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Time-varying narrow-band interference suppression method based on complex empirical mode decomposition

An empirical mode decomposition and narrow-band interference technology, applied in the field of signal processing, can solve problems such as difficult to estimate narrow-band interference frequency and slow convergence speed, and achieve the effect of retaining nonlinear and non-stationary characteristics, fast convergence speed and high efficiency

Inactive Publication Date: 2012-06-27
XIDIAN UNIV
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Problems solved by technology

However, the disadvantage of this method is that the LMS adaptive algorithm is used when adjusting the parameters of the notch filter, and its convergence speed is slow, and it is difficult to estimate the frequency of narrow-band interference

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  • Time-varying narrow-band interference suppression method based on complex empirical mode decomposition
  • Time-varying narrow-band interference suppression method based on complex empirical mode decomposition
  • Time-varying narrow-band interference suppression method based on complex empirical mode decomposition

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Embodiment Construction

[0045] Attached below figure 1 The steps of the present invention are further described in detail.

[0046] Step 1: Acquire SAR echoes

[0047] The radar transmits and receives pulses at a certain pulse repetition frequency, and obtains the SAR echo with the distance as the row vector and the azimuth as the column vector, and performs Fourier transform on each range unit according to the following formula to obtain the range domain signal:

[0048] S ( k ) = Σ K = 0 N - 1 s ( n ) exp ( - j 2 π N kn )

[0049] Among them,...

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Abstract

The invention discloses a time-varying narrow-band interference suppression method based on complex empirical mode decomposition, which includes the following steps, (1), obtaining SAR return wave; (2), judging that whether time-varying narrow-band interference exists; (3), performing the complex empirical mode decomposition; (4), obtaining the range pulse pressure and performing the range walk correction, (5), performing parameter estimation; (6), performing motion compensation; (7), obtaining the orientation pulse pressure; and (8), performing multi-look processing. The narrow-band interference suppression method provided by the invention is suitable for range and orientation two-dimensional time-varying NBI, makes full use of the complex empirical mode decomposition method, sets the threshold suppression strong interference component, has better strong interference suppression ability, retains signals to the utmost extent, and has clearer SAR imaging.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and further relates to a time-varying narrow-band interference suppression method based on complex empirical mode decomposition in the field of radar signal processing. The invention can be used to suppress narrow-band interference in radar echo signals, reduce loss of useful signals, and realize clear SAR imaging. Background technique [0002] Narrowband jamming is a common form of jamming in Synthetic Aperture Radar (SAR) systems. It mainly includes radio frequency interference, self-excited interference and artificial release interference. The radio frequency interference mainly refers to the interference of SAR radar (especially low-band SAR radar) by non-coherent electromagnetic signals of other radiation equipment such as TV network and communication network in the same band. The existence of these interferences reduces the signal-to-noise ratio of SAR images. In the case of hig...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G01S13/90
Inventor 周峰白雪茹石晓然孙光才保铮
Owner XIDIAN UNIV
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