微动目标AM-FM信号调幅指数估计方法

Abstract

Abstract: To investigate the micro-motion characteristics of aircraft,a high precision estimation method of amplitude modulation index is developed.First,the echo of micro-motion target is described as an AM-FM signal model in which the frequency of AM is equal to that of FM.Secondly,the deficiencies of traditional methods to estimate AM index are analyzed.The effects on AM index result by frequency modulation are simulated.Thirdly,the Teager non-linear energy tracking operator is used to separate the amplitude from the AM-FM signal.Finally,the spectrum of echo envelope is analyzed,and the AM index is achieved by FFT.Compared with the traditional estimation technique,the proposed method has better precision.

CLC Number:

TN95

SUN Jing, ZHANG Ruo-yu, ZHAO Hong-yu. Amplitude modulation index estimation of AM-FM signal scattered from micro-motion target[J]. Journal of Systems Engineering and Electronics, 2009, 31(10): 2327-2330.

References

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Amplitude modulation index estimation of AM-FM signal scattered from micro-motion target

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