Micro-Doppler time-space-frequency three-dimensional analysis method based on SAR-DPCA (Synthetic Aperture Radar-Data Processing Control Area)

An analysis method, three-dimensional technology, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., can solve problems such as the inability to describe the characteristics of micro-Doppler signals

Active Publication Date: 2015-07-22
江苏盐综产业投资发展有限公司
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Problems solved by technology

But whether it is a linear time-frequency representation or a quadratic time-frequency representation, they can only analyze the changes in the two dimensions of time-frequency, but in some scenarios, such as when two moving targets are in the same distance dimension, they cannot Using Time-Frequency Analysis to Describe Micro-Doppler Signal Characteristics

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  • Micro-Doppler time-space-frequency three-dimensional analysis method based on SAR-DPCA (Synthetic Aperture Radar-Data Processing Control Area)
  • Micro-Doppler time-space-frequency three-dimensional analysis method based on SAR-DPCA (Synthetic Aperture Radar-Data Processing Control Area)
  • Micro-Doppler time-space-frequency three-dimensional analysis method based on SAR-DPCA (Synthetic Aperture Radar-Data Processing Control Area)

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[0026] To illustrate the effect. Time-frequency analysis and time-space-frequency three-dimensional analysis experiments were carried out on the same moving target point under the same radar parameters. The SAR dual-channel radar echo data comes from computer simulation modeling, and the background clutter is Gaussian white noise. The parameters of the radar and the carrier aircraft are shown in Table 1.

[0027] like figure 1 As shown, first, the SAR radar simulation program is used to generate the original echo data of the SAR dual channel, and the main parameters are shown in Table 1. Set the position coordinates of the two moving targets as [50,0] and [50,50] respectively. ([x,y]x represents the distance coordinate, y represents the azimuth coordinate), and the tangential velocity of the moving target is 5m / s, and the radial velocity is 5m / s. Then coherent detection and range compression are performed on the two-channel data. The processed SAR dual-channel baseband sig...

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Abstract

The invention provides a micro-Doppler time-space-frequency three-dimensional analysis method based on an SAR-DPCA (Synthetic Aperture Radar-Data Processing Control Area). The problem in the prior art is that final motion characteristics of a plurality of movable targets are mutually interfered based on an SAR-DPCA time-frequency analytical algorithm. According to the method, a double-channel DPCA is used for inhibiting static noise waves, and double-channel fused data is subjected to distance-pulse compression; then a corresponding data slice is extracted. A distance related amount is extracted from the obtained data slice to be used as a third dimensionality, so that the time-space-frequency three-dimensional analysis is carried out on the SAR micro-Doppler characteristics. The method provided by the invention is applicable to the SAR micro-Doppler characteristic time-frequency analysis, and the mutual interference of micro-Doppler signals between a plurality of targets under the plurality of movable targets can be avoided, so that the micro-Doppler analysis level is improved.

Description

technical field [0001] The invention belongs to a method for time-space-frequency three-dimensional analysis based on SAR-DPCA micro-Doppler, belongs to the field of SAR radar micro-Doppler data processing method and application technology, and is applicable to SAR radar micro-Doppler data analysis Theoretical methods and applied technical research. Background technique [0002] DPCA, that is, offset phase center antenna technology, is a typical method for the research and development of multi-channel SAR radar to suppress clutter. It compensates the movement of the radar platform by offsetting the aperture of the array antenna relative to the direction of flight between two pulses. The classic DPCA method uses two phase centers, and performs clutter suppression on the basis of satisfying a certain relationship between the phase center distance, pulse repetition frequency and platform velocity. It is because of the advantages of this method that it is easy to use in engine...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S13/904G01S13/9029
Inventor 陈华杰耿志高郭宝峰林萍
Owner 江苏盐综产业投资发展有限公司
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