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Multi-frame coherent TBD method for improving envelope shifting compensation and fractional order Fourier transformation

A fractional Fourier, coherent technique, applied to the reflection/re-radiation of radio waves, the use of re-radiation, measurement devices, etc.

Inactive Publication Date: 2015-05-06
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology

[0007] At present, there has not been any relevant research results that shift multi-frame echo data to a range unit and perform fractional Fourier transform to effectively accumulate target energy and use it to detect ultra-high-speed maneuvering targets in space

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  • Multi-frame coherent TBD method for improving envelope shifting compensation and fractional order Fourier transformation
  • Multi-frame coherent TBD method for improving envelope shifting compensation and fractional order Fourier transformation
  • Multi-frame coherent TBD method for improving envelope shifting compensation and fractional order Fourier transformation

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Embodiment Construction

[0036] The following describes in detail the multi-frame coherent TBD method with improved envelope shift compensation and fractional Fourier transform provided by the present invention with reference to the accompanying drawings and specific embodiments.

[0037] Establish the echo data model of the maneuvering target:

[0038] Space-based radar works in the detection and tracking mode, and scans the airspace 4 times, that is, receives 4 frames of data, and divides the detected airspace into 10 azimuths, then the kth frame and the nth azimuth unit undergo pulse compression The expression of the processed maneuvering target echo signal is:

[0039] s r ( r ^ , t m ) = A r sin c [ π r ^ - ( R 0 + v 0 t m + 1 2 a 0 t m 2 ) ρ r ] exp ( - j 4 π λ R 0 ) exp ( - j 4 π λ v 0 t m ) exp ( - j 2 π λ a ...

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Abstract

The invention discloses a multi-frame coherent TBD method for improving envelope shifting compensation and fractional order Fourier transformation. The multi-frame coherent TBD method comprises the steps of firstly storing multi-frame echo data received by a space-based radar in a data matrix, taking out data in one azimuth unit of each frame one by one, arranging the data together, using the data as target echo data to be processed, calculating distance moving amount of a target in all azimuth units based on space target parameter prior information, shifting the taken echo data to a distance unit according to the calculated distance moving amount, finally conducting phase compensation on the echo data shifted to one distance unit so as to perform fractional order Fourier transformation, using a result obtained through fractional order Fourier transformation to perform constant false-alarm detection processing so as to judge whether the target exists or not. By means of the multi-frame coherent TBD method, a maneuvering target can be effectively detected under the situation of low signal-to-noise ratio, and accordingly the effectiveness of the method is verified.

Description

Technical field [0001] The invention belongs to the technical field of multi-frame radar signal processing and maneuvering target detection, and particularly relates to a multi-frame coherent TBD method for improving envelope shift compensation and fractional Fourier transform. Background technique [0002] At present, as countries in the world pay more attention to the use and control of the earth space environment, the strategic position of the earth space environment is undergoing an important evolution. In high-tech warfare with information warfare at its core, space is irreplaceably playing an increasingly important role. If you want to control the earth and space, space target detection and recognition technology is one of the important technical means to achieve this task. Developed countries also attach great importance to the development of space target detection technology, and strive to achieve real-time surveillance, identification, and tracking of space targets in p...

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Application Information

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IPC IPC(8): G01S7/41G01S13/56
CPCG01S7/41G01S13/56
Inventor 李海马頔吴仁彪
Owner CIVIL AVIATION UNIV OF CHINA
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