An improved sea clutter suppression algorithm based on EMD decomposition

A technology of sea clutter and algorithm, which is applied in the field of sea clutter suppression algorithm based on EMD decomposition, can solve problems such as endpoint effect, lack of screening criteria, and poor real-time performance, so as to suppress clutter and interference, improve algorithm efficiency, and improve The effect of speed and efficiency

Inactive Publication Date: 2019-06-25
艾索信息股份有限公司
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Problems solved by technology

But inevitably, the algorithm also has some problems, such as poor real-time performance, lack of effective screening criteria, endpoint effects and modal mixing, etc.

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  • An improved sea clutter suppression algorithm based on EMD decomposition
  • An improved sea clutter suppression algorithm based on EMD decomposition
  • An improved sea clutter suppression algorithm based on EMD decomposition

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Embodiment Construction

[0047] The present invention will be further described in detail below through specific embodiments, drawings and data tables.

[0048]According to the present invention, due to the influence of clutter and noise in the data, the number of IMF layers of the original data increases, which causes the overall calculation amount to increase sharply, resulting in poor real-time performance. In this method, the frequency spectrum of the clutter area data to be processed is obtained first, and the noise estimation of each distance unit is obtained according to the CFAR detection theory. In order to ensure that the useful information can exceed the threshold, a lower threshold should be used limit. Since the threshold value is the noise value estimated by CFAR detection, the noise estimate is subtracted from the spectrum, and then the result is subjected to FFT inverse transformation to obtain the original data with most of the noise interference removed.

[0049] In the decompositio...

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Abstract

The invention provides an improved sea clutter suppression algorithm based on EMD decomposition, and belongs to the technical field of frequency domain signal processing. The sea clutter suppression algorithm comprises the following steps: firstly, solving a frequency spectrum of clutter area data to be processed, and detecting an estimated clutter value to be set as a threshold value to obtain original data with clutter interference filtered out; Iteratively decomposing the original data to obtain an appropriate IMF (Inertial Measurement Function), and screening and judging by adopting a Rilling algorithm; Adopting a polynomial fitting continuation method to solve the endpoint effect; Mode aliasing in EMD decomposition is suppressed using a mask signal. Strong clutters and interference contained in the data are removed, and the operation efficiency of the EMD algorithm is improved; The influence of modal aliasing is effectively inhibited; The suppression of sea clutters and part of interferences is realized, and the suppression capability of the constant false alarm algorithm on the sea clutters is improved. By effectively combining multiple EMD improvement measures, the effectiveness and applicability of the algorithm are improved.

Description

【Technical field】 [0001] The invention relates to the technical field of frequency domain signal processing, in particular to an improved sea clutter suppression algorithm based on EMD decomposition. 【Background technique】 [0002] At present, conventional sea clutter suppression methods in the world mainly include cancellation methods and subspace methods. Sea clutter cancellation methods include circular cancellation algorithm and its improved algorithm. These methods estimate the parameters of the clutter components in the frequency domain, process the signal in the time domain, and use multiple iterations to eliminate the sea clutter one by one to reveal the target. Subspace methods include singular value decomposition method and its improved algorithm, characteristic subspace method and its improved algorithm, etc. [0003] In recent years, foreign countries have successively proposed sea clutter suppression and detection algorithms based on image processing theory, c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
Inventor 李锋林苏鹏达赵海军夏金艳蒙炜刘金柱
Owner 艾索信息股份有限公司
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