The Time Delay Compensation Method for the Pressure Sensors of FADS

The flush airdata sensing system(FADS) works through a matrix of pressure sensors installed on each part of the vehicle.When the atmosphere density is quite low,the measuring accuracy of FADS is reducing and even can not work because of the too long time delay of the pressure sensors.The mechanism of the time delay caused by the pressure sensors is analyzed and the time delay compensation method of the phase-lead corrective network is presented.Selecting reasonably the parameters of the phase-lead corrective network and reducing suitably the length of the narrow tube combining the pressure sensors and the engine block surface can reduce the time delay of sensors effectively and increase the available airspace of FADS from 35km to 60km.The time delay compensation method of the phase-lead corrective network can achieve obvious effects and is easy to implement in engineering.