Airplane angular rate signal reconstruction method based on unscented kalman filter

An unscented Kalman, signal reconstruction technology, applied in the aviation field, can solve the problems of non-linear aircraft that cannot be directly applied, unsuitable for engineering applications, and complicated operation.

Inactive Publication Date: 2013-10-23
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] In the prior art, the dimensionality reduction observer is used to reconstruct the pitch rate signal, but the research object is a linear aircraft model, so it cannot be directly applied to nonlinear aircraft
Some use the extended backpropagation neural network method to reconstru

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  • Airplane angular rate signal reconstruction method based on unscented kalman filter
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  • Airplane angular rate signal reconstruction method based on unscented kalman filter

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Embodiment Construction

[0097] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples.

[0098] refer to figure 1 , an aircraft angular rate signal reconstruction method based on unscented Kalman filtering, comprising the following steps:

[0099] 1) Establishment of state equation

[0100] Considering the generality of the problem, assume the following conditions:

[0101] (1) The plane is a rigid body, and its mass is considered constant;

[0102] (2) Treat the earth as an inertial system, ignoring the influence of the earth's rotation and revolution;

[0103] (3) Ignore the curvature of the earth, that is, adopt the so-called "flat earth assumption";

[0104] (4) Assuming that the plane is symmetrically arranged, that is, the product of inertia I xz and I zy is equal to zero.

[0105] The spatial motion of a rigid-body aircraft can be described by the six-degree-of-freedom relationship of th...

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Abstract

The invention discloses an airplane angular rate signal reconstruction method based on unscented kalman filter. The method comprises the following steps of: (1), denoising an attitude angle measurement signal containing measurement noise through a nonlinear tracking differentiator to obtain a differential signal of an attitude angle, and constructing a virtual measurement equation; (2), constructing a state equation of a system on the basis of natural characteristics of an airplane and according to tri-axial angular rate signals and torque characteristics of the airplane; and (3), reconstructing an angular rate signal of the system by selecting the unscented kalman filter technology as the processing manner because both the state equation and the measurement equation are nonlinear and the estimation precision can be influenced by traditional operation for linearizing a nonlinear equation.

Description

technical field [0001] The invention belongs to the field of aviation technology, and relates to an aircraft angular rate signal reconstruction method based on an unscented Kalman filter. Background technique [0002] Since the successful breakthrough of the sound barrier, the flight envelope of the aircraft has gradually expanded, and the stability of the aircraft itself has gradually deteriorated; and as the flight altitude increases, the damping torque of the aircraft itself has gradually decreased, making it difficult to maneuver the aircraft. The angular rate feedback of the aircraft is the key feedback signal to increase the system damping, which directly affects the stability of the aircraft. Therefore, the research on fault diagnosis and signal reconstruction of angular rate sensor becomes more and more important. The sensors of modern aircraft generally use redundancy technology to improve reliability. The so-called redundancy technology is to introduce multiple sy...

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Application Information

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IPC IPC(8): G01C21/20
Inventor 刘小雄李鹏辉史静平章卫国李广文
Owner NORTHWESTERN POLYTECHNICAL UNIV
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