FOAM [1] is trying to solve this. They're using a distributed network of radio beacons which offer location services using time synchronization.
LoRa is particularly susceptible to jamming. Given the frequencies used, accidental jamming by legally operating transmitters is a very real possibility.
It also turns out that LoRaWAN is vulnerable to selective jamming, but I'm not sure whether or not FOAM is looking to make use of the LoRaWAN layer.