45,115 research outputs found
High Range Resolution Multichannel DVB-T Passive Radar: Aerial Target Detections
No full textThe exploitation of multiple DVB-T channels for a passive radar system has been considered to enhance the radar range resolution. A preliminary study has focused on the AF analysis to verify the suitability of a multichannel DVB-T signal for radar applications. The theoretical study has been supported by preliminary measurements relative to three adjacent DVB-T channels. Experimental results in an aerial scenario through the use of SDR hardware have been carried out and showed a clear improvement in range resolution when using multichannel rather than single channel DVB-T signals. It may be proven in the near future that target classification of noncooperative target radar imaging will be enabled by a high resolution DVB-T passive radar that is obtained by exploiting multichannel DVB-T signals
Target-borne ECM against OFDM-based Imaging Passive Radars
No full textPassive radars are notoriously robust to jamming because the receiver location cannot be detected. Moreover, the use of OFDM based reference signals further improves the robustness against jammers. Nevertheless, recent papers have shown that deception/spoofing-type of jamming may still be possible. The idea was to use a target-on-board deception jammer aimed at deceiving the receiver by preventing it from precisely locating and identifying the target when passive radar imaging is used. In this paper, the same authors test the proposed approach by using a measured DVB-T reference signal. A realistic scenario is emulated by using a multichannel DVB-T signal (three DVB-T channels- A bout 24 MHz bandwidth)
Use of interleukin-2 in the management of haematological malignancies: focus on minimal residual disease. Mandelli F, Capria S, Vignetti M, Meloni G.
No full textInterleukin (IL)-2 is a glycoprotein lymphokine which induces proliferation of all subclasses of T-lymphocytes, natural killer cells and lymphokine activated killer cells, differentiation of cytotoxic cells and secretion of other cytokines, especially interferon-gamma. A fundamental property of IL-2 activated effector cells is to selectively lyse freshly isolated tumour cells. Work carried out on animal tumour models and application in human therapeutics has suggested the potential value of an immunotherapeutic approach in haematological malignancies, especially in the setting of minimal residual disease. Extensive phase I/II trials have been conducted in all haematological diseases, but the most interesting results have been obtained in acute myeloid leukaemia and non-Hodgkin's lymphoma, where the possibility of achieving partial and complete responses in patients with advanced disease has been reported. The feasibility and immunomodulatory effects of IL-2 treatment in patients with minimal residual disease after high-dose chemotherapy have also been explored. However, the heterogeneity of cases treated and administration schedules used does not allow definitive conclusions to be drawn about the true impact of IL-2 treatment on the prognosis of these patients. The clearly encouraging results reported in the literature deserve further investigation from a biological and clinical point of view; until the role of IL-2 in haematological malignancies has been identified, it should be used only in the investigative setting of clinical trials
Analysis of tectonics and cryovolcanism on Ganymede: possible observations with JGO-EJSM
No full textVoyager data revealed that the Jovian moon
Ganymede, the biggest satellite in the solar system,
consists of ancient heavily cratered dark terrain and
younger resurfaced and tectonically deformed bright
terrain (groove lanes and polygons). These terrains
seem to have undergone an intense resurfacing and
several models were developed. However both
Voyager data and successively in 1996 Galileo SSI
(Solid State Imager) images did not have a spatial
resolution high enough to define the most likely
resurfacing phenomena. In particular Galileo data
coverage is not global (fig. 1) and there is a great
heterogeneity in the spatial resolution going from
more than 500 m/pixel in some areas to 100 m/pixel
in a very few areas. The WAC (Wide Angle Camera),
which should be on board the ESA mission JGOEJSM,
will provide a global coverage of Ganymede’s
surface with a constant spatial resolution of 150
m/pixel to perform in-depth geologic studies
DVB-T Passive Radar for Vehicles Detection in Urban Environment
No full textPassive radar systems exploit non-cooperative transmitter to detect targets in areas of interest. Some of the main advantages of such systems with respect to conventional radars include low cost architectures, low energy requirements and potentially null probability of intercept. In this paper a low-cost solution for vehicles detection making use of passive radar concept is presented. A Software Defined Radio (SDR) solution and commercial antennas have been used to realize a DVB-T passive radar demonstrator. An analysis of the DVB-T signal is firstly presented together with a study of its capability as radar waveform. Afterwards an experimental setup is presented and analysed and finally some results of targets detection are shown.</p
HIGH RANGE RESOLUTION MULTICHANNEL DVB-T PASSIVE RADAR
No full textA method for improving range resolution in passive radar system is to jointly use more than one transmission channel of the same illuminator of opportunity (IO). This paper specifically focuses on the exploitation of multiple adjacent digital video broadcasting-terrestrial (DVB-T) channels for achieving high-range resolution profiles with a passive radar system operating in air surveillance scenario. Firstly, we present an analysis of the ambiguity function obtained from a multichannel DVB-T source and a pre-processing technique able to improve the characteristics of the multichannel signal are presented. Afterwards, the experimental scenario is defined and detection results on aerial targets are shown
High Resolution Multichannel DVB-T Passive Radar
No full textThe exploitation of multiple DVB-T channels for a passive radar system has been considered to enhance the radar range resolution. A preliminary study has focused on the AF analysis to verify the suitability of a multichannel DVB-T signal for radar applications. The theoretical study has been supported by preliminary measurements relative to three adjacent DVB-T channels. Experimental results in an aerial scenario through the use of SDR hardware have been carried out and showed a clear improvement in range resolution when using multichannel rather than single channel DVB-T signals. It may be proven in the near future that target classification of noncooperative target radar imaging will be enabled by a high resolution DVB-T passive radar that is obtained by exploiting multichannel DVB-T signals.</p
Unidentified emission lines in comets: recognition and implementation in the comet lines tool at the IDIS Small Bodies and Dust Node
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