| Description |
GPS Ephemeris Data
|
| Notes |
|
| Parameter Name |
Data Type |
Description |
| Field Length |
u8 |
220 |
| Descriptor |
u8 |
0x61 |
|
Index
|
u8
|
Index of this field in this epoch. |
|
Count
|
u8
|
Total number of fields in this epoch. |
|
Time Of Week
|
double
|
GPS Time of week [seconds] |
|
Week Number
|
u16
|
GPS Week since 1980 [weeks] |
|
Satellite Id
|
u8
|
GNSS satellite id within the constellation. |
|
Health
|
u8
|
Satellite and signal health |
|
Iodc
|
u8
|
Issue of Data Clock. This increments each time the data changes and rolls over at 4. It is used to make sure various raw data elements from different sources line up correctly. |
|
Iode
|
u8
|
Issue of Data Ephemeris. |
|
T Oc
|
double
|
Reference time for clock data. |
|
Af0
|
double
|
Clock bias in [s]. |
|
Af1
|
double
|
Clock drift in [s/s]. |
|
Af2
|
double
|
Clock drift rate in [s/s^2]. |
|
T Gd
|
double
|
T Group Delay [s]. |
|
Isc L1ca
|
double
|
|
|
Isc L2c
|
double
|
|
|
T Oe
|
double
|
Reference time for ephemeris in [s]. |
|
A
|
double
|
Semi-major axis [m]. |
|
A Dot
|
double
|
Semi-major axis rate [m/s]. |
|
Mean Anomaly
|
double
|
[rad]. |
|
Delta Mean Motion
|
double
|
[rad]. |
|
Delta Mean Motion Dot
|
double
|
[rad/s]. |
|
Eccentricity
|
double
|
|
|
Argument Of Perigee
|
double
|
[rad]. |
|
Omega
|
double
|
Longitude of Ascending Node [rad]. |
|
Omega Dot
|
double
|
Rate of Right Ascension [rad/s]. |
|
Inclination
|
double
|
Inclination angle [rad]. |
|
Inclination Dot
|
double
|
Inclination angle rate of change [rad/s]. |
|
C Ic
|
double
|
Harmonic Correction Term. |
|
C Is
|
double
|
Harmonic Correction Term. |
|
C Uc
|
double
|
Harmonic Correction Term. |
|
C Us
|
double
|
Harmonic Correction Term. |
|
C Rc
|
double
|
Harmonic Correction Term. |
|
C Rs
|
double
|
Harmonic Correction Term. |
|
Valid Flags
|
u16 bitfield |
| Name |
Bit(s) |
Description |
| ephemeris |
0 |
|
| modern_data |
1 |
|
| flags |
0-1 |
|
|