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Method of designing anti-Doppler lower pair petal waveform

A design method and low sidelobe technology, applied in electrical components, synchronization devices, wireless communications, etc., can solve the problems of autocorrelation signal submersion, inapplicability, and can only reach -33dB, etc., achieve low sidelobe characteristics, improve self- Effects of Correlation Properties

Inactive Publication Date: 2008-04-09
CENT ACADEME OF SVA GROUP
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Problems solved by technology

[0003] The chirp signal has good anti-Doppler effect, and it still has good autocorrelation characteristics at the Doppler frequency up to several thousand Hz (one of the measures of the Doppler effect), but due to the The spectral component is linear, so the first sidelobe of its autocorrelation waveform can only reach -33dB, as shown in Figure 1, such a high sidelobe is obviously not suitable for high-noise environments, because the autocorrelation signal is easily overwhelmed in the background of noise

Method used

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  • Method of designing anti-Doppler lower pair petal waveform
  • Method of designing anti-Doppler lower pair petal waveform
  • Method of designing anti-Doppler lower pair petal waveform

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Embodiment Construction

[0033] The design method of the anti-Doppler low sidelobe waveform of the present invention will be further described in detail below.

[0034] Fig. 3 shows the flow process of a kind of design method of anti-Doppler low sidelobe waveform of the present invention, according to this flow process, the specific steps of this embodiment are as follows:

[0035] Step S1: Initialize i=0; generate a random signal A with Gaussian distribution i (τ)(τ>=0), take the interference signal r i (τ)=A i (τ)(τ>=0), r i (τ)=-A i (-τ)(τ<0), where i=0, 1, 2, ...;

[0036] Step S2: The interference signal r i (τ) is arithmetically added to the frequency (β*τ) of the chirp signal to obtain an improved spectral component F i (τ);

[0037] Step S3: Calculate the time-domain waveform S of the improved chirp according to the following formula i (t), i=0, 1, 2, ...

[0038] S i ( t ) = ...

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Abstract

The invention provides a design method for anti-Doppler lower side lobe waveform. The design method for the waveform superimposes an interference signal r(Tau) on the spectrum component Beta Tau of the linear FM signal, thus obtaining a waveform with the characteristic of anti-Doppler lower side lobe. The method can further reduce the side lobes of the self-related waveform of the lineary FM signal without changing the anti-Doppler characteristic of the linear FM signal, so that the self-related characteristics of the linear FM signal is enhanced.

Description

technical field [0001] The invention relates to a digital signal processing method, in particular to a design method of a side lobe waveform which is insensitive to Doppler effect and has very low autocorrelation. Background technique [0002] With the development of mobile communication technology, the Doppler effect becomes more and more obvious, especially in the communication in high-speed motion, so it is easy to design a waveform with good anti-Doppler effect in communication. very important. At the same time, because digital communication needs to perform various synchronizations, including the synchronization of channel signals, etc., and the synchronization technology requires that the synchronization waveform has good autocorrelation characteristics; therefore, it is necessary to design a The waveform of the relevant characteristics has a strong application value. [0003] The chirp signal has good anti-Doppler effect, and it still has good autocorrelation charac...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B1/10H04W56/00
Inventor 刘才勇
Owner CENT ACADEME OF SVA GROUP
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