|
Data Fields |
| unsigned | toa |
| | almanac time of applicability (reference time) [s]
|
| unsigned short | week |
| | 10 bit gps week 0-1023 (user must account for week rollover) [week]
|
| unsigned short | prn |
| | GPS prn number [].
|
| unsigned short | reserved |
| | reserved
|
| unsigned short | svn |
| | Satellite vehicle number [].
|
| unsigned char | ura |
| | User Range Accuracy lookup code, [0-15], see p. 83 GPSICD200C, 0 is excellent, 15 is use at own risk.
|
| unsigned char | health |
| | 0=healthy, unhealthy otherwise [], subframe 4 and 5, page 25 six-bit health code
|
| unsigned char | config_code |
| | configuration code [], if >=9 Anti-Spoofing is on
|
| unsigned char | is_af0_af1_high_precision |
| | indicates precision of af0 and af1 [1=high precision,0=low precision] (22&16 bits, ephemeris source) vs (11&11 bits, almanac source), 0 is typical for most SEM sources
|
| double | ecc |
| | eccentricity []
|
| double | i0 |
| | orbital inclination at reference time [rad]
|
| double | omegadot |
| | rate of right ascension [rad/s]
|
| double | sqrta |
| | square root of the semi-major axis [m^(1/2)]
|
| double | omega0 |
| | longitude of ascending node of orbit plane at weekly epoch [rad]
|
| double | w |
| | argument of perigee [rad]
|
| double | m0 |
| | mean anomaly at reference time [rad]
|
| double | af0 |
| | polynomial clock correction coefficient (clock bias) [s], Note: parameters from ephemeris preferred vs almanac (22 vs 11 bits)
|
| double | af1 |
| | polynomial clock correction coefficient (clock drift) [s/s], Note: parameters from ephemeris preferred vs almanac (16 vs 11 bits)
|