Spectracom GSG-5 series, User Manual With Scpi Manual

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GPS-703-GGG : Gain pattern approximates Novatel’s GPS-703-GGG antenna with max
imum gain of +5.7 dBic. See
www.novatel.com
for details.
The format used to describe gain patterns is the FEKO pattern file format version 6.1, Far Field
format, File Format 2.0. Gain patterns for various frequencies are to be included in the same
file as separate Solution Blocks. The GSG units expect the result type to be either
Gain or Dir
ectivity , and enforces a maximum value of 50 for the No. of Theta/Phi Samples, with 36 as the
recommended choice yielding a 5/10 degree resolution on elevation/azimuth.
The first line of the antenna file is expected to define the File Type. The GSG defines phi 0
degrees, i.e. the x-axis of phi, to point towards the north direction.
3.5.8.2 Lever arm
A lever arm can be specified to separate the antenna position from the body mass center of
the vehicle: All trajectory movements in the simulation will act on the body mass center of the
vehicle. By default the antenna is located in this the body mass center position, pointing
upward. To specify that the receiver antenna is
not
located in the body mass center position, a
lever arm can be configured.
The lever arm settings specify the relative position change in the form of (x, y, z) along the
body axis of the vehicle frame, where the coordinate system XYZ is aligned with the body mass
center frame. At the start of a scenario, the X-axis corresponds to the east/west axes of the
ENU frame
and the nose is pointing to the north.
The X-axis has a positive direction towards the right side of the sensor. The Y-axis has a pos
itive direction towards the front of the sensor. The Z-axis has a positive direction towards the
top of the sensor.
For more information on vehicle modeling, see "Environment models" on page 64.
3.5.8.3 Elevation mask
The elevation mask specifies how low GNSS satellites will be simulated. The elevation mask is
set to zero by default.
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User Manual GSG-5/6 Series Rev. 26
3.5 "Select" Menu