Hi, maybe this is a dumb question, but I am not sure about this.
GPS satellites have ability to activate Anti-Spoofing (A-S) mode, in which known code P is replaced with classified military code Y. Older receivers (like trimble 4700) are able to track those satellites using few tricks, and this ability is clearly mentioned in their datasheets and manuals. However datasheets for new receivers mention no such ability.
Is this becouse it's too obvious and not worth even mentioning?
Or these receivers don't have this ability and become blind when code Y triggers?
Or maybe A-S doesn't affect them, becouse they use L2C and L5 codes and don't need it?
Selective Availability was discontinued in May 2000 and I believe the U.S. Government has stated that they have no intention of using it in the future.
http://www.gps.gov/systems/gps/modernization/sa/
Mr. Schrock,
Can you help a brother out?
That notice about "PNT Executive Committee Proposes Codeless/Semicodeless Transition Plan" was way over my head. What does that mean for a surveyor in 2020? Will all of the equipment in use today become obsolete in 2020? There will have been, at least, a couple of generations of equipment between now and then.
Probably only an old timer hanging on to old stuff because it "still gets the job done" will suffer.
Just upgraded my desktop computer after 6 years. Kicking myself for not doing it sooner. The old system was one of those that "still gets the job done".
JA, PLS SoCal