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Most of Ground Penetrating Radars (GPR) are pulsed system, nevertheless there are a number of applications for which Continuous Wave Step Frequency (CWSF) radar can be advantageous. Generally speaking, CWSF systems are more complex then pulse radar, but they can manage larger bandwidth, have larger time efficiency and better control of the band. Furthermore, power, integration time and step of each...
In this paper a rotating antenna GB-SAR, that we named RotoSAR, is proposed and tested. The radar head is fixed at a rotating arm and the antennas are aimed in direction orthogonal to the rotation plane. Potential and limits of this configuration is studied, with simulations and in-field measurements, with particular regard to imagery performances.
In this paper a rotating antenna GB-SAR, that we named RotoSAR, has been proposed and tested. The radar head is fixed at a rotating arm and the antennas are aimed in direction orthogonal to the rotation plane. The obtained results both in simulation and in-field tests, show that imagery quality performances are comparable to the linear SAR. On the other hand, the proposed approach is potentially much...
In this paper a rotating antenna GB-SAR, that we named RotoSAR, has been proposed and tested. The radar head is fixed at a rotating arm and the antennas are aimed in direction orthogonal to the rotation plane. The obtained results both in simulation and in-field tests, show that imagery quality performances are comparable to the linear SAR. On the other hand, the proposed approach is potentially much...
Within the RiSEM project (Seismic Risk of Monumental Building) two different kinds of GPR measurements were performed. The first one was carried out by using an ultra dynamic range — ultra high resolution GPR in order to investigate the presence of hypogeal structures under the “Piazza della Cisterna” (Cistern Square). The second one was carried out by using a non contact 4–8 GHz GPR system specifically...
In this paper the authors present an ultra high resolution and high dynamic range stepped frequency continuous wave radar for masonry investigations. The radar architecture is based on a couple of VCO in a PLL loop and a low noise receiver. This approach is able to cover with 801 steps the 4–8 GHz frequency range obtaining a theoretical range resolution of 37.5 mm in air and a dynamic range higher...
L-C trapped dipole has been a popular dual-band antenna for several decades. Its basic operating principle relies on a couple of parallel resonant circuits that cut-off a part of the dipole branches at a specific design frequency. In this paper a double-frequency (series and parallel) resonant circuit has been designed to operate as a trap and it has been experimentally tested. The advantage of this...
The aim of this work is to design and test a small size and low-cost Doppler disdrometer operating in X-band, able to be integrated in a large scale geographic network. The microwave front-end is based on low cost patch antennas instead of horns, and integrated mixer and amplifier instead a separated electronics. Tests using a controlled drop dispenser and in-field measurements demonstrated the effectiveness...
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