+Enter the reference coordinate components X,Y,Z of the receiver's position in meters if known. Default are empty option fields, meaning that the antenna's XYZ position is unknown. +
++Once XYZ coordinate components are defined, the 'PPP' line in BNC's logfile is extended by Nort, East and Up desplacements to (example): +
++10-08-09 06:01:56 FFMJ1 PPP 06:02:09.0 11 4053457.628 +- 2.639 617729.438 +- 1.180 4869396.447 +- 1.921 NEU -0.908 -0.571 1.629 ++
+The parameters following the 'NEU' string provide Nort, East and Up components of the current coordinate displacement in meters. +
+ BNC allows to use different Point Positioning processing options depending on the capability of the involved receiver and the application in mind. - --By default BNC considers the rover as mobile. It means that the rover coordinates are estimated as stochastic parameters with white noise 100 meters per epoch. Tick 'Static' in a static observation situation to adapt appropriate filter characteristics for that. -
- -3.11.2.2 Use Phase Obs - optional
3.11.2.1 Use Phase Obs - optional
By default BNC applies a Point Positioning solution using an ionosphere free P3 linear combination of code observations. Tick 'Use phase obs' for an ionosphere free L3 linear combination of phase observations.
-3.11.2.3 Estimate Tropo - optional
3.11.2.2 Estimate Tropo - optional
BNC estimates the tropospheric delay according to equation @@ -1154,34 +1169,54 @@
-3.11.2.4 Use GLONASS - optional
3.11.2.3 Use GLONASS - optional
By default BNC does not process GLONASS observations when in Point Positioning mode. Tick 'Use GLONASS' to use GPS and GLONASS observations for estimating coordinates in Point Positioning mode.
+ ++PPP time series of North (red), East(green) and Up (blue) coordinate components will be plotted in the 'PPP Plot' tab when this option ticked. Values will be either referred to an XYZ reference coordinate (if specified) or referred to the first estimated XYZ coordinate. The sliding PPP time series window will cover the period of the latest 5 minutes. +
++Note that a PPP time series makes only sense for a stationary operated receiver. +
+-You may like to introduce a specific ratio between the sigmas for code and phase observations. You may also like to output average position values. -
- -3.11.3.1 Sigma Code - mandatory if 'Use Phase Obs' is set
3.11.3.1 Sigma Code/Phase - mandatory if 'Use Phase Obs' is set
When 'Use phase obs' is set in BNC the PPP solution will be carried out using both, code and phase observations. A sigma of 5.0 m for code observations and a sigma of 0.02 m for phase observations (defauls) is used to combine both types of observations. -As the convergence characteristic of a PPP solution can be influenced by the ratio of the sigmas for code and phase, you may like to introduce you own sigma for code observations which differs from the default of 5.0 m. -
-Note that the 'Sigma code' you enter must be greater than 0.3 m and less than 50.0 m. -
- -3.11.3.2 Averaging - optional if appropriate 'Origin' option is set
-Enter the length of a sliding time window in minutes. BNC will continuously output moving average positions and their RMS as computed from those individual positions obtained most recently throughout this period. RMS values presented for XYZ coordinates are bias reduced while RMS values for Nort/East/Up (NEU) displacements are not. Averaged values for XYZ coordinates and their RMS are marked with string "AVE-XYZ" in BNC's log file and 'Log' section while averaged values for NEU displacements and their RMS are marked with string "AVE-NEU". Example: +As the convergence characteristic of a PPP solution can be influenced by the ratio of the sigmas for code and phase, you may like to introduce you own sigmas for code and phase observations which differ from the default of 5.0 m and 0.02 m respectively. +
3.11.3.2 Quick-Start - optional if XYZ is set
+Enter the lenght of a startup period in seconds for which you want to fix the PPP solution to a known XYZ coordinate. Constraining coordinate components is done in BNC through setting the 'XYZ White Noise' temporarily to zero. +
++This so-called Quick-Start option allows the PPP solutions to rapidly converge after startup. It requires that the antenna remains unmoved on the know position throughout the defined period. A value of 120 (default) is likely to be an appropriate choice for 'Quick-Start' +
+
+You may need to create your own reference coordinate through running BNC for an hour in normal mode before applying the Quick-Start option. +
+ +
Figure: BNC in 'Quick-Start - Static' mode
+ +3.11.3.3 Averaging - optional if XYZ is set
+Enter the length of a sliding time window in minutes. BNC will continuously output moving average values ns and their RMS as computed from those individual values obtained most recently throughout this period. RMS values presented for XYZ coordinates and tropospheric zenit path delays are bias reduced while RMS values for Nort/East/Up (NEU) displacements are not. Averaged values for XYZ coordinates and their RMS are marked with string "AVE-XYZ" in BNC's log file and 'Log' section while averaged values for NEU displacements and their RMS are marked with string "AVE-NEU" and averaged values for the tropospheric delays and their RMS are marked with string "AVE-TRP". Example:
10-09-08 09:13:05 FFMJ1 AVE-XYZ 09:13:04.0 4053455.948 +- 0.284 617730.422 +- 0.504 4869397.692 +- 0.089 10-09-08 09:13:05 FFMJ1 AVE-NEU 09:13:04.0 1.043 +- 0.179 0.640 +- 0.456 1.624 +- 0.331 +10-09-08 09:13:05 FFMJ1 AVE-TRP 09:13:04.0 2.336 +- 0.002
@@ -1189,38 +1224,27 @@
- --Select an origin -
--QuickStart means that BNC operates for the period of 2 minutes in a mode where an introduced reference coordinate is constrained. The PPP solution is expected to converge within this time span. You may need to create your own reference coordinate through running BNC for an hour in normal mode before applying the QuickStart option. The following options are available: -
-
-
Figure: BNC in 'QuickStart - Static' mode
- --If option 'Plot - X Y Z' or 'QuickStart - Static' is selected, the 'PPP' line in BNC's logfile is extended to (example): -
--10-08-09 06:01:56 FFMJ1 PPP 06:02:09.0 11 4053457.628 +- 2.639 617729.438 +- 1.180 4869396.447 +- 1.921 NEU -0.908 -0.571 1.629 --
-The parameters following the 'NEU' string provide Nort, East and Up components of the current coordinate displacement in meters. +
++You may like to introduce specific estimates for sigmas of parameters to be estimated in the PPP solution. +
+ + ++Enter a sigma in meters for the initial XYZ coordinate componentes. A value of 100.0 may be an appropriate choice. However, this value may be significantly smaller (i.e. 0.01) when starting from a station with a known XYZ position. +
+ +3.11.4.2 XYZ White Noise - mandatory
+Enter a sigma in meters for the 'White Noise' of estimated XYZ coordinate components. A value of 100.0 may be appropriate considering the potential movement of a rover position. +
+ +3.11.4.3 Tropo Init - mandatory if 'Estimate tropo' is set
+Enter a sigma in meters for the a-priory model based tropospheric delay estimation. A value of 0.1 (default) may be an appropriate choice. +
+ +3.11.4.4 Tropo White Noise - mandatory if 'Estimate tropo' is set
+Enter a sigma in meters per second to describe the expected variation of the tropospheric effect. Supposing 1Hz observation data, a value of 1e-6 (default) would mean that the tropospheric effect may vary for 3600 * 1e-6 = 0.0036 meters per hour.
@@ -1710,6 +1734,6 @@