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Which of the following position services provided by the GPS require crypto keys?(a) Precise position service(b) Standard position service(c) Ultimate position service(d) Doppler position serviceThis question was posed to me in class test.This interesting question is from NAVSTAR GPS in chapter Satellite Radio Navigation& Inertial Navigation of Avionics

Answer»

The correct CHOICE is (a) Precise position service

To explain I would say: GPS provides two position services, The precise position service and the standard position service. The PPS can be DENIED to UNAUTHORIZED users while SPS is free to everyone. Users NEED crypto keys to access the PPS. These are generally military users.



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