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Ionized layer clutter suppression method based on blind source separation and time frequency ridgelet domain filter

A blind source separation and clutter suppression technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as poor clutter suppression effect, achieve good clutter suppression effect, improve signal-to-noise ratio, and good clutter suppression effect of effect

Active Publication Date: 2018-12-21
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides an ionospheric clutter suppression method based on blind source separation and time-frequency ridge wave domain filtering in order to solve the problem that the existing ionospheric clutter suppression technology has a low signal-to-noise ratio and poor clutter suppression effect

Method used

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  • Ionized layer clutter suppression method based on blind source separation and time frequency ridgelet domain filter
  • Ionized layer clutter suppression method based on blind source separation and time frequency ridgelet domain filter
  • Ionized layer clutter suppression method based on blind source separation and time frequency ridgelet domain filter

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specific Embodiment approach 1

[0021] Specific implementation mode one: The ionospheric clutter suppression method based on blind source separation and time-frequency ridge domain filtering provided in this implementation mode specifically includes the following steps:

[0022] Step 1, performing source signal separation on the signal received by the radar array antenna through the blind source separation method, and arranging the separated components according to the signal-to-noise ratio from small to large;

[0023] Step 2: Perform beamforming on the signal received by the radar array antenna and the separated components after reordering in the direction of the clutter and the target beam, cancel the beamforming results of the separated components one by one with the beamforming results of the received signal, and select the clutter The cancellation result with the largest noise ratio;

[0024] Step 3: Perform time-frequency-ridge wave domain filtering processing on the canceled result, further improve t...

specific Embodiment approach 2

[0026] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that step 1 specifically includes the following steps:

[0027] Step 11. Note that the slow time signal of a certain distance unit received by the radar array antenna with the number of array elements N is X, and the slow time signal of a certain distance unit received by the nth array element for x n , x n ∈ C 1×P , n=1,...,N,C 1×P Represents a real complex number with a dimension of 1×P, where P represents the signal x n The length of , that is, the number of slow-time signal sampling points; then X∈C N×P , C N×P Represents a real complex number whose dimension is N×P; (·) T is the matrix transposition operator; the mth source signal is denoted as s m ,s m ∈ C 1×P , then the set of source signals is S∈C M×P , m=1,...,M, M is the number of source signals, each source signal is independent of each other and comes from different directions, s m from theta m directio...

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the specific process of calculating the signal-to-noise ratio described in step one or two includes:

[0035] Since the speed of the target does not change much within a certain period of time (especially the speed of the ship target and similar ships is slow, and the change within a fixed time is smaller), so when the target enters the ionospheric clutter area, resulting in the loss of the target, You only need to find the target near the Doppler unit when the target is not lost; for the nth separated component y n Perform Fourier transform to obtain the corresponding Doppler spectrum. The Doppler unit when the target is not lost is recorded as i, and the i-th Doppler unit and the area that is less than E Doppler units away from i are used as the target search area, find the maximum value y of the Doppler unit in the target search area [i-E,i+E] n,target , take...

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Abstract

The invention provides an ionized layer clutter suppression method based on blind source separation and time frequency ridgelet domain filter, and belongs to the technical field of the radar signal treatment. The method comprises the following steps: firstly performing source signal separation on a signal received by a radar array antenna through a blind source separation method, and arranging separation components according to signal-to-clutter-to-noise ratios (SCNR) from small to big; and then performing the beamforming on the signal received by the radar array antenna and the rearranged separation components at the beam direction located by the clutter ad the target, and cancelling the separation component beamforming results one-by-one by using the receiving signal beamforming result,and selecting a cancellation result with the maximum SCNR; and performing the time-frequency-ridgelet domain filter processing on the cancelled result, thereby further improving the SCNR of the signal. The problem that the clutter suppression effect is bad when the SCNR is relatively low in the existing ionized layer clutter suppression technology is solved, and the clutter suppression performanceis better in comparison with the prior art. The method can be used for the strong clutter problem oriented to the beyond visual range detection of a high-frequency radar.

Description

technical field [0001] The invention relates to a method for suppressing ionospheric clutter and belongs to the technical field of radar signal processing. Background technique [0002] High frequency over-the-horizon radar HF-OTHR (High Frequency Over the Horizon Radar) was proposed and used in practice in the 1960s. It broke through the limitation of "line-of-sight" detection and filled the detection blind area of ​​microwave line-of-sight radar. Radar constitutes a complete detection system. When the high-frequency radar conducts over-the-horizon detection, the strong ionospheric clutter will enter the radar receiver together with the target echo signal, and the ionospheric clutter broadening on the Doppler spectrum will submerge the target echo signal, seriously affecting the radar detection performance even makes it impossible to work, especially for ships and similar targets that are slower (i.e. in the small Doppler frequency region), have a low signal-to-noise ratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 位寅生宿愿张洋于雷
Owner HARBIN INST OF TECH
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