1. Login to instrument:
ssh -X -l gpri2 192.168.1.7x
2. Check available disk space for data. The data are stored in their own disk partition called /data:
df /data
3. Move to the data directory
cd data
4. Initiate home run of the positioner (check first visually that the instrument can move freely and
the cables have enough room!):
home_run.py
The instrument is now looking at 0 degrees instrument azimuth angle. Angles increase
clockwise. Furthermore you may want to check system and gps status to make sure these
components are well attached and working:
chupa_status.py
tscc_status.py
gps_message.py
Temperatures should be below 50° and 2 lines of GPS messages should be shown.
5. Determine the start and stop angles for the scan by moving the antenna around. Be aware that
about 3 degrees are needed on both sides of the scan for rapid motion of 10 degrees/sec,
otherwise motion is at .5 deg/sec
move_abs.py -30
6. Create a directory for your site, e.g. the location name, and move into
mkdir Rosenlaui
cd Rosenlaui
7. Define the measurement parameters and setup the corresponding measurement profile. The
profile contains information on the transmitter chirp, angular scan, speed, and receiver
attenuation. See Table 1 for the description. Depending on the maximum range you want to
observe select the corresponding chirp rate in Section 6. (Table 2).
You can copy a template preference file from /usr/share/gpri/profiles. Its a good idea to give it a
descriptive name (site, name), especially if you do repeat measurements.
cp /usr/share/gpri/profiles/gpri_2ms.prf site_2ms.prf
8. Edit the profile to reflect your settings for IMA_atten_dB, STP_antenna_start,
STP_antenna_end and antenna_elevation. The setting TX_power must be “on” for
measurements, or “off” for listen only. Description of the values is given in Section 6.6.1 .
9. Run listen only first to check for other transmissions.
gpri2_capture_utc.py gpri_2ms.prf raw/20110714 \
1 now 1 -p slc/20110714 -m mli/20110714 \
-d 5 -r 10 -s .3 -e .5
10. Then display the processed data:
eog mli/20110714/20110714_083514*.ras
gpri2_plot.py gpri_2ms.prf raw/20110714/20110714_083514.raw
11. If no foreign signals are present start active measurement to derive gain settings (don't forget to
set power on in the prf file!):
gpri2_capture_utc.py gpri_2ms.prf raw/20110714 \
1 now 1 -p slc/20110714 -m mli/20110714 \
-d 5 -r 10 -s .3 -e .5
