SeaSTAR 3610, User Manual, Page: 12 / 76

SeaSTAR 3610 USER MANUAL
Issue 2.3 02/11
2
The signals are received via the antenna/DGNSS receiver. After selection of the
desired individual reference site's data set, the signals are made available as
corrections for use in a GPS and GLONASS differential capable receiver.
The 3610 DGNSS receiver supports the following SeaSTAR services:
1. SeaSTAR HP
2. SeaSTAR G2
3. SeaSTAR XP
4. SeaSTAR DGNSS
5. SeaSTAR VBS
SeaSTAR HP is a decimetre level phase-based service. It is derived from the GPS L1
and L2 frequencies for centimetres. The service uses GPS phase measurements to
obtain an accuracy of 10 cm horizontally (95%) and 15 cm vertically (95%). Available
in Europe, America, the Middle East and Asia.
SeaSTAR G2 uses the GPS L1 and L2 frequencies in both GPS and GLONASS to
compensate for ionospheric delay. The orbit/clock concept utilizes reference stations
with a worldwide spread to calculate the orbit and the clock value of each GPS and
GLONASS satellite more accurately than the broadcast ephemeris. Orbit and clock
corrections to the broadcast ephemeris are then transmitted to the user. These
corrections are valid worldwide and the distance from the nearest reference stations
to the user does not affect performance.
SeaSTAR XP is a decimetre level phase-based service. It uses worldwide valid
orbit/clock data that is based on GPS L1 and L2 frequencies.
This concept uses reference stations with a worldwide spread to calculate the orbit
and the clock value of each GPS satellite more accurately than the broadcast GPS
ephemeris. Orbit and clock corrections used to broadcast ephemeris, are then
transmitted to the user. These corrections are valid worldwide and the distance from
the nearest reference stations to the user does not affect performance.
SeaSTAR DGNSS is a metre level code-based service. It is based on GPS L1 and
GLONASS L1 frequencies. This is similar to DGPS. Since GLONASS is not fully
operational, DGLONASS has to be used together with DGPS to increase the number
of available satellites in the navigation solution. Available in South America, West
Africa, Europe, the Middle East and upon request in other areas.
SeaSTAR VBS (Virtual Base Station)
is a metre level code-based service based on
the GPS L1 frequency. VBS provides users with accurate positioning with a correction
message further enhanced from their location. This multiple reference station solution
can provide accuracy to within one metre. VBS provides consistent accuracy over
wide areas. VBS is highly reliable since it is not dependent on any single reference
station. There are no position jumps due to switching from one reference station to
another. Available worldwide.
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