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In this paper the Two-Scale Model has been used to derive the theoretical Normalized Radar Cross Section (NRCS) for sea clutter in the L-band, taking into account also the circular polarization of GPS signals. Using this theoretical model and the theoretical formula for NRCS, authors aim to investigate the possibility to extend target detection through GPS signals in backscattering configuration by...
The main purpose of this study is to propose and validate a new algorithm for wind speed retrieval over the ocean using Global Navigation Satellite System-Reflectometry (GNSS-R). The proposed method is based on a Least Squares (LS) estimation from the volume of the scattered power function. Real DDMs collected by the space GNSS receiver-remote sensing instrument (SGR-ReSI) on board the TechDemoSat-1...
The capability of discriminating radar targets exhibiting multiple moving parts has become of great interest for both aerospace and ground-based target recognition and analysis. In particular, helicopters and other targets with rotors, as for instance miniature Unmanned Aerial Vehicles, exhibit peculiar characteristics in the radar return that can be used for their recognition. In this paper a novel...
Authors in this work aim to present new analysis methods for Earth Observation, developed by processing Sentinel-1 and Landsat-8 satellite data and combining them in an original way. Comparing SAR and Optical/Multispectral data is a procedure already in use because they are two acquisition systems that provide very different and therefore complementary and useful information. Even if the combination...
In this work, authors outline how measurements from different types of sensors can be put together to characterize in an extensive way a sensitive waste dump site. Terrestrial surveying systems and aerial images have been combined with satellite remote sensing techniques to get a complete overview of the surface stability and its thermal characteristics in conjunction with geomorphological conditions...
The Nadir reflectances, measured by the SCIAMACHY hyperspectral sensor, are used to retrieve vertical column concentrations of nitrogen dioxide (NO2), resulting from anthropogenic pollution. The estimation process is realized via a blind source separation method: the unmixing of the NO2 spectral waveform from the overall atmospheric absorption contribution within the logarithmic reflectance spectra...
A new approach for simulation of delay-Doppler maps for ocean global navigation satellite system reflectometry is presented. The simulator is based on a stochastic forward scattering model for generation of realizations of the sea surface reflected signal and allows a flexible definition of system and environmental parameters. The signal scattered from a delay Doppler cell is modelled as the coherent...
In this paper data from different sources have been used to monitor and characterize in a more extensive way a site of interest. The objective has been to implement a broad monitoring system through the combination of different data sources in order to control the whole area. Terrestrial surveying systems and aerial images have been combined with satellite remote sensing techniques in order to get...
A novel approach for the design and simulation of a new digital communication system is presented in this contribution. The specialized software Xilinx System Generator (SG), a toolbox working in the MATLAB/Simulink environment, is used. The approach has been applied to the design of a Four-Dimensional 8-PSK Trellis-Coded Modulation with 2.75 bits/channel-symbol spectral efficiency, whose system specifications...
We propose a new stochastic model governing bistatic returns from GNSS-R systems. The main mechanism exploited in the model is the scattering from specular points and the fluctuations of their number. The scattering inside a delay-Doppler cell is modelled as the sum of a random number of contribution from specular points that, when the number of such contribution is large, converges to a compound-Gaussian...
We analyse the two most promising modulation formats for High Data Rate (HDR) downlink from satellite Earth Observation platform to ground stations. For these systems, we investigate their main performance and complexity in a variety of possible implementations.
A new approach is proposed for the retrieval of trace gases, vertical column concentrations, from hyperspectral satellite observations. This technique consists of a semi-blind recovery of concentrations and pure spectra from their linear mixtures. This decomposition is based on the Least Dependent component Analysis (LDA) technique, a method that generalizes the well known Independent Component Analysis,...
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