Location and estimation parameters of weak wave packets in noise

The method of location of weak wave packets on a noise background is being considered. This method is based on the autoregressive model of a sought signal. A new approach of model parameters determination, its order and noise dispersion, is being offered. Available estimation of the noise dispersion is close to the real one. It allows to define the function of empirical data spectral characteristic change. The analysis of the signal as dynamic invariant in respect of the linear shift transformation yields the function of model consistency. Use of these both functions enables to detect the wave packets at signal to noise ratio as from -20 dB and above. Areas of signal presence were used for estimation of frequency and amplitude by high order autoregressive model with unitary symmetry.