Rohde & Schwarz SMBV-P101, Руководство пользователя

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About the GNSS Production Tester
R&S
®
SMBV-P101
15 User Manual 1176.9787.02 ─ 05
3.3 Signal Dynamics
For basic receiver testing, the R&S SMBV production tester generates signals with
varying Doppler effects. Thus you can define Doppler profiles with configurable maxi-
mum dynamics (velocity, acceleration and jerk).
3.4 Modulation Control
The instrument allows you to disable modulation components individually, like data
source, spreading code, time sequence, meandering, navigation message, etc.
3.5 Multiple Almanacs
The instrument supports the configuration of the almanac files used. One almanac file
per GNSS navigation standard can be selected.
The Galileo and Beidou satellite constellation are not yet fully in orbit. Hence, no alma-
nac files for Galileo and BeiDou are available. In this implementation, predicted Galileo
and Beidou almanac files are provided for test purposes. The almanac files for GPS
and Galileo use the same format.
Current GNSS almanac data can be downloaded via the Internet and stored on the
hard disk of the instrument:
●
U.S.Coast Guard Navigation Center GPS Homepage http://
www.navcen.uscg.gov/?pageName=gpsAlmanacs
The almanac files are named
xxx.alm
(for YUMA files) or
xxx.al3
(for SEM
files),
where xxx denotes the day of a year
●
http://www.celestrak.com/GPS/almanac/
The naming convention of the almanac file is:
almanac.sem/
yuma.weekXXXX.YYYYYY.txt
,
where
xxxx
denotes the GPS week and
yyyyyy
the time of almanac (TOA).
●
ftp://ftp.glonass-iac.ru/MCC/ALMANAC/
The file extension of the Glonass almanac file is:
xxx.agl
For detailed information on the content and frame structure of navigation data, refer to
the specifications.
3.6 Power Configuration
The instrument employs a dynamic power control concept for dynamical configuration
of the power of each satellite separately and manually.
Power Configuration