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A linear frequency modulation signal detection method and system based on autocorrelation coordinate axis rotation

A technology of linear frequency modulation signal and detection method, which is applied in the field of signal processing and can solve problems such as limited detection performance and loss of signal-to-noise ratio

Active Publication Date: 2021-08-24
XIDIAN UNIV
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Problems solved by technology

However, due to the loss of signal-to-noise ratio caused by this method when reconstructing the time-frequency plane, its detection performance in the case of low signal-to-noise ratio is limited

Method used

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  • A linear frequency modulation signal detection method and system based on autocorrelation coordinate axis rotation
  • A linear frequency modulation signal detection method and system based on autocorrelation coordinate axis rotation
  • A linear frequency modulation signal detection method and system based on autocorrelation coordinate axis rotation

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Embodiment Construction

[0047] The present invention will be described in further detail below in conjunction with specific examples, but the embodiments of the present invention are not limited thereto.

[0048] See figure 1 , figure 1 It is a flow chart of a chirp signal detection method based on autocorrelation axis rotation provided by an embodiment of the present invention, and obtains a chirp signal to be detected;

[0049]performing digital sampling and preprocessing on the chirp signal to be detected to obtain first signal data;

[0050] performing autocorrelation processing on the first signal data to obtain second signal data;

[0051] performing fast Fourier transform and translation operations on the second signal data to obtain third signal data;

[0052] Obtaining an optimal rotation angle according to the chirp signal to be detected;

[0053] performing coordinate axis rotation on the third signal data according to the optimal rotation angle to obtain fourth signal data;

[0054] ...

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Abstract

The invention belongs to the field of signal processing, and specifically relates to a chirp signal detection method and system based on autocorrelation coordinate axis rotation, which acquires a chirp signal to be detected; obtains first signal data according to the chirp signal to be detected; and obtains first signal data according to the first signal data Obtain the second signal data; obtain the third signal data according to the second signal data; obtain the optimal rotation angle according to the chirp signal to be detected; obtain the fourth signal data according to the optimal rotation angle; obtain the compensated fourth signal according to the fourth signal data data; obtain the fifth signal data according to the compensated fourth signal data; obtain the peak coordinates of the fifth signal data according to the fifth signal data; obtain the estimated value of the modulation frequency and the estimated value of the center frequency according to the chirp signal to be detected. The invention can effectively realize the detection and parameter estimation of multi-component linear frequency modulation signals under the condition of low signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the field of signal processing, and in particular relates to a linear frequency modulation signal detection method and system based on autocorrelation coordinate axis rotation. Background technique [0002] Because of its excellent characteristics, chirp signal is widely used in engineering fields such as radar, sonar and communication. In recent years, the chirp signal has become a research hotspot, and scholars from various countries have successively proposed many algorithms to solve the detection and parameter estimation problems of the chirp signal. These algorithms can be roughly divided into the following two categories: search algorithms and non-search algorithms; typical search algorithms include: fractional Fourier transform, Radon-Wigner transform, and Radon fuzzy transform; Realize accumulation in their respective domains, and then realize signal detection and parameter estimation; fractional Fourier transform is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G01S7/292G06F17/14G06F17/16
CPCG01S7/292G01S7/418G06F17/142G06F17/16
Inventor 陶海红赵朗旭陈维佳曾操时亮任月
Owner XIDIAN UNIV
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