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Method for inhibiting precipitation clutter in radar echo

A radar echo and clutter technology, applied in radio wave measurement systems, instruments and other directions, can solve problems such as difficulty in distinguishing small targets from clutter, affecting the crew's judgment of surrounding targets, and increasing navigation risks, so as to strengthen small targets, Long-lasting, highly applicable effects

Active Publication Date: 2012-01-04
镇江光宁航海电子科技有限公司
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Problems solved by technology

However, it is difficult to distinguish small targets from clutter with such a processing method.
According to the actual test, in the environment with great influence of rain and snow, the traditional filter will filter out the short-distance small target and clutter together
Such treatment greatly affects the crew's judgment on surrounding targets and increases the risk of navigation

Method used

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  • Method for inhibiting precipitation clutter in radar echo
  • Method for inhibiting precipitation clutter in radar echo
  • Method for inhibiting precipitation clutter in radar echo

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Such as Figure 1-5 Shown: a method for suppressing rain and snow clutter in radar echoes, the steps of the method are as follows: first scan the radar echoes to obtain radar echo images; then on the basis of radar echo images, according to the distribution formula of rain and snow noise : or , pattern matching is performed on the radar echo image, and the distribution areas of rectangular, circular, and polygonal signals are identified; then, according to the distribution of close-range clutter in different signal areas, which approximates a normal distribution, and long-distance clutter approximates a Rayleigh distribution characteristics, use dyeing points to mark the suspected targets; the fourth step uses the filter to separate the suspected rain and snow clutter signals; the fifth step performs rain and snow clutter identification on th...

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Abstract

The invention discloses a method for inhibiting precipitation clutter in radar echo, which comprises the following steps of: firstly, inputting a radar echo image, carrying out mode matching on the radar echo image according to a precipitation noise distributing formula and recognizing the distributing areas of different signals; secondly, marking a suspected target in a dye spot way according tothe distributing characteristics of clutter in different signal areas; then, separating a suspected precipitation clutter signal by a filter and carrying out precipitation clutter recognition on the separated suspected precipitation clutter signal; after carrying out secondary scanning separation on a hidden small target in the precipitation clutter, transmitting a non-precipitation clutter smalltarget to the radar echo image in which the target signal is located; meanwhile, filtering the recognized precipitation clutter; and finally, after properly strengthening the target signal in the processed radar echo image, inputting the target signal into a display system. The invention can carry out effective clutter removal on the radar echo image in severe weather, such as precipitation, and the like.

Description

technical field [0001] The invention relates to a clutter suppression method, in particular to a method for suppressing rain and snow clutter in radar echoes. Background technique [0002] The basic principle of radar is relatively simple, it works by radiating electromagnetic energy and detecting the echoes reflected by reflectors (targets). The characteristics of the echo signal provide information about the target. The distance to the target is obtained by measuring the time it takes for the radiant energy to travel to the target and back. The bearing of the target is identified by measuring the angle of arrival of the echo signal from a directional antenna (antenna with a narrow beam). [0003] In the process of radar microwave transmission and reception, due to the rain and snow generated by natural reasons, there will be clutter in the process of radar microwave transmission and reception, especially the echo image. Due to the existence of rain and snow clutter, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 杨大宁张旭升杨世光
Owner 镇江光宁航海电子科技有限公司
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