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External radiation source radar wind field clutter suppression method based on morphological component analysis

A technology for external radiation source radar and clutter suppression, which is applied in the field of external radiation source radar signal processing, can solve the problems of wind field clutter suppression that cannot have non-zero frequency components, and achieves improved detection performance, simple calculation, and good stability. Effect

Active Publication Date: 2015-11-04
WUHAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

External radiation source radar is a new type of radar. At present, the research on external radiation source radar at home and abroad mainly focuses on target detection, positioning and tracking, while there is less research on wind field clutter. In addition, various existing external radiation sources Radar time-domain and air-domain clutter suppression algorithms can only suppress static clutter, but cannot effectively suppress non-zero frequency components of wind field clutter

Method used

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  • External radiation source radar wind field clutter suppression method based on morphological component analysis
  • External radiation source radar wind field clutter suppression method based on morphological component analysis
  • External radiation source radar wind field clutter suppression method based on morphological component analysis

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Embodiment 1

[0056] figure 2 It is a location layout diagram of the experimental receiving and transmitting stations based on the multi-frequency network signal in the embodiment of the present invention. Wuhan Transmitting Station is located in Guishan TV Tower, the distance between the receiving and transmitting stations is 7.9km, the center frequency of the transmitting signal is 754MHz, the bandwidth is 8MHz, and the transmitting power is 3kW.

[0057] In order to facilitate performance analysis, the signal-to-clutter ratio is -45dB injected at the third distance element (corresponding to bistatic distance is 79.37m) and the 20th Doppler element (corresponding to bistatic Doppler is 39.84Hz) of the measured data The moving target signal ensures that the injection target is located in the clutter area generated by the fan blades.

[0058] Figure 3-1 to Figure 3-4 is the processing result of a set of collected data, where, Figure 3-1 is the range Doppler spectrum before multipath c...

Embodiment 2

[0060] Figure 4 It is a location layout diagram of the experimental receiving and transmitting stations based on the multi-frequency network signal in the embodiment of the present invention. The signal center frequency of Wuhan SFN is 658MHz, the signal bandwidth is 8MHz, vertical polarization is adopted, and the transmission power is 1kW. In order to facilitate performance analysis, a signal-to-clutter ratio of -60dB is injected into the 26th range element (corresponding to bistatic distance is 750m) and the 20th Doppler element (corresponding to bistatic Doppler is 39.35Hz) of the measured data. Moving the target signal to ensure that the injection target is located in the clutter area generated by the fan blades.

[0061] Figure 5-1 to Figure 5-4 is the processing result of one set of typical data, where, Figure 5-1 is the range Doppler spectrum before multipath clutter suppression, and its typical feature is that there is strong multipath clutter at zero Doppler, an...

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Abstract

The invention discloses an external radiation source radar wind field clutter suppression method based on morphological component analysis. A situation that a target signal and wind field clutter in the echo received by radar have different morphological characteristics is utilized, and sparse representation can be performed in corresponding transform domains so that signal separation can be performed by utilizing the morphological component analysis method. Wind field clutter can be greatly suppressed by the method. Meanwhile, the method has advantages of being great in stability and easy and convenient in calculation so that external radiation source radar target detection performance can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of external radiation source radar signal processing, in particular to a clutter suppression method for external radiation source radar wind field based on morphological component analysis. Background technique [0002] External radiation source radar (also known as passive radar) is a bistatic / multistatic radar system that uses electromagnetic signals emitted by a third party for target detection. The radar itself does not directly radiate electromagnetic energy, but receives external The direct wave of the cooperative radiation and the reflected wave or scattered wave formed after irradiating the target completes the detection, positioning and tracking of the target. Since the available external radiation sources (including radio stations, television stations and mobile communication base stations, etc.) have the characteristics of wide airspace and time domain coverage and high base station configuration ...

Claims

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 万显荣夏鹏易建新
Owner WUHAN UNIV
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