Sky wave radar sea clutter suppression method based on chaos sequence prediction

A chaotic sequence and sea clutter technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as unsatisfactory detection of slow ship targets, poor engineering practicability, and difficulty in selecting the number of loop iterations.

Inactive Publication Date: 2014-08-27
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0010] Technical problems: In view of the unsatisfactory detection of slow ship targets in the current sky-wave radar sea clutter suppression method, the dependence on the correl

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  • Sky wave radar sea clutter suppression method based on chaos sequence prediction
  • Sky wave radar sea clutter suppression method based on chaos sequence prediction
  • Sky wave radar sea clutter suppression method based on chaos sequence prediction

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Embodiment

[0050] The method for suppressing sea clutter of sky-wave radar based on chaotic sequence prediction proposed by the present invention includes two processes: a training process and a working process. Reference attached Figure 1-3 , The method is carried out as follows.

[0051] Step 1: Initialize each parameter in the predictor.

[0052] The structure model of the predictor is as figure 1 Shown. In the predictor, the number of prediction units in the reserve pool is N, the weight matrix W of the reserve pool prediction unit is a randomly generated sparse connection matrix with a sparsity α, and the weight matrix of the input unit W in And the weight matrix W of the feedback unit back Is a randomly generated fully connected matrix. In the present invention, the sea clutter signal needs to be predicted. The prediction method is to use the first K values ​​of the sea clutter sequence to predict the K+1 value, where K is the embedding dimension of the selected input layer (the in...

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Abstract

The invention belongs to the technical field of sky wave radar, and relates to a sky wave radar sea clutter suppression method based on chaos sequence prediction. The sky wave radar sea clutter suppression method based on chaos sequence prediction aims to solve the problems that in an existing sky wave radar sea clutter suppression method, due to the fact that target detection of a low-speed naval ship is not satisfactory and depends on relevance of a plurality of clutter reference distance units, engineering practicability is not high, the number of loop iteration times is difficult to select and precision is low. According to the sky wave radar sea clutter suppression method based on chaos sequence prediction, a sea clutter internal chaos dynamical model is obtained by means of a chaos predictor, sea clutters are counteracted in a non-linear prediction method, and a target signal is maintained. The method includes a training process and a work process. In the training process, internal rules of a section of sea clutter signals without a target or with a weak target signal are learnt by means of the predictor; in the work process, prediction and counteraction of the sea clutters are achieved by means of signals of a target unit to be detected via the well trained predictor, and accordingly target information is displayed. The method is suitable for sky wave radar.

Description

Technical field [0001] The invention belongs to the technical field of sky wave radars, and is mainly applied to the suppression of sea clutter in sky wave over-the-horizon radars. Background technique [0002] Skywave Over-The-Horizon Radar (OTHR, Over-The-Horizon Radar) uses the reflection of high-frequency waves from the ionosphere to detect targets from top to bottom, so the echo signal often contains strong sea clutter interference components. Seriously affect target detection, especially low-speed ship targets. Due to the low speed of the ship target itself, the Doppler frequency generated is close to the sea clutter, which is easily covered by the sea clutter in the frequency spectrum. In addition, factors such as sea surface ocean currents and ionospheric disturbance will also cause the sea clutter spectrum to broaden. It further increases the difficulty of target detection. Therefore, it is necessary to study the method of skywave radar sea clutter suppression. [0003] ...

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/414
Inventor 张亚璇林志榕李万阁艾慧胡进峰
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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