Time-Frequency Analysis of the Doppler Signals by Moving Targets

Son, Joong-Tak; Lee, Seung-Houn; Park, Kil-Houm

Journal of the Korea Institute of Military Science and Technology 2005;8(2):38-48.

Joong-Tak Son, Seung-Houn Lee, Kil-Houm Park

¹
²3B System Inc.
³KNU

이동 표적에 의한 도플러 신호의 시간-주파수 분석

손중탁, 이승훈, 박길흠

¹국방과학연구소
²쓰리비 시스템
³경북대학교

Abstract

Instantaneous frequency of doppler signals is used to get the information of the relative velocity and the miss distance between a missile and a corresponding target. In this paper, we have performed time-frequency analysis and instantaneous frequency estimation with Short Time Fourier Transform(STFT), Wigner Ville Distribution(WVD) and Continuous Wavelet Transform(CWT) about the doppler signals generated by moving targets. Performance evaluation was performed using simulated doppler signals generated by a single moving target and two moving targets. From the results of the time-frequency analysis, we found that WVD method was the most efficient instantaneous frequency estimator among the three methods. But in case of two moving targets, WVD method got cross talks and CWT method got oscillation when two doppler frequencies were close to each other.

Key Words: Instantaneous Frequency, Doppler Signal, Short Time Fourier, Transform, Wigner Ville Distribution, Continuous Wavelet Transform