Novatel OM-20000053 Rev 2 WEPA/B WAAS Ephemeris

D Logs Summary
226 MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2
WEPA/B WAAS Ephemeris WAAS
The WEPA/B logs contain the WAAS satellite’s latest computed position, velocity and acceleration in ECEF
coordinates. See Figure D-2 The WGS84 ECEF Coordinate System on Page 187 for a pictorial representation
and definition of the ECEF coordinate system.
NOTE: These quantities are always referenced to the WGS-84 ellipsoid, regardless of the use of the DATUM
or USERDATUM commands.
WEPA
Structure:
Example:
$WEPA,35,417865.00,35,417728,122,147,15,2.4798730960000039E+007,
-3.408446000000005E+007,5.2980000000000053E+003,
2.4256250000000005E+000,2.5000000000000000E-003,
-1.488000000000000E+000,-1.250000000000000E-004,
-1.750000000000000E-004,0.0000000000000000E+000,
1.8626451492309570E-009,9.0949470177292823E-013*6D[CR][LF]
$WEPA week seconds wkephem secephem prn IOD acc
P-X P-Y P-Z V-X V-Y V-Z A-X A-Y A-Z agf1 agf2
Field # Field type Data Description Example
1$WEPA Log header $WEPA
2week GPS week number 35
3seconds GPS time of week (s) 417865.00
4wkephem GPS week number of ephemeris data 35
5secephem GPS seconds into the week at time of ephemeris data. 417728
6prn PRN of WAAS satellite 122
7IOD Issue of Data (IOD) of WAAS ephemeris (0-256) 147
8accuracy Accuracy of satellite 15
9P-x Satellite position’s X-coordinate (m) 2.4798730960000039E+007
10 P-y Satellite position’s Y-coordinate (m) -3.408446000000005E+007
11 P-z Satellite position’s Z-coordinate (m) 5.2980000000000053E+003
12 V-x Satellite velocity vector along X-axis (m/s) 2.4256250000000005E+000
13 V-y Satellite velocity vector along Y-axis (m/s) 2.5000000000000000E-003
14 V-z Satellite velocity vector along Z-axis (m/s) -1.488000000000000E+000
15 A-x Satellite acceleration vector along X-axis (m/s2)-1.250000000000000E-004
16 A-y Satellite acceleration vector along Y-axis (m/s2)-1.750000000000000E-004
17 A-z Satellite acceleration vector along Z-axis (m/s2)0.0000000000000000E+000
18 agf0 Clock corrections of WAAS satellite at time of
ephemeris data 1.8626451492309570E-009
19 agf1 Clock corrections of WAAS satellite at time of
ephemeris data 9.0949470177292823E-013
20 *xx Checksum *6D
21 [CR][LF] Sentence terminator [CR][LF]