How aircraft can detect and resist GPS spoofing

What can nations do about the growing problem of GPS spoofing near Ukraine?

The discussion concentrates on defensive navigation upgrades, including signal-direction and distortion checks, encryption, and independent references, rather than a way to stop the perpetrators.

Direction-of-arrival sensing can check whether a navigation signal appears to come from the expected direction. Signal-distortion analysis instead examines properties such as its amplitude profile, and may be primarily a software change unless older equipment needs more computing power. Encryption is discussed as another protection, with different access and equipment constraints for commercial and military users. Ground stations at known positions can provide an additional reference, although those signals also need checking. Updating older commercial aircraft is identified as a practical difficulty. Systems designed around trusted signals and lower costs face a harder environment as more actors copy demonstrated spoofing methods. The exchange stays at the level of defensive approaches and explicitly avoids a detailed technical treatment.