Online adaptive compensation method for active phased-array antenna of high-speed aircraft

Abstract

The invention discloses an online adaptive compensation method for an active phased-array antenna of a high-speed aircraft. The method comprises the following steps: determining structural parametersand material attributes of an active phased-array antenna of a missile-borne cover; arranging temperature sensors on an inner surface and an array surface of a radome; calculating the temperature field distribution along the thickness direction, the relative dielectric constant, the loss angle tangent, the thickness variation and the transmission coefficient of the radome; calculating an antenna array plane displacement field and a space phase error; extracting temperature field distribution of an antenna array plane feed system; calculating the temperature drift performance of a phase shifterand an attenuator, an excitation current error and the electrical performance of a missile-borne antenna under high-temperature ablation; comparing the initial electrical performance, and calculatingarray element radiation performance change; calculating the amplitude and phase adjustment amount of the array element excitation current, and obtaining the actual amplitude and phase compensation amount of the adaptive excitation current by considering the quantization errors of the phase shifter and the attenuator. According to the invention, the self-adaptive compensation of the electrical performance of the antenna is realized, and the reliability of the missile-borne antenna in the whole flight process is ensured.

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

Images