Hit the 'Add Row' button, double click on the 'Mountpoint' field, enter a Broadcast Correction mountpoint from the 'Streams' section -and hit Enter. Then double click on the 'AC Name' field to enter your choice of an abbreviation for the Analysis Center (AC) providing -the Antenna Phase Center (APC) related correction stream. Finally, double click on the 'Weight' field to enter a weight to be applied -to this stream in the combination.
+and hit Enter. ++Then double click on the 'AC Name' field to enter your choice of an abbreviation for the Analysis Center (AC) providing +the Antenna Phase Center (APC) related correction stream.
++After that, double click on the 'Weight Factor' field to enter a weight to be applied to this stream in the combination. +A Factor greater than 1 will enlarge the sigma of the clock pseudo-observations and with it down-weight its contribution.
++Finally, double click on the 'Exclude Satellites' field and specify satellites or satellite systems, to exclude them for an individual AC. +An entry 'G04,G31,R' means to excludes GPS satellites PRN 4 and 31 as well as all GLONASS satellites from one individual AC. +Default is an empty option field, meaning that no satellite is excluded from this individual AC.
++Note that the orbit information in the resulting combination stream is just copied from one of the incoming streams. +The stream used for providing the orbits may vary over time: if the orbit providing stream has an outage +then BNC switches to the next remaining stream for getting hold of the orbit information.
++The combination process requires Broadcast Ephemeris. +Besides orbit and clock correction streams BNC should therefore pull a stream carrying Broadcast Ephemeris in the form of RTCM Version 3 messages.
++It is possible to specify only one Broadcast Ephemeris Correction stream in the 'Combine Corrections' table. +Instead of combining corrections BNC will then add the corrections to the Broadcast Ephemeris with the possibility +to save final orbit and clock results in SP3 and/or Clock RINEX format. +
The sequence of entries in the 'Combine Corrections' table is not of importance. @@ -4521,22 +4543,31 @@ Select a clock combination method. Available options are 'Kalman Filter' and 'Single-Epoch'. It is suggested to use the 'Kalman Filter' approach in case the combined stream of Broadcast Corrections -is intended for Precise Point Positioning. -
- -BNC combines all incoming clocks according to specified weights. Individual clock estimates that differ by more than -'Maximal Residuum' meters from the average of all clocks will be ignored. +'Maximal Clk Residuum' meters from the average of all clocks will be ignored. It is suggested to specify a value of about 0.2 m for the Kalman Filter combination approach and -a value of about 3.0 meters for the Single-Epoch combination approach. -
--Default is a 'Maximal Residuum' of 999.0 meters.
- -+Default is a 'Maximal Clk Residuum' of 999.0 meters.
+ ++BNC builds mean values for all incoming orbit corrections per satellite. +Individual orbit corrections that differ by more than 'Maximal Orb Displacement' meters from the average +of all orbit corrections per satellite will be ignored. It is suggested to specify a value of about 0.5 m.
++Default is a 'Maximal Orb Displacement' of 2.0 meters.
+ +Specify a combination sampling interval. Orbit and clock corrections will be produced following that interval. -A value of 10 sec may be an appropriate choice. -
+A value of 10 sec may be an appropriate choice. + ++Specify for each satellite system whether the clock corrections shall be combined.