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Extended target sensitivity detector and system during subspace signal mismatch

A technology for expanding targets and detectors, which is applied in the field of expanding target-sensitive detectors and systems, and can solve problems such as low target detection performance

Inactive Publication Date: 2021-03-26
AIR FORCE EARLY WARNING ACADEMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above detection problems, the present invention provides an extended target sensitive detector when subspace signals are mismatched, so as to overcome the problem of low target detection performance in the prior art

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  • Extended target sensitivity detector and system during subspace signal mismatch
  • Extended target sensitivity detector and system during subspace signal mismatch
  • Extended target sensitivity detector and system during subspace signal mismatch

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Embodiment Construction

[0064] In order to make the objects and advantages of the present invention clearer, the present invention will be further described below in conjunction with the examples; it should be understood that the specific examples described here are only for explaining the present invention, and are not intended to limit the present invention.

[0065] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.

[0066] For the system channel number is Multi-channel radars such as phased array or MIMO, assuming extended targets occupy continuous range units, the radar received data is available dimension matrix , and can be written as:

[0067] (1)

[0068] In the formula, dimension matrix represents the ...

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Abstract

The invention relates to an extended target sensitivity detector and a system during subspace signal mismatch, and the method comprises the steps: firstly constructing a to-be-detected data matrix, asignal matrix and a training sample matrix, then constructing a sampling covariance matrix through the training sample matrix, and then constructing a whitening matrix through the sampling covariancematrix; whitening the to-be-detected data matrix and the signal matrix by utilizing the whitening matrix, constructing a detection statistic by utilizing the whitened data matrix, determining a detection threshold by utilizing the detection statistic and a false alarm probability, finally comparing the detection statistic with the detection threshold, and judging whether a target exists or not. Onthe basis of the self-adaptive detection idea, mismatch sensitive target detection under signal mismatch is achieved, the method is suitable for extended target detection based on a subspace model, and the detector has the constant false alarm characteristic and does not need independent constant false alarm processing.

Description

technical field [0001] The invention relates to the technical field of radar signal detection, in particular to an extended target sensitive detector and system when subspace signals are mismatched. Background technique [0002] No matter how radar technology develops, target detection has always been one of the important functions of radar. With the development and progress of radar technology, the resolution of radar is continuously improved, and the target often occupies multiple range units, showing the characteristics of expansion. This allows for an increase in radar target detection performance due to the reduced clutter component in the radar return for each range cell. [0003] However, the environment faced by radar is becoming more and more complex. On the one hand, the intensity of radar clutter is often much greater than that of radar echoes; interfering signal, which will cause signal mismatch. [0004] Therefore, in order to ensure the effectiveness of the ...

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Application Information

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IPC IPC(8): G01S7/41G01S7/02
CPCG01S7/023G01S7/414
Inventor 刘维建李槟槟周必雷杜庆磊陈辉王永良
Owner AIR FORCE EARLY WARNING ACADEMY
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