sensors : add parameter for maximum flow rate

src/modules/sensors/sensor_params_flow.c

@@ -83,4 +83,17 @@ PARAM_DEFINE_FLOAT(SENS_FLOW_MINHGT, 0.7f);
  * @decimal 1
  * @group Sensor Calibration
  */
-PARAM_DEFINE_FLOAT(SENS_FLOW_MAXHGT, 3.0f);
+PARAM_DEFINE_FLOAT(SENS_FLOW_MAXHGT, 3.0f);
+
+/**
+ * Magnitude of maximum angular flow rate reliably measurable by the optical flow sensor.
+ * Optical flow data will not fused by the estimators if the magnitude of the flow rate exceeds this value and
+ * control loops will be instructed to limit ground speed such that the flow rate produced by movement over ground
+ * is less than 50% of this value.
+ *
+ * @unit rad/s
+ * @min 1.0
+ * @decimal 2
+ * @group Sensor Calibration
+ */
+PARAM_DEFINE_FLOAT(SENS_FLOW_MAXR, 2.5f);