[aprssig] smartbeacon fast rate

[Wes Johnston, AI4PX]

Nope... corner pegging is disabled when your speed is > highspeed...
// Adjust beacon rate according to speed

       IF (speed > high_speed)
               beacon_rate = fast_beacon_rate;
       ELSE
               beacon_rate = fast_beacon_rate * high_speed / speed;

       // Corner pegging

       turn_threshold = turn_min + turn_slope / mph;

       IF (heading_change_since_beacon > turn_threshold) AND
          (secs_since_beacon> turn_time)
                 {

               secs_since_beacon = beacon_rate;
                 }
       }


The pseudo code is missing the open curly bracket after the IF (speed
> high_speed) line.... I'll see if I can dig around in the ham hud
code and verify this though....

This code says to me that if speed not > highspeed setting, set beacon
rate based on speed/time, set the turn threshold and check for heading
changes.

Wes


On 5/25/07, Tom Russo <russo at bogodyn.org> wrote:
> On Fri, May 25, 2007 at 10:07:42AM -0400, we recorded a bogon-computron collision of the <mckeehan at mckeehan.homeip.net> flavor, containing:
> > I picked the 60MPH for easy calculations :-)
> >
> > I did not realize until I saw this note that corner pegging is disabled above
> > the fast speed.
>
> It isn't, at least not in Xastir.  Xastir disables corner pegging below the
> slow speed.
>
> Above the high speed, the "min turn angle" is the turn threshold for corner
> pegging.  Between high and low speeds, the turn threshold is adjusted by
> the turn slope and speed (it is supposed to become less sensitive as speed
> decreases, i.e. higher turn threshold).
>
> It might be that other devices than xastir *do* disable corner pegging at
> high speed, too.  On the hamhud site:
>
> <http://www.hamhud.net/hh2/smartbeacon.html>
>
> the pseudocode fragment shows corner pegging working at all speeds above
> the low speed setting.  Xastir's implementation differs from this pseudo
> code only in that bit about the turn threshold --- the pseudocode shows
> turn_threshold always depending on speed, but xastir sets it to "turn_min"
> when above high speed, and uses the formula in the pseudocode only when
> between high and low speeds.
>
> --
> Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
> Tijeras, NM  QRPL#1592 K2#398  SOC#236 AHTB#1 http://kevan.org/brain.cgi?DDTNM
> "And, isn't sanity really just a one-trick pony anyway? I mean all you get is
> one trick, rational thinking, but when you're good and crazy, oooh, oooh,
> oooh, the sky is the limit!"  --- The Tick
>
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