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S-wave band Doppler radar breaking wave interference suppression method and device

A Doppler radar and interference suppression technology, which is applied in the field of S-band Doppler radar breaking wave interference suppression, and can solve problems such as the influence of sea state parameter accuracy

Active Publication Date: 2016-04-13
WUHAN UNIV
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Problems solved by technology

[0005] The existing microwave Doppler radar method for dealing with breaking wave interference is to extract the center frequency of the Doppler spectrum of breaking wave interference data as a singular point from a frequency sequence for a period of time, and then discard the frequency value at the corresponding position. The data equivalent to breaking wave interference is eliminated, and the data vacancy at the time of breaking wave occurrence will have a great impact on the accuracy of radar extraction of sea state parameters

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  • S-wave band Doppler radar breaking wave interference suppression method and device
  • S-wave band Doppler radar breaking wave interference suppression method and device
  • S-wave band Doppler radar breaking wave interference suppression method and device

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Embodiment 1

[0077] Microwave Doppler radar emits electromagnetic waves through the antenna to irradiate and detect the sea surface. According to the wave mixed surface scattering theory and the linear wave theory, the ocean surface scattering echo contains ocean information. The radar obtains the sea surface through a series of inversion algorithms for ocean echo data. state parameters.

[0078] Such as figure 1 As shown, area A is the sea surface situation when breaking waves occur, and area B is the general situation. The echo power received by the radar can be expressed as

[0079] P r = P t GA e σ ( 4 π ) 2 R 4 ...

Embodiment 2

[0124] The device embodiment 2 of the present invention and the method embodiment 1 belong to the same technical concept. Please refer to the method embodiment 1 for details not described in detail in the device embodiment 2.

[0125] like Figure 7 As shown, a kind of S-band Doppler radar breaking wave interference suppressing device of the present invention comprises:

[0126] The breaking wave range element position acquisition unit is used to acquire a set of radar echo FT1 data and perform preprocessing to obtain the bandwidth, center frequency and energy of all range element Doppler spectra, and obtain each frame of data fragmentation according to the energy and center frequency the position of the distance element of the wave;

[0127] The bandwidth threshold range acquisition unit is used to obtain the data of all distance elements in this set of data to obtain a bandwidth threshold range, wherein the bandwidth threshold range is from the minimum value to the maximum ...

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Abstract

The invention discloses an S-wave band Doppler radar breaking wave interference suppression method and device and belongs to the radar signal processing field. According to the S-wave band Doppler radar breaking wave interference suppression method and device of the invention, based on original S-wave band Doppler radar signal processing, an empirical mode decomposition method is adopted to decompose breaking wave interfered radar echo signals into a plurality of intrinsic mode functions; and based on a characteristic that the frequency of breaking wave signals is high relative to general sea echo signals, components with high frequency are removed from all the intrinsic mode functions, and the other intrinsic mode functions are reconstructed, so that breaking wave suppressed signals can be obtained. When the method and device of the invention are used for actual data processing, the application effects of the method and device are excellent, and useful signals are not damaged when breaking wave interference is suppressed, and processing effects are obvious, and radar detection precision can be improved.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a method and device for suppressing breaking wave interference of S-band Doppler radar. Background technique [0002] Ocean waves are a sea surface phenomenon formed by the ups and downs of sea surface water particles. The effective measurement of ocean waves is of great significance to coastal engineering construction, marine resource exploration, and marine disaster prevention. Microwave Doppler radar has the advantages of small environmental interference, high measurement accuracy, light volume, and can accurately reflect the details of sea surface changes. It expands the means of sea state measurement and improves the ability of ocean monitoring. Research is of great value. [0003] When the ocean waves are strong, the waves on the sea surface often break up, and the water particles on the sea surface move faster, leaving the sea surface to form white waves. This kind ...

Claims

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 陈泽宗易盛张龙刚赵晨陈曦陈溯
Owner WUHAN UNIV
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