RCS measuring method and measuring system based on beam deflection

Abstract

The invention provides an RCS measuring method and system based on beam deflection. In a two-support one-suspension support system, a pitch angle alpha of an airplane is changed by adjusting the length of a lifting rope; a rotary bench rotates to drive the airplane to realize changing of a target azimuth phi; and thus target RCS measurement is carried out. Besides, when RCS measurement of the target is carried out in the two-support one-suspension support system, a beam deflection angle gamma between an electromagnetic wave ray and a rotary bench rotating shaft z is generated based on a defocusing design of a feed source phase center of a compact field; and large-circular scanning or conical scanning is realized by adjusting the beam deflection angle gamma between the electromagnetic waveray and the rotary bench rotating shaft z, the airplane pitch angle alpha, and a rotary bench azimuth phi 1. According to the invention, with the RCS measuring method and system, the measurement rangeof the zenith angle theta is increased; the data integrity is improved, the measurable area is increased, and the amount of effective test data is improved; and while no workload is increased, the safety of target motion is improved by using two kinds of different scanning method jointly.

Description

technical field [0001] The invention belongs to the field of low-observable technology, and in particular relates to an application method and technology of a target support system in RCS measurement of a real combat stealth aircraft. Background technique [0002] The Radar Cross Section (RCS) of a complex target is a function of frequency F, polarization state (HH, VV, VH, HV), and characteristic attitude angles θ, φ. [0003] The characteristic attitude angle represents the angle between the plane electromagnetic wave direction and the target, see image 3 . In order to accurately describe the attitude angle θ, φ, the target coordinate system is established on the measured aircraft, the aircraft is aligned with the x' axis and coincides with the fuselage axis, the horizontal plane of the aircraft coincides with the x'y' plane, and the z' axis coincides with the back of the aircraft vertical. [0004] image 3 Among them, θ is the angle between the z' axis and the electro...

AI Technical Summary

Problems solved by technology

[0024] ①The RCS of the pole and the suspension rope itself is high, and the RCS of the support system must be reduced through complex technology

[0025] ②Measurement parameters aircraft pitch angle α and turntable azimuth angle φ 1 It is not the required characteristic attitude angle θ, φ, so the required σ(θ, φ) cannot be directly obtained

[0026] ③The quality of the target to be measured is very high, and it is dangerous to adjust the pitch angle α of the aircraft with a sling

Therefore, the range of controllable aircraft pitch angle α is small

Images