Wavebeam domain adaptive interference suppression method based on null trough widening

A zero-notch widening and interference suppression technology, applied in the field of data processing, can solve problems such as the inability to apply part of the adaptive array processing structure, and achieve economical and reasonable interference suppression, overcoming the number of auxiliary beams, and the effects of moving and time-varying interference suppression.

Active Publication Date: 2012-06-20
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 content of the following two aspects:

[0031] 1. The principle of zero notch widening

[0032] The principle of zero trap widening was first proposed by Mailloux, which is a method of tapering the covariance matrix based on the construction of a tapered matrix, as shown below:

[0033] R MZ =R⊙T MZ 1)

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

[0035] [ T MZ ] mn = sin ( ( m - n ) Δ ) ...

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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 anda 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 null trap widening, which is used to effectively suppress interference under the condition of radar platform movement and interference time-varying . Background technique [0002] During the working process of radar, it is unavoidable to be affected by various external disturbances. In order to ensure the normal operation of the radar system, appropriate methods must be adopted to suppress these external disturbances. Modern radar systems mostly adopt the 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. Space adaptive filtering, that is, the core of adaptive beamforming is to align the direction...

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Application Information

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