The capability the public patent reveals is the endgame of interception. US10401123B2, "Method and system for the terminal-phase guiding of an interceptor missile towards a mobile aerial target" (assigned to MBDA France), is about the last phase of a missile-defense engagement — when the interceptor is close, time is short, and the target is moving on purpose.
Why terminal phase is the hard part: earlier phases (boost, midcourse) deal in predictable trajectories and have time to correct. Terminal phase has neither. The target may be maneuvering specifically to defeat the intercept, the closing geometry is changing fast, and there is no time for leisurely correction — the guidance law has to convert sensor measurements into commands inside a shrinking window. The seeker tech and the guidance law hide in the dependent claims; the independent claim names the problem. CPC F41G 7/22 (guidance against a target) with G05D 1/12 (vehicle altitude/attitude control) is the classification fingerprint.
As prior art, this grant is useful precisely because it is in the open. Most terminal-guidance development is classified or held closely by primes; a published European grant from MBDA is a rare citable anchor for what the public record actually contains about how interceptors guide in the endgame. If you are checking whether a newer claim is novel over the existing art, records like this are where you start.
Two disciplined caveats. First, the public record only shows so much — the most operationally sensitive guidance and seeker details are exactly what does not get published, so this is a view, not the whole. Second, what is patented is not what is necessarily fielded: a granted method describes an approach, not a deployed, demonstrated interceptor. Treat the claim as evidence of an engineering approach, not of capability.
For the defense-IP reader tracking the missile-defense reboot, the takeaway is methodological. When you want to understand interceptor guidance from the public record, you read grants like this MBDA one and the kinetic-air-defense art around it — and you read the silences just as carefully, because in this corner of the field the absence of a claim often says as much as its presence.