Atmosphere data measurement method of hypersonic flight vehicle

An atmospheric data and hypersonic technology, which is applied in measurement devices, instruments, mapping and navigation, etc., can solve problems such as inability to provide air data information for aircraft, increase in errors, and failure to consider wind speed in the calculation process.

Pending Publication Date: 2019-11-15
CHINA AERODYNAMICS RES & DEV CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the error of the inertial device itself and its recursive navigation algorithm, the errors of the flight parameters such as the angle of attack, sideslip angle, and Mach number will gradually increase with time, and the differences between the angle of attack and the angle of sideslip The influence of wi

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  • Atmosphere data measurement method of hypersonic flight vehicle
  • Atmosphere data measurement method of hypersonic flight vehicle
  • Atmosphere data measurement method of hypersonic flight vehicle

Examples

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Embodiment 1

[0093] A method for measuring atmospheric data of a hypersonic vehicle, comprising the steps of:

[0094] The first step is the design of system state quantity and observation quantity;

[0095] The second step: system dynamics model and observation model establishment;

[0096] The third step is the optimal estimation of the system state quantity;

[0097] The fourth step is atmospheric data estimation.

Embodiment 2

[0099] A method for measuring atmospheric data of a hypersonic vehicle, comprising the steps of:

[0100] The first step is to define the reference coordinate system; select the aircraft speed, position, attitude, wind speed and inertial component zero bias as the system state variables, and use the aircraft front surface pressure distribution and aircraft position and speed measurements as system observations.

[0101] The second step is to construct a system dynamics model based on the hypersonic vehicle dynamics and kinematics equations; use the mapping relationship between system measurements and atmospheric data to establish a system observation model.

[0102] The third step is to estimate the system state quantity through nonlinear Kalman filtering.

[0103] The fourth step is to use the estimated value of the state quantity to calculate the estimated value of the atmospheric data.

Embodiment 3

[0105] A method for measuring atmospheric data of a hypersonic vehicle, comprising the steps of:

[0106] The first step, system state quantity and observation quantity design:

[0107] Taking the earth-centered earth-fixed system ECEF as the reference coordinate system, the origin O is located at the center of the earth, ox points to the intersection of the prime meridian and the earth’s equator, oz points to the North Pole, and ox, oy, and oz together form a right-handed coordinate system.

[0108] Define the b system as the body coordinate system, where the origin is at the center of mass of the aircraft, and the x, y, and z axes point to the front, top, and right of the aircraft respectively;

[0109] Define va as the velocity coordinate system, where the origin is located at the center of mass of the aircraft, the x and y axes point to the velocity direction and the vertical axis of the aircraft respectively, and ox, oy, and oz together form a right-handed coordinate syst...

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Abstract

The invention relates to an atmosphere data measurement method of a hypersonic flight vehicle. The method comprises that a reference coordinate system is defined, the speed, position, attitude, wind speed and inertia device zero offset of the flight vehicle are selected as system state quantities, and front-end surface pressure distribution and position and speed measuring values of the flight vehicle serve as system observed quantities; a system dynamic model is established based on dynamic and kinetic equations of the hypersonic flight vehicle, and a system observation model is established by using mapping relation between system measurement data and atmosphere data; nonlinear Kalman filtering is used to estimate the system state quantity; and an estimated value of the state quantity isused to obtain an atmosphere data estimated value. Compared with a traditional method, the method of the invention can be used to estimate atmosphere data precisely in the hypersonic speed flight environment, a result can be applied to hypersonic flight vehicle control and flight test evaluation and identification, and the flight robustness and evaluation accuracy are improved.

Description

technical field [0001] The invention belongs to the technical field of hypersonic aircraft, in particular to a method for measuring atmospheric data of a hypersonic aircraft. Through this method, a high-precision measurement method of atmospheric data in a hypersonic flight environment can be realized. Background technique [0002] Hypersonic aircraft has the unique advantage of flying in adjacent space at a speed greater than 5 Ma. It is the core key technology for long-term, long-distance, high-speed flight and free access to space in the near space in the future. It has a strong military-civilian background. High-precision atmospheric data and flight parameter measurement technology is one of the most important technologies for air-breathing hypersonic vehicles, which is embodied in the following aspects: [0003] (1) Requirements for flight test testing and evaluation and test database construction. Flight test is the best means of research, verification, assessment an...

Claims

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Application Information

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IPC IPC(8): G01C23/00
CPCG01C23/00
Inventor 丁智坚周欢王琪刘建霞张小庆王锋贺元元吴颖川
Owner CHINA AERODYNAMICS RES & DEV CENT
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