this post was submitted on 23 Nov 2023
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What about GLONASS, Galilleo, or BDS? Are they all being equally jammed? Why wouldn’t they sync with all of them and use a consensus to determine accuracy? Like having multiple ntp servers.
The latest generations of gnss receivers have spoofing and jamming mitigation and detection features included with the chip, and multi-band rx technology to sync to more constellations simultaneously and do exactly what you're talking about. Before then, the spoofing/jamming detection would likely need a software implementation after the receiver. There are different types of spoofing/jamming, all of which are detected and mitigated in different ways.
I don't know the commercial aircraft industry standards for updating technology, but I wouldn't be surprised if most commercial aircraft don't have what you're talking about.