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Data Output
SNW: SBAS Ephemeris Data
288
Type
Name
Size
Unsigned
Checksum
2
short
Total
76
This message contains the SBAS ephemeris data for one
satellite.
The message is as follows:
$PASHR,SNW,<structure>
The message's binary structure is described in the table
below.
Type
Name
char
-
char
accuracy
long
T0
double
float
float
float
aGf0
float
aGf1
long
tow
char
wn
char
prn
Unsigned
Checksum 2
short
Total
Contents
The checksum is computed by breaking the struc-
ture into 37 unsigned shorts, adding them
together, and taking the least significant 16 bits of
the result.
Size
Contents
1
Spare field
1
Accuracy
Ephemeris data reference time within the
4
day expressed in the SBAS time scale (sec-
onds)
3*8
Satellite ECEF X,Y,Z coordinates (meters)
Satellite ECEF velocity X', Y', Z' coordinates
3*4
(m/s)
3*4
Satellite ECEF acceleration X'',Y'',Z'' (m/s2)
Time offset between satellite time scale and
4
SBAS system time scale (seconds)
Time drift between satellite time scale and
4
SBAS system time scale (seconds)
Time within week in GPS time scale when
4
SBAS ephemeris was received
Week number in GPS time scale when
1
SBAS ephemeris was received
1
Satellite number (33 to 51)
The checksum is computed by breaking the
structure into 34 unsigned shorts, adding
them together, and taking the least signifi-
cant 16 bits of the result.
70
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