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Method for recovering LFM signal under short-time strong interference

A recovery method and strong interference technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as inability to recover LFM signals, and achieve the effect of solving frequency ambiguity and few sampling points

Inactive Publication Date: 2019-08-16
HARBIN INST OF TECH
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Problems solved by technology

[0003] In order to solve the problem of LFM signal recovery that cannot be achieved by traditional algorithms in short-term strong interference environments, the present invention provides a recovery method for LFM signals under short-term strong interference

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  • Method for recovering LFM signal under short-time strong interference
  • Method for recovering LFM signal under short-time strong interference
  • Method for recovering LFM signal under short-time strong interference

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Embodiment Construction

[0020] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited to this. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the present invention. In the scope of protection.

[0021] A method for recovering LFM signals under short-term strong interference, the method includes the following steps:

[0022] Step 1: Design a reference threshold according to the signal amplitude, use the received signal to estimate the power range of the signal, perform threshold detection on the received signal, and identify the start and end time of the impact interference.

[0023] Step 2. Identify the start and end time information of the impact interference through step 1, avoid the interference time, extract the row vector of the unit matrix, and use t...

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Abstract

The invention discloses a method for recovering an LFM signal under short-time strong interference. The method comprises the following steps: I, designing a reference threshold according to a signal amplitude, detecting the threshold of a received signal, and recognizing the starting and stopping time of the strong interference; II, extracting a random unit array column vector by avoiding an interference moment, and finishing compressed sampling while filtering interference from the LFM signal with short-time strong interference by using the designed matrix; III, processing the processed dataaccording to a sparse component norm maximum value method reconstructed by compressed sensing to obtain a FrFT optimal transformation order p; IV, performing p-order FrFT calculation on the column vector of a unit array to obtain a sparse vector base; and V, reconstructing the signal by using a compressed sensing sparse recovery algorithm based on the sparse vector base to obtain a signal frequency modulation rate and starting frequency. The method can be used for recovering a linear frequency modulation signal for a condition background with short-time strong interference.

Description

Technical field [0001] The invention belongs to the field of radar signal processing and relates to a method for recovering LFM signals under short-term strong interference. Background technique [0002] Linear Frequency Modulation (LFM) signals are widely used in radar sonar and communication systems. The estimation of LFM signal parameters is an important issue in the field of electronic warfare signal processing. Under the traditional Nyquist sampling framework, domestic and foreign scholars have proposed many The methods of LFM signal parameter estimation include methods based on maximum likelihood, short-term Fourier transform and wavelet transform, Wigner-Ville distribution, Radon-Wigner transform, Ran-don-Ambiguity distribution, and fractional Fourier transform. There is a problem with the above methods. Under the Nyquist sampling framework, as the bandwidth of the LFM signal continues to increase, the sampling frequency of the signal is getting higher and higher. This is ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52G01S7/537
CPCG01S7/52G01S7/537
Inventor 宋晓健杨强张鑫赵梦晓李佳明
Owner HARBIN INST OF TECH
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