高频电磁辐射、散射问题中激励与响应之间的点性关系成立。这一关系可用一并是变换函数给出。因此高频电磁场问题关键在于寻求并矢变换函数。并矢格林函数理论能够给出典型电磁场问题激励与响应之间的线性关系。借助高频电磁场的局域性原理、传播与绕射遵循的费马原理，极易求得高频电话场问题的矢变换函数。本文讨论了高频电磁场问题中的矢格林函数方法，研究了矢格林函数方法在寻求并矢变函数中的应用。得到了部分工程问题的理论结果。

Owing to the decametric wavelength, large aperture antenna array is needed for high frequency (HF) ground radar to obtain high angular resolution with conventional beam forming (CBF); for the case of compact antenns or smarB aperture array, spatial super-resalution algorithms are used to get safislactory angular resolution. Wuhan University's occan state measurlng and anolyzing radar (OSMAR2000) is expected to real time extract ocean surface current, wave and surface wind at medium-and long-range. To obtain long-range (ie. 2O0km) current mapping, radar frequency must be salaried in the lower region of the HF hand, e.g, 7.5MHz, Digital beam forming (DBF) is applied with the 120m-long phased array to determine the bearings of sea echo with 15 resolution for wave and wind extraction. The angular resolution is, however, too coarse for current mapping, especlally when the ocean current detection range Is as far as 200km. Consequently, a super-resolution ocean surface current algorithm based on multiple signal classification (MUSIC) is developed for OSMAR2000. The relative theorY basis, processing procedure and preprossing and postproessing associated with the algurithm are given in this, paper, The comparison of OSMAR2000 measurements with the measurements from current meter and Ihe Seasonde system shows the ocean surface currenl algorithm based on MUSIC for OSMAP2000 can meet the requiumenta of the project contract successfully.

ocean surface current algorlthm based on MUltiple SIgnal Classlfication (MUSIC) is used for current mapping of Wuhan Universlty's occan state measuring and analyzing radar (OSMAR2000), in which MUSIC is applled to estimate the bearings of the first-order sea echn slgnals. The premlse of MUSIC processing is that the number of signals is known in advance. In fact, the numbere of signals is unknown, and needs to be estimated from received data. In the case of diserete larges the problem can be perfectly solved ming information theoretic criteria such as the Akalke Information Criterion (AIC) Or the Minlmum Description Length (MDL) criterion. However, these criteria are proved unsuccessful for sea echo signals both in slmulation and in actual application, since sea surface is essentially a continum. Therefore, an ad hoc method of dotection of dete number of signals, a bit different from the existent mebods, Is developed for the current algorithm of OSMAR2000. The underlying idea is to determine the number of signals based on the varlance of MUSlC spectra stracture under difierent candidate number of signals.

本文研究了介质涂敷导电凸曲面上磁振子辐射与绕射一致性高频渐近理论，文中在典型曲面一致性高频近似解基础上发展了介质涂敷导电凸曲面上磁振子国徽与绕射的一致性几何绕射理论。导出了涂敷导电凸曲面上磁流源高频电磁国徽场的一致性几何绕射理论公式。在这个公式中，国徽与红射场用四个广州Fook型表示，深光区这些函数退化为几何光学场，暗区场则表示不同模式爬行波的叠加。

研究了涂敷导电圆柱曲面电型共形天线高频电磁特性及共计算方法。文中利用电大尺寸条件下的高频近似技术，导出了电振子激励源远区辐射的一致性几何绕射理（Uniform Geom etrical Theory of Diffraction）（UTD）公式。结果表明，涂敷导电曲面电型，磁型激励的辐射与绕射函数均为同一Fock型函数。