Fixed-wing autoland: Remove the dynamic altitude acceptance calculation and just use a simple separate landing altitude acceptance radius instead. This gives users that do not use LOITER-TO-ALT waypoints more control over their landing procedure

src/modules/navigator/navigator_params.c

@@ -83,6 +83,20 @@ PARAM_DEFINE_FLOAT(NAV_ACC_RAD, 10.0f);
  */
 PARAM_DEFINE_FLOAT(NAV_FW_ALT_RAD, 10.0f);
 
+/**
+ * FW Altitude Acceptance Radius before a landing
+ *
+ * Altitude acceptance used for the last waypoint before a fixed-wing landing. This is usually smaller
+ * than the standard vertical acceptance because close to the ground higher accuracy is required.
+ *
+ * @unit m
+ * @min 0.05
+ * @max 200.0
+ * @decimal 1
+ * @group Mission
+ */
+PARAM_DEFINE_FLOAT(NAV_FW_ALTL_RAD, 5.0f);
+
 /**
  * MC Altitude Acceptance Radius
  *