Autopilot configuration reference: Difference between revisions

Autopilot configuration reference (view source)

851 bytes added , 4 September 2012

Describe moving-average and derivative filters

14

edits

@@ Line 442: / Line 442: @@
 </syntaxhighlight>
-=== <moving-average> ===
+=== Moving Average Filter <moving-average> ===
+Calculates average of specified number of values.
+Currently the average length can only be given as number of samples and not time.
+<syntaxhighlight lang="xml">
+ <filter>
+  <type>moving-average</type>
+  <samples>120</samples>
+  <input>/some/input</input>
+  <output>/some/output</output>
+ </filter>
+</syntaxhighlight>
 === Rate Limit Filter <noise-spike> ===
 A better name for a noise spike filter would probably have been "rate limit filter". This is exactly what it does: limit the rate of change of the output value. The relevant configuration element is <max-rate-of-change> setting the maximum rate of change of the output property per second.
@@ Line 466: / Line 478: @@
     <input>/engines/engine[0]/fuel-flow-pph</input>
     <output>/engines/engine[0]/fuel-flow-hpp</output>
+ </filter>
+</syntaxhighlight>
+=== Derivative Filter <derivative> ===
+Compute first time derivative of the input property, that is change per unit of time. Time is measured in seconds. A <filter-time> acts as gain and must be given because it has default 0.
+Example: compute derivative of static port pressure
+<syntaxhighlight lang="xml">
+ <filter>
+  <type>derivative</type>
+  <input>systems/static[0]/pressure-inhg</input>
+  <output>autopilot/internal/pressure-rate</output>
+  <filter-time>1.0</filter-time>
   </filter>
 </syntaxhighlight>