===== Radar-system =====

The radar-system uses only one radio-platform, and the setup is similar to
<ref>sub:Radio-system</ref>.

==== Hardware-setup ====

For this setup, the duplicator is not needed, and only two RF-cards are
necessary. Align the two antennas, so that they point
in the direction of the object. If possible, the player should be behind the
antennas, so that his movement is hidden to
the radar. Else it is difficult to tell apart the movement of the player with
the movement of the object.

<figure>en:research:sr:manuel:radar-setup|Radar-system|cap:Radar-system</figure>

==== Software-setup ====

Be sure to have the correct code loaded into the FPGA, else refer to
<ref>sec:FPGA</ref> on how to program the correct code.

When everything is set up, you can start the radio on the software-platform:

<code>
cd $SRADIO/Test/Radar
make rf_tail
</code>

Then, on a computer connected to the software-platform, connect the camera, make
sure it is detected, and run:

<code>
cd $SRADIO/Tools/PlayRadar
./run
</code>

Eventually you have to adjust the following two variables:

<ldl>
<ldt>REMOTE</ldt><ldd>points to the software-radio platform</ldd>
<ldt>RADIO_DIR</ldt><ldd>is the remote directory</ldd>
</ldl>

==== Camera-setup ====

For this radar-system you can have a camera attached to the computer, so that
the different people using the system can be
shown live! Unfortunatly, this requires some setup to your computer. The source
code for the driver can be found under:

<code>
http://www.saillard.org/linux/pwc/debian/
</code>

and once it is installed, things should run nicely.

==== Amplitude settings ====

The amplitude settings are done in case the two antennas are 1m apart and on the
same height, pointing in the same direction.
If you chose to use them in a different setting, it can be necessary to adjust
the values //attn_rx// and //attn_tx//
in the file //\$SRADIO/Test/Radar/test_radar.c// to more convenient values.
Lower
values mean lower attenuations. So if you put
the antennas further apart, it may be useful to chose a lower value for
//attn_rx//.

You can also run

<code>
cd \$SRADIO/Test/Radar
make rf_show
</code>

and use the configuration-window from the //radar_rf//-module while looking
at the output of //radar_rf// and the
//fft//-stats of the //radar_fft//-module. Once you find a good pair of
values where the output shows a dotted circle
and the fft shows a clean peak, copy these values to //test_radar.c// and
re-run it.