Seatex DPS 200 Installation Manual, rev. 4 Installation
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3.9.9 Range and age limit on reference stations
It is possible to exclude long distance reference stations from the position solution. This
option is useful when operating in areas with high ionospheric activity, e.g. in Brazil and
Africa. Optimum accuracy is achieved when the maximum distance to the reference stations is
less than 1000 km. When operating in other areas, the default configuration should be used.
The maximum range limit is 10 000 km. If a range limit is set outside this limit,
10 000 km will be used.
DIFFCORR RANGE LIM 2000 [km]
Default range limit is 2000 km.
The maximum age of corrections can also be set in the setup file. If the age exceeds the limit,
the correction is not included in the fix computation.
DIFFCORR AGE LIM 90 [s]
Default age is 90 seconds.
3.9.10 Differential correction settings
It is possible to define several correction links in the DPS system. The links can be set up to
decode SCF (Supercompressed format), RTCM (RTCM Sc-104 v2.2 format) or TOPNAV
(DGPS and DVAR from Thales receivers).
DCLNK2 TYPE SCF
Link names can also be edited in the setup file. The link names will be displayed in the TMS
display together with the link status indicator.
DCLNK2 NAME LINK 2
Some of the reference stations do not transmit/broadcast their station co-ordinates (i.e. IALA
stations). If the system does not receive the station co-ordinates, they are given a default range
of 10 000 km and are hence given a low weight in the position solution. However, if the link
is set up as a short-range link, the station will be used in a correct manner in the position
solution.
DCLNK1 SHORT RANGE 1 ! 1: Treat link as a short range link (e.g. IALA) 0: Normal operation
Note Link 1 is reserved for IALA Beacon corrections.
3.9.11 Handling of corrections (from Fugro Starfix Plus)
It is possible to define a link as "ionospheric free". This is achieved by utilising dual frequency
GPS receivers on both the reference station and the mobile station. Fugro Starfix Plus offers
DGPS corrections where the ionospheric contribution is removed. To treat these corrections
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