GPS signals are relatively low power (American GPS broadcasts at 25 watts and the signal is a tiny fraction of a mW at sea level). In theory, it's easy to pump out noise over it, especially the civilian frequencies that Iran would in theory be using.
Depending on the receivers and what (combination?) of GPS/GLONASS/GALILEO/BAIDU Iran uses, you could easily overwhelm them.
There have been cases of delivery drivers using jammers to stop companies from tracking them, only to interfere with airport landing systems, which is a concern as a lot of warehouses are near airports.
> GPS signals are relatively low power (American GPS broadcasts at 25 watts and are ~10-15W at sea level)
Did you lose 16 orders of magnitude for the sea level values? GPS signal strength on the ground is usually below -135dBm per square meter. That gives you a couple of femtowatts with commonly used antenna, if you're lucky.
Depending on the receivers and what (combination?) of GPS/GLONASS/GALILEO/BAIDU Iran uses, you could easily overwhelm them.
There have been cases of delivery drivers using jammers to stop companies from tracking them, only to interfere with airport landing systems, which is a concern as a lot of warehouses are near airports.
EDIT: power at ground level is miniscule