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EuroPak-15a Receiver User Manual Rev 5
Chapter 6
Data Logs
6.3.6
RAWEPHEM
Raw Ephemeris
This log contains the raw binary information for subframes one, two and three from a satellite with the parity
information removed. Each subframe is 240 bits long (10 words - 24 bits each) and the log contains a total 720
bits (90 bytes) of information (240 bits x 3 subframes). This information is preceded by the PRN number of the
satellite from which it originated. This message is not generated unless all 10 words from all 3 frames have
passed parity.
Ephemeris data whose Time Of Ephemeris (TOE) is older than six hours is not shown.
Log Type: Asynch
Message ID: 41
Recommended Input:
LOG RAWEPHEMA ONCHANGED
Example Output:
#RAWEPHEMA,COM1,7,76.5,SATTIME,338,338430.000,00A00000,0000,33331;
29,338,345600,8B05486E2B255490003CD3E8731DDB8A24F57C45F225546000006
946137A0000000000,8B05486E2BA8250A4E2BB771090CD2097204D3A7FB1250A10
D95B354607D000000B2EA,8B05486E2C2F0072ADE5E6AE005C2829DA2F1B93D8620
667FFAAFC250D9A0000000000*D413845E
...
#RAWEPHEMA,COM1,4,76.5,SATTIME,338,338430.000,00A00000,0000,33331;
10,338,345584,8B05486E2B255490003CD3E8731DDB8A24F57C45FB94545F00000
50A52E70000000000,8B05486E2BA894FC2A2D01670FCEA8FCC0039DF4691822A10
C7F8E545F2B000000B2EA,8B05486E2C2FFFBA8488C0FDFFD127BDA71614E90FD78
438FFABE494F11E0000000000*6854985A
...
#RAWEPHEMA,COM1,0,76.5,SATTIME,338,338430.000,00A00000,0000,33331;
15,338,345600,8B05486E2B255492012CD3E8731DDB8A24F57C45FB56546000003
44A40460000000000,8B05486E2BA856FD4936E4E87361D4FD2F04D0F1270900A10
DA76554607C000000B2EA,8B05486E2C2FFFFD5C183A3FFFBE27061AC724B767F70
A30FFA2F056FDD40000000000*71B1AC43
Field
Field Name
Description
Format
Binary
Bytes
Binary
Offset
1
header
This field contains the message header, in
ASCII
or
Binary
format. See
.
H
0
2
prn
Satellite PRN number
Ulong
4
H
3
ref week
Ephemeris reference week number
Ulong
4
H+4
4
ref secs
Ephemeris reference time (seconds.)
Ulong
4
H+8
5
subframe1
Subframe 1 data.
Hex
30
H+12
6
subframe2
Subframe 2 data.
Hex
30
H+42
7
subframe3
Subframe 3 data.
Hex
32
H+72
8
32-bit CRC (
ASCII
and
Binary
only)
Hex
4
H+104
