Efficient three-dimensional space-time adaptive clutter suppression method for airborne digital array radar

A technology of digital array radar and self-adaptive clutter, which is applied in the direction of radio wave measurement system, instrument, etc., can solve the problem of insufficient clutter suppression performance of two-dimensional STAP, and achieve improved clutter suppression effect, easy engineering implementation, and improved suppression performance effect

Inactive Publication Date: 2012-10-10
HOHAI UNIV
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Problems solved by technology

The present invention aims at the defect that the traditional azimuth-pulse domain two-dimensional STAP clutter suppression performance is insufficient for the airborne non-frontal array digital array radar under the medium and high PRF system, and proposes an airborne digital array based on the pitch-azimuth-pulse three-d

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  • Efficient three-dimensional space-time adaptive clutter suppression method for airborne digital array radar
  • Efficient three-dimensional space-time adaptive clutter suppression method for airborne digital array radar
  • Efficient three-dimensional space-time adaptive clutter suppression method for airborne digital array radar

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The present invention will be further described in detail below with reference to the accompanying drawings.

The geometric relationship of the non-frontal side array of the airborne radar is shown in Figure 1. It is assumed that the antenna is a rectangular array, and the spacing between the array elements is half wavelength. It is assumed that the normal direction of the antenna plane is the x-axis, the lateral direction of the antenna plane is the y-axis, and the upward direction perpendicular to the ground is the z-axis. The angle that the flight direction of the carrier deviates from the left side of the y-axis is ; the angle between the direction of the radar main lobe beam and the horizontal axis of the array antenna is ; the pitch angle from ground clutter to the array antenna at different distances is different. The pitch angle is defined as the angle between the radar ray and the normal of the antenna front, as shown in Figure 1. The relationship between clutter Dop...

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Abstract

The invention discloses an efficient three-dimensional space-time adaptive clutter suppression method for airborne digital array radar, and belongs to the field of suppression of clutters of airborne radar. In the method, a cascading mode is adopted for the airborne non-front lateral planar array radar working in a medium and high pulse repetition frequency (PRF) system, and the method includes designing a robust adaptive digital beam former (ADBF) in a pitching dimension of airspace to suppress short-range clusters at first; and designing a two-dimensional dimension-reduction space-time adaptive processor (STAP) in a direction-pulse field to further suppress long-range clutters. By the aid of the efficient three-dimensional space-time adaptive clutter suppression method, the clutters at various fuzzy distances of the airborne non-front lateral planar array radar can be effectively filtered, the convergence speed is fast, computational complexity is low, and the method is suitable forengineering application.

Description

technical field The invention relates to an airborne digital array radar efficient three-dimensional space-time adaptive clutter suppression method, which belongs to the field of airborne radar clutter suppression. Background technique Airborne radar looks down, and ground clutter has a wide spectrum and high intensity. Effective suppression of clutter is the core means to improve detection performance. The two-dimensional space-time adaptive processing (STAP) technology based on airspace azimuth and time-domain pulse sampling is an effective method for airborne radar clutter suppression. For example, the E2-D airborne early warning radar in the United States uses this technology. As a statistical adaptive processing algorithm, STAP can give full play to its performance only when the clutter satisfies the independent and identical distribution (IID) condition [1-6]. Airborne radar generally adopts pulse Doppler (PD) system. When the radar pulse repetition frequency (PRF) ...

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Application Information

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IPC IPC(8): G01S7/36
Inventor 沈明威蒋德富静大海冯芸
Owner HOHAI UNIV
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