Multi-frame coherent tbd method with improved envelope shift compensation and fractional Fourier transform

A fractional Fourier, fractional technique applied in the field of multi-frame coherent TBD

Inactive Publication Date: 2017-07-04
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 with improved envelope shift compensation and fractional Fourier transform
  • Multi-frame coherent tbd method with improved envelope shift compensation and fractional Fourier transform
  • Multi-frame coherent tbd method with improved envelope shift compensation and fractional Fourier transform

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Embodiment Construction

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

[0037] Establish a maneuvering target echo data model:

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

[0039]

[0040] (1) where A r is the amplitude of the echo data, t m =mT r +(k-1)NMT r +(n-1)MT r is the slow time, k=1,...,K is the kth frame data, n=1,...,N is the nth azimuth unit, m=1,...,M, t'=t- mTr is fast time, T r represents the pulse repetition time, where M represents the number of pulses in the coherent processing time, f c Indicates ...

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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 in particular relates to a multi-frame coherent TBD method for improving envelope displacement compensation and fractional Fourier transform. Background technique [0002] At present, as countries around the world pay more attention to the use and control of the geospace environment, the strategic position of the geospace 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's space, the detection and identification technology of space targets 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 monitor, identify and track space targets in real time during ...

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Application Information

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Patent Type & Authority Patents(China)
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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