Author:
Saravanakumar A.,Senthilkumar K.,Sadasivan S.
Abstract
This paper addresses a method for estimating the linear flying trajectory of a fixed-wing aircraft based on narrow-band passive acoustical technique, which measures the instantaneous frequency of the acoustic signal emitted by the target and received by Acoustic Vector Sensor (AVS) placed on the ground. AVS consist of one microphone and three vector sensors orthogonal to each other. The received instantaneous frequency varies due to the acoustical Doppler Effect under the condition that the target flies at a constant velocity and the trajectory is a straight line. A four parameter model was developed to describe the aircraft trajectory. The four parameters are the targets travel speed, the source acoustical frequency, the time at which the target gets to the closest point of approach (CPA) to the sensor, and the CPA slant range to the sensor. Nonlinear least square (NLS) theory was used to estimate these parameters. The three dimensional AVS consists of three orthogonally placed particle velocity sensors and one sound pressure microphone. The four parameters mentioned above are measured using microphone. The particle velocity sensors are used for finding the direction of acoustic source.
Reference14 articles.
1. Brian G. Ferguson., Lionel G. Criswick and Kam W. Lo., "Locating Far-field Impulsive Sound Sources in Air by Triangulation", J. Acoustic. Soc. Am., Vol.111, No.1, 2002.
2. Arye Nehorai and Eytan Paldi., "Acoustic Vector- Sensor Array Processing", IEEE Transaction on Signal Processing, Vol. 42, No.9, 1994, pp.2481-2491.
3. Brian G. Ferguson and Kam,W. Lo., "Turboprop and Rotary Wing Aircraft Flight Parameter Estimation Using Both Narrow-band and Broadband passive Acoustic Signal-processing Methods", Acoustical Society of America, 2009.
4. Ferguson, B.G. and Quinn, B.G., "Application of the Short-time o Fourier Transform and the Wigner- Ville Distribution to the Acoustic Localization of Aircraft", J. Acoust. Soc. Am., Vol.96 (2), 1994, pp.821l-827.
5. Kam, W. Lo.and Ferguson, B.G., "Broadband Passive Acoustic Technique for Target Motion Parameter Estimation", IEEE Transactions of Aerospace and Electronic Systems, 2000.