Research Of Stealth And Detection Technology Based Upon Electromagnetism Theory

Stealth technology is taken as the synthesis technology which can change the scattering character of weapon equipments and platforms, and make them difficultly found by enemy. It is one of the importance symbols of the weapon equipment modernization and military technology revolution, and will bring great change to the future world warfare and war mode. Flaws as erosion,crack,etc. influence stealth performance and airplane safety, so flaw detection is a very important issue in aviation. In this thesis, some of new stealth electromagnetic materials and structures are proposed based on the periodic geometry, and the controllable stealth technology is investigated to expand the stealth bandwidth. Flaw electromagnetic detection and its impact on stealth effect have been studied and analyzed from the point view of the electromagnetism. Using controllable metamaterial, a new idea of stealth is developed. Combing tiny metamaterial with electromagnetic "Hua bian" theory may be a breakthrough of the traditional stealth technology, so as to realize ideal stealth performance.The main contents are as follows:1. The status of stealth technology and weapon equipment has been discussed. Stealth and counter stealth technologies as well as their development trends are studied. The result indicates that controllable metamaterial, multi-frequency chart material and intelligent stealth material will become the uppermost candidates for the electromagnetic stealth technology.2. The electromagnetic characteristics of some periodic structures and metamaterial have been studied. Novel absorption materials and structures (ferrite base-chiral materials, metamaterial, Cassinian oval curves section structure) have been constructed and researched based on electromagnetic wave reflection, transmission, and positive or negative refraction theories. The studies demonstrate that, as a new method, the controllable metamaterial can obtain a good performance of electromagnetic wave stealth.3. The flaw detection and the influence of the flaw on stealth performance are studied and a novel electromagnetic detection on site for flows is investigated as well. This proposed method is used to probe aircraft engine blade cracks. Also feasibility for sudden change failure prediction has been analyzed.4. Radio frequency management technology on stealth is emphasized. Tactics, program and electron counter in the active stealth technology are expounded. The disadvantages of stealth technology and the feasibility of counter-stealth, and test stealth target by space-based radar are studied.