3.13.3 PPP (3): Processing Options
BNC allows using various Point Positioning processing options depending on the capability of the involved receiver and the application in mind. It also allows introducing specific sigmas for code and phase observations as well as for reference coordinates and troposphere estimates. You may also like to carry out your PPP solution in Quick-Start mode or enforce BNC to restart a solution if the length of an outage exceeds a certain threshold. -
--The intention of this panel is to specify general processing options to be applied to all PPP threads carried out in one BNC job. +
BNC allows using various Point Positioning processing options depending on the capability of the involved receiver and the application in mind. It also allows introducing specific sigmas for code and phase observations as well as for a-priory coordinates and troposphere estimates. You may also like to carry out your PPP solution in Quick-Start mode or enforce BNC to restart a solution if the length of an outage exceeds a certain threshold. +
++The intention of this panel is to specify general processing options to be applied to all PPP threads in one BNC job.
@@ -2548,5 +2548,5 @@
-Select on which kind of ionosphere-free Linear Combinations (LCs) of observations you want to base ambiguity resolutions. This implicitly defines the kind of GNSS observations you want to use. The selections is to be done per GNSS system ('GPS LCs', 'GLONASS LCs', 'Galileo LCs', 'BDS LCs'). +Specify on which ionosphere-free Linear Combinations (LCs) of observations you want to base ambiguity resolutions. This implicitly defines the kind of GNSS observations you want to use. The specification is to be done per GNSS system ('GPS LCs', 'GLONASS LCs', 'Galileo LCs', 'BDS LCs').
@@ -2565,5 +2565,5 @@
3.13.3.2 Code Observations - mandatory
@@ -2574,5 +2574,5 @@
3.13.3.3 Phase Observations - mandatory
-Enter a 'Sigma L1' for L1 phase observations in meters. The higher the sigma you enter, the less the contribution of L1 phase observations to a PPP solutions based on a combination of code and phase data. 0.01 is likely to be an appropriate choice. +Enter a 'Sigma L1' for L1 phase observations in meters. The bigger the sigma you enter, the less the contribution of L1 phase observations to a PPP solutions based on a combination of code and phase data. '0.01' meters is likely to be an appropriate choice.
@@ -2583,10 +2583,26 @@ As the convergence characteristic of a PPP solution can be influenced by the ratio of sigmas for code and phase, you may like to introduce sigmas which differ from the default values.
3.13.3.4 Elevation Depending Weighting - mandatory
3.13.3.4 Elevation Dependent Weighting - mandatory
+BNC allows elevation dependent weighting when processing GNSS observations. A weight function +
+ +P = cos² * z
+ ++with 'z' being the zenith distance to the involved satellites can be applied instead of the simple weight function 'P = 1'. +
++Default is using the plain weight function 'P = 1' for code and phase observations. +
3.13.3.5 Minimum Number of Observations - mandatory
3.13.3.7 Wait for Clock Corrections - optional
-Zero value (or 'no') for 'Wait for clock corr.' means that BNC processes each epoch of data immediately after its arrival using satellite clock corrections available at that time. Non-zero value means that epochs of data are buffered and the processing of each epoch is postponed till satellite clock corrections not older than 'Wait for clock corr' are available. Specifying a value of half the update rate of the clock corrections (i.e. 5 sec) may be appropriate. Note that this causes an additional delay of the PPP solutions in the amount of half of the update rate. -
--Using observations in sync with the corrections can avoid a possible high frequency noise of PPP solutions. Such noise could result from processing observations regardless of how late after a clock correction they were received. Note that applying the 'Sync Corr' option significantly reduces the PPP computation effort for BNC. +Zero value (or 'no') for 'Wait for clock corr.' means that BNC processes each epoch of data immediately after its arrival using satellite clock corrections available at that time. Non-zero value means that epochs of data are buffered and the processing of each epoch is postponed till satellite clock corrections not older than 'Wait for clock corr.' are available. Specifying a value of half the update rate of the clock corrections (i.e. 5 sec) may be appropriate. Note that this causes an additional delay of the PPP solutions in the amount of half of the update rate. +
++Using observations in sync with the corrections can avoid a possible high frequency noise of PPP solutions. Such noise could result from processing observations regardless of how late after a clock correction they were received. Note that applying the 'Wait for clock corr.' option significantly reduces the PPP computation effort for BNC.
@@ -2610,5 +2626,5 @@
-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 60 is likely to be an appropriate choice for 'Seeding'. Default is an empty option field, meaning that you don't want BNC to start in Quick-Start mode. +This so-called Quick-Start option allows the PPP solutions to rapidly converge after startup. It requires that the antenna remains unmoved on the known position throughout the defined period. A value of '60' seconds is likely to be an appropriate choice for 'Seeding'. Default is an empty option field, meaning that you don't want BNC to start in Quick-Start mode.
You may need to create your own reference coordinate beforehand through running BNC for an hour in normal mode before applying the 'Seeding' option. Don't forget to introduce realistic North/East/Up sigmas under panel 'PPP (2)' according to the coordinate's precision. @@ -2641,5 +2657,5 @@
-PPP time series of North (red), East (green) and Up (blue) displacements will be plotted under the 'PPP Plot' tab when this option is ticked. Values will be either referred to an XYZ reference coordinate (if specified, see 'Coordinates') or referred to the first estimated positionn. The sliding PPP time series window will cover the period of the latest 5 minutes. +PPP time series of North (red), East (green) and Up (blue) displacements will be plotted under the 'PPP Plot' tab when this option is ticked. Values will be either referred to an XYZ reference coordinate (if specified, see 'Coordinates') or referred to the first estimated position. The sliding PPP time series window will cover the period of the latest 5 minutes.
@@ -2649,5 +2665,5 @@
3.13.4.2 Audio Response - optional
-For natural hazard prediction and monitoring it may be appropriate to generate audio alerts. For that you can specify an 'Audio response' threshold in meters. A beep is produced by BNC whenever a horizontal PPP coordinate component differs by more than the threshold value from the specified marker coordinate. +For natural hazard prediction and monitoring landslides it may be appropriate to generate audio alerts. For that you can specify an 'Audio response' threshold in meters. A beep is produced by BNC whenever a horizontal PPP coordinate component differs by more than the threshold value from the specified marker coordinate.
@@ -2661,5 +2677,5 @@
-You make like to track your rover position using Google Maps or Open StreetMap as background map. Track maps can be produced with BNC in 'Real-time Streams' mode or in 'RINEX Files' post processing mode with data coming from files. +You may like to track your rover position using Google Maps or Open StreetMap as a background map. Track maps can be produced with BNC in 'Real-time Streams' mode or in 'RINEX Files' post processing mode with data coming from files.
@@ -2667,5 +2683,5 @@
-The 'Open Map' button opens a windows showing a map according to the specified 'Google/OSM' option. +The 'Open Map' button opens a windows showing a map according to the selected 'Google/OSM' option.
@@ -2677,5 +2693,5 @@3.13.4.4 Dot-properties - mandatory before pushing 'Open Map'
-PPP tracks are presented on maps through plotting one colored dot per epoch. +PPP tracks are presented on maps through plotting one colored dot per observation epoch.