#include STL_STRING
#include <vector>
+#include <deque>
SG_USING_STD(string);
SG_USING_STD(vector);
+SG_USING_STD(deque);
#include <simgear/props/props.hxx>
#include <simgear/structure/subsystem_mgr.hxx>
// Input values
double y_n; // measured process value
double r_n; // reference (set point) value
+ double y_scale; // scale process input from property system
+ double r_scale; // scale reference input from property system
// Configuration values
double Kp; // proportional gain
// Input values
double y_n; // measured process value
double r_n; // reference (set point) value
+ double y_scale; // scale process input from property system
+ double r_scale; // scale reference input from property system
double u_min; // Minimum output clamp
double u_max; // Maximum output clamp
};
+/**
+ * FGDigitalFilter - a selection of digital filters
+ *
+ * Exponential filter
+ * Double exponential filter
+ * Moving average filter
+ * Noise spike filter
+ *
+ * All these filters are low-pass filters.
+ *
+ */
+
+class FGDigitalFilter : public FGXMLAutoComponent
+{
+private:
+ double Tf; // Filter time [s]
+ unsigned int samples; // Number of input samples to average
+ double rateOfChange; // The maximum allowable rate of change [1/s]
+ deque <double> output;
+ deque <double> input;
+ string filterType;
+
+ bool debug;
+
+public:
+ FGDigitalFilter(SGPropertyNode *node);
+ ~FGDigitalFilter() {}
+
+ void update(double dt);
+};
+
/**
* Model an autopilot system.
*