São José dos Campos, Brazil
São José dos Campos, Brazil

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Perna S.,CNR Institute for Electromagnetic Sensing of the Environment | Perna S.,Parthenope University of Naples | Berardino P.,CNR Institute for Electromagnetic Sensing of the Environment | Britti F.,Consorzio Telaer | And 13 more authors.
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2012

This paper describes the capabilities of the TELAER X-Band airborne SAR system, which has been upgrading according to a Italian National Research Council (CNR) funding. Such a system upgrading consists first of all in the realization of a multi-antenna system able to carry out, simultaneously, Across-Track (XT) and Along-Track (AT) SAR Interferometry (InSAR). Moreover, the system upgrading is also aimed at improving the performances achievable in repeat-pass applications, such as Differential SAR Interferometry, (DInSAR), which require very precise measurement of the tracks described during the flight by the SAR antennas. © 2012 IEEE.


Molina P.,Institute of Geomatics | Fortuny P.,Institute of Geomatics | Colomina I.,Institute of Geomatics | Remy M.,OrbiSat Remote Sensing | And 6 more authors.
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives | Year: 2013

In a large number of scenarios and missions, the technical, operational and economical advantages of UAS-based photogrammetry and remote sensing over traditional airborne and satellite platforms are apparent. Airborne Synthetic Aperture Radar (SAR) or combined optical/SAR operation in remote areas might be a case of a typical "dull, dirty, dangerous" mission suitable for unmanned operation -in harsh environments such as for example rain forest areas in Brazil, topographic mapping of small to medium sparsely inhabited remote areas with UAS-based photogrammetry and remote sensing seems to be a reasonable paradigm. An example of such a system is the SARVANT platform, a fixed-wing aerial vehicle with a six-meter wingspan and a maximumtake-of-weight of 140 kilograms, able to carry a fifty-kilogram pay load. SARVANT includes a multi-band (X and P) interferometric SAR payload, as the P-band enables the topographic mapping of densely tree-covered areas, providing terrain profile information. Moreover, the combination of X- and P-band measurements can be used to extract biomass estimations. Finally, long-term plan entails to incorporate surveying capabilities also at optical bands and deliver real-time imagery to a control station. This paper focuses on the remote-sensing concept in SARVANT, composed by the aforementioned SAR sensor and envisioning a double optical camera configuration to cover the visible and the near-infrared spectrum. The flexibility on the optical payload election, ranging from professional, medium-format cameras to mass-market, small-format cameras, is discussed as a driver in the SARVANT development. The paper also focuses on the navigation and orientation payloads, including the sensors (IMU and GNSS), the measurement acquisition system and the proposed navigation and orientation methods. The latter includes the Fast AT procedure, which performs close to traditional Integrated Sensor Orientation (ISO) and better than Direct Sensor Orientation (DiSO), and features the advantage of not requiring the massive image processing load for the generation of tie points, although it does require some Ground Control Points (GCPs). This technique is further supported by the availability of a high quality INS/GNSS trajectory, motivated by single-pass and repeat-pass SAR interferometry requirements.


Perna S.,Parthenope University of Naples | Perna S.,CNR Institute for Electromagnetic Sensing of the Environment | Amaral T.,Orbisat Remote Sensing | Berardino P.,CNR Institute for Electromagnetic Sensing of the Environment | And 6 more authors.
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2014

TELAER is an Italian airborne X-Band Synthetic Aperture Radar (SAR) system recently upgraded to the interferometric mode thanks to an Italian National Research Council (CNR) funding. This system upgrading has been completed at the beginning of 2013 with a flight-test campaign carried out over the Napoli area, Italy. In this paper we present some results relevant to a single-pass interferometric dataset acquired during these flight-tests. © 2014 IEEE.


Esposito C.,CNR Institute for Electromagnetic Sensing of the Environment | Esposito C.,University of Sannio | Amaral T.,Orbisat Remote Sensing | Lanari R.,CNR Institute for Electromagnetic Sensing of the Environment | And 6 more authors.
Joint Urban Remote Sensing Event 2013, JURSE 2013 | Year: 2013

The paper addresses the analysis of high resolution interferograms relevant to urban areas and achieved by means of the X-band OrbiSAR system. The OrbiSAR system is an airborne SAR sensor capable of acquiring single pass and repeat pass interferometric SAR data at very high resolution. Such a system is thus capable of providing very appealing single-pass and repeat-pass interferometric data-sets characterized by high resolution. In this work, two data-sets, acquired over the urbanized cities of São José dos Campos and São Sebastião-SP, Brazil, will be analyzed with a twofold aim: first, to provide insight for the retrieval of high accuracy DEM on urbanized areas, second to show some results obtainable with the airborne Differential SAR Interferometry technique over urban areas. © 2013 IEEE.


Perna S.,Parthenope University of Naples | Perna S.,CNR Institute for Electromagnetic Sensing of the Environment | Esposito C.,CNR Institute for Electromagnetic Sensing of the Environment | Esposito C.,University of Sannio | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Synthetic Aperture Radar Interferometry (InSAR) is a technique for the generation of Digital Elevation Models (DEMs) of an observed scene. It exploits the phase difference (interferogram) of two SAR images relevant to the same area and acquired by two different look angles. To recover the topographic information from an InSAR data pair, it is necessary to evaluate a proper phase offset value to add to the unwrapped SAR interferogram. Generally, such a phase offset is accurately estimated by using Corner Reflectors (CRs) properly deployed over the illuminated area. Nevertheless, in some cases of practical interest, CRs cannot be used: in order to overcome this limit, different algorithms have been proposed in literature. In this paper, we present an algorithm aimed at estimating the InSAR phase-offset without using CRs. To this aim, we first present a theoretical analysis, validated by experiments carried out on simulated data, for the evaluation of the phase offset and, thereafter, we apply the proposed method on real data acquired by the X-band airborne OrbiSAR system. Comparisons with results achieved by using CRs properly deployed over the test site are also included. © 2013 SPIE.


