NDLI: Performance of the matched filter in sonar systems having time variable gain

Content Provider	IET Digital Library
Author	Rashed, Muhammad Salman Meijer, Marco Teal, Paul D.
Abstract	Acoustic wave propagation incurs a loss in an underwater acoustic channel. In sonar systems, a time variable gain (TVG) is used to compensate for this loss. The channel noise in the received signal is assumed to be white and stationary. The TVG transforms the noise in the received signal so that it is still white but no longer stationary. The authors calculate the signal-to-noise ratio (SNR) improvement at the output of a matched filter h based on white, stationary noise, and compared this with the output of a filter h ′ specially designed to match the signal when the noise is altered by TVG. The results reveal that there is a small SNR improvement for longer codes at short ranges with the filter h ′ . They study the sensitivity of the sidelobes to a timing mismatch in applying the TVG. Using h ′ , the degradation of the correlation sidelobes is considerable. In most cases, it appears that designing the filter h ′ to account for non-stationary of the noise is not warranted, which is a novel conclusion. Regardless of the receiver filter, accuracy in applying the TVG is still important, as even a slight mismatch in its application can be detrimental.
Starting Page	425
Ending Page	430
Page Count	6
ISSN	17518784
Volume Number	14
e-ISSN	17518792
Issue Number	Issue 3, Mar (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/14/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2019.0334
Journal	IET Radar, Sonar & Navigation
Publisher Date	2019-12-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Acoustic And Other Telecommunication System And Equipment Acoustic Signal Processing Acoustic Wave Propagation Anisotropic Media Channel Noise Filtering Method in Signal Processing Filtering Theory Longer Code Matched Filter Nonstationary Noise Received Signal Receiver Filter Signal Processing And Detection Signal-to-noise Ratio Improvement SNR Improvement Sonar System Stationary Noise Time Variable Gain Timing Mismatch TVG Transforms Underwater Acoustic Channel Underwater Acoustic Communication White Noise
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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