpu-announced-april-10-1989/
172•jnord•1d ago•156 comments