Extraction method of first-order echo spectrum of ground-wave radar in strong interference environment based on multi-domain information

A ground wave radar and strong interference technology, which is applied in the field of ground wave radar first-order echo spectrum extraction, can solve problems such as difficult to accurately extract the first-order echo spectrum, and achieve the goal of improving the distinguishability, enhancing the interference resistance, and improving the extraction ability Effect

Inactive Publication Date: 2019-06-25
THE FIRST INST OF OCEANOGRAPHY SOA
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Problems solved by technology

Under their interference, it is difficult to accurately extract the first-order echo spectrum

Method used

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  • Extraction method of first-order echo spectrum of ground-wave radar in strong interference environment based on multi-domain information
  • Extraction method of first-order echo spectrum of ground-wave radar in strong interference environment based on multi-domain information
  • Extraction method of first-order echo spectrum of ground-wave radar in strong interference environment based on multi-domain information

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Embodiment Construction

[0040] Below in conjunction with formula and accompanying drawing, method of the present invention is described further:

[0041] Such as figure 1 As shown, the first-order echo spectrum extraction method under the strong interference environment using the multi-domain information of high-frequency ground wave radar mainly includes constructing the multi-domain spectrum and formulating constraints, enhancing the power of the first-order echo spectrum, and searching for the maximum SINR The way to extract the first-order echo spectrum, the specific steps are as follows:

[0042] Step 1: The utilization period is T seconds (attached Figure 4 , 5 In 300s as an example), the ground wave radar multi-channel down-converted signal is processed by matched filtering and coherent accumulation, and the multi-channel range-Doppler spectrum is weighted in space and takes the maximum value in each direction to form Range domain-Doppler-azimuth spectrum, denoted as s(r,f,θ), its physical...

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Abstract

A multi-domain information based ground wave radar first-order echo spectrum extracting method in a strong interference environment includes forming a ground wave radar distance domain-Doppler-azimuth polydomain spectrum through utilizing a multi-channel ground wave radar distance-Doppler spectrum subjected to wave beam formation and Chebyshev weight selection, setting necessary window and restriction conditions in a distance domain, a Doppler domain and an azimuth domain, calculating a first-order echo spectrum power in a multi-domain value window and the restriction condition, enhancing he first-order echo spectrum and reducing interference power for achieving an aim of jamming prevention, and acquiring first-order echo spectrum peak value frequency and spectrum widening volume through maximum signal to interference plus noise ratio searching and implementing first-order echo spectrum extraction. According to the invention, a defect of failure of a prior first-order echo spectrum extraction method in a strong interference environment is made up. Through configured ground wave radar multi-dimensional spectrum, different features of first-order echo, and ionized stratum and ship echo interference in multiple domains are considered comprehensively and a corresponding anti-interference extraction strategy is made, so that ground wave radar first-order echo spectrum effective extraction is realized.

Description

technical field [0001] The invention relates to a method for detecting and extracting a first-order echo spectrum, in particular to a method for extracting a first-order echo spectrum of a ground wave radar in a strong interference environment based on multi-domain information. Background technique [0002] Ground wave radar sea clutter is the signal scattered back by the interaction between high-frequency radio waves emitted by the radar and ocean waves. It is divided into first-order, second-order and high-order ocean echoes. Among them, the first-order echo is the first-order resonance echo generated by the waves received by the radar and half the wavelength of the electromagnetic wave it radiates. The first-order echo spectrum is the Doppler spectrum of the echo, which appears as a pair of broadened double peaks in the spectrum, with strong energy, and is the most common main component of ocean echo. Its impact on the application of ground wave radar is divided into two...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 王祎鸣张杰纪永刚
Owner THE FIRST INST OF OCEANOGRAPHY SOA
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