Papers by giovanni alberti
Zenodo (CERN European Organization for Nuclear Research), Mar 1, 2022
Remote Sensing, 2019
This work is aimed at showing the present capabilities and future potentialities of an imaging ra... more This work is aimed at showing the present capabilities and future potentialities of an imaging radar system that can be mounted onboard flexible aerial platforms, such as helicopters or small airplanes, and may operate in the UHF and VHF frequency bands as Sounder and as Synthetic Aperture Radar (SAR). More specifically, the Sounder operates at 165 MHz, whereas the SAR may operate either at 450 MHz or at 860 MHz. In the work, we present the first results relevant to a set of Sounder and SAR data collected by the radar during a helicopter-borne campaign conducted in 2018 over a desert area in Erfoud, Morocco, just after the conclusion of a system upgrading procedure. In particular, a first analysis of the focusing capabilities of the Sounder mode and of the polarimetric and interferometric capabilities of the SAR mode is conducted. The overall system, originally developed by CO.RI.S.T.A. according to a ASI funding set up in 2010, has been upgraded in the frame of a contract signed in...
2008 IEEE Radar Conference, 2008
Science, 2007
Mars' polar regions are covered with ice-rich layered deposits that potentially contain a rec... more Mars' polar regions are covered with ice-rich layered deposits that potentially contain a record of climate variations. The sounding radar SHARAD on the Mars Reconnaissance Orbiter mapped detailed subsurface stratigraphy in the Promethei Lingula region of the south polar plateau, Planum Australe. Radar reflections interpreted as layers are correlated across adjacent orbits and are continuous for up to 150 kilometers along spacecraft orbital tracks. The reflectors are often separated into discrete reflector sequences, and strong echoes are seen as deep as 1 kilometer. In some cases, the sequences are dipping with respect to each other, suggesting an interdepositional period of erosion. In Australe Sulci, layers are exhumed, indicating recent erosion.
IEEE Transactions on Geoscience and Remote Sensing, 1992
We have augmented the N zXSA I)C-8 AIRSAR instrument with a pair of C-band antennas displaced acr... more We have augmented the N zXSA I)C-8 AIRSAR instrument with a pair of C-band antennas displaced across track to form an interferomc.ter sensitive to topographic variations of the Earth's surface. The antennas were developed by the Italian consortium Co.Ri.S.T.A., under contract to the Italian Space Agency (ASI), while the AIRSAR instrument and modifications to it supporting TOPSAR were sponsored by NASA. A new data processor was developed al JPl. for producing the topographic maps, and a second processor was developed at Co.Ri.S.T.A. All the results presented below were processed at JPL. During the 1991 DC-8 flight campaign, data were acquired over several sites in the United States and Europe, and topographic maps were produced from several of the.se flight lines. Analysis of the results indicate that statistical errors arc. in the 2-3 m range for flat terrain and in the 4-5 m range for mountainous areas.
The MARSIS and SHARAD subsurface radar sounders have been observing the Martian polar terrains, w... more The MARSIS and SHARAD subsurface radar sounders have been observing the Martian polar terrains, which are considered a close analogue to the material forming the crusts of Europa and Ganymede. MARSIS and SHARAD results are reviewed and discussed, and expected capabilities and challenges for similar instruments on the two Jovian moons are assessed.
This paper presents an airborne SAR interferometer simulator which uses a coherent approach based... more This paper presents an airborne SAR interferometer simulator which uses a coherent approach based on a pulse-by-pulse synthesis in time domain and takes into account the sensor parameters and its observation geometry as well as the trajectory and attitude dynamics of the aircraft. Preliminary experimental results are presented in order to assess the interferometric simulator performance in terms of its
The Cassini RADAR has collected twelve altimeter data sets of Titan since the beginning of the Sa... more The Cassini RADAR has collected twelve altimeter data sets of Titan since the beginning of the Saturn Tour in 2004. Most of the altimeter measurements were made at high altitudes, from 4,000 km to 15,000 km, resulting in low spatial resolutions due to beam footprint sizes larger than 20 km, as well as short ground tracks less than 600 km. One flyby (T30) was dedicated to altimeter data collection from 15,000 km to the closest approach altitude of 950 km. This produced a beam footprint size of 6 km at the lowest altitude and an altimeter ground track of about 3,500 km covering Titan's surface from near the equator to high latitude areas near Titan's north pole. More importantly, the ground track is located inside the SAR swath viewed from an earlier Titan flyby (T28). This provides a rare opportunity to investigate Titan topography with a relatively high spatial resolution and compare nadir-looking altimeter data with side-looking SAR imaging. From altimeter data, we have measured the mean Titan radius of 2575.1 km +/- 0.1 km and observed rather complex topographical variations over a short distance. By comparing altimeter data and SAR images at altitudes below 2,000 km, we have found that there is a strong correlation between SAR brightness and altimeter waveform; SAR dark areas correspond to strong and sharp altimeter waveforms while SAR bright areas correspond to weak and diffused altimeter waveforms. The research described here was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Lpi Contributions, Aug 1, 2007
... Cassini Altimetry Working Group that has made great efforts for the assessment of processing ... more ... Cassini Altimetry Working Group that has made great efforts for the assessment of processing algorithms for the retrieval of Titan's surface height. This team has been initiated by a joint agreements between ASI and NASA and it has been coordinated by Enrico Flamini and ...
Agu Fall Meeting Abstracts, Dec 1, 2007
Planetary exploration by means of radar systems, mainly using Ground Penetrating Radars (GPR) pla... more Planetary exploration by means of radar systems, mainly using Ground Penetrating Radars (GPR) plays an important role in Italy. Numerous scientific international space programs are currently carried out jointly with ESA and NASA by Italian Space Agency, the scientific community and the industry. Three important experiments under Italian leadership ( designed and manufactured by the Italian industry), provided by ASI
ENVISAT Microwave Radiometer (MWR) is an instrument designed and developed as part of the Envisat... more ENVISAT Microwave Radiometer (MWR) is an instrument designed and developed as part of the Envisat-1 satellite scientific payload, with Alenia Aerospazio engaged in the phase C-D as instrument Prime Contractor, leading an industrial consortium of European and American companies. The Flight Model of the Instrument was delivered to ESA at the end of July 1997, after successful completion of design,
International Journal of Remote Sensing
SHARAD (SHAllow RADar), the sounding instrument provided by the Italian Space Agency, is particip... more SHARAD (SHAllow RADar), the sounding instrument provided by the Italian Space Agency, is participating as Italian facility instrument on board the Mars Reconnaissance Orbiter, a NASA's mission which is on a search for evidence that water persisted on the red planet surface for a long period of time. This paper is meant to provide an overview of SHARAD operations and mission outcomes and a short summary of the achieved science results.
The Radar instruments allow to investigate the planet's sub-surface. The Planetary Radar Oper... more The Radar instruments allow to investigate the planet's sub-surface. The Planetary Radar Operation Center joins different missions with the purpose of the processing and divulging Radar data and relative works. This paper presents the PROC system with its architecture and functionalities.
Through a feasibility study funded by the European Space Agency (ESA), the authors analysed the p... more Through a feasibility study funded by the European Space Agency (ESA), the authors analysed the possibility of using the innovative concepts of bistatic altimetry to enhance the spatial sampling of topography measurements over the oceans. Purpose of this paper is thus to review the major results of the mission design, focusing on the spacecraft configuration, mission analysis and the descripition
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Papers by giovanni alberti