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Data Fields |
| unsigned | toe |
| | reference time ephemeris (0-604800) [s]
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| unsigned | toc |
| | reference time (clock) (0-604800) [s]
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| unsigned short | prn |
| | GPS PRN number.
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| unsigned short | week |
| | 10 bit gps week 0-1023 (user must account for week rollover ) [week]
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| unsigned short | iodc |
| | 10 bit issue of data (clock) []
|
| unsigned short | reserved1 |
| | reserved bytes
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| unsigned char | iode |
| | 8 bit issue of data (ephemeris) []
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| unsigned char | health |
| | 6 bit health parameter, 0 if healthy, unhealth othersize [0=healthy]
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| unsigned char | alert_flag |
| | 1 = URA may be worse than indicated [0,1]
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| unsigned char | anti_spoof |
| | anti-spoof flag from 0=off, 1=on [0,1]
|
| unsigned char | code_on_L2 |
| | 0=reserved, 1=P code on L2, 2=C/A on L2 [0,1,2]
|
| unsigned char | L2_P_data_flag |
| | flag indicating if P is on L2 1=true [0,1]
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| unsigned char | fit_interval_flag |
| | fit interval flag (four hour interval or longer) 0=4 fours, 1=greater [0,1]
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| unsigned char | ura |
| | User Range Accuracy lookup code, 0 is excellent, 15 is use at own risk [0-15], see p. 83 GPSICD200C.
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| unsigned short | age_of_data_offset |
| | age of data offset [s]
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| unsigned short | tow_week |
| | The week corresponding to tow (0-1024+). Can be one week larger than week. [week].
|
| unsigned | tow |
| | The time of week derived formt the Z-count in the Hand Over Word (HOW) [s].
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| double | tgd |
| | group delay [s]
|
| double | af2 |
| | polynomial clock correction coefficient (rate of clock drift) [s/s^2]
|
| double | af1 |
| | polynomial clock correction coefficient (clock drift) [s/s] Note: parameters from ephemeris preferred vs almanac (16 vs 11 bits)
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| double | af0 |
| | polynomial clock correction coefficient (clock bias) [s] Note: parameters from ephemeris preferred vs almanac (22 vs 11 bits)
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| double | m0 |
| | mean anomaly at reference time [rad]
|
| double | delta_n |
| | mean motion difference from computed value [rad/s]
|
| double | ecc |
| | eccentricity []
|
| 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 | i0 |
| | inclination angle at reference time [rad]
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| double | w |
| | argument of perigee [rad]
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| double | omegadot |
| | rate of right ascension [rad/s]
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| double | idot |
| | rate of inclination angle [rad/s]
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| double | cuc |
| | amplitude of the cosine harmonic correction term to the argument of latitude [rad]
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| double | cus |
| | amplitude of the sine harmonic correction term to the argument of latitude [rad]
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| double | crc |
| | amplitude of the cosine harmonic correction term to the orbit radius [m]
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| double | crs |
| | amplitude of the sine harmonic correction term to the orbit radius [m]
|
| double | cic |
| | amplitude of the cosine harmonic correction term to the angle of inclination [rad]
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| double | cis |
| | amplitude of the sine harmonic correction term to the angle of inclination [rad]
|