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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
2 week GPS week number 35
3 seconds GPS time of week (s) 417865.00
4 wkephem GPS week number of ephemeris data 35
5 secephem GPS seconds into the week at time of ephemeris data. 417728
6 prn PRN of WAAS satellite 122
7 IOD Issue of Data (IOD) of WAAS ephemeris (0-256) 147
8 accuracy Accuracy of satellite 15
9 P-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/s
2
)
-1.250000000000000E-004
16 A-y
Satellite acceleration vector along Y-axis (m/s
2
)
-1.750000000000000E-004
17 A-z
Satellite acceleration vector along Z-axis (m/s
2
)
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]