Perna S.,CNR Institute for Electromagnetic Sensing of the Environment | Perna S.,Parthenope University of Naples | Esposito C.,CNR Institute for Electromagnetic Sensing of the Environment | Esposito C.,University of Sannio | And 4 more authors.
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2013

Synthetic Aperture Radar Interferometry (InSAR) allows the generation of Digital Elevation Models (DEMs) exploiting the phase difference (interferogram) of SAR data pairs relevant to the same illuminated area and received by slightly different look angles. © 2013 IEEE.


De Macedo K.A.C.,OrbiSat Remote Sensing | Wimmer C.,OrbiSat Remote Sensing | Barreto T.L.M.,OrbiSat Remote Sensing | Lubeck D.,OrbiSat Remote Sensing | And 3 more authors.
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2011

Recently, some experiments demonstrated that reliable DIn-SAR measurements can be achieved at any band and that further time-series analyses can be applied for airborne data. However, most of the airborne DInSAR results, including the time-series, published so far have focused on short-term analyses (baselines within hours or few days). This paper presents the first worldwide airborne DInSAR survey at P- and X-band for measuring the land movements occurred within 1 year and 3 months. The survey was performed by the OrbiSAR system of OrbiSat under contract with Petrobras (CENPES), as part of a experiment with the objective to identify possible threats to the pipeline due to land movements in São Sebastião-SP, Brazil. The measurements at P-band show reliable and coherent movements in 80% of the imaged vegetated areas with accuracy in the order of centimeters. At X-band we were able to reliably measure coherent movements in urban areas with accuracy in the order of millimeters. Through field work evidences, the paper analyses the causes of these small scale land movements, and howthey are related to geodynamic processes. A comparison between the DInSAR and in-loco inclinometer measurements is presented. The paper suggests some possible operational scenarios and discusses on the potential of the airborne DInSAR for land movement monitoring. © 2011 IEEE.


Remy M.A.,OrbiSat Remote Sensing | De MacEdo K.A.C.,OrbiSat Remote Sensing | Moreira J.R.,OrbiSat Remote Sensing
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2012

In this paper we present the design overview of the UAV-based P- (repeat-pass) and X-band (single-pass) interferometric SAR system of OrbiSat, Brazil. The main objective is to built a compact and flexible InSAR system capable of performing accurate topographic survey and differential interferometry. To our knowledge, this is the first UAV-based In-SAR system with such characteristics, multi-band and fixed-baseline (X-band), to be projected. The status, and some main project results and solution are described and depicted. © 2012 IEEE.


Perna S.,CNR Institute of Neuroscience | Perna S.,Parthenope University of Naples | Wimmer C.,Orbisat Remote Sensing | Moreira J.,Orbisat Remote Sensing | Fornaro G.,CNR Institute of Neuroscience
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2010

Differential SAR Interferometry (DInSAR) is a remote sensing technique which allows monitoring ground deformation with accuracy of the order of the transmitted wavelength by exploiting the phase difference (interferogram) of two temporally separated SAR images relevant to the same area. In addition, when more than two multi-pass acquisitions relevant to the same area are available, they can be properly combined by means of recent multitemporal DInSAR algorithms, in order to detect and follow the temporal evolution of ground deformation via the generation of spatially dense time series. Such a multitemporal DInSAR technique is nowadays developed and operative with space-borne SAR data, whereas specific problems may limit its application to airborne data. In this work, starting from the results already shown in previous works and relevant to an X-Band airborne DInSAR experiment carried out over the Perugia area (center of Italy) by using the OrbiSAR system, we carry out a DInSAR multitemporal analysis of data relevant to a 16 km (in azimuth) by 4 km (in range) region. © 2010 IEEE.


De MacEdo K.A.C.,Orbisat Remote Sensing | Wimmer C.,Orbisat Remote Sensing | Barreto T.L.M.,Orbisat Remote Sensing | Lubeck D.,Orbisat Remote Sensing | And 3 more authors.
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing | Year: 2012

Recently some experiments demonstrated that reliable DInSAR measurements can be achieved at any band and that further time-series analyses can be applied to airborne data. However, most of the airborne DInSAR results, including the time-series, published so far have focused on short-term analyses (baselines within hours or few days). This paper presents the first long-term airborne DInSAR survey at P- and X-band with temporal baselines of 1 year and 3 months. The survey was performed by the OrbiSAR system of OrbiSat under contract with Petrobras (PROTRAN), as part of a project to investigate the potential of DInSAR technique to identify, prior to structural damage, geohazards threats to the oil/gas pipelines in So SebastioSP, Brazil. After 1 year and 3 months, the P-band data have interferometric coherence equal or greater than 0.3 for approximately 80% of the imaged dense vegetated areas. At X-band, we achieved coherence equal or greater than 0.3 in the urban area. After removing all residual motion errors with proper up-to-date processing, we derived, for the P-band data, land movements with absolute accuracy in the order of centimeters. For X-band we derived land movement measurements with absolute accuracy in the order of millimeters. Through field work evidences, the paper analyses the causes of these centimeter to millimeter land movements, and how they are related to geodynamic processes and geohazard risks. A comparison between the DInSAR and in-loco inclinometer measurements is presented. The paper suggests some possible operational scenarios and discusses on the potential of the airborne DInSAR for geohazard risk monitoring. © 2012 IEEE.

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