Changeset 1300 in ntrip

Timestamp:

Dec 15, 2008, 2:51:19 PM (15 years ago)

Author:

weber

Message:

* empty log message *

File:

• trunk/BNC/bnchelp.html (modified) (1 diff)

trunk/BNC/bnchelp.html

@@ -460 +460 @@
 RTCM Version 3 streams carrying these messages may be used i.e. to support real-time Precise Point Positioning (PPP) applications. 
 </p>
+<p>
+When using clocks from Broadcast Ephemeris (with or without corrections) and clocks from SP3 files in the same application, it is important to understand that Broadcast Ephemeris clocks - according to the Interface Control Documents (ICD) - are corrected for the 2nd-order relativistic effect whereas clocks from SP3 files are not. The 2nd-order relativistic effect is a priodic time correction defined as -2 (R * V) / c^2 and includes the scalar product of satallite position and velocity divided by the speed of light raised to the second power.
+</p>
 
 <p><a name="corrdir"><h4>3.8.1 Directory - optional</h4></p>