ashtech ZY-12 Information Supplement page 95

Table 4.8. $PASHR,PBN Message Structure (ASCII) (continued)
Parameter
m6 Longitude in degrees and decimal minutes
(dddmm.mmmmmm) Positive east.
f7 Altitude (meters)
f8 Velocity in ECEF-X (m/sec).
f9 Velocity in ECEF-Y (m/sec).
f10 Velocity in ECEF-Z (m/sec).
d11 Number of satellites used for position computation.
s12 Site name
d13 PDOP
d14 HDOP
d15 VDOP
d16 TDOP
SNAV Message
The SNAV message contains satellite ephemeris data, including values for orbital
parameters, satellite health status, clock corrections, etc. SNAV is output in binary
format only. One message is output for each satellite being tracked. Table 4.9
below outlines the contents of the SNAV message.
The structure of the SNAV message is shown below:
$PASHR,SNV,<Ephemeris Data + Checksum>
Table 4.9. $PASHR,SNV Message Structure
Binary Type
short
long
float
long
long
float
float
Serial Port Output
Description
Size
2 Wn. GPS week number
4 Seconds of GPS week
4 Tgd. Group delay (sec)
4 IODC. Clock data issue
4 toc. second
4 af2. sec/sec2 (clock correction)
4 af1. sec/sec (clock correction)
Range
±180
±99999.999
±999.99
±999.99
±999.99
3 -12
4 character
string
0 - 99
0 - 99
0 - 99
0 - 99
Contents
89