China’s Mach 5+ hypersonic weapons turn to stars for navigation when GPS signals fail

China has developed a star-based navigation system designed to guide hypersonic vehicles when satellite signals become unreliable. Researchers at the Guangdong Aerospace Research Academy completed the project after an expert review on Monday. The academy reported the results on August 10. The system targets a major weakness in high-speed flight. Satellite navigation can fail when an adversary jams GPS or China’s BeiDou system. Celestial navigation offers another path. It uses stars as fixed reference points to determine a vehicle’s position and orientation. That approach could give hypersonic weapons another navigation layer during contested operations. It also reduces their reliance on external signals. Stars guide hypersonic flight Celestial navigation has existed for centuries, but hypersonic flight creates unusual engineering problems. A vehicle traveling above Mach 5 produces intense heating as it pushes through the atmosphere. That process creates a hot layer of gas around the vehicle. The layer can distort incoming starlight before sensors can process it. It also produces strong radiation that can overwhelm faint signals from stars. Researchers tackled the problem through radiation modeling and specialized sensing hardware. Their work included databases covering hot-air radiation and thermal interference. The team also developed software to model radiation around a high-speed vehicle. The simulations reached spectral resolution down to 0.12 nanometers. Researchers reported simulation errors within 18.9 percent. The models helped them estimate how atmospheric effects could alter the appearance of stars. That information fed into a prototype star sensor designed to operate under heavy radiation interference. The challenge goes beyond detecting stars. A navigation system must identify patterns quickly enough to support a vehicle moving at extreme speeds. Sensor survives harsh conditions Testing produced a recognition rate above 99 percent without radiation interference. Performance dropped under severe aerodynamic interference, but the system still recognized star patterns above 80 percent. The sensor also achieved attitude measurement accuracy better than 5 arcseconds. One arcsecond equals 1/3,600 of a degree. That precision matters for vehicles moving extremely quickly. Small navigation errors can grow into significant position errors during flight. The system could work alongside inertial navigation instead of replacing it. That combination could provide a backup when satellite-based navigation becomes unavailable. For U.S. defense planners, the development reflects a broader navigation challenge surrounding hypersonic weapons. American systems also face the problem of operating when GPS signals come under attack. The Chinese research extends beyond military applications, according to the academy. Researchers have adapted the radiation technology for engine testing and industrial combustion monitoring. The academy said those applications have generated nearly 10 million yuan in additional sales. It also said aerospace institutes have used the technology for mission-critical projects. For hypersonic vehicles, the central challenge remains navigation through an environment that can effectively hide the stars. China’s prototype suggests engineers are finding ways to overcome that problem. A reliable celestial backup could make high-speed vehicles less dependent on satellite signals. The capability could prove useful during missions where electronic warfare disrupts conventional navigation systems. It also gives designers another way to maintain guidance when external positioning signals become unavailable. Get the latest in engineering, tech, space & science - delivered daily to your inbox.Aamir is a seasoned tech journalist with experience at Exhibit Magazine, Republic World, and PR Newswire. With a deep love for all things tech and science, he has spent years decoding the latest innovations and exploring how they shape industries, lifestyles, and the future of humanity.