Specifications
144 Z-Family Technical Reference Manual
SNV: Ephemeris Data
$PASHQ,SNV,c
Request ephemeris data from receiver, where c is either the optional output serial or
the specific PRN number. If either the port is specified, or if this field is left blank, the
ephemeris structures for all available SVs will be output.
Example: Send out SNAV data for all available SVs to the current port.
$PASHQ,SNV <enter>
Send out SNAV data for PRN 10
$PASHQ,SNV,10 <enter>
$PASHR,SNV
The response is in the form:
$PASHR,SNV,<ephemeris structure> <enter>
This message only exists in binary format. If ASCII format is requested (default), only the header
will be sent ($PASHR,SNV).
Table 6.77 describes the binary structure of the SNAV message.
Table 6.77: SNV Message Structure
Type Size Contents
short 2 Wn. GPS week number
long 4 Seconds of GPS week
float 4 Tgd. Group delay (sec)
long 4 Iodc. Clock data issue
long 4 toc. second
float 4 af2. sec/sec2
float 4 af1. sec/sec
float 4 af0. sec
long 4 IODE Orbit data issue
float 4
∆n. Mean anomaly correction (semi-circle/sec)
double 8 M0. Mean anomaly at reference time (semi-circle).
double 8 e. Eccentricity
double 8 (A)1/2. Square root of semi-major axis (meters 1/2).