GPS jamming -- an interesting article

[Efchak]

Here is a quite interesting link on jamming and with all that's going on in the world right now it is quite relevant.

https://gpsjam.org/?lat=37.58100&lon=37 ... 2024-04-03

Hal Kennedy, N4GG, forwarded this to me with the following comment:

Here is an interesting map that I'm a little surprised exists. It shows regions of GPS jamming. It was included in an article I read concerning Israel jamming GPS over Israel and Iran in an effort to defend against missiles coming from Iran.

You can zoom the map and move it around. I noticed jamming over the Ukraine/Russia border and over St. Petersburg - that's the Russians trying to defend against Ukraine drones and missiles.

My limited knowledge of the subject is that missiles have their GPS antennas pointed up with deep nulls pointing down. It's really hard to jam from the ground - although with enough power I guess you can. Jamming from above (aircraft, space) well, that's another story... THen there is augmented GPS that can switch among sources. Lots of technology in play...

ed
wx2r

[SWAMPER]

I know the military has the ability to adjust how actuate the GPS operates, basically scrambling the signal.

[Michael M]

That was SA (Selective Availability). It was turned off during the Clinton administration. I remember being excited about that decision. At that time, we had Garmin (with their Street Pilot) and Magellan, who were the two main players in moving maps, and things were really taking off for consumer GPS equipment. The removal of SA was important to that market. I believe what the US government now has to protect national interests is not a degradation of the signal, which is what SA did, but a denial of the service.

GPS navigation is ubiquitous in aviation today. If Chris reads this maybe he'll pop in and fill in the blanks on the aviation side.

I know the military has the ability to adjust how actuate the GPS operates, basically scrambling the signal.