Global Positioning System Reference
In-Depth Information
Jammu
Amritsar
Delhi
Guwahati
Lucknow
Bhuj
Ahemdabad
Indore
Kolkata
INRESs
Nagpur
Future INRESs
Visakhapatnam
Bangalore
Chennai
Port Blair
Thiruvananthapuram
Figure 8.29
GAGAN ground network.
NAS
GPS satellite
GPS/WAAS user
(1) Collect data
(2) Determine iono corrections
Geo Satellite
(3) Determine satellite orbits
(7) Provide SBAS
message broadcast
and ranging
(6) Provide independent
data verifications
(4) Determine satellite corrections
(5) Determine satellite integrity
SBAS user
Geo satellite broadcast
GPS signal
(8) System operations and maintenance
SBAS functional relationships
Figure 8.30
SBAS functional overview.
frequency and GPS C/A code type of modulation, including the use of length-1,023
Gold codes at a 1.023-MHz chip rate, are used. In addition, the code phase timing is
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