Research On The Technique And Application Of Flush Airdata Sensing System

Flush air data sensing (FADS) system uses a matrix of pressure sensors installed on the vehicle nose to measure the pressure of the vehicle surface, which can estimate flight parameters of air data sensing system indirectly. Compared with conventional air data sensing system, the system has greater advantages in the measuring accuracy, reliability and stealth capabilities. As a result, FADS system can be applied in different kinds of advanced vehicles. The FADS system application method (including it's principle, algorithms and engineering application) in many kinds of vehicles are systemically studied in this paper.Due to the special pneumatic layout and the stealth capabilities of flying wing vehicle, a kind of FADS system which pressure orifices instrumented both on the vehicle nosecap and on the wing leading edge are presented, the aerodynamic model of flying wing vehicle FADS system is introduced, then the airdata estimation algorithm and the failure detection model of pressure orifice are given. Because of the deficiency of traditional calibration method, another method using BP neural network is presented, numeral simulation resusts show it's good performance.Flying wing vehicle for it's longitudinal and lateral static stability are relaxed, it needs more accurate angle of attack and sideslip signal as feedback, so a method for measuring angle of attack and sideslip which using both FADS system and inertial navigation system (INS) is given to improve the system performance under maneuvering conditions. The simulation results show that a higher measurement precision of the angle of attack and sideslip can be got by using the combination system; it can meet the needs of engineering application.