Title :
Passive target motion analysis using multipath differential time-delay and differential Doppler shifts
Author :
Blanc-Benon, P. ; Bienvenu, G.
Author_Institution :
Thomson Sintra ASM, Sophia-Antipolis, France
Abstract :
Target motion analysis (TMA) is a basic function in passive sonar, generally using bearings only or bearings and frequency measurements. But due to the use of arrays whose aperture are practically negligible considering the target range, and even if the platform moves itself to yield a “synthetic array”, the classical TMA methods take minutes to give an acceptable solution. Hence, this paper presents an enhanced TMA estimator using jointly the bearings and multipath parameters: the differential time-delays and their Doppler shifts. The Cramer-Rao lower bounds are studied for two cases of sound propagation: a constant celerity profile and a bilinear one. They both exhibit advantages in terms of a shorter time to get a given precision of the target parameters: its range, depth, and speed vector
Keywords :
Doppler effect; Doppler shift; delays; motion estimation; parameter estimation; sonar arrays; sonar signal processing; underwater sound; Cramer-Rao lower bounds; aperture; bearings measurement; bilinear profile; constant celerity profile; differential Doppler shifts; frequency measurement; multipath differential time-delay; multipath parameters; passive sonar; passive target motion analysis; sound propagation; speed vector; synthetic array; target depth; target motion estimator; target parameters; target range; Acoustic noise; Antenna measurements; Differential equations; Doppler shift; Frequency measurement; Motion analysis; Position measurement; Sonar measurements; State estimation; Velocity measurement;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1995. ICASSP-95., 1995 International Conference on
Conference_Location :
Detroit, MI
Print_ISBN :
0-7803-2431-5
DOI :
10.1109/ICASSP.1995.479550