Design method for sea clutter inhibition curve of marine radar based on wavelet transformation

A marine radar and wavelet transform technology, applied in the field of marine navigation radar signal processing, can solve the problems of inability to distinguish between targets and clutter, high signal strength, and insignificant effects, achieving good adaptability, good filtering effect, and good adaptive effect

Active Publication Date: 2016-06-29
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In recent years, most of the radar products purchased by most coastal fishermen are foreign radars, such as Furuno of Japan and Atlas of Germany. Most of the small and medium-sized radar receivers of these companies use logarithmic intermediate frequency amplifiers, which are sent to the baseband after linear envelope detection. Although the logarithmic intermediate frequency amplifier can suppress the strong radar echo signal at close range ...

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  • Design method for sea clutter inhibition curve of marine radar based on wavelet transformation
  • Design method for sea clutter inhibition curve of marine radar based on wavelet transformation
  • Design method for sea clutter inhibition curve of marine radar based on wavelet transformation

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[0041] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] figure 1 It is a flowchart of the method of the present invention, as shown in the figure, the method comprises the following steps:

[0043] S1: Record the current radar echo data, which is usually the data in a distance unit. According to the range setting, only the data in the range is kept, and the data outside the range is removed to reduce the amount of calculation;

[0044] S2: Carry out wavelet decomposition on the collected radar echo data. The wavelet decomposition is divided into two parts, one part is the approximation part CA(i), and the other part is the detail part CD(i), where i is the number of decomposition layers;

[0045] S3: Set the coefficients of the decomposed detail part to zero, keep only the high-level approximation part, and then reconstruct the original radar echo data with the high-level approximation c...

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Abstract

The invention relates to a design method for a sea clutter inhibition curve of a marine radar based on wavelet transformation, and belongs to the technical field of signal processing of the marine navigation radar. Echo data of the radar in the measuring range is decomposed via discrete wavelet transformation, a high-frequency coefficient is zeroed, and a high-level approximate part is used to estimate power level of sea clutters. A corresponding adjustable sea clutter inhibition curve is calculated according to a range parameter and a sea clutter inhibition intensity parameter, and the estimated power level of the practical sea clutters is overlapped with the adjustable sea clutter inhibition curve to obtain a general sea clutter inhibition curve. The inhibition curve design method is highly adaptive to a traditional sea clutter inhibition method relied on statistical characteristics, it is not required to predict distribution which the power level of background clutters obeys in advance, the method has a good inhibition effect for near sea clutters, and the problem that sea clutters surrounding the circular center of a radar screen are hard to eliminate is overcome; and the design method is flexible to use, and includes different inhibition levels, so that a user can carry out sea clutter inhibition of different levels according to practical sea-condition information.

Description

technical field [0001] The invention belongs to the technical field of marine navigation radar signal processing, and relates to a wavelet transform-based sea clutter suppression curve design method for marine radar. Background technique [0002] In recent years, the shipbuilding industry has developed vigorously, and the supporting shipboard electronics industry has also developed rapidly. Ship navigation radar is one of the necessary equipment for civil ships to go to sea, and its function is directly related to the market competitiveness. The main criterion for measuring a radar is to measure the accuracy and effectiveness of the radar's clutter suppression. Nautical radar mainly operates on the sea surface, and the clutter mainly comes from ocean waves. Therefore, how to effectively filter out the ocean clutter has been a subject of constant research. [0003] The traditional sea clutter suppression method is to use the STC curve. On the one hand, the STC curve can inc...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 田增山杨进超李爽赵朋朋王名孝刘恒
Owner CHONGQING UNIV OF POSTS & TELECOMM
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