IS-GPS-200E: Flexing Power and Fixing Phase Ambiguities

IS-GPS-200E: Flexing Power and Fixing Phase Ambiguities
http://www.insidegnss.com/node/2285

High-precision users of GNSS are used to solving for carrier phase
integer ambiguities, but the recent publication of a GPS technical
document has fixed a different kind of phase ambiguity — a linguistic
one: the difference between “shall” and “can.”

The devil, as the old adage goes, is in the details. And, when it came
to the question of the stability of the new civil L2 (L2C) signal, a lot
of people are reading the fine print in the Interface Specification for
GPS version 200E (IS-GPS-200E) released by the U.S. Air Force on August 13.

At issue were details of the new “flex power” capability being added for
military GPS signals, which enables operators of the system to increase
the signal strength of the military P(Y) and M-code signals if needed by
Department of Defense (DoD) and allied GPS users.

See: http://www.insidegnss.com/node/2285