NDLI: Signal processing of acoustic ranging in GPS/Acoustic seafloor geodesy

Content Provider	IEEE Xplore Digital Library
Author	Kido, M. Fujimoto, H. Osada, Y.
Copyright Year	2011
Description	Author affiliation: RCPEV, Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai, 980-8578 Japan (Kido, M.; Fujimoto, H.; Osada, Y.)
Abstract	Acoustic signal processing is crucial for precise positioning of a seafloor transponder in GPS/Acoustic seafloor geodesy, which aims at 1 cm-precision. For this purpose, pseudorandom signals are usually employed for acoustic ranging. Considering the characteristics of the signal and the typical frequency of 10 kHz in carrier wave, detecting an arrival-time with 0.01 ms (∼0.75 cm) resolution in round trip can be readily achieved if the correct peak in correlogram is identified. However, due to sidelobes around the peak and pseudo peaks associated with possible multipath, a simple algorithm detecting the maximum peak often results in a wrong peak, which has a offset with a wavelength or larger from the correct peak. In our numerical study, behavior of the pseudo peak is found being quite complex having a no-integer wavelength offset when a short-range multipath is superimposed. Our observed data clearly show nadir-angle dependence in the appearance of received signals. This is attributed to significant change in the short-range multipath with angle within a sound-hood of a transducer as well as transducer characteristics itself. In this study, firstly we demonstrate the complexity in the behavior of the sidelobes with varying offset of multipath. Then, we analyze observed signal to reveal the angle-dependency of our transducer with different types of sound-hoods.
Starting Page	1
Ending Page	6
File Size	871185
Page Count	6
File Format	PDF
ISBN	9781457701658
e-ISBN	9781457701641
DOI	10.1109/UT.2011.5774105
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-04-05
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transducers Transponders Correlation Global Positioning System Acoustics Acoustic measurements Sea surface
Content Type	Text
Resource Type	Article

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