The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This study proposes an algorithm to estimate the alignment errors of an ultra short baseline (USBL) navigation system. This algorithm is based on positioning errors caused by heading, pitch, and roll misalignments, respectively, when running a straight-line USBL transponder positioning. The positioning errors arising from each of the angular misalignments were derived. The differences of positioning...
To support modeling acoustic backscatter from the seafloor, a conductivity probe and a laser line scanner were deployed jointly to measure bottom roughness during an experiment off the New Jersey coast in summer 2006. The conductivity probe in situ measurement of porosity (IMP2) is impervious to water turbidity and yields a 1-D profile with 10-mm horizontal spacing and 1-mm resolution in the vertical...
Sound waves are highly conductive in the ocean; therefore, they are used in various aspects of underwater applications like, environment exploration, underwater target detection and signal transmission. For all these applications, underwater acoustic signal logging is one of the key elements of the system. In laboratory setup, data recorders are often configured on a single-board computer, industrial...
For many undersea research application scenarios, instruments need to be deployed for more than one month which is the basic time interval for many phenomena. With limited power supply and memory, management strategies are crucial for the success of data collection. For acoustic recording of undersea activities, in general, either preprogrammed duty cycle is configured to log partial time series,...
The goal of this work is to design and fabricate a autonomous acoustic recording system which is low cost, reconfigurable and portable for acoustic research. In the commercial market, some off-the-shelf audio systems are taken as a core unit and modified into underwater acoustic logger. Generally, these consuming products have some built-in filters and compression algorithms such that the recorded...
Knowing the temporal change of the seabed, we can understand the nature of the undersea environment in more details. The scale of the features on the seabed varies from meters for large sandwaves, and down to less than one millimeter for the prints left by marine creatures. So far, there is not a single instrument that can cover the whole range and still preserve the resolution. For measuring small-scale...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.