1,721,022 research outputs found
Spectrum Sensing and Sharing for Cognitive Radar Systems
Full text linkThe IEEE 802.22 standard specifies the air interface, including the cognitive medium access control layer (MAC) and physical layer (PHY), of point-to-multipoint wireless regional area networks (WRAN) comprised of a professional fixed Base Station (BS) with fixed and portable user terminals, referred as the Customer Premise Equipment (CPE) devices, operating in the white spaces in the VHF/UHF TV broadcast bands while avoiding interference to the incumbent broadcast services. This work focuses on a Passive Coherent Location (PCL) system that exploits the signals emitted by IEEE 802.22 devices and is referred hereafter as a White Space PCL (WS-PCL) system. To cope with the very low transmitted EIRP of the IEEE 802.22 emitters, we focus on the design of a WS-PCL system that exploits all the useful signals received in each frame, and therefore the signals emitted from both the BS and CPEs. In this work we study the feasibility of the WS-PCL system, we derive the Receiver Operating Characteristic (ROC) of the WS-PCL receiver and we define a multistatic velocity profiling algorithm for the estimation of the target velocity vector. The performances of the proposed receiver are compared with those of a WS-PCL system that exploits only the signal emitted by the BS
Data Fusion in a Multistatic Radar System
No full textThis paper deals with the design and performance evaluation of a multistatic radar system where target detection is performed by jointly combining the signals arising from multiple spatially dispersed transmitters and receivers. We provide some simulation results that illustrate how significant improvements in radar system performances can be achieved by exploiting the Ambiguity Function as tool for determining the target resolution capability of each channel of the multistatic system
Identification and analysis of sea radar clutter spikes
No full textIn recent times, considerable advances have been made on analysing low grazing angle radar sea clutter in the gigahertz frequency range. In this work, a set of coherent and polarimetric sea clutter data is analysed focusing on the statistical and spectral properties of the spikes, whatever is the physical phenomenon that generates them. Using three sea spike defining parameters, the spike amplitude, the minimum spike width and the minimum interval between spikes, it is possible to identify the spiking events from the background. This work shows a sample of results from a statistical and spectral analysis of a set of sea spikes selected from the radar returns, focusing on their Doppler properties, the spike duration and the temporal interval between spikes
Metodi per la risoluzione delle ambiguità in distanza nelle applicazioni radar: confronto tra CA e CRT
No full textDati di clutter di mare in banda X: analisi statistica e prestazioni del ricevitore NAMF
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