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An Array-Based Passive Detection Method for Weak Line Spectrum Targets

A detection method and weak line spectrum technology, applied in the field of passive detection of weak line spectrum targets, can solve the problems of long operation time, weak target detection failure, inability to perform multi-target resolution of the same frequency line spectrum, etc., and achieve good resistance to strong broadband coherence. Effects of interference, good weak line spectrum target detection ability

Active Publication Date: 2017-06-20
HARBIN ENG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

This method also needs to be counted in time, the calculation time is long and the real-time performance is poor, and it is impossible to distinguish multiple targets with the same frequency line spectrum. Target detection fails as Figure 12

Method used

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  • An Array-Based Passive Detection Method for Weak Line Spectrum Targets
  • An Array-Based Passive Detection Method for Weak Line Spectrum Targets
  • An Array-Based Passive Detection Method for Weak Line Spectrum Targets

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specific Embodiment approach 1

[0044] Specific implementation mode one: combine figure 1 and image 3 An array-based passive detection method for weak line spectrum targets in this embodiment is described, which is specifically prepared according to the following steps:

[0045] Step 1. Signal x received by M array elements 1 (t),x 2 (t),...,x M (t) Perform fast Fourier transform (FFT: Fast Fourier transform) respectively to obtain the spectrum X of the signal received by each array element 1 (f),X 2 (f)…X M (f); then each array element at the frequency point f i The spectral value of can be expressed as X 1 (f i ),X 2 (f i )…X M (f i );

[0046] Among them, M is the number of array elements, f is the frequency, f i Indicates the i-th frequency point within the signal processing frequency band, the value range of i is 1~L, f 1 is the lower limit of signal processing frequency point, f L is the upper limit of the signal processing frequency, the superscript T means transpose; L=B / Δf, B is th...

specific Embodiment approach 2

[0068] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 2, the frequency-domain beamforming processing calculation formula adopts CBF (conventional beamforming) or MVDR (minimum variance distortion-free response beamforming) processing, and the beamforming is required to be robust CBF is used when the performance is the best, and MVDR beamforming is used when good azimuth resolution is required. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0069] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the frequency orientation output matrix P after the transposition in step three T Specifically:

[0070]

[0071] where the frequency f is given by [f 1 ,f 2 ,... f L ] consists of a total of L frequency points. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a weak lien spectrum object passive detection method based on an array. The method comprises a step 1 of obtaining frequency spectrums of signals received by each array element; a step 2 of obtaining a frequency orientation output matrix form; a step 3 of obtaining a matrix PT; a step 4 of forming a spatial spectrum output value; a step 5 of determining the orientation of a detection object; a step 6 of obtaining a line spectrum object; and a step 7 of determining whether a frequency spectrum curve has a line spectrum or not. The method is applied to the field of weak line spectrum object passive detection, and solves problems that a conventional beam forming (CBF) technology does not have detection advantages for a line spectrum object, a CBF line spectrum detector requires four-dimension display, is not visual and not favorable for observation, and many methods which do not require four-dimension display require statistics in the array signal processing field.

Description

technical field [0001] The invention relates to a passive detection method for a weak line spectrum target, in particular to an array-based passive detection method for a weak line spectrum target. Background technique [0002] The line spectrum feature is an inherent feature of underwater vehicles, and the intensity of the target line spectrum is often higher than the intensity of the continuum spectrum. Line spectrum detection is not only conducive to the discovery of long-distance low signal-to-noise ratio targets but also to the identification of targets identify. The line spectrum detection method of the array can obtain the spatial processing gain, which is beneficial to the detection of weak targets. Usually, the broadband array signal processing technology is to add the beamforming spatial spectrum output results of each frequency point to obtain the total broadband beamforming spatial spectrum. output curves, this method is referred to simply as the general additiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/539
CPCG01S7/539
Inventor 梅继丹孙大军滕婷婷朱英慧薛芙莲
Owner HARBIN ENG UNIV
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