Global Positioning System Reference
In-Depth Information
95% probability) in the horizontal plane and 45m (95% probability) in the vertical
plane [26]. Velocity measurement accuracy is between 3 and 5 cm/sec [1, 27].
11.1.11 Future GLONASS Development
The Russians plan a number of changes to the GLONASS program in the future.
These changes include improvements to the ground support segment, the space seg-
ment, and augmentation to provide differential services and to support SAR [1].
11.1.11.1 Space Segment Enhancements
The Russians plan to introduce two new generations of spacecraft to the constella-
tion designated GLONASS-K and GLONASS-KM (sometimes referred to as the
GLONASS-NG). The GLONASS-K is in the late stages of design and development
with the first launched planned in 2007-2008. The GLONASS-KM is in a concep-
tual phase with the first launch planned in 2015. No other information is available
on the GLONASS-KM. The GLONASS-K is described in detail next [9-12, 16-18]:
GLONASS-K
In 2007 to 2008, the Russians plan to start launching the new GLONASS-K space-
craft series. Currently, the Russians plan to produce 18-27 satellites in this series.
The GLONASS-K represents a radical change in GLONASS spacecraft design,
adopting a Western-style nonpressured and modular spacecraft bus design. Figure
11.5 is a depiction of the GLONASS-K spacecraft. As a result, the GLONASS-K
Figure 11.5
GLONASS-K spacecraft.
 
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