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Wavebeam domain adaptive interference suppression method based on null trough widening

A technology of null widening and interference suppression, which is applied in the field of data processing, can solve the problems of not being able to apply partial adaptive array processing structures, etc., and achieve economical and reasonable interference suppression, overcome the number of auxiliary beams, and the effects of motion and time-varying interference suppression

Active Publication Date: 2013-09-25
XIDIAN UNIV
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Problems solved by technology

[0004] The present invention proposes a beam domain adaptive interference suppression method based on improved nulling widening to solve the problem that the existing nulling widening method cannot be applied to a part of the adaptive array processing structure, and improve the performance of radar platform movement or Disturbance suppression performance in case of disturbing motion

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  • Wavebeam domain adaptive interference suppression method based on null trough widening
  • Wavebeam domain adaptive interference suppression method based on null trough widening
  • Wavebeam domain adaptive interference suppression method based on null trough widening

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Embodiment Construction

[0030] In order to clearly illustrate the specific implementation of the present invention, first briefly introduce the following two aspects:

[0031] 1. The principle of zero trap widening

[0032] The principle of null widening was first proposed by Mailloux. It is a method to tap the covariance matrix based on the construction of the taper matrix, as shown below:

[0033] R MZ =R⊙T MZ 1)

[0034] Among them, R is the interference plus noise covariance matrix, ⊙ represents the Hadamard product, and the taper matrix T MZ The specific expression is:

[0035] [ T MZ ] mn = sin ( ( m - n ) Δ ) ( m - n ) Δ = sin c ( ( m - n ) Δ / π ) - - - 2 )

[0036] Where [T MZ ] mn Representation matrix T MZ Element in the mth row and nth column, Δ is the null width parameter, Δ=πdW / λ, λ is the radar operating wavelength, d is the element spacing, W is the directional sine domain null wid...

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Abstract

The invention discloses a wavebeam domain adaptive interference suppression method based on null trough widening, and aims to solve the problem that motion and time change interferences cannot be offset in the conventional adaptive interference suppression method. The wavebeam domain adaptive interference suppression method comprises the following steps of: (1) acquiring data of a sample unit and a unit to be detected; (2) estimating the number of interference sources and an arrival direction; (3) determining a null trough widening parameter according to interferences and a motion range of a radar platform, generating correction data, and correcting the data of the sample unit; (4) estimating the number of required auxiliary wavebeams, and constructing an auxiliary wavebeam matrix; (5) performing wavebeam synthesis on the data of the sample unit and the data of the unit to be detected respectively; (6) calculating an adaptive weight value; and (7) performing adaptive interference suppression on main wavebeam synthesized data of the unit to be detected by using the adaptive weight value. The wavebeam domain adaptive interference suppression method has the advantages that: the motion and time change interferences can be suppressed; and the interference suppression performance is stable. The method can be used in radar signal detection.

Description

Technical field [0001] The invention belongs to the technical field of data processing, and relates to array signal processing, in particular to a beam-domain adaptive interference suppression method based on nulling widening, which is used to effectively suppress interference when a radar platform is moving and interference is time-varying. . Background technique [0002] In the working process of radar, it is inevitably affected by various external interferences. In order to ensure the normal operation of the radar system, appropriate methods must be taken to suppress these external interferences. Modern radar systems mostly adopt a phased array system, which has more degrees of freedom in the airspace. Therefore, it is a common technical means to adopt the method of airspace adaptive filtering to suppress external interference from a specific direction. Spatial adaptive filtering, that is, the core of adaptive beamforming is to align the interference direction in the synthet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36
Inventor 苏洪涛刘宏伟高超
Owner XIDIAN UNIV