Abstract: For signals which have the damped amplitude and very low signal-to-noise ratio, the most commonly used methods to estimate parameters are FT, MEM, LPSVD and so on.The results yielded, however, are not satisfactory.Taking the features of the signals into consideration, this paper provides an algorithm modified according to ESPRIT (estimation of signal parameters via rotational invariance techniques)and better results are obtained. A comparison of simulated results with several estimation methods is also given.

Key words: Damped Signals, SNR, Rotational Invariance Techniques, Order Selection