Secondly, a scheme using MMUSIC (Modified Multiple Signal Classification) algorithm for the wideband coherent source DOA(Direction of Arrival) estimation is introduced, in which the calculation method of applying average means is adopted to enhance the space spectral estimation precision.
A theoretical analysis of the in-line X-ray phase-contrast imaging with partially coherent source is presented in detail by using ambiguity function (AF). Experimental results in different conditions are presented. By comparing with absorption image, the phase contrast show high contrast and visibility of the inner structure of biological sample.
The algorithm reduces the sample errors by using the Toeplitz technique for the sample correlation matrix, so that it can rapidly converge and efficiently overcome the problem that the ESB Algorithm can not work in the environment of coherent signals.
This paper presents a new method of forming focusing matrices for the use of Coherent Signal Subspace Method (CSM). The proposed focusing transformation, which is constructed based on neural network, is a kind of perfect focusing transformation, i.e. focusing without preliminary DOA estimates and iterations.
Generalized Maximum Likelihood Algorithm for Direction-of-Arrival Estimation of Coherent Sources
It is flexible in the sense that the arriving sources may be a mixture of multiclusters of coherent sources, the array geometry is unrestricted, and the number of sources resolved can be larger than the number of sensors.
By using genetic algorithm, GML is realized, and the simulation results illustrate its improved performance compared with DML, especially in the case of multiclusters of coherent sources.
Spatial spectrum estimation of coherent sources impinging on nonuniform arrays
This technology promises to design rugged compact low cost tunable coherent sources the lasing range of which can easily be adjusted.
It is concluded that the performance of the GML algorithm coincides with that of the DML algorithm in the incoherent sources' case, while it improves greatly in the coherent source case.
It is suggested that such a waveguide be used to study collective phenomena in quantum-mechanical systems with a high density (Bose-Einstein condensate) and as a high-luminosity coherent source of cold atoms.
It is based on using a coherent source and measuring interference oscillations caused by an additional phase modulation at the input of the fiber.
Without the discovery of a strong coherent source, holography may not have happened at all.
Stimulated rotational Raman scattering of CO2 laser radiation in ortho-D2 provides a high-power coherent source in the infrared region from 11 to 14 μm.
The L-shaped uniform array of expend aperture is used to improve the precision of estimation, and the method of solving the ambiguity of angle under the condition of coherent signals is presented.
On two-direction spatial smoothing for estimation angle-of-direction of coherent signals
It is proved that the decorrelation, the effective aperture and the maximum number of distinguishable coherent signals (when array size is given) of the new method are better than those of the Evans' method.
In addition, the new preprocessing scheme itself can decorrelate the coherent signals received on the array.
Mode space smoothing algorithm to estimate DOA of coherent signals impinging on uniform circular array