Frequently asked questions for the orbit accuracy's

What do the tables of errors of WAAS orbit show?

The tables show same statistics as for brodcast orbit (see Calculation). The diffences are only that result values are computed using thee different approaches:

using all satellite positions computed using broadcast ephemerides only during whole day
using all satellite positions computed using broadcast ephemerides and WAAS corrections during whole day,
using satellite position only when IODE number of WAAS corrections is equal to IODE number in broadcast ephemerides

and therefore there are three lines for each satellite in output the table. The output tables are available in WGS-84 and satellite fixed (R, S, W) coordinate system. What do the plots of errors of WAAS orbit show?

The tables show time error series of WAAS orbit, i.e. error of all used positions for particular satellite. Except errors where the violet line is showing value of sigma_flt.

There are hashed areas in the plots. With cyan color time interval when IODE number of correction does not correspond to IDE of broadcast ephemerides is hashed. Yellow color is used for time interval when UDRE indicator in WAAS message is set to do not use or not monitored.

Plots are made for both used coordinate systems.