TY - JOUR N2 - In this paper, we present the methods to detect the channel delay profile and the Doppler spectrum of shallow underwater acoustic channels (SUAC). In our channel sounding methods, a short impulse in form of a sinusoid function is successively sent out from the transmitter to estimated the channel impulse response (CIR). A bandpass filter is applied to eliminate the interference from out-of-band (OOB). A threshould is utilized to obtain the maximum time delay of the CIR. Multipath components of the SUAC are specified by correlating the received signals with the transmitted sounding pulse with its shifted phases from 0 to 2π. We show the measured channel parameters, which have been carried out in some lakes in Hanoi. The measured results illustrate that the channel is frequency selective for a narrow band transmission. The Doppler spectrum can be obtained by taking the Fourier transform of the time correlation of the measured channel transfer function. We have shown that, the theoretical maximum Doppler frequency fits well to that one obtained from measurement results. L1 - http://journals.pan.pl/Content/112101/PDF/aoa.2019.128501.pdf L2 - http://journals.pan.pl/Content/112101 PY - 2019 IS - No 2 EP - 383 DO - 10.24425/aoa.2019.128501 KW - shallow underwater acoustic KW - channel parameters detection KW - channel delay profile KW - Doppler spectrum A1 - Nguyen, Van Duc A1 - Nguyen, Tien Hoa A1 - Ho, Hoa Xuan Thi PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 44 DA - 2019.06.13 T1 - Methods to Estimate the Channel Delay Profile and Doppler Spectrum of Shallow Underwater Acoustic Channels SP - 375 UR - http://journals.pan.pl/dlibra/publication/edition/112101 T2 - Archives of Acoustics ER -