Changeset 7027 in ntrip


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Timestamp:
Jul 8, 2015, 10:05:32 PM (10 years ago)
Author:
weber
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  • trunk/BNC/src/bnchelp.html

    r7025 r7027  
    460460&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3.13.3.2 <a href=#pppcodeobs>Code Observations</a><br>
    461461&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3.13.3.3 <a href=#pppphaseobs>Phase Observations</a><br>
    462 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3.13.3.4 <a href=#pppeleweight>Elevation Depending Weighting</a><br>
     462&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3.13.3.4 <a href=#pppeleweight>Elevation Dependent Weighting</a><br>
    463463&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3.13.3.5 <a href=#pppminobs>Minimum Number of Observations</a><br>
    464464&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3.13.3.6 <a href=#pppmineleva>Minimum Elevation</a><br>
    … …  
    25392539
    25402540<p><a name="pppOptions"><h4>3.13.3 PPP (3): Processing Options</h4></p>
    2541 <p>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.
    2542 </p>
    2543 <p>
    2544 The intention of this panel is to specify general processing options to be applied to all PPP threads carried out in one BNC job.
     2541<p>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.
     2542</p>
     2543<p>
     2544The intention of this panel is to specify general processing options to be applied to all PPP threads in one BNC job.
    25452545</p>
    25462546
    … …  
    25482548<p>
    25492549<p>
    2550 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').
     2550Specify 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').
    25512551</p>
    25522552<p>
    … …  
    25652565<p><a name="pppcodeobs"><h4>3.13.3.2 Code Observations - mandatory</h4></p>
    25662566</p>
    2567 Enter a 'Sigma C1' for C1 code observations in meters. The higher the sigma you enter, the less the contribution of C1 code observations to a PPP solution based on a combination of code and phase data. 2.0 is likely to be an appropriate choice.
     2567Enter a 'Sigma C1' for C1 code observations in meters. The bigger the sigma you enter, the less the contribution of C1 code observations to a PPP solution based on a combination of code and phase data. '2.0' meters is likely to be an appropriate choice.
    25682568</p>
    25692569<p>
    … …  
    25742574<p><a name="pppphaseobs"><h4>3.13.3.3 Phase Observations - mandatory</h4></p>
    25752575<p>
    2576 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.
     2576Enter 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.
    25772577</p>
    25782578<p>
    … …  
    25832583As 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.
    25842584<ul>
    2585 <li>Introducing a smaller sigma (higher accuracy) for code observations or a larger sigma for phase observations leads to better results shortly after program start. However, it may take more time till you finally get the best possible solution.</li>
    2586 <li>Introducing a larger sigma (lower accuracy) for code observations or a smaller sigma for phase observations may lead to less accurate results shortly after program start and thus a prolonged period of convergence but could provide better positions in the long run.</li>
    2587 </ul>
    2588 </p>
    2589 
    2590 <p><a name="pppeleweight"><h4>3.13.3.4 Elevation Depending Weighting - mandatory</h4></p>
     2585<li>Introducing a smaller sigma (higher accuracy) for code observations or a bigger sigma for phase observations leads to better results shortly after program start. However, it may take more time till you finally get the best possible solution.</li>
     2586<li>Introducing a bigger sigma (lower accuracy) for code observations or a smaller sigma for phase observations may lead to less accurate results shortly after program start and thus a prolonged period of convergence but could provide better positions in the long run.</li>
     2587</ul>
     2588</p>
     2589
     2590<p><a name="pppeleweight"><h4>3.13.3.4 Elevation Dependent Weighting - mandatory</h4></p>
     2591<p>
     2592BNC allows elevation dependent weighting when processing GNSS observations. A weight function
     2593</p>
     2594
     2595<p>&nbsp; &nbsp; &nbsp; P = cos&sup2; * z</p>
     2596
     2597<p>
     2598with 'z' being the zenith distance to the involved satellites can be applied instead of the simple weight function 'P = 1'.
     2599</p>
     2600<ul>
     2601<li>Tick 'Ele Wgt Code' if you want Elevation Dependant Weighting for code observations.</li>
     2602<li>Tick 'Ele Wgt Phase' if you want Elevation Dependant Weighting for phase observations.</li>
     2603</ul>
     2604<p>
     2605Default is using the plain weight function 'P = 1' for code and phase observations.
     2606</p>
    25912607
    25922608<p><a name="pppminobs"><h4>3.13.3.5 Minimum Number of Observations - mandatory</h4></p>
    … …  
    25962612<p><a name="pppwaitclockcorr"><h4>3.13.3.7 Wait for Clock Corrections - optional</h4></p>
    25972613<p>
    2598 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.
    2599 </p>
    2600 <p>
    2601 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.
     2614Zero 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.
     2615</p>
     2616<p>
     2617Using 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.
    26022618</p>
    26032619<p>
    … …  
    26102626</p>
    26112627<p>
    2612 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.
     2628This 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.
    26132629<p>
    26142630You 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.
    … …  
    26412657<p><a name="ppptimeseries"><h4>3.13.4.1 PPP Plot - optional</h4></p>
    26422658<p>
    2643 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.
     2659PPP 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.
    26442660</p>
    26452661<p>
    … …  
    26492665<p><a name="pppaudioresp"><h4>3.13.4.2 Audio Response - optional</h4></p>
    26502666<p>
    2651 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.
     2667For 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.
    26522668</p>
    26532669<p>
    … …  
    26612677<p><a name="ppptrackmap"><h4>3.13.4.3 Track Map - optional</h4></p>
    26622678<p>
    2663 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.
     2679You 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.
    26642680</p>
    26652681<p>
    … …  
    26672683</p>
    26682684<p>
    2669 The 'Open Map' button opens a windows showing a map according to the specified 'Google/OSM' option.
     2685The 'Open Map' button opens a windows showing a map according to the selected 'Google/OSM' option.
    26702686</p>
    26712687
    … …  
    26772693<p><a name="pppdotprop"><h4>3.13.4.4 Dot-properties - mandatory before pushing 'Open Map'</h4></p>
    26782694<p>
    2679 PPP tracks are presented on maps through plotting one colored dot per epoch.
     2695PPP tracks are presented on maps through plotting one colored dot per observation epoch.
    26802696</p>
    26812697
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