Re: [Paparazzi-devel] About follow?

[Pascal]

Yves Touchette wrote:

> Can someone tell me how follow works?
>
> Does it assume that the aircraft see each others telemetry data to 
> know where the other plane is?


No, the current assumption is that traffic information (position, 
altitude about other aircraft) comes
from the ground station: ACINFO messages are uplinked periodically from the
ground station to the aircraft.

> Or is it the ground station that tell the aircraft in follow mode 
> where the aircraft it's following is?
>
> In any case, I tryed to run a simulation with twin1 using the 
> muret_follow.xml flight plan, but it's not compiling... In function 
> auto_nav: undefined reference to get_ac_info...

I get the following example compiling and running ("follow" block for 
Twin2)

conf.xml:

 <aircraft
   name="Twin1"
   ac_id="1"
   airframe="airframes/twinstar1.xml"
   radio="radios/cockpitMM.xml"
   flight_plan="flight_plans/mav05_cw.xml"
   telemetry="telemetry/default.xml"
   settings="settings/tuning_rc.xml"
   gui_color="blue"
 />

 <aircraft
   name="Twin2"
   ac_id="2"
   airframe="airframes/twinstar2.xml"
   radio="radios/cockpitMM.xml"
   flight_plan="flight_plans/mav05_ccw.xml"
   telemetry="telemetry/default.xml"
   gui_color="#800080"
 />



control_panel.xml:

   <session name="Sim address@hidden">
     <variable name="map" value="garmisch.xml"/>
     <program name="server"/>    
     <program name="gaia"/>
     <program name="sim"><arg flag="-a" constant="Twin1"/></program>
     <program name="sim"><arg flag="-a" constant="Twin2"/></program>
     <program name="cockpit"></program>
     <program name="map 2d ml"/>
     <program name="messages"><arg flag="-c" 
constant="telemetry:*"/><arg flag="-c" constant="ground"/></program>
   </session>



--Pascal

> The twinstar1.xml has ap.EXTRA_SRCS += traffic_info.c, but for some 
> reason it doesn't get compiled. The build system is pretty complex, so 
> I must be missing something...
>
> Can someone give me some pointers as to what I might be doing wrong?
>
> -yvest
>
>
>
>
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