Saw: Sbas Almanac Data; Sng: Glonass Ephemeris Data - Magellan ProFlex 500 Reference Manual

SAW: SBAS Almanac Data

SNG: GLONASS Ephemeris Data

This message contains almanac data for one SBAS satellite.
The message is as follows:
$PASHR,SAW,<structure>
The message's binary structure is described in the table
below.
Type Name
char Id
char Health
long T0
float
float
long Tow
char Wn
char Prn
Check-
Unsigned short
sum
Total
This message contains the GLONASS ephemeris data for one
satellite.
The message is as follows:
$PASHR,SNG,<structure>
Size Contents
1 Data ID
Satellite Health&Status bitwise meaning is:
Bit0 – Ranging On(0), Off(1)
Bit1 – Corrections On(0), Off(1)
Bit2 – Broadcast Integrity On(0), Off(1)
Bit3 – Reserved
1 Bit4-7 – SBAS provider ID (0-15):
0 – WAAS,
1 – EGNOS,
2 – MSAS,
3-13 – Not assigned yet,
14-15 – Reserved
Almanac data reference time within the day
4
expressed in the SBAS time scale (seconds)
3*4 Satellite ECEF X,Y,Z coordinates (meters)
Satellite ECEF velocity X', Y', Z' coordinates
3*4
(m/s)
Time within week in GPS time scale when
4
SBAS almanac was received
Week number in GPS time scale modulo 256
1
when SBAS almanac was received
1 Satellite number (33 to 51)
The checksum is computed by breaking the
structure into 18 unsigned shorts, adding them
2
together, and taking the least significant 16
bits of the result.
38
Data Output
285