Spectracom GSG-5 series, User Manual With Scpi Manual

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The scenario is restricted to start times within this range. If a scenario runs beyond this range of
time, no new satellites will be added. If the user specifies a start time outside this range, a dia
log will advise the user that the ephemeris and almanac are dates are mismatched. The SCPI
error “
Data out of range " will be logged to indicate this issue for remote control users.
CNAV
You can also provide a file with
CNAV
messages to be used with GPS and QZSS L2C and L5.
The file extension is .cnt (CNAV train), and the file is satellite-specific. The file name conventions
are:
PRN<satid>_y<4digityear>_d<dayofyear>_h<hourofday>.cnt
e.g., PRNG01_y2013_d105_h14.cnt.
Each row of the file should contain:
satSys(A1), satid (I2), 1X, year (I2), 1X, month (I2),
1X, date (I2), 1X, hour (I2), 1X, min(I2), 1X, sec (I2),
1X, msgid (I2), 1X, [optional] hexmsg (A76)
E x a m p l e :
G01 13 04 15 14 00 00 11 8B04B4ED919863A6671F473A31412695EFF3C
026C0209FF07D601F775FEFE1FF987800000000
The
hexmsg
part is optional, and if not provided, it will be generated by GSG. This enables
for users to specify only the order of messages.
The messages are used in a circular manner, i.e. after the last message is sent, the first message
will be sent again. The starting message is selected based on scenario start time, i.e., it can be
one of the middle messages in case scenario starts later than the time of the first message.
Since the same file is used for L2C and L5 message trains which have different message dur
ation, only the timestamp of the first message is relevant to decide the starting message. The
week number and tow, as well as CRC, are recalculated by GSG.
SBAS
SBAS message files must follow the following file naming conventions so that GSG can recog
nize them:
For EGNOS:
PRN*.ems
For WAAS:
Geo*
SBAS message files do not need to be transformed to the scenario date as all timing is relative,
i.e. a message file downloaded for a particular date can be used also with any other scenario
start date.
ANTEX
48
CHAPTER
3
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User Manual GSG-5/6 Series Rev. 26
3.5 "Select" Menu