Method for estimating flight attack angle based on dimensionality reduction state observer
A technology of state observer and observer, which is applied in the field of estimating the flight angle of attack of aircraft or missiles, can solve the problem that the flight angle of attack cannot be obtained more accurately, and achieve the effect of providing control quality, simple algorithm, and guaranteed solution accuracy
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[0061] A certain missile flies at an altitude of 5500 meters at 0.7464mach (velocity Vel=237.345m / s), its aerodynamic coefficient: aerodynamic and static stability Aerodynamic rudder effect Aerodynamic damping Lift coefficient due to one degree angle of attack One-degree pitch rudder deflection caused lift coefficient (Pneumatic reference area Sref=0.1m 2 , the reference length is Lref=3.50m); the quality characteristics of projectile structure: moment of inertia J z =500Kg / m 2 , mass m=700Kg.
[0062] (1), build a model
[0063] According to the flight state, structural parameters and aerodynamic parameters, the dynamic coefficient of the projectile can be calculated and solved
[0064] a 24 =-19.70, a 25 =-57.75, a 34 =0.8438,a 35 = 0.0905, a 22 =-1.10
[0065] The flight angle of attack and angular rate are the state variables of the longitudinal short-period of the monomer, ignoring the influence of flight speed and gravity on the longitudinal motion, and...
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