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Method for computing external illuminator radar cross-ambiguity function utilizing sparse Fourier transform

A technology of external radiation source radar and mutual ambiguity function, which is applied to radio wave measurement systems, instruments, etc., can solve the problem of large amount of calculation and achieve the effect of reducing the amount of calculation

Inactive Publication Date: 2013-10-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

For long-term accumulated CAF, the amount of calculation is large

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  • Method for computing external illuminator radar cross-ambiguity function utilizing sparse Fourier transform
  • Method for computing external illuminator radar cross-ambiguity function utilizing sparse Fourier transform
  • Method for computing external illuminator radar cross-ambiguity function utilizing sparse Fourier transform

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Embodiment Construction

[0057] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be pointed out that the described embodiments are only intended to facilitate understanding of the present invention and do not serve as any limitation.

[0058] The present invention proposes a method for calculating the mutual ambiguity function of the external radiation source radar by using sparse Fourier transform, and obtains the frequency domain of the conjugate product of a certain time delay of the echo and the direct wave through the sparse Fourier transform, as the CAF at this time Postpone results. In order to verify the present invention, computer simulations were carried out. The following combination figure 1 A general flow of an embodiment of the present invention is given.

[0059] Step 1: Multiply er(n)=echo(n+m)·refr by the conjugate point of echo(n+m) received by the external radiation source radar antenna and the ...

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Abstract

The invention relates to a method for computing an external illuminator radar cross-ambiguity function utilizing the sparse Fourier transform and belongs to the field of radar target acquisition processing. Firstly, point multiplication is carried out on direct wave signals and echo delay signals to construct a new vector, wherein the direct wave signals are received by an external illuminator radar antenna, and filtering and down extraction are carried out on the direct wave signals. Secondly, the sparse Fourier transform is carried out on the new vector, and therefore a Doppler tangent plane result of the cross-ambiguity function on the delay point is obtained. Lastly, parameters like target Doppler frequency shift can be estimated through the sparse Fourier transform results. Compared with a traditional method that cross-ambiguity function operation is carried out on the external illuminator radar through the Fourier transform, the method utilizes the sparse Fourier transform to solve the cross-ambiguity function and can greatly reduce operand of the cross-ambiguity function under the condition of long-time accumulation according to the characteristics that the number of targets appearing in the air in reality is limited and the targets have sparsity.

Description

technical field [0001] The invention relates to a method for calculating the mutual ambiguity function of external radiation source radar by using sparse Fourier transform, which belongs to the technical field of radar target detection, and particularly relates to a method for reducing the mutual ambiguity of digital TV external radiation source radar under the condition of long-term coherent accumulation Methods for function operands. Background technique [0002] External radiation source radar is a bistatic / multistatic radar that uses non-cooperative radiation sources such as TV signals and FM broadcast signals as irradiation sources. The target parameters are included in the target echo, and the external radiation source radar system uses the direct wave received by the reference antenna and the target echo signal received by the echo channel to perform mutual ambiguity function processing. The existence of the target corresponds to the peak value on the mutual ambiguit...

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Application Information

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IPC IPC(8): G01S7/41
Inventor 陶然刘升恒张果单涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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