Flush air data sensing system design for air breathing air-to-air missile

Abstract

The key technical difficulties and design flow of flush air data sensing (FADS) system design for air breathing air-to-air missile are analyzed. The aspirated air-to-air missile large slenderness than layout, high maneuverability, high angle of attack and low cost control characteristics proposed a high precision, multi-points of fault diagnosis and fault-tolerant and anti overload of fads system design method. Mainly includes the algorithm design based on strategy of pressure model, hierarchical diagnosis and multi-models of re-configurable fault-tolerant, the error source of the system control model design, high precision and anti overload pressure measurement module design and solution machine module design. According to the shape of a typical air breathing air-to-air missile, the FADS system principle prototype is designed, which is based on 9 pressure measuring points layout and flight Mach number 1.5–4.0. Prototype real-time solution test is done in 1.2 m×1.2 m supersonic wind tunnel. Test results show that: relative error of static pressure measurement is no more than 6.9%, measurement error of Mach number is no more than 0.10, the measurement errors of the angle of attack and side slip angle are no more than 1°. The measurement error of the reconstructed model is close to the baseline model error; algorithm fault diagnosis points is less than or equal to 3, the scope of fault diagnosis of P1 deviation is less than or equal to −20% or greater than or equal to 40%, P2–P9 deviation is less than or equal to −30% or greater than or equal to 30%. The algorithm has less than or equal to 2 fault tolerant ability. The measurement error level, fault diagnosis and tolerance ability of the system can meet the engineering requirements.