Method and device for estimating frequency modulation ratio of linear frequency modulation signal

A technology of linear frequency modulation signal and frequency modulation, which is applied in the field of signal processing, can solve problems such as misjudgment of frequency modulation frequency estimation, and achieve the effects of improving applicability, accuracy, and estimation accuracy

Active Publication Date: 2016-05-04
大唐联诚信息系统技术有限公司
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Problems solved by technology

The problem existing in the existing frequency modulation frequency estimation method is that the range of the estimated frequency modulation frequency is small. When the frequency modulation frequency is large, the chirp signal may have scanned the entire bandwidth in a window; a

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  • Method and device for estimating frequency modulation ratio of linear frequency modulation signal
  • Method and device for estimating frequency modulation ratio of linear frequency modulation signal
  • Method and device for estimating frequency modulation ratio of linear frequency modulation signal

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Embodiment Construction

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0054] In the embodiment of the present invention, the idea of ​​estimating the frequency modulation frequency of the chirp signal is mainly as follows: take the currently received signal, and multiple signals received with multiple time delays away from the current one, and receive one signal corresponding to one time delay away from the current one; thus, the current The signals are respectively autocorrelated with the signals received at each time delay to o...

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Abstract

The invention provides a method and a device for estimating the frequency modulation ratio of a linear frequency modulation signal. The method comprises the following steps: presetting a time delay set; determining a received current signal; performing autocorrelation operation on the current signal and each signal which is a set time delay from the current signal to get autocorrelation functions corresponding to the set time delays respectively; performing FFT operation on the autocorrelation functions corresponding to the set time delays to get corresponding fuzzy functions; determining the over-threshold peak positions in the fuzzy functions corresponding to the set time delays to get corresponding over-threshold peak position sets; judging the linear relationship between the over-threshold peak positions in the over-threshold peak position sets corresponding to the different set time delays, determining target over-threshold peak positions satisfying the linear relationship in the different set time delays, and forming a target over-threshold peak position set; and estimating the frequency modulation ratio according to the target over-threshold peak position set. With the method and the device, estimation within a large frequency range is realized, and the accuracy of frequency modulation ratio estimation is improved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method and device for estimating the frequency modulation frequency of a linear frequency modulation signal. Background technique [0002] Linear frequency modulation signal (LFM, Linear Frequency Modulation, also known as chirp signal) is a common non-stationary signal with a large time-width bandwidth product; linear frequency modulation signal is widely used in radar, sonar, communication, jammer and other fields; Frequency modulation frequency is an important characteristic parameter of linear frequency modulation signal, and the estimation of frequency modulation frequency has always been the research content in the field of linear frequency modulation signal processing. [0003] At present, the method of estimating the frequency of chirp signals is mainly as follows: firstly, the frequency characteristics of short-term signals in multiple continuous windows are ...

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Application Information

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IPC IPC(8): G01S7/28G01S7/523
CPCG01S7/28G01S7/523
Inventor 杨远苏加加曹晏波乔元新
Owner 大唐联诚信息系统技术有限公司
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