Almanac Decoded Almanac - Novatel EuroPak-15ab User Manual

Data Logs
6.3.2

ALMANAC Decoded Almanac

This log contains the decoded almanac parameters for the frequency specified in the POSITIONTYPE
command, see Page 64. Multiple messages are transmitted, one for each SV almanac collected. For more
information on Almanac data, refer to the GPS SPS Signal Specification. A list of standards and references
with contact information can be found in the GPS+ Reference Manual available on our website at
www.novatel.com/support/docupdates.htm.
Log Type: Asynch
Field
Field
Name
1 header
2 #msg
3 PRN
4 week
5 seconds
6 ecc
ω °
7
ω
8
0
ω
9
10 M
o
a
11
fo
a
12
f1
13 N
14 A
15 incl-angle
16 SV config
17 health-prn
18 health-alm
19 antispoof
20... Next almanac data set, offset = H + 4 + (# previous msg x 112)
21 32-bit CRC (ASCII and Binary only)
EuroPak-15ab Receiver User Manual Rev 1
Description
This field contains the message header, in ASCII or Binary format.
See Section 4.3 on Page 38.
The number of satellite PRN almanac data sets to follow.
Satellite PRN number for current message, dimensionless
Almanac reference week (GPS week number)
Almanac reference time, seconds into the week
Eccentricity, dimensionless
Rate of right ascension, radians/second
Right ascension, radians
Argument of perigee, radians
Mean anomaly of reference time, radians
Clock aging parameter, seconds
Clock aging parameter, seconds/second
Corrected mean motion, radians/second
Semi-major axis, meters
Angle of inclination relative to 0.3 π, radians
Satellite configuration
SV health from subframe 4 or 5
SV health from almanac
Anti-spoofing flag, see Table 34 on Page 78
Chapter 6
http://
Message ID: 73
Binary Binary
Format
Bytes Offset
H 0
Long 4 H
ULong 4 H+4
ULong 4 H+8
Double 8 H+12
Double 8 H+20
Double 8 H+28
Double 8 H+36
Double 8 H+44
Double 8 H+52
Double 8 H+60
Double 8 H+68
Double 8 H+76
Double 8 H+84
Double 8 H+92
ULong 4 H+100
ULong 4 H+104
ULong 4 H+108
Enum 4 H+112
H + 4 +
(112 x
Hex 4
#msg)
77