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Airborne radar moving target detection method and device, equipment and storage medium

A technology of moving target detection and airborne radar, which is applied in the directions of measuring devices, radio wave measurement systems, radio wave reflection/reradiation, etc., can solve problems such as not considering the space-time coupling characteristics of clutter and difficulty in obtaining detection results, etc. Achieving good performance and high estimation accuracy

Inactive Publication Date: 2022-01-14
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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  • Claims
  • Application Information

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Problems solved by technology

However, this type of method does not consider the space-time coupling characteristics of clutter caused by the airborne motion platform, and it is difficult to achieve better detection results in the case of a single sample

Method used

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  • Airborne radar moving target detection method and device, equipment and storage medium
  • Airborne radar moving target detection method and device, equipment and storage medium
  • Airborne radar moving target detection method and device, equipment and storage medium

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Embodiment 1

[0051] The ultimate goal of estimating the covariance matrix is ​​target detection. The traditional detection method regards clutter and noise as a whole, assuming that it satisfies a specific statistical distribution, and then derives a series of statistics suitable for various types of clutter based on binary hypothesis testing. characteristic detector. However, this method does not consider the space-time coupling characteristics of clutter caused by the airborne motion platform, and it is difficult to achieve better detection results in the case of a single sample. This embodiment provides an airborne radar moving target detection method aimed at overcoming the above defects. By approximately expressing the clutter components in the single-snapshot echo signal as a weighted sum of subspace vectors, the improved least squares, maximum likelihood The natural estimation method estimates the clutter, noise and target amplitude, and finally obtains a detector suitable for airbo...

Embodiment 2

[0094] see Figure 5 , as attached Figure 5 Shown is a structural block diagram of the airborne radar moving target detection device provided by this embodiment.

[0095] Specifically, the device includes:

[0096] The signal acquisition module is used to receive the echo signal of the single-snapshot distance unit and obtain the covariance matrix of the echo signal of the single-snapshot distance unit, obtain the parameters of the radar transmission signal and obtain the clutter according to the parameters of the radar transmission signal basis matrix;

[0097] A noise calculation module, configured to calculate Gaussian white noise under the first condition and Gaussian white noise under the second condition according to the covariance matrix and the clutter basis matrix; wherein, the first condition is x=c+n, The second condition is x=μs+c+n, x is a space-time snapshot of a single range unit, s represents a target signal vector, μ is a target amplitude, c is a clutter s...

Embodiment 3

[0102] This preferred embodiment provides a computer device, which can implement the steps in any embodiment of the airborne radar moving target detection method provided in the embodiments of the application, and therefore, can realize the computer equipment provided in the embodiments of the application. The beneficial effects of the radar-borne moving target detection method are detailed in the previous embodiments, and will not be repeated here.

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Abstract

The invention discloses an airborne radar moving target detection method and device, equipment and a storage medium. The method comprises the steps: receiving an echo signal of a single snapshot distance unit, obtaining a covariance matrix of the echo signal of the single snapshot distance unit, obtaining a radar emission signal parameter, and obtaining a clutter basis matrix according to the radar emission signal parameter; calculating Gaussian white noise under a first condition and Gaussian white noise under a second condition according to the covariance matrix and the clutter basis matrix; calculating to obtain a generalized likelihood ratio detector; and detecting a moving target through a generalized likelihood ratio detector. According to the radar target detection method based on the generalized likelihood ratio test, clutter components in single-snapshot echo signals are approximately expressed as subspace vector weighted sums; then improved least square and maximum likelihood estimation methods are adopted to estimate clutter, noise and target amplitude; and finally, the detector suitable for the airborne radar to detect the moving target in the non-uniform environment is obtained.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to an airborne radar moving target detection method, device, equipment and storage medium. Background technique [0002] The severe ground / sea clutter environment faced by airborne radar looking down detection, whether using STAP technology to suppress clutter or directly using GLRT detector to detect targets, it is necessary to obtain the covariance matrix of the current detection unit. The traditional method is to estimate the covariance matrix through the independent and identically distributed samples of the distance units around the unit to be detected, but it is difficult to obtain the covariance matrix accurately due to the limitation of the number of samples and the non-uniform environment. In order to solve the problem of covariance matrix estimation under a small number of distance samples, knowledge-based STAP methods such as maximum likelihood...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S13/50G01S7/28
CPCG01S7/41G01S13/50G01S7/2813
Inventor 李锐洋杨政旷生玉梁璟黄明军李复名徐才进
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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