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A Sea Clutter Suppression Method for Sky-Wave Radar Based on Prior Knowledge

A technology of prior knowledge and sea clutter, applied in the field of radar, can solve problems such as not considering prior knowledge information, sea clutter suppression performance needs to be improved, etc. Increased clutter suppression effect

Active Publication Date: 2020-12-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a sky-wave radar sea clutter suppression method based on prior knowledge for the problem that the existing sky-wave radar sea clutter suppression algorithm does not consider prior knowledge information, resulting in the sea clutter suppression performance to be improved , the effect of suppressing sea clutter has been significantly improved

Method used

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  • A Sea Clutter Suppression Method for Sky-Wave Radar Based on Prior Knowledge
  • A Sea Clutter Suppression Method for Sky-Wave Radar Based on Prior Knowledge
  • A Sea Clutter Suppression Method for Sky-Wave Radar Based on Prior Knowledge

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Embodiment 1

[0075] Compare the sea clutter suppression algorithm based on prior knowledge with the optimal filter sea clutter suppression algorithm:

[0076] figure 2 is the 230th distance unit spectrogram, from image 3 It can be seen from the figure that there is a target signal at 4.72Hz in the distance unit, and the target signal has a low amplitude and is covered by a strong sea clutter signal; Figure 4 SCNR is the normalized output of the 230th range unit; (a) is the result of the optimal filtering algorithm; (b) is the result of the sky-wave radar sea clutter suppression algorithm based on prior knowledge; from Figure 4 It can be seen from (a) that after optimal filtering, the maximum residual sea clutter is at 16.44Hz, and its signal-to-noise ratio is -5.433dB; from Figure 4 It can be seen from (b) that after processing by the sea clutter suppression method based on prior knowledge, the maximum residual sea clutter is at 16.76Hz, and its signal-to-noise ratio is -6.624dB; t...

Embodiment 2

[0079] Performance comparison between sea clutter suppression algorithm based on prior knowledge and optimal filtering algorithm:

[0080] In this embodiment, the measured sky-wave radar sea clutter data is used; in order to facilitate performance analysis, the Doppler frequency is added to the 144th range unit as f d = 1 Hz target, the input SINR of the target signal varies from -30dB to -10dB.

[0081] Such as Figure 5 is the sea clutter suppression performance curve of sky wave radar with different input SCNR; after sea clutter suppression, the SCNR of the maximum residual sea clutter signal will affect the target detection; therefore, the performance of sea clutter suppression depends on the maximum residual sea clutter signal after filtering The SCNR of sea clutter, when the difference between the target signal and the maximum residual sea clutter is larger, the target is easier to be detected. The output SNR here is defined as the difference between the SNR of the tar...

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Abstract

The invention belongs to the technical field of radar, and provides a knowledge-assisted sky-wave radar sea clutter suppression method to overcome the problem that the sea clutter suppression performance needs to be improved due to prior knowledge information not considered in the existing method. The present invention first uses the radar carrier frequency and pulse repetition period in the sky-wave radar as prior knowledge, uses the characteristics of sea clutter to model the sea clutter, and then adds the established sea clutter prior knowledge model to the optimal filter design , through an adaptive weight calculation scheme, the optimal sea clutter model is obtained; using this model, a sea clutter suppression method for sky-wave radar based on prior knowledge is obtained. The present invention is suitable for sky-wave radar sea clutter suppression, is an algorithm that reasonably combines prior knowledge and optimal filtering algorithm, and can significantly improve the sea clutter suppression effect on the basis of the current algorithm.

Description

technical field [0001] The invention belongs to the technical field of radar, relates to a sky-wave radar sea clutter suppression method, and specifically provides a knowledge-assisted sky-wave radar sea clutter suppression method. Background technique [0002] In sky-wave radar, the Doppler spectrum of echoes from ships and other slow targets is close to the strong sea clutter spectrum and is easily covered by sea clutter. Therefore, suppressing sea clutter is one of the key issues in detecting slow ship targets and has received extensive attention. [0003] The existing sea clutter suppression methods are mainly divided into three categories: 1) methods based on sea clutter signal reconstruction and cancellation, such as loop cancellation method (Root B T.HF over-the-horizon radar ship detection with short dwells using cl utter cancellation. Radio Science, 1998,33(4); 1095-1111.) and the cancellation method based on amplitude phase estimation (X Guo, J Ni, G Liu. The Ship...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 胡进峰曹健鲍伟伟姚冯陈卓蔡雷雷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA