A high-speed aircraft active phased array antenna online adaptive compensation method

Abstract

The invention discloses an online self-adaptive compensation method for an active phased array antenna of a high-speed aircraft, which includes determining the structural parameters and material properties of the active phased array antenna with a bomb-loaded cover; and arranging temperature sensors on the inner surface and front of the radome ; Calculate the temperature field distribution, relative permittivity, loss tangent, thickness variation and transmission coefficient of the radome along the thickness direction; calculate the displacement field and spatial phase error of the antenna array; extract the temperature field distribution of the antenna array feed system; Calculate the temperature drift performance of the phase shifter and attenuator, the excitation current error, and the electrical performance of the missile-borne antenna under high-temperature ablation; compare the initial electrical performance, and calculate the radiation performance change of the array element; calculate the excitation current amplitude and phase adjustment of the array element, and consider the shift The quantization error of phase controller and attenuator is used to obtain the actual amplitude and phase compensation amount of adaptive excitation current. The invention realizes the self-adaptive compensation of the electric performance of the antenna, and ensures the reliable performance of the missile-borne antenna in the whole flight process.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to an online adaptive compensation method for an active phased array antenna of a high-speed aircraft. Background technique [0002] During the supersonic and hypersonic flight of the missile-borne active phased array antenna, the air around the radome of the missile-borne antenna is severely compressed, which will cause the temperature of the radome to rise sharply. When the surface temperature rises to the melting point or sublimation point of the radome material, the surface of the radome begins to be ablated, causing the temperature of the radome on the surface of the radome and everywhere along the thickness direction to change. High temperature ablation will also cause the radome thickness changes. In addition, the severe temperature rise of the radome will also be transmitted to the array antenna inside the radome through heat conduction and heat radiation. On t...

AI Technical Summary

Problems solved by technology

However, during the flight of the missile-borne active phased array antenna, as the flight altitude, flight speed and angle of attack change, the temperature field of the missile-borne antenna will change in real time, and different temperature field distributions will affect the material properties of the missile-borne antenna. and thickness, as well as the influence of array antenna element position and feed error in the cover are different, resulting in different changes in electrical performance, therefore, it is necessary to monitor the temperature state of the bomb-borne active phased array antenna in real time

In addition, in response to the deterioration of the electrical performance of the missile-borne active phased array antenna caused by high-temperature ablation, EppersonJr E H. Adaptively ablatable radome: U.S., Patent 5,457,471[P]. 1995-10-10 coated the outer surface of the radome with ablation Materials, using thermal ablation of materials to reduce the temperature of the radome. However, during supersonic and hypersonic flight, the extremely high flight speed will cause the temperature of the radome to change, and the change in the thickness of the ablated material itself will also affect the electrical performance; In addition, there are also ways to reduce the impact of high-temperature ablation by optimizing the structure design and material technology of the radome, but the increase in cost cannot avoid the change of material properties and thickness caused by the temperature rise of the radome; The phased array antenna calibration technology is also difficult to use for performance compensation of the missile-borne antenna in flight. Adaptive method for electrical performance compensation

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