Two-dimensional spatial-spectrum spectral-peak searching method

A spectrum peak search, two-dimensional space technology, applied in radio wave direction/deviation determination system, radio wave direction finder, radio wave director parts and other directions, can solve the missing alarm rate and false alarm rate increase , Array channel inconsistency signal low signal to noise and other issues, to improve the effect of estimation accuracy

Inactive Publication Date: 2012-06-27
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, in practical engineering applications, due to problems such as array channel inconsistency, mutual coupling of antenna elements, and low signal-to-noise ratio, the actual spatial spectrogram is often not ...

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  • Two-dimensional spatial-spectrum spectral-peak searching method
  • Two-dimensional spatial-spectrum spectral-peak searching method
  • Two-dimensional spatial-spectrum spectral-peak searching method

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Embodiment Construction

[0020] The specific implementation and process of the two-dimensional spatial spectrum peak search method referred to in the present invention will be further described below in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown, the receiving antenna array consists of multiple omnidirectional antennas (such as figure 1 8) are used as array elements to form a uniform circular array, the distance between adjacent array elements is equal to half the wavelength of the carrier frequency of the received signal, and the received signal is a far-field incoherent narrowband signal. The azimuth angle θ and elevation angle of the incident signal The relative position relationship with the antenna array is as follows figure 1 As shown, where xyz is the three-dimensional coordinate system, the azimuth θ is the angle between the projection of the incident signal on the xoy plane and the positive direction of the x-axis, and the elevation angle is the angle ...

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Abstract

The invention discloses a rapid two-dimensional spectral-peak searching method suitable for engineering realization. The method comprises the following steps of: 1, carrying out two-dimensional global search for a spatial spectrogram composed of a noise subspace and antenna array flow pattern vectors, and obtaining global search spectral-peak points; 2, carrying out fine search near the global search spectral-peak points, and obtaining spectral-peak candidate points; 3, classifying the spectral-peak candidate points, and finding real spectral-peak points corresponding to the number of signals; and 4, and utilizing false spectral peak information around a real spectral peak, and finally using a weighted value of the real spectral peak and false spectral peaks around the real spectral peak as an estimated value of an incoming wave direction. Aiming at using a 2D-MUSIC algorithm to estimate the direction of arrival of incident signals, a two-dimensional spectral-peak searching process occupies most of the time of the whole algorithm so as not to obtain the direction of arrival of the signals in real time or on time. According to the method disclosed by the invention, on the basis of characteristic analysis of the spatial spectrogram, a data cluster and grading searching method is used to accelerate the spectral-peak searching process and the precision of search results are ensured.

Description

technical field [0001] The invention relates to the two-dimensional estimation of the direction of arrival of the signal in the array signal processing, in particular to the search method of the spectral peak in the signal two-dimensional space spectrum. Background technique [0002] In modern array signal processing, direction of arrival (DOA) estimation has been a research hotspot in recent decades, and has a wide range of applications in radar, underwater sonar, mobile communication and electronic countermeasures. In practical applications, it is usually necessary to perform two-dimensional direction finding (azimuth and elevation angles) on the direction of arrival of multiple signal sources. Scholars at home and abroad have proposed a variety of solutions. Among them, the subspace method such as the MUSIC algorithm is a relatively classic method. Its direction finding error can approach the lower bound of the Cramer-Rao variance and has a high angular resolution. Howev...

Claims

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Application Information

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IPC IPC(8): G01S3/12G01S3/14
Inventor 马洪陈劲峰谭萍罗冶
Owner HUAZHONG UNIV OF SCI & TECH
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