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Marine radar rain and snow clutter suppression algorithm

A clutter suppression, marine radar technology, applied in the direction of using re-radiation, radio wave measurement system, radio wave reflection/re-radiation, etc., can solve the problem of unsatisfactory detection effect and so on

Active Publication Date: 2021-05-14
CSSC MARINE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is limited to a large extent by the characteristics of the STC suppression curve being small and far away, so the detection effect is not ideal for distant targets even when the rain and snow clutter is weak.

Method used

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  • Marine radar rain and snow clutter suppression algorithm
  • Marine radar rain and snow clutter suppression algorithm
  • Marine radar rain and snow clutter suppression algorithm

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Experimental program
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Embodiment Construction

[0031] The technical solution of the present invention is further described below in conjunction with specific embodiments:

[0032] A marine radar rain and snow clutter suppression algorithm, such as figure 1 shown, including the following steps:

[0033] S1. The radar antenna scans the surrounding environment clockwise in the form of pulse signal transmission; in the process of rotating scanning, it detects the environment at a specific frequency (related to the selected range). The receiver converts the analog echo into a digital signal after mixing, amplifying, detecting, AD sampling, quantizing and encoding to form discrete scan line information;

[0034] Each antenna rotation cycle samples 4096 scan lines, and each scan line includes 1024 sampling points (or 2048, related to the selected range); as the antenna rotates, each scan line performs real-time update on the corresponding azimuth;

[0035] S2. During the antenna rotation period, pulse accumulation is performed ...

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Abstract

The invention relates to a marine radar rain and snow clutter suppression algorithm which comprises the steps of reading scanning line data, reading rain and snow clutter suppression parameters, establishing a sliding window matrix I and a sliding window matrix II, respectively calculating the average value of the amplitude in the sliding window matrix I, and performing weighted calculation according to the average amplitude value in the sliding window matrix I and the average amplitude value in the sliding window matrix II to obtain rain and snow clutter weighted amplitude values of all points of the current scanning line, and performing calculation to obtain the amplitude value of the current scanning line after rain and snow suppression. Through the algorithm, the rain and snow clutter estimation value is closer to the echo characteristics of the actual rain and snow clutter, the amplitude of the target echo is reserved, the rain and snow clutter can be inhibited as much as possible, and the influence on the target can be reduced to the minimum.

Description

technical field [0001] The invention relates to the field of marine radar, in particular to a rain and snow clutter suppression algorithm for marine radar. Background technique [0002] Marine radar is an all-weather and all-weather core navigation equipment, the eyes of ships, and it is related to the national coastal defense and maritime security. Especially in rainy and snowy weather conditions, the driver's visual effect is poor and he relies more on marine radar. However, the detection and tracking performance of marine radar is often affected by electromagnetic waves scattered by rain, snow, and low-level cloud surfaces. Electromagnetic waves scattered by rain, snow and clouds are also called rain and snow clutter. The appearance of rain and snow clutter will lead to or increase the false alarm probability, or reduce the detection probability of the target when the false alarm rate is constant. [0003] In order to correctly distinguish the target and the surroundin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/937G01S7/41
CPCG01S13/937G01S7/414Y02A90/10G01S7/2922G01S13/42
Inventor 胡杰张启明王鸿显孙为康胡文妹徐畅高歌温建新侯波郭富海
Owner CSSC MARINE TECH CO LTD
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