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Clutter suppression method based on subspace projection

A technology of subspace projection and clutter suppression, which is applied in radio wave measurement system, radio wave reflection/reradiation, utilization of reradiation, etc., can solve problems such as time-consuming, performance degradation, etc., to avoid processing and reduce clutter The effect of inhibiting performance

Pending Publication Date: 2020-11-20
XIDIAN UNIV
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Problems solved by technology

[0004] Since the along-track interferometry method is performed in the image domain, ghosting will appear in the imaging results of low PRF data, so its application also requires preprocessing, and these two sets of processes can be very time-consuming when the amount of data is large
The STAP method can be directly applied to the HRWS-SAR system and has good performance, but when the moving target signal involves the calculation of the clutter covariance matrix, its performance will decrease

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  • Clutter suppression method based on subspace projection
  • Clutter suppression method based on subspace projection
  • Clutter suppression method based on subspace projection

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Embodiment 2

[0078] On the basis of the first embodiment, this embodiment describes in detail the clutter suppression method based on subspace projection. See figure 2 , figure 2 It is a detailed flowchart of a method for suppressing clutter based on subspace projection provided by an embodiment of the present invention.

[0079] The method of this embodiment includes:

[0080] Step 1: Obtain multi-channel echo signals;

[0081] Specifically, the echo signals of M channels are obtained, and the echo signals X of these M channels are expressed as:

[0082] X=S c +St +N

[0083] Among them, S c Indicates the clutter signal, S c =[S c,1 (t r ,t a )S c,2 (t r ,t a )…S c,m (t r ,t a )…S c,M (t r ,t a )] T , M is the number of channels, (·) T Represents the transpose operation on the matrix, S c,m (t r ,t a ) for the mth channel at t a The clutter signal received at any time, m=1, 2, 3,..., M-1, M, S c,m (t r ,t a ) can be expressed as:

[0084]

[0085] Among t...

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Abstract

The invention discloses a clutter suppression method based on subspace projection. The clutter suppression method comprises the following steps of acquiring multichannel original echo signals, performing azimuth FFT processing on the echo signal to obtain an echo signal of a Doppler domain, obtaining a clutter subspace projection matrix of a Doppler unit, projecting the echo signal of the currentDoppler unit to the clutter subspace to obtain a projection result, traversing all the Doppler units to obtain complete projection results of all the Doppler units, subtracting the echo signal of theDoppler domain from the complete projection result to obtain a difference value, and carrying out azimuth IFFT processing on the difference value to obtain a clutter suppressed signal. The method canbe directly applied to azimuth undersampling data received by a high-resolution wide-swath multi-channel SAR system, the tedious processing process is avoided, and the clutter suppression performanceis better.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a clutter suppression method based on subspace projection. Background technique [0002] Clutter suppression is the primary link of moving target detection in multi-channel SAR (Synthetic Aperture Radar, synthetic aperture radar) system. Traditional clutter suppression methods, such as DPCA (Displaced Phase Center Antenna, phase center offset antenna) method, ATI ( Along Track Interferometry, STAP (Space-Time Adaptive Processing, space-time adaptive processing) method, mainly in the case of PRF (pulserepetition frequency, pulse repetition frequency) not less than Nyquist frequency Research. However, in the high-resolution wide swath SAR system (HRWS-SAR system for short), the azimuth channel sampling lower than the PRF is used to break through the minimum antenna area constraint. Usually, the Doppler bandwidth of the received signal is several times ...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S13/90G01S7/02G01S7/36
CPCG01S7/414G01S7/415G01S7/418G01S13/9094G01S13/9023G01S7/023G01S7/36
Inventor 孙光才王敬旺李铂宇杨军邢孟道
Owner XIDIAN UNIV
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