Method for detecting number of signals under condition of mixing of uncorrelated and correlated signals in uniform linear array

A coherent signal and uniform line array technology, applied in the field of signal processing, can solve problems such as detection effect degradation and detection result error

Active Publication Date: 2012-10-03
RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for detecting the number of signals in the case of mixed uncorrelated and coherent signals in a uniform linear array, which solves the problems in the prior art that the detection effect will degrade when the incident signal is coherent, and there are large errors in the detection results.

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  • Method for detecting number of signals under condition of mixing of uncorrelated and correlated signals in uniform linear array
  • Method for detecting number of signals under condition of mixing of uncorrelated and correlated signals in uniform linear array
  • Method for detecting number of signals under condition of mixing of uncorrelated and correlated signals in uniform linear array

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Embodiment

[0075] The following describes the estimation of the number of signals in multipath propagation through an embodiment:

[0076] Considering that the uniform linear array is composed of M isotropic sensor elements with an interval of d, it is now assumed that K frequency is f 0 the signal{s i (n)} in different directions {θ i} incident on the uniform linear array. These incident signals are determined by K u an unrelated signal and K c coherent signal composition. in, i=K u +2,...,K,α p is the complex attenuation coefficient, K=K c +K u . The array model can be expressed as,

[0077] y n = Σ i = 1 K u a ( θ i ) s i ( n ) +...

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Abstract

The invention discloses a method for detecting the number of signals under the condition of mixing of uncorrelated and correlated signals in a uniform linear array. The method for detecting the number of the signals is characterized by including steps of constructing a difference matrix, dividing the difference matrix into superimposition submatrixes, constructing a connecting matrix, and acquiring the number of the correlated signals in incident signals by solving a rank of the connecting matrix; and acquiring a rank of an array covariance of the incident signals by a ratio criterion based on singular value decomposition, and acquiring the estimated number of the uncorrelated signals. Large quantities of simulation experiments prove that the method for detecting the number of the signals is superior to an MDL (minimum description length) method/ an AIC (akaike information criterion) method, an MENSE method and an SRP (smoothing rank profile) method which are pre-processed by an FBSS (forward-backward spatial smoothing) under the conditions of fewer snapshots and low signal noise ratio.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a method for detecting the number of signals under the condition that uncorrelated and coherent signals are mixed in a uniform linear array. Background technique [0002] Array signal processing is an important branch of signal processing, which is closely related to parameter estimation, system identification, adaptive filtering, statistical signal processing, and matrix theory, and is used in radar, sonar, communication, seismic data processing, and medical imaging. It is widely used in many fields. Its two main research directions are signal number estimation and signal direction estimation. The signal number estimation is the basis of direction estimation. When the signal number estimation is inaccurate, the signal direction estimation will be seriously affected. Therefore, a research An efficient and accurate signal number estimation algorithm has grea...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/00
Inventor 陶浩辛景民刘畅农郑南宁
Owner RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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