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.
The low-frequency characteristic line spectrum contains significant information about underwater targets, which makes both its detection and control a hot topic of research. Attempts to suppress the characteristic line spectrum by active control strategy are greatly influenced by the tracking effect of the instantaneous information of the line spectrum, and have to deal with two specific technical...
Ship radiated noise is usually comprised of continuously distributed broad-band noises and several narrow-band line spectrum components on discrete frequencies. Generated by periodical machinery rotation and propeller blade rotation, the line spectrum with high strength has its central frequency located in the low frequency range, so that its long-distance transmission loss is small. It is an important...
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.