Global Positioning System Reference
In-Depth Information
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[27
Lin
—
0.2
——
No
*PgE
Figure 7.19 NGS CORS network.
Data are received at NGS daily, hourly, and even in real
time. In addition to serving the needs of postprocessing, the CORS system has the potential of
becoming the backbone for real-time geodetic applications nationwide. (Courtesy of NGS.)
[27
th
e results of the baseline processing via email. At this time, only dual-frequency data
ac
cepted.
7.
8 AMBIGUITY FIXING
Fi
xing ambiguities implies converting real-valued ambiguity estimates to integers.
Th
e procedures follow the general linear hypothesis testing as described in Section
4.
9.4. The objective is to constrain the estimated ambiguities of the float solution.
Le
t's assume that the parameters are grouped as
a
b
x
∗
=
(7.133)
The symbol
a
then denotes the estimated station coordinates and possibly other
parameters such as tropospheric refraction or receiver clock errors.
b
denotes the
estimated float ambiguities. Using the same partitioning, other relevant matrices from
the float solution are
