| Military science and technology is the basis for construction of state armed forces and a crucial factor during warfare. This technology is not only an important indicator to measure the military strength of a country, but also an important means of national defense. Modern military technology involves updated and developed weaponry, with the rapid development in electronic information technology, biotechnology, nuclear ships, aviation, and navigation, among others. The radar has attracted attention in electronic communications, because it can accurately track and test the parameters of a target. On the one hand, the performance of the radar system has been continuously improved. On the other hand, various technical means to resist its accurate tracking should be explored to avoid radar detection. Chaff passive technology is investigated to achieve radar confrontation by analyzing scattering characteristics of chaff focus and foil. The effects of the combined materials on radar cross section(RCS) are determined. Foil and chaff array was formed by computer simulation, and the results were compared with the experimentally measured data with a single chaff and a single foil as bases.This study is broadly divided into three levels:First, a brief introduction to the physical characteristics of chaff is provided. Its scattering theory is elaborated when the chaff draw resonance can cause narrowing of its length. With the theoretical foundation, we use FEKO as modeling and simulation method to study the performance of chaff. Simple dynamic characteristics, namely, the drag coefficient of its impact when chaff moves in rarefied gas, of single chaff were analyzed. Then, cross section formula is derived from single chaff. For example, the half wavelength chaff of the maximum RCS is calculated. Finally, a chaff array at intervals is established to meet the conditions; we focus on the millimeter wave band chaff.Second, after we obtain a certain understanding of the chaff, the other side of the scattering body, namely, the foil is studied. Few documents introduced foil. Foil scattering is based on Huygens’ Principle contrary to the characteristics of chaff. We have made a more detailed description for foil nature. In addition, the formula for its maximum RCS is derived. Then, different shapes of foils array are created, to find the best mode for maximum RCS. Differences in the maximum RCS are observed.Finally, after the study of the chaff and foils, we tried to integrate the foil and chaff to make a new model to obtain a wider range, which shows greater value of the RCS. Therefore, starting from different angles, construction of the model through a certain way under diverse arrangements has a very different impact on its RCS. Thus, mixed study is necessary.The study also has some limitations, because the structural model was built by establishing a small model using certain software. Military war requires a lot of chaff to form a large cross section disguised as decoys. Thus, further in-depth study of chaff is necessary. The characteristics of chaff can be measured to obtain large amounts of data for analysis. The results are more accurate, but also better applied to actual combat. |
