LINE 1 Definition: col 1 symbol # col 2 version id a col 3 P/V mode flag V col 4- 7 year start 1993 col 9-10 month start _1 col 12-13 day of month start 29 col 15-16 hour start _0 col 18-19 minute start _0 col 21-31 second start _0.0000000 col 33-39 number of epochs _____96 col 41-45 data used ____d col 47-51 coordinate system ITR91 col 53-55 orbit type FIT col 57-60 agency name _JPL Sample: #aV1993 1 0 0 0.00000000 96 d ITR91 FIT JPL LINE 2 Definition: col 1- 2 symbols ## col 4- 7 GPS week _681 col 9-23 seconds of week 432000.00000000 col 25-38 epoch interval _900.00000000 col 40-44 mod. julian day start 49016 col 46-60 fractional day 0.0000000000000 Sample: ## 681 432000.00000000 900.00000000 49016 0.0000000000000 LINE 3 Definition: col 1- 2 symbols +_ col 5- 6 number of satelites 19 col 10-12 sat #1 id __1 col 13-15 sat #2 id __2 col 16-18 ..... 19-21 ..... etc ..... until col 58-60 sat #17 id _26 Sample: + 19 1 2 3 12 13 14 15 16 17 18 19 20 21 22 23 24 25 LINE 4-7 repeated with remaining sat IDs or zeros Sample: + 27 28 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 + 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 + 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 + 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 LINES 8-22 contain various unused field and comments
LINES 23 (epoch header record), generally every 15 minutes Definition: col 1- 2 symbols *_ col 4- 7 year start 1993 col 9-10 month start _1 col 12-13 day of month start 29 col 15-16 hour start _0 col 18-19 minute start _0 col 21-31 second start _0.00000000 Sample: * 1993 1 29 0 0 0.00000000 LINE 24 (position and clock record), repeated for each satellite Definition: col 1 symbol P col 2- 4 satellite id __1 col 5-18 x-coordinate (km) __14722.638510 col 19-32 y-coordinate (km) ___6464.319150 col 33-46 z-coordinate (km) _-21020.844810 col 47-60 clock (microsecond) _____-8.059218 LINE 25 (velocity and clock record), repeated for each satellite Definition: col 1 symbol V col 2- 4 satellite id __1 col 5-18 x-dot (decim/s) __-1196.628800 col 19-32 y-dot (decim/s) __26950.022500 col 33-46 z-dot (decim/s) ___7502.277100 col 47-60 cl rate (10e-4 msec/s) ______0.000000 Sample: P 1 14722.638510 6464.319150 -21020.844810 -8.059218 V 1 -1196.628800 26950.022500 7502.277100 0.000000 P 2 -24023.155300 -11843.563900 -1675.647210 -10.813964 V 2 -769.152700 -3247.508000 31255.023300 0.000000 P 3 2074.555420 19025.998840 17928.366120 -430.859048 V 3 -6873.932300 22421.664200 -23147.529600 0.000000 P 12 -6236.325580 13153.271260 -21964.100040 -108.945737 V 12 -27384.917100 6805.632800 12337.728800 0.000000 P 13 -13306.858100 4790.062110 -22360.523490 628.240251 V 13 9739.738600 -26864.612400 -11662.222500 0.000000 (repeated) . . . . . . . . P 27 -19350.820260 -4003.111190 17582.690790 14.651464 V 27 19491.879100 -11990.042400 18156.904400 0.000000 P 28 13316.378500 -13959.644490 18317.660940 52.520005 V 28 258.246400 23316.420800 17208.928500 0.000000 LINE 22 + number_epochs*(number_sats+1) + 1 (last line) Definition: col 1- 3 symbols EOF
© Chris Rizos, SNAP-UNSW, 1999