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Navigation radar rain and snow clutter suppression method based on clutter envelope

A clutter suppression and navigation radar technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as excessive suppression, high target suppression, and jamming targets, and achieve improved suppression effects, improved shielding effects, and improved target strength. Effect

Pending Publication Date: 2022-04-15
HAIHUA ELECTRONICS ENTERPRISECHINA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the existing marine radar rain and snow clutter suppression algorithm, two sliding windows are used to calculate the mean value of the sliding window of the adjacent points of the target point and the mean value of the sliding window of the adjacent points of the target point in the first three scanning lines, and the rain The estimated value of snow clutter can accurately estimate the magnitude of rain and snow clutter, but the suppression of the target is also greater when there is suppression of rain and snow clutter, and it is easily affected by the interference target of the first three scans, resulting in excessive suppression
[0006] And the rain and snow interference suppression method based on moving summation deviation and STC control, the method determines the length of deviation data according to the range and suppression gain, and then determines the moving summation deviation coefficient, uses the moving summation deviation coefficient to weight the echo data, combined with The STC curve determines the detection threshold, detects the target and suppresses the rain and snow clutter, but this method has the problem that the suppression effect of the rain and snow clutter on the long-distance target is not ideal.

Method used

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  • Navigation radar rain and snow clutter suppression method based on clutter envelope
  • Navigation radar rain and snow clutter suppression method based on clutter envelope
  • Navigation radar rain and snow clutter suppression method based on clutter envelope

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Experimental program
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Embodiment

[0064] like figure 1 As shown, the present embodiment provides a navigation radar rain and snow clutter suppression method based on clutter envelope, comprising the following steps:

[0065] Step 1: determine the rain and snow interference suppression work parameters, the work parameters include navigation radar rain and snow clutter suppression work mode, suppression strength k, in the present embodiment, the suppression strength k is set to k=50;

[0066] Step 2: Read the current azimuth echo data;

[0067] During the rotation period of the radar antenna, information scanning is performed on the transmitted pulse signal for each azimuth, and an echo data vector Y is obtained by scanning an azimuth. n , is the amplitude of the echo sampling point on the scanning azimuth;

[0068] Y n ={y n (1),y n (2),y n (3),...,y n (i),...,y n ((N_max))},

[0069] i={1,2,3,...,i,...,N_max{,

[0070] n represents the nth lap scan.

[0071] The navigation radar antenna rotates once...

Embodiment 2

[0134] This embodiment provides a rain and snow clutter suppression system based on smooth echo data and clutter power smooth envelope threshold, including: parameter preset module, echo data acquisition module, smooth echo data module, clutter power estimation Value calculation module, smooth inner envelope calculation module, mean filter module, detection threshold calculation module, target detection module;

[0135] In this embodiment, the parameter preset module is used to preset rain and snow interference suppression working parameters, and the working parameters include the working mode and suppression strength of navigation radar rain and snow clutter suppression;

[0136] In this embodiment, the echo data acquisition module is used to obtain the echo data of the current azimuth, and perform information scanning on the transmitted pulse signal of each azimuth within the rotation period of the radar antenna to obtain the echo data vector of each azimuth;

[0137] In thi...

Embodiment 3

[0144] This embodiment provides a storage medium. The storage medium may be a storage medium such as ROM, RAM, magnetic disk, or optical disk. The storage medium stores one or more programs. When the program is executed by the processor, the smoothing-based Rain and snow clutter suppression method based on wave data and clutter power smoothing envelope threshold.

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Abstract

The invention discloses a navigation radar rain and snow clutter suppression method based on clutter envelope. The method adopts a first-order model to iteratively update and calculate smooth echo data; smoothing echo data by adopting azimuth distance mean filtering; clutter power is weighted and estimated by adopting the maximum value and the minimum value of the average power of the sliding window; further solving a smooth inner envelope of the clutter power estimation value, and weighting the smooth inner envelope with the rain and snow clutter suppression intensity to obtain a detection threshold; according to the method, target detection and rain and snow clutter suppression are carried out, interference target shielding and clutter edge shielding can be effectively reduced, target information is better reserved, and a better rain and snow clutter suppression effect is obtained.

Description

technical field [0001] The invention relates to the technical field of marine radar, in particular to a navigation radar rain and snow clutter suppression method based on clutter envelopes. Background technique [0002] Marine navigation radar is the key navigation equipment for avoiding obstacles and collisions during ship navigation. Ships will encounter various complex weather environments when sailing at sea. Optical equipment observes surrounding navigation obstacles, especially relying on navigation radar to ensure navigation safety. However, while the navigation radar is detecting the target, the radar echo will also be seriously affected by the rain and snow clutter. For a long time, suppressing the rain and snow clutter has been one of the key issues in the signal processing and data processing of the marine radar. [0003] The rain and snow clutter suppression algorithm often inhibits the target to a certain extent while suppressing the rain and snow clutter, resu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 宋朋李猛陈以辉刘志勇
Owner HAIHUA ELECTRONICS ENTERPRISECHINA CORP