implemented mapping between desired thrust and applied pwm in

multirotor mixer.

Signed-off-by: Roman <bapstroman@gmail.com>

src/modules/sensors/sensor_params.c

@@ -3277,6 +3277,18 @@ PARAM_DEFINE_INT32(PWM_AUX_MAX, 2000);
  */
 PARAM_DEFINE_INT32(PWM_AUX_DISARMED, 1500);
 
+/**
+ * Thrust to PWM model parameter
+ *
+ * Parameter used to model the relationship between static thrust and motor
+ * input PWM. Model is: thrust = (1-factor)*PWM + factor * PWM^2
+ *
+ * @min 0.0
+ * @max 1.0
+ * @group PWM Outputs
+ */
+PARAM_DEFINE_FLOAT(THR_MDL_FAC, 0.65f);
+
 /**
  * Minimum motor rise time (slew rate limit).
  *