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Mode space algorithm is capable of estimating the DOA for coherent sources provided that the receiving array is uniform circular array (UCA). In this paper, we propose an improved mode-MUSIC (IMODE-MUSIC) algorithm based on a hybrid array which is composed of a uniform circular array and a directional antenna located at the circular array center. By utilizing the mode space algorithm, the UCA is transformed...
Conventional subspace-based methods for solving the narrow-band multiple sources location problems show high resolution, provided that the power of each source is identical. However this assumption may be not suitable for targets in electronic warfare. To deal with sources with unequal power, in this paper, we propose a method that reconstructs the eigenvalues of the noise subspace in covariance matrix...
The Schumann resonances (SRs) are of great significance for probing the global circuit. The diurnal and seasonal variations in mode amplitudes and frequencies of the first four modes of SR magnetic components based on 2 years measurements at the stations located in China are firstly presented here. The frequencies of all the four modes have their maxima during boreal winter and minima during summer,...
Schumann Resonance is a natural phenomenon, and many researches reveal that its parameters have some relation with the global storm activities, ionospheric parameters and the earth activities and so on. This paper mainly focus on the analysis of the SR magnetic signals observed at the mountain area of Weihai, lied at northeast cost of China. Statistics are made on the regular distribution of the first...
The aim of this paper is to show the propagation and polarization characteristic of some types of ELF electromagnetic emission below the cutoff frequency observed by DEMETER satellite. All the analysis is based on multi-component measurement method of electric and magnetic field in ELF band. According to the wave vector and planarity and ellipticity of polarization, we can judge the property of electromagnetic...
Electromagnetic monitoring methods are in good graces of the experts on short-term and immediate earthquake prediction. Radio sounding technology is one of the methods which has been studied for more than 10 years in Russia and Japan. The research has showed the functions in revealing the seism-ionospheric coupling mechanism and earthquake prediction. Various ways of radio sounding technology to monitor...
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