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Chinese defense researchers have reportedly achieved a significant advance in electronic warfare by modifying a commercially available spectrum analyzer to detect signals from U.S. low-probability-of-intercept radar (LPIR)—a core component of American stealth technology.
LPIR systems are engineered to operate with minimal signatures, making them extremely difficult to detect. These systems underpin a wide range of U.S. stealth assets, including the F-22 and F-35 fighter jets, B-2 bombers, stealth drones, and even naval and missile defense platforms. Their purpose is to enable detection and tracking without revealing their own presence, using techniques such as frequency hopping, noise-like waveforms, adaptive power control, and advanced signal processing.
The Chinese-developed device, which reports suggest could be based on a TFN RMT744A spectrum analyzer—typically used for civilian telecom diagnostics—has been modified to detect LPIR emissions and pinpoint their source within 10 to 13.5 millimeters, even under jamming conditions. The project was undertaken at the 38th Research Institute of the China Electronics Technology Group Corporation and cost roughly 500,000 yuan (around $68,600), according to Interesting Engineering.
While exact technical specifications remain classified, reports suggest the system may rely on a combination of high-resolution wideband reception, long-duration signal correlation, and possibly machine learning algorithms to overcome LPIR’s counter-detection methods. The implications are considerable: if validated, the tool could undermine the operational advantage provided by U.S. stealth platforms.
This development highlights how sophisticated capabilities can emerge from relatively low-cost, dual-use technologies. Repurposing off-the-shelf equipment into military-grade systems has the potential to reshape the electronic warfare landscape by making advanced detection capabilities more widely accessible.
If the reported performance proves reliable in real-world conditions, the strategic edge once held by stealth-enabled LPIR could be significantly reduced. Nations heavily invested in radar-evading platforms may soon face renewed pressure to innovate new countermeasures.
This case underscores a growing trend in modern defense: the blurring line between civilian technology and high-performance military applications.
