Galileo ephemeris report
The Galileo ephemeris report is sent when Command Packet 54h is used to request the ephemeris for one Galileo satellite or all Galileo satellites. The GETSVDATA SUBTYPE byte (byte 4) is set to eleven (11) to request the report. The following table shows the additional records provided in Report Packet 55h when Galileo ephemeris data is included.
The ephemeris data follows the standard defined by the Galileo ICD.
|
Subtype 11: Galileo ephemeris data |
||||
|---|---|---|---|---|
|
Byte |
Item |
Type |
Value |
Meaning |
|
6 |
DATA SOURCE |
1 (byte) |
|
Valid values are: 0: E1B 1: E5B 2: E5A |
|
7–8 |
WEEK NUMBER |
2 (bytes) |
|
GST, but with 1024 added for normal Galileo satellites so that the GST start epoch matches GPS. |
|
9–12 |
TOW |
4 (bytes) |
|
GST |
|
13–14 |
IODnav |
2 (bytes) |
|
Ephemeris and clock correction issue of data. |
|
15–18 |
TOE |
4 (bytes) |
Seconds |
|
|
19–26 |
CRS |
8 (double) |
Meters |
|
|
27–34 |
DELTA N |
8 (double) |
Semi-circles/sec |
|
|
35–42 |
MSUB0 |
8 (double) |
Semi-circles |
|
|
43–50 |
CUC/PI |
8 (double) |
Semi-circles |
The ICD value is in radians, so multiply by π to obtain radians. |
|
51–58 |
ECCENTRICITY |
8 (double) |
|
Dimensionless. |
|
59–66 |
CUS/PI |
8 (double) |
Semi-circles |
The ICD value is in radians, so multiply by π to obtain radians. |
|
67–74 |
SQRTA |
8 (double) |
Sqrt (meters) |
|
|
75–82 |
CIC/PI |
8 (double) |
Semi-circles |
The ICD value is in radians, so multiply by π to obtain radians. |
|
83–90 |
OMEGSUB0 |
8 (double) |
Semi-circles |
|
|
91–98 |
CIS/PI |
8 (double) |
Semi-circles |
The ICD value is in radians, so multiply by π to obtain radians. |
|
99–106 |
ISUB0 |
8 (double) |
Semi-circles |
|
|
107–114 |
CRC |
8 (double) |
Meters |
|
|
115–122 |
OMEGA |
8 (double) |
Semi-circles |
|
|
123–130 |
OMEGADOT |
8 (double) |
Semi-circles/sec |
|
|
131–138 |
IDOT |
8 (double) |
Semi-circles/sec |
|
|
149 |
SISA |
1 (byte) |
|
|
|
140–141 |
HSDVS |
2 (bytes) |
|
Signal Health Flag. |
|
142–145 |
TOC |
4 (bytes) |
|
E1, E5B for source E1B/E5B; E1, E5A for source E5A. |
|
146–153 |
AF0 |
8 (double) |
Seconds |
|
|
154–161 |
AF1 |
8 (double) |
s/s |
|
|
162–169 |
AF2 |
8 (double) |
s/s2 |
|
|
170–177 |
BGD1 |
8 (double) |
Seconds |
|
|
178 |
MODEL 1 |
1 (byte) |
|
Clock model for TOC/AF0–2/BGD1. |
|
179–186 |
BGD2 |
8 (double) |
Seconds |
|
|
187 |
MODEL 2 |
1 (byte) |
|
Clock model for BGD2. |
|
---------- End of Subtype 11 ---------- |
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