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Navigation radar co-frequency interference inhibition method based on spatial correlation

A technology of spatial correlation and marine radar, applied in radio wave measurement systems, instruments, etc., can solve uninvolved problems, and achieve the effect of reducing false positive rate, good spatial correlation, and fast filtering characteristics

Active Publication Date: 2016-02-10
HARBIN ENG UNIV
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Problems solved by technology

Although the above-mentioned filtering method filters in the spatial domain, it uses template detection or threshold segmentation technology for filtering, which does not involve the use of the correlation of sea clutter in the space domain and the determination of the non-correlation between co-frequency interference noise and sea clutter in the present invention. Threshold to remove co-channel interference noise

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  • Navigation radar co-frequency interference inhibition method based on spatial correlation
  • Navigation radar co-frequency interference inhibition method based on spatial correlation
  • Navigation radar co-frequency interference inhibition method based on spatial correlation

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Embodiment Construction

[0039] The X-band marine radar co-channel interference suppression method based on spatial correlation proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings. For the flow chart of the implementation, see Image 6 Specifically, it can be divided into the following steps. The first step is to read the original radar image; the second step is to use the correlation coefficient method to detect the noise line; the third step is to repair the noise line of the radar image.

[0040] combined with Figure 1~6 , the concrete steps of the present invention are:

[0041] The first step is to read the original radar image, use the radar image processing software to load the continuous image of space sea clutter, and simultaneously record the image sampling points, bus number, azimuth, display mode and other information. attached figure 1 It is a part of the original radar image in the Cartesian coordinate system. The ...

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Abstract

The invention provides a navigation radar co-frequency interference inhibition method based on spatial correlation. The method comprises the steps of: loading spatial sea area clutter continuous images, and synchronously recording an image sampling point number, a bus number, a direction number and a display mode; utilizing correlation among radar image signals in a spatial domain, carrying out correlation coefficient calculation on adjacent storage lines; carrying out classified statistics on correlation coefficient histograms of signal lines and noise lines, drawing corresponding probability density curves, utilizing a fixed threshold method to determine detection thresholds; and judging the noise lines and the signal lines through the detection thresholds; and utilizing a close line substitution method to restore the noise lines detected out. Aimed at the distribution characteristic that co-frequency interference on the radar images is represented as rayed noise in the radial direction, the sea clutter spatial correlation is utilized for noise detection, noise pre-processing is carried out on original radar images, the co-frequency interference is filtered out, and the sea wave parameter inversion precision is improved.

Description

technical field [0001] The invention relates to a method for suppressing co-frequency interference of X-band marine radar images. Background technique [0002] When X-band marine radar is used for telemetry of ocean waves, the raw radar images directly collected often have a lot of interference noise, the most common of which are co-frequency interference, solid object interference and rainfall interference. Among them, co-frequency interference is more serious, because its echo intensity is relatively large, and the range will spread throughout the entire radar image, which directly affects the inversion accuracy of ocean wave information. Therefore, the removal of co-frequency interference noise is of great significance to improve the inversion accuracy of ocean wave information. [0003] The same-frequency interference of radar means that when two or more radars of the same type work together in adjacent areas, due to the same carrier frequency (also known as transmissio...

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 卢志忠周颖黄玉王慧卫延波向拓
Owner HARBIN ENG UNIV
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