Separation method and device for time-frequency overlapping multi-component chirp signal

A linear frequency modulation signal and time-frequency technology, applied in the field of signal processing, can solve problems such as huge amount of calculation and difficult application, and achieve the effect of wide applicability, great flexibility, and reduction of calculation amount

Active Publication Date: 2021-01-22
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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Problems solved by technology

However, compared with the Wigner-Ville distribution, SPWVD requires windowing functions for smoothing in both the time domain and the frequency domain, and its huge amount of computation makes it difficult to apply in practice.

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  • Separation method and device for time-frequency overlapping multi-component chirp signal
  • Separation method and device for time-frequency overlapping multi-component chirp signal
  • Separation method and device for time-frequency overlapping multi-component chirp signal

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] A chirp signal will behave as an impulse function in the appropriate fractional Fourier domain, that is, the fractional Fourier transform in a certain order of the fractional Fourier domain has a good Energy-gathering properties, the energy of other order fractional Fourier domain chirp signals will be broadened. This energy aggregation characteristic is the theoretical basis of fractional Fourier transform for linear frequency modulation signal detection and parameter estimation. The energy of the noise is evenly distributed in the entire time-frequency plane, and no obvious energy accumulation will appear in any fractional Fourier domain.

[0040] like figure 1As shown, the separation method of the time-frequency overlapping multi-component chirp signal includes: Step S101: the input time-frequency overlapping multi-component chirp signal (N input chirp sign...

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Abstract

The invention relates to the technical field of signal processing, and discloses a method for separating time-frequency overlapping multi-component linear frequency modulation signals. Including: Dividing the input time-frequency overlapping multi-component linear frequency modulation signal into two processing channels (A and B) in the digital domain, channel B stores the input digital signal, and channel A performs fractional order Fu on the input digital signal Liye transform, estimate the number N of chirp signals and measure the parameters of the chirp signals respectively; then configure the computing resources and filtering resources in channel B; then construct N processing branches in channel B; finally in channel B each In the processing branch, the fractional Fourier transform of the optimal order is performed on the input time-frequency overlapping multi-component linear frequency modulation signal, band-pass filtering is performed, and the fractional-order inverse Fourier transform of the optimal order is performed to obtain the separated Signal component. At the same time, the corresponding device is disclosed. The foregoing solution reduces the computation load of the processing process and improves the frequency domain resolution.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method and a device for separating time-frequency overlapping multi-component linear frequency modulation signals. Background technique [0002] With the increasingly widespread application of radio technology in military and civilian fields, wireless receiving systems are faced with increasingly dense electromagnetic signal environments. Linear frequency modulated signal (LFM: linear frequency modulated signal), as a commonly used signal form, has been widely used in many fields such as radar, communication, sonar and electronic warfare. It may be received in a single receiving channel of a wireless receiving system Multiple chirp signals overlapping in time and frequency: In radar and sonar systems, the received signal may be the echo of multiple chirp signals with different propagation delays and attenuations; in speech signal processing systems, a certain In some...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/288G01S7/35
CPCG01S7/288G01S7/352G01S7/2883G01S7/356
Inventor 周涛王茂汶钟欣刘静娴陈智宇
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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