Title :
Frequency estimation of laser signals with time-varying amplitude from phase measurements
Author :
Galtier, Frédéric ; Besson, Olivier
Author_Institution :
Dept. of Avionics & Syst., ENSICA, Toulouse, France
Abstract :
This paper addresses the problem of estimating particle´s velocity in the vicinity of an aircraft by means of a laser velocimeter. A model for the signal generated by a particle of air passing through a probe volume consisting of equidistant bright and dark fringes is given. From this model, a frequency estimator based on the phase of the correlation sequence of the signal is proposed. A theoretical analysis of the frequency estimator is presented. In particular, a formula for the variance of the estimate is derived under the assumption of small estimation errors. Numerical examples confirm the validity of the analysis. Finally, the effectiveness of the proposed algorithm is demonstrated on real data
Keywords :
aircraft; error analysis; frequency estimation; laser velocimetry; optical correlation; optical information processing; phase measurement; aircraft; algorithm; bright fringes; correlation sequence; dark fringes; frequency estimation; laser signals; laser velocimeter; particle velocity estimation; phase measurements; probe volume; real data; signal generation; small estimation errors; time-varying amplitude; Additive white noise; Aerospace electronics; Aircraft; Estimation error; Frequency estimation; Frequency measurement; Phase estimation; Phase measurement; Probes; Velocity measurement;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1997. ICASSP-97., 1997 IEEE International Conference on
Conference_Location :
Munich
Print_ISBN :
0-8186-7919-0
DOI :
10.1109/ICASSP.1997.604816
