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by jacquesm9 hours ago |

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by leonidasrup9 hours ago|

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Jam resistance and spoof resistantance are very different.

What work is done to make GPS more jam resistant?

by jacquesm9 hours ago|

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L5 is considered to be more jam resistant, but it is still in the process of being rolled out and most receivers do not have that capability. It will take the better part of a decade to be rolled out completely but the space side should be done by 2027 so if you need it you can get it but you'll need a completely new receiver.

https://insidegnss.com/onenav-l5-direct-technology-enables-d...

For obvious reasons hard information about all this is tricky to come by, you can read what is available from non-classified sources though and you can glean quite a bit from there.

https://en.wikipedia.org/wiki/GPS_signals#L5

The third edition of 'Kaplan' is still excellent reading on the subject even though it is 10 years old now.

by toomuchtodo8 hours ago|

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> L5-band signals are 30x harder to jam and interfere with compared to L1, and they offer superior performance in difficult-to-navigate areas such as urban canyons and tree-covered regions.

Impressive performance.

by toomuchtodo9 hours ago|

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https://gps.stanford.edu/research/current-and-continuing-gps...

Single element antennas, adaptive antennas, beam steering antennas. Basically attempting to pull good RF while avoiding bad RF.

(this has been applied in the Russo-Ukrainian war in modified Starlink equipment)

GPS antenna mods make Starlink terminal immune to jammers - https://news.ycombinator.com/item?id=39616417 - March 2024 (72 comments)

https://olegkutkov.me/2023/11/07/connecting-external-gps-ant...

by dingaling28 minutes ago|

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The Russian response to directional antennas is to mount GPS jammers on satellites

https://www.gpsworld.com/todd-humphreys-russian-satellites-a...