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J. KIMS Technol > Volume 18(2); 2015 > Article
Journal of the Korea Institute of Military Science and Technology 2015;18(2):115-124.
DOI: https://doi.org/10.9766/KIMST.2015.18.2.115   
Experimental Study on Estimation of Flight Trajectory Using Ground Reflection and Comparison of Spectrogram and Cepstrogram Methods
Ookjin Jung, Yeong-Ju Go, Jaehyung Lee, Jong-Soo Choi
Aerodynamics & Aeroacoustics Laboratory, Department of Aerospace Engineering, Chungnam National University
지면 반사효과를 이용한 비행 궤적 추정에 대한 실험적 연구와 스펙트로그램 및 캡스트로그램 방법 비교
정욱진, 고영주, 이재형, 최종수
충남대학교 항공우주공학과 공기역학 및 공력소음 실험실
Abstract
A methodology is proposed to estimate a trajectory of a flying target and its velocity using the time and frequency analysis of the acoustic signal. The measurement of sound emitted from a flying acoustic source with a microphone above a ground shall receive both direct and ground-reflected sound waves. For certain frequency contents, the destructive interference happens in received signal waveform reflected path lengths are in multiple integers of direct path length. This phenomenon is referred to as the acoustical mirror effect and it can be observed in a spectrogram plot. The spectrogram of acoustic measurement for a flying vehicle measurement shows several orders of destructive interference curves. The first or second order of curve is used to find the best approximate path by using nonlinear least-square method. Simulated acoustic signal is generated for the condition of known geometric of a sensor and a source in flight. The estimation based on cepstrogram analysis provides more accurate estimate than spectrogram.
Key Words: Flight Trajectory Estimation, Ground-Reflect Effect, Time-Frequency Signal Analysis, Time-Delayed Time Analysis
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