Bradar Industria S A

Brazil

Bradar Industria S A

Brazil
SEARCH FILTERS
Time filter
Source Type

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 9 more authors.
Remote Sensing | Year: 2016

We present in this work a first assessment of the imaging and topographic mapping capabilities of the InSAeS4 system, which is a single-pass interferometric airborne X-Band Synthetic Aperture Radar (SAR). In particular, we first provide a brief description of the InSAeS4 sensor. Then, we discuss the results of our analysis on the SAR and interferometric SAR products relevant to the first flight-test campaign. More specifically, we have exploited as reference the GPS measurements relevant to nine Corner Reflectors (CRs) deployed over the illuminated area during the campaign and a laser scanner Digital Elevation Model (DEM). From the analysis carried out on the CRs we achieved a mean geometric resolution, for the SAR products, of about 0.14 m in azimuth and 0.49 m in range, a positioning misalignment with standard deviation of 0.07 m in range and 0.08 m in azimuth, and a height error with standard deviation of 0.51 m. From the comparison with the laser scanner DEM we estimated a height error with standard deviation of 1.57 m. © 2015 by the authors; licensee MDPI, Basel, Switzerland.


Da Costa I.F.,Convergent | Da Costa I.F.,Federal University of Itajubá | Arismar C.S.,Convergent | Reis E.,Bradar Industria S A | And 2 more authors.
2015 9th European Conference on Antennas and Propagation, EuCAP 2015 | Year: 2015

This paper describes the development of an optically controlled reconfigurable antenna array based on a slotted circular waveguide for distributed antenna system applications. The novel antenna is composed by four slots, each one optically controlled by a photoconductive switch, with the purpose of making its radiation pattern reconfigurable. Experimental results have been shown in excellent agreement with numerical simulations realized using ANSYS HFSS. The proposed antenna provides a bandwidth of approximately 10% from 5.8 to 6.4GHz and five different radiation pattern configurations depending on photoconductive switches' states. The antenna gain at 5.8 GHz varies from 4.91 to 7.97 dBi. © 2015 EurAAP.


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 6 more authors.
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2015

InSAeS4 is an Italian X band airborne SAR system, recently upgraded to a multi-antenna interferometric configuration. The system is able to acquire single pass across-track and along-track multi-baseline data with different acquisition modes characterized by different geometric resolutions and across-track swaths. In recent work we have analyzed the high resolution InSAeS4 products (obtained by transmitting 400 MHz bandwidth pulses), characterized by the narrowest across-track swath (1.5 Km wide). In this work, we focus on the InSAeS4 products characterized by the widest across-track swath, at expenses of the lowest geometric resolution. To this aim we show some results achieved with an interferometric dataset acquired by the system in 2013 over the Napoli area, Italy. © 2015 IEEE.


Cerqueira S.A.,Convergent | Mologni J.F.,ANSYS Inc. | Da Costa I.F.,Convergent | Da Costa I.F.,Federal University of Itajubá | And 3 more authors.
8th European Conference on Antennas and Propagation, EuCAP 2014 | Year: 2014

This paper reports an accurate numerical analysis of some technological solutions for embedded airborne radars in the P- and X-bands applied to remote sensing. The propagation analyzes are based on Floquet and transient simulations by taken into account the influence of an entire fuselage from a commercial plane and the vegetation electromagnetic characteristics, similar to Amazon rainforest, in order to reproduce a realistic situation. © 2014 European Association on Antennas and Propagation.


Shiroma G.H.X.,Bradar Industria S A | Shiroma G.H.X.,Brazilian Technological Institute of Aeronautics | De Macedo K.A.C.,Bradar Industria S A | Wimmer C.,Bradar Industria S A | And 2 more authors.
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2014

There are basically two methods for retrieving the ground and the canopy height from the interferometric synthetic aperture radar (InSAR) in forested areas. The first method is based on the different dual-band (DB) InSAR height estimation, typically done at X- and P-HH-bands. The second method is based on the modeling of the Polarimetric (Pol) InSAR response of the forest volumetric backscatter, typically at L- or P-band. This paper investigates the possibility of combining both methods, in the sense that the P-band derived ground height is enhanced by the use of the polarimetric data and the RVoG model. In this proposed method, only the ground phase is retrieved from the PolInSAR technique, reducing the numbers of unknowns to be inverted, while the X-band InSAR is used to estimate the canopy. Therefore, we avoid the more complex (and more failure susceptible) inversion of the PolInSAR approach. The data collected in the Amazon region with the OrbiSAR-1 sensor from Bradar (former Orbisat) is used to demonstrate the method. Better ground estimation over range is obtained with the proposed method in comparison with the single-polarization approach for different baselines. © 2014 IEEE.


Shiroma G.H.X.,Bradar Industria S A | De Macedo K.A.C.,Bradar Industria S A
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2015

The random volume over ground model has been successfully used to estimate forest parameters with the interferometric synthetic aperture radar. Besides its typical employment with polarimetric data at lower frequency bands, it has also been used with single-polarimetric X-band data to estimate forest height. Based on this approach, we propose estimating the forest interferometric height and subtract it from the X-band surface model, in order to generate a preliminary model of the terrain using X-band only. Since P-band interferometric phase center is closer to the ground, the use of the preliminary terrain model as reference reduces the interferometric phase modulation, facilitating the phase unwrapping. This is particularly important for PolInSAR terrain height estimation or long baseline interferometry, which is used in dual-band In-SAR to improve the terrain height estimation. Two datasets with three-baselines X-HH and dual-polarimetric P-HH and P-HV data, provided by Bradar, are used to demonstrate the method. © 2015 IEEE.

Loading Bradar Industria S A collaborators
Loading Bradar Industria S A collaborators