In 2008, China will likely release a user
equipment interface specification for the
Beidou system, enabling the design of
commercial user equipment. Releasing
a system specification early has worked
well for European Global Navigation
Overlay System (EGNOS), scheduled
to be officially operational in 2008.
The EGNOS milestone is significant
for aviation from a regulatory point of
view, however many commercial users
have been successfully using EGNOS
for years because of the availability of
commercial equipment made possible
by the early specification release.
Russia plans two launches in 2008,
which could lead to as many as 22
orbiting GLONASS satellites, within
range of a full 24 satellite constellation
(21 broadcasting / 3 spares). This would
provide a full measure of redundancy
for GPS/GLONASS users and perhaps
move GLONASS from an augmentation
to an independent positioning system
for the first time since 1995.
The GPS system plans to launch the
remaining 3 block IIR-M satellites, and
take delivery of the first IIF satellite in
2008, filling out more of the constellation
with civilian L2 capability using the
new signal. The block IIF delivery also
sets the stage for third frequency, L5.
All this was made possible by the most
important and overlooked milestone of
2007, the GPS architecture evolution
program (AEP) ground control upgrade
of September 14. This milestone was
important because it put into place
the capability of controlling the entire
feature set of the remaining block II
satellites, and overlooked because it
changed over from an old mainframe
and software to a distributed platform
with new software without anyone
noticing an operational transition. This
demonstrates that maintaining operations
during major upgrades is achievable. |