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Hypersonic vehicles create an unusually difficult navigation problem. Traveling at several times the speed of sound leaves little room for positioning errors, while satellite navigation may be jammed, spoofed, or unavailable during military operations. High-speed flight creates another complication: extreme heating and airflow around the vehicle can interfere with sensors that would otherwise provide an independent reference.
Researchers at the Guangdong Aerospace Research Academy have reportedly developed a celestial navigation system designed to address that problem by using stars instead of satellite signals. The self-contained technology tracks the apparent movement and position of stars to calculate a vehicle’s orientation and movement during flight, providing an alternative source of navigation information without relying on external electromagnetic signals.
Celestial navigation is far from new. Sailors have used stars to determine their position for centuries, while spacecraft commonly use star trackers to establish orientation. According to NextGenDefense, applying the principle to hypersonic flight, however, requires sensors and software capable of recognizing celestial patterns while the vehicle travels through an extremely demanding aerodynamic environment.
The researchers built their system using extensive star databases and prototype sensing hardware. Observed star patterns are compared with stored references, allowing the navigation system to determine how the vehicle is oriented and use that information as part of its positioning calculations.
One of the main technical challenges comes from the environment surrounding a hypersonic vehicle. At very high speeds, compressed air and intense heating can alter how light reaches onboard sensors, potentially distorting the apparent position or appearance of stars. The researchers therefore developed software models to simulate these effects, including radiation-related interference, and compensate for them during navigation.
Under ideal test conditions, the prototype reportedly achieved 99% accuracy in identifying star patterns. When researchers introduced stronger interference intended to reproduce conditions associated with high-speed flight, recognition accuracy remained at approximately 80%.
The system could reportedly determine vehicle orientation to within five arcseconds, putting its angular precision in a range comparable with modern spacecraft star-tracking systems. The published information does not, however, establish the complete positional accuracy of an operational hypersonic weapon using the technology.
For defense applications, the main attraction is resilience. Hypersonic weapons and other advanced aircraft operating in contested environments cannot assume continuous access to GNSS. A celestial system could provide another navigation layer alongside inertial sensors and other positioning technologies, making the overall system less dependent on satellite signals.
The technology may also have civilian applications. Researchers say related sensing methods could support aerospace testing and observe combustion processes inside aircraft engines or industrial boilers.
Using stars will not eliminate every navigation challenge associated with hypersonic flight, particularly under poor viewing conditions or intense optical interference. But the research demonstrates how one of humanity’s oldest navigation references could become a backup for some of its fastest modern vehicles.
