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.
Recently invented Clutter Canceller Beamformer (CCB) utilizes 3 beams. The cancellation of sea clutter (or to be more precise external noise) is performed by subtracting the estimated external noise signal received by the Estimator Beam from the Flat Beam and the Difference Beam outputs, respectively. Therefore, only little relative distortion of the respective antenna patterns is desirable. Robustness...
A new type of beamformer has been proposed which uses dynamic clutter cancellation with the help of an auxiliary beam in an external clutter limited scenario like shipborne HF Surface Wave Radar (SWR). The beamformer is compact, ensures reasonable azimuth resolution and unlike the conventional beamformers the azimuth resolution decays gracefully in low Signal to Clutter power Ratio (SCR) scenarios...
Large antenna arrays are very costly and, in particular in the case of shipborne platforms, array dimensions are limited. In order to overcome these constraints for the naval application of a High-Frequency Surface Wave Radar (HF SWR) we propose to make use of multiple ships sailing together within a naval formation. This distributed array will be sparse and we apply the concept of effective aperture...
In order to distinguish between different signal paths, full orthogonal waveforms for each transmit antenna element is desirable for the concept of MIMO radar. We investigate time staggered Frequency Modulated Continuous Wave (FMCW) chirp signals with an individual successive temporal delay larger than the maximum round-trip time of the radar signal. This concept is superior compared to those using...
We present a novel theory and design for constructing microphone arrays to extract spherical harmonic components from sound fields. The proposed non-spherical array structure provides a flexible and alternative design to the traditional spherical microphone arrays with lesser restriction on sensor locations. We use the properties of the associated Legendre functions and the spherical Bessel functions...
This paper introduces a novel cross layer medium access control protocol for multiple beam antennas to fully utilize their multiple-beam-forming capability. Our protocol, explicit synchronization via intelligent feedback (ESIF), uses feedback from neighboring nodes to synchronize data communication at multiple beams. ESIF exploits routing information to guarantee long-term fairness and minimize the...
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.