A Parameter Estimation Method of LFM Signal Based on Power Spectrum

A chirp signal and power spectrum technology, applied in the measurement of electric power, pulse characteristic measurement, electric vehicles, etc., can solve the problems of large amount of calculation and noise, and achieve the effect of overcoming the large amount of calculation.
CN103063909BInactive Publication Date: 2015-10-28TIANJIN UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN UNIVERSITY OF TECHNOLOGY
Publication Date
2015-10-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a linear frequency modulation signal parameter valuation method based on power spectrum. The method comprises that value-to-be-estimated linear frequency modulation signal power spectrum P (x) is detected; a shape feature CO (P (x)) of the linear frequency modulation signal power spectrum P (x) is extracted; a slope beta of a rising edge of the shape feature CO (P (x)) is calculated, and a frequency modulation slope k of the linear frequency modulation signal is calculated according to the relation between the frequency modulation slope k and the slope beta of the rising edge; a frequency difference delta f is calculated according to the relation between the frequency difference delta f of a peak frequency f1 and a starting frequency fs of the rising edge of the shape feature and the frequency modulation slope k; the starting frequency fs and an end frequency fe of the linear frequency modulation signal are calculated, and bandwidth B is calculated; and pulse width Tau is calculated according to the relation between the pulse width Tauand the bandwidth B. The defects in the prior art that influence of noise on linear frequency modulation signal value estimating result in a low signal noise ratio environment is large and calculation amount is large are overcome, and therefore value estimation of the linear frequency modulation signal parameter is achieved in unknown prior information conditions.
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Description

technical field

[0001] The invention relates to a linear frequency modulation signal parameter estimation method based on power spectrum morphological operation. Background technique

[0002] Chirp signal is a kind of pulse compression signal, which has large time-width-bandwidth product characteristics and good anti-interference performance. It is the most commonly used pulse compression signal at present. In the radar system, the accurate estimation of the chirp signal parameters is the prerequisite for obtaining the purpose of the radar and mastering relevant information.

[0003] A chirp signal refers to a signal whose frequency changes linearly with time within a continuous period. The time domain expression of a chirp signal is:

[0004]

[0005] where: f s is the starting frequency, B is the bandwidth, τ is the pulse width, k is the frequency modulation slope, B=kτ. The frequency of a chirp signal varies linearly over the duration of the pulse.

[0006] The chi...

Claims

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