QZSSALMANAC
Decoded QZSS Almanac parameters
|
Platform: |
OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7, SMART2 |
This log contains the decoded L1 C/A almanac parameters as received from the satellite with the parity information removed and appropriate scaling applied.
The OEM7 family of receivers automatically save almanacs in their Non-Volatile Memory (NVM), so creating an almanac boot file is not necessary.
For more information about QZSS almanac data, refer to the Interface Specifications for QZSS at http://qzss.go.jp/en/technical/ps-is-qzss/ps-is-qzss.html.
Message ID: 1346
Log Type: Asynch
Recommended Input:
log qzssalmanaca onchanged
ASCII Example:
#QZSSALMANACA,USB1,0,52.0,SATTIME,2209,435870.000,02000020,67d2,16809;4,
194,2210,86016.0,7.608324e-02,-2.30866759e-09,5.57636471e-01,-1.5856923e+00,
-2.8557607e+00,0.00000000,0.00000000,7.29378066e-05,4.2157755e+07,
7.30630256e-01,0,0,195,2210,86016.0,7.458836e-02,-2.59439378e-09,2.2676078e+00,
-1.5598701e+00,1.6893387e+00,-1.90734863e-06,0.00000000,7.29131785e-05,
4.2167248e+07,7.11593314e-01,0,0,196,2210,86016.0,7.522970e-02,-3.50871758e-09,
-2.2752950e+00,-1.5559876e+00,-9.89514980e-02,1.02043152e-04,3.63797881e-12,
7.29238543e-05,4.2163133e+07,6.00026173e-01,0,0,199,2210,86016.0,2.670288e-04,
9.60039990e-10,-1.6991414e+00,-1.1489437e+00,-1.2297942e+00,0.00000000,
0.00000000,7.29167972e-05,4.2165853e+07,1.21040672e-03,0,0*37178436
The speed at which the receiver locates and locks onto new satellites is improved if the receiver has approximate time and position (SETAPPROXTIME and SETAPPROXPOS), as well as an almanac. This allows the receiver to compute the elevation of each satellite so it can tell which satellites are visible and their Doppler offsets, improving Time to First Fix (TTFF).
|
Field |
Field Type |
Description |
Format |
Binary Bytes |
Binary Offset |
|
1 |
Log header |
QZSSALMANAC header For information about log headers, see ASCII, Abbreviated ASCII or Binary. |
|
H |
0 |
|
2 |
#messages |
Number of satellite PRN almanac messages to follow. Set to zero until almanac data is available |
Ulong |
4 |
H |
|
3 |
PRN |
Satellite PRN number for current message (dimensionless) |
Ulong |
4 |
H+4 |
|
4 |
week |
Almanac reference week (GPS reference week number) |
Ulong |
4 |
H+8 |
|
5 |
seconds |
Almanac reference time (s) |
Double |
8 |
H+12 |
|
6 |
ecc |
Eccentricity (dimensionless) |
Double |
8 |
H+20 |
|
7 |
ώ |
Rate of right ascension (radians/s) |
Double |
8 |
H+28 |
|
8 |
ω0 |
Right, ascension (radians) |
Double |
8 |
H+36 |
|
9 |
ω |
Argument of perigee (radians) |
Double |
8 |
H+44 |
|
10 |
M0 |
Mean anomaly of reference time (radians) |
Double |
8 |
H+52 |
|
11 |
af0 |
Clock aging parameter (s) |
Double |
8 |
H+60 |
|
12 |
af1 |
Clock aging parameter (s/s) |
Double |
8 |
H+68 |
|
13 |
N |
Corrected mean motion (radians/s) |
Double |
8 |
H+76 |
|
14 |
A |
Semi-major axis (m) |
Double |
8 |
H+84 |
|
15 |
inclination angle |
Angle of inclination |
Double |
8 |
H+92 |
|
16 |
health-prn |
SV health from Page 25 of subframe 4 or 5 (6 bits) |
Ulong |
4 |
H+100 |
|
17 |
health-alm |
SV health from almanac (8 bits) |
Ulong |
4 |
H+104 |
|
18 |
Next PRN offset = H+4+(#messages x 104) |
||||
|
19 |
xxxx |
32-bit CRC (ASCII and Binary only) |
Ulong |
4 |
H+4+ |
|
20 |
[CR][LF] |
Sentence terminator (ASCII only) |
- |
- |
- |