Speaker
Description
This technique enables to obtain more credible detection results as it minimizes probability of false alarm with designated detection probability. The technique is based on the principle of Λ likelihood ratio maximization with joint recording of pressure pulsations and wind speed. As Λ assessment criterion the technique uses the product of conditional probability ratios for independent functionals: F1, F2 of joint recording of functional Fdet calculated on the basis of data from pressure pulsation measurement channel. Λ numerator is composed of probabilities product P(Fi) that is calculated subject to signal S_k availability. Λ denominator is composed of probabilities product P(Fi) that is calculated subject to the absence of signal. A decision on signal detection is made when Λ exceeds the threshold level corresponding to detection probability. Signal parameters S are determined as Λ(S)reach maximum value. It is proposed to use dependence of pressure root-mean-square error on mean wind speed as functional F1 and correlation factor r of time derivatives of pressure and wind speed as functional F2 (acquisition data are passed preliminarily through a low-pass filter). STA/LTA and PMCC (multichannel multiple cross-correlation) methods can be used in determining Fdet.
