Infrastructure – NavCom SF-2050 Rev.D User Manual

Page 46

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SF-2050 User Guide - Rev. D

Infrastructure

The system utilizes the

GPS

satellite system,

L-Band

communication satellites, and a worldwide network of

reference stations

to deliver real-time high precision

positioning.

To provide this unique service, NavCom has built a
global network of

dual-frequency

reference stations

,

which constantly receive signals from the

GPS

satellites

as they orbit the earth. Data from these

reference

stations

is fed to two USA Processing Centers in

Torrance, California and Moline, Illinois where they are
processed to generate the differential corrections.

From the two Processing Centers, the correction data is
fed via redundant and independent communication
links to satellite uplink stations at Laurentides in
Canada, Goonhilly in England and Auckland in New
Zealand for uplink to the geo-stationary satellites.

The key to the accuracy and convenience of the

StarFire

™ system is the source of

SBAS

corrections.

GPS

satellites transmit navigation data on two

L-Band

frequencies. The

StarFire

reference stations

are all

equipped with geodetic-quality,

dual-frequency

receivers. These reference receivers decode

GPS

signals

and send precise high quality

dual-frequency

pseudorange

and carrier phase measurements back to

the Processing Centers together with the data
messages, which all

GPS

satellites broadcast.

At the Processing Centers, NavCom's proprietary

differential

processing techniques used to generate real

time precise orbits and clock correction data for each
satellite in the

GPS

constellation. This proprietary

Wide

Area

DGPS

(

WADGPS

) algorithm is optimized for a

dual-frequency

system such as

StarFire

™ in which

dual-

frequency

ionospheric measurements are available at

C-44

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