ashtech HDS800, Справочное руководство

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608
Data Output
SNV: GPS Ephemeris Data
This message contains the GPS ephemeris data for one
satellite.
The message is as follows:
$PASHR,SNV,<structure>
The message’s binary structure is described in the table
below.
Type Name Size Contents
Short Wn 2 GPS week number
Long Two 4 Seconds in GPS week
Float Tgd 4 Group delay (sec)
Long Aodc 4 Clock data issue
Long Toc 4 Clock data reference time (sec)
Float af2 4
Clock correction (sec/sec
2
)
Float af1 4 Clock correction (sec/sec)
Float af0 4 Clock correction (sec)
Long Aode 4 Orbit data issue
Float Dn 4 Mean anomaly correction (semicircles/sec)
Double M0 8 Mean anomaly at reference time (semicircles)
Double e 8 Eccentricity
Double
A
1/2
8
Square root of semi-major axis (meters
1/2
)
Long toe 4 Reference time for orbit (sec)
Float cic 4 Harmonic correction term (radians)
Float crc 4 Harmonic correction term (meters)
Float cis 4 Harmonic correction term (radians)
Float crs 4 Harmonic correction term (meters)
Float cuc 4 Harmonic correction term (radians)
Float cus 4 Harmonic correction term (meters)
Double omega0 8 Longitude of ascending node (semicircles)
Double omega 8 Argument of perigee (semicircles)
Double i0 8 Inclination angle (semicircles)
Float omega dot 4 Rate of right ascension (semicircles/sec)
Float I dot 4 Rate of inclination (semicircles/sec)
Short Accuracy 2 User range accuracy
Short Health 2 Satellite health
Short fit 2 Curve fit interval
Char prn 1 Satellite PRN number minus 1 (0-31)
Char 1 Reserved byte