Changeset 2478 in ntrip


Ignore:
Timestamp:
May 8, 2010, 6:14:18 PM (7 years ago)
Author:
weber
Message:

More precise description of parameter 'Sigma code'

File:
1 edited

Legend:

Unmodified
Added
Removed
  • trunk/BNC/bnchelp.html

    r2476 r2478  
    11141114<p><a name="pppsigma"><h4>3.11.3 Sigma Code - mandatory if 'Use Phase Obs' is set</h4></p>
    11151115<p>
    1116 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.
    1117 As the convergence characteristic of a PPP solution can be influenced by the ratio of the sigmas for code and phase observations, you may like to introduce you own sigma for code observations which differs from the default of 5.0 m.
    1118 <ul>
    1119 <li>Introducing a smaller sigma (higher accuracy) for code observations leads to better results shortly after the program start. However, it may take more time till you finally get the best possible coordinates.</li>
    1120 <li>Introducing a higher sigma (lower accuracy) for code observations may lead to a prolonged convergence time but more rapidly provide the final accurate coordinates.</li>
    1121 </ul>
    1122 </p>
    1123 <p>
    1124 Note that only values between 0.3 m and 50.0 m are accepted as code sigma.
     1116When '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.
     1117As 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.
     1118<ul>
     1119<li>Introducing a smaller sigma (higher accuracy) for code observations leads to better results shortly after program start. However, it may take more time till you finally get the best possible solutions.</li>
     1120<li>Introducing a higher sigma (lower accuracy) for code 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>
     1121</ul>
     1122</p>
     1123<p>
     1124Note that the 'Sigma code' you enter must be greater than 0.3 m and less than 50.0 m.
    11251125</p>
    11261126
Note: See TracChangeset for help on using the changeset viewer.