ekf2: Add parameter to set range dependant noise

src/modules/ekf2/ekf2_params.c

@@ -577,6 +577,18 @@ PARAM_DEFINE_INT32(EKF2_HGT_MODE, 0);
  */
 PARAM_DEFINE_FLOAT(EKF2_RNG_NOISE, 0.1f);
 
+/**
+ * Range finder range depednat noise scaler.
+ *
+ * Specifies the increase in range finder noise with range.
+ *
+ * @group EKF2
+ * @min 0.0
+ * @max 0.2
+ * @unit m/m
+ */
+PARAM_DEFINE_FLOAT(EKF2_RNG_SFE, 0.05f);
+
 /**
  * Gate size for range finder fusion
  *