Peer-reviewed academic paper: Chinese naval vessels could penetrate military radar systems of the U.S. and its allies
https://www.naturalnews.com/2024-01-17-chinese-naval-vessels-penetrate-us-radar-systems.html
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It's called Passive Target Motion Analysis. We were doing it by hand on paper in the late 1970s. It solves the same problem as the Torpedo Data Computer did on US submarines in WW2.
The AN/SLQ-32v1 passive Electronic Warfare suite was doing this electronically, and automatically, when we had it installed in 1980.
This passive Chinese system is useless against ships in EMCON. EMCON is like airplane mode on your cell phone.
SpyNavy
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)