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Scanning-mode sea clutter local multi-fractal target detector

A technology of scanning mode and sea clutter, which is applied in the direction of radio wave measurement systems and instruments, can solve the problems of limiting the multi-fractal characteristics of sea clutter and target detection methods, and achieve the effect of good classification ability

Active Publication Date: 2010-11-10
NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
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Problems solved by technology

This limits the research on the multifractal characteristics of sea clutter and target detection methods in scanning mode

Method used

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  • Scanning-mode sea clutter local multi-fractal target detector
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  • Scanning-mode sea clutter local multi-fractal target detector

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings. With reference to the accompanying drawings in the description, the specific implementation of the present invention is divided into the following steps:

[0016] (1) After the signal returned from the radar antenna is amplified, mixed and detected, it is sent to the computing device 1 for preprocessing, and the amplitude is normalized.

[0017] (2) The computing device 2 receives the input radar system parameters, determines the azimuth sampling rate, the length M of the coherent pulse train that can be received at the same azimuth in each scanning cycle, and the total length N* of the time series to be used for one processing M, wherein N is the number of scanning cycles, and a corresponding storage space is opened in the storage device 3 for storing the echo data and calculation of one scan.

[0018] (3) The calculation device 4 receives the output data M o...

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Abstract

The invention discloses a radar scanning-mode sea clutter local multi-fractal target detector, belonging to the field of processing radar signals. The working of the radar in a residing mode is supposed in the existing sea clutter local multi-fractal target detection method, thus having larger dimensionality calculation and computation workload and being lack of instantaneity. The invention can be used for carrying out multi-fractal calculation on the basis that the radar works in a scanning mode, and a primary scanning process is not needed to acquire sufficient sampling points; the calculation of each scanning period dimensionality is updated by an iterative approach, thus ensuring the instantaneity; and the fuzzy characteristics of a local multi-fractal spectrum is extracted to form detection statistic. The detector has favorable capabilities of classifying the sea clutter and the target and detecting weak targets in strong sea clutter, is suitable for tracking target signals into fractal unstable clutter, and has generalization and application value.

Description

1. Technical field [0001] The invention relates to a scanning mode sea clutter local multi-fractal target detection method in the field of radar signal processing, and is suitable for signal processing systems of various sea imaging reconnaissance and early warning radars. 2. Background technology [0002] The sea clutter in radar scanning mode refers to the concatenation in time of the sea surface reflection echoes obtained at the same azimuth in each scanning cycle when the radar works in the scanning mode. The traditional way to deal with sea clutter is to study its statistical properties and establish stochastic statistical models. However, most of the traditional methods only use the first and second order statistical properties of sea clutter. Based on the non-stationary characteristics of sea clutter, fractal theory has been widely used in sea clutter research. Lo.T used the feature that the fractal dimension of ship target echo is lower than that of sea clutter for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 关键刘宁波宋杰
Owner NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
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