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* lib: add FilteredDerivative class * AirspeedValidator: add first principle check - filters throttle, pitch and airspeed rate, and triggers if the airspeed rate is negative even though the vehicle is pitching down and giving high throttle. Check has to fail for duration defined by ASPD_FP_T_WINDOW to trigger an airspeed failure. * AirspeedValidator: define constants for first principle check * FilteredDerivative: set initialised to false if sample interval is invalid * airspeed_selector: improved comment * increase IAS derivative filter time constant from 4 to 5 * use legacy parameter handling for FW_PSP_OFF * handle FW_THR_MAX as well * ROMFS/airframes: exclude some airframes for v6x and v4pro to save flash on them --------- Signed-off-by: Silvan Fuhrer <silvan@auterion.com> Signed-off-by: RomanBapst <bapstroman@gmail.com> Co-authored-by: Silvan Fuhrer <silvan@auterion.com>