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Riemann distance-based generalized sidelobe cancellation algorithm

A technology of sidelobe cancellation and distance, applied in the field of airspace adaptive processing algorithm, to achieve the effects of adaptively changing weights, improving signal-to-clutter ratio, and simple and convenient implementation

Active Publication Date: 2020-01-03
杨强 +1
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is in order to solve the non-stationary clutter suppression problem under the background of mixed propagation mode high-frequency over-the-horizon radar, the present invention provides a kind of based on Riemann distance Generalized Sidelobe Cancellation Algorithm

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  • Riemann distance-based generalized sidelobe cancellation algorithm

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specific Embodiment approach 1

[0038] combine figure 1 Describe this embodiment, the generalized sidelobe cancellation algorithm based on Riemann distance described in this embodiment includes the following steps:

[0039] Step 1: Perform range processing and Doppler processing on all channel echo signals of the mixed propagation mode high-frequency over-the-horizon radar to obtain a distance-velocity-channel three-dimensional data block;

[0040] Step 2: Perform digital beamforming processing on each channel data block to form a main beam data block, and perform single notch filter auxiliary beamforming processing on each channel data block at a specified angle unit to form an auxiliary beam data block;

[0041] Step 3: Select the size of the training sample selection unit, select the main beam data of several range units of the specified Doppler unit and angle unit, form the training sample selection data block, and calculate the covariance of the local area unit to be processed corresponding to each rang...

Embodiment 1

[0046] A generalized sidelobe cancellation algorithm based on Riemann distance, comprising the following steps:

[0047] Step 1: Suppose that the echo signal of the mixed propagation mode high-frequency over-the-horizon radar is processed by distance, and the distance dimension of the data is 200; after Doppler processing, the velocity dimension of the data is 309; the number of receiving channels of the actual system is 16, and the obtained The distance-velocity-channel three-dimensional data block is {dataCh}, and its dimension is 200×309×16;

[0048] Step 2: Perform digital beamforming processing on {dataCh}, the angle dimension of the data is 31, and obtain the distance-velocity-angle three-dimensional main beam data block as {dataDBF}, whose dimension is 200×309×31, and draw the 13th angle unit The distance-velocity graph of figure 2 shown.

[0049] For {dataCh} in the specified angle unit 13, perform single-notch filter auxiliary beamforming processing, divide the 16-...

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Abstract

The invention relates to a Riemann distance-based generalized sidelobe cancellation algorithm, and relates to a sea clutter suppression method for high-frequency beyond visual range radar in a hybridpropagation mode. In order to solve the problem of suppression of a non-stable sea clutter received by the high-frequency beyond visual range radar under the hybrid propagation mode, the invention provides the Riemann distance-based generalized sidelobe cancellation algorithm. On the basis of a traditional generalized sidelobe cancellation processing method, an effective training sample is selected according to Riemann distance between training sample covariance matrixes, and non-stable cluster suppression is performed. The Riemann distance-based generalized sidelobe cancellation algorithm isused for suppressing sea cluster and other non-stable cluster by the high-frequency beyond visual range radar under the hybrid propagation mode, so that the signal-to-noise ratio is improved, and thetarget detection probability is improved.

Description

technical field [0001] The invention relates to an airspace adaptive processing algorithm for suppressing high-frequency over-the-horizon radar clutter, and belongs to the field of hybrid propagation mode high-frequency over-the-horizon radar clutter suppression. Background technique [0002] Mixed propagation mode high-frequency over-the-horizon radar is a new high-frequency radar system. Based on the traditional single-station high-frequency ground-wave over-the-horizon radar, it enriches the electromagnetic wave propagation path and combines two propagation modes of ground wave sea surface propagation and sky wave propagation along the ionosphere. The transmitted signal includes both the ground wave mode propagating along the surface and the sky wave mode reflected by the ionosphere. After the electromagnetic wave hits the target, the echo signal passes through the ground wave mode, is received along the surface, and is reflected into the ionosphere. Skywave mode is rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/28G01S7/35G01S7/03
CPCG01S7/2813G01S7/35G01S7/03
Inventor 杨强张佳智杨勇张鑫张薇赵梦晓李佳明
Owner 杨强
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