A5013290349- Synthetic Aperture Radar (SAR) Applications and Techniques
- Advanced SAR Imaging Techniques
- Soil Moisture and Remote Sensing
- Microwave Imaging and Scattering Analysis
- Radar Systems and Signal Processing
- Geophysical Methods and Applications
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Precipitation Measurement and Analysis
- Antenna Design and Optimization
- Ocean Waves and Remote Sensing
- Sparse and Compressive Sensing Techniques
- Remote-Sensing Image Classification
- Arctic and Antarctic ice dynamics
- Optical measurement and interference techniques
- Structural Health Monitoring Techniques
- Meteorological Phenomena and Simulations
- Planetary Science and Exploration
- Seismic Imaging and Inversion Techniques
- Satellite Image Processing and Photogrammetry
- Satellite Communication Systems
- Calibration and Measurement Techniques
- Landslides and related hazards
- Remote Sensing and Land Use
- Space Satellite Systems and Control
Politecnico di Milano
2016-2025
Ingegneria dei Sistemi (Italy)
2015
Superconducting and other Innovative Materials and Devices Institute
2008
Serco (United Kingdom)
2007
Universidad Politécnica de Madrid
2002
University of Bologna
2000
In this paper, a novel (according to the authors' knowledge) type of scanning synthetic aperture radar (ScanSAR) that solves problems scalloping and azimuth-varying ambiguities is introduced. The technique employs very simple counterrotation beam in opposite direction SPOT: hence, name terrain observation with progressive scan (TOPS). After short summary characteristics ScanSAR its problems, TOPSAR, which design, limits, focusing are A example based on possible future system follows.
This paper focuses on multiimage synthetic aperture radar interferometry (InSAR) in the presence of distributed scatterers, paying particular attention to role target decorrelation estimation process. phenomenon is accounted for by splitting analysis into two steps. In first step, we estimate interferometric phases from data, whereas second use these retrieve physical parameters interest, such as line-of-sight (LOS) displacement and residual topography. both steps, make hypothesis that...
The state-of-the-art techniques have demonstrated that coherence error degrades the performance of synthetic aperture radar (SAR) interferometry (InSAR) for distributed scatterers (DSs). This article aims at fully evaluating influence on DS InSAR time-series analysis. In particular, we present a methodology to increase estimation accuracy interferometry, with emphasis spatiotemporal refinement. motive behind this is bias removal and variance mitigation sample matrix impose optimum weighting...
The appearance of new synthetic aperture radar (SAR) acquisition techniques based on opportunity sources enhances interest in bistatic geometries. In seismic data acquisition, each source is currently accompanied by up to 10 000 receivers, and the last two decades, geometry has been carefully studied scores authors. Rather then introducing focusing techniques, within first-order Born approximation (no multiple reflections), acquisitions are transformed into monostatic ones using a simple...
In this letter, we face one of the main issues in ground-based radar applications, i.e., evaluation and removal atmospheric phase screen (APS). The time-varying delay statistics are assessed by means both radars meteo simulated data sets critically interpreted with particular reference to entailed compensation issues. A approach based on available on-site parameters (pressure, temperature, humidity) is then investigated. technique proposes an initial calibration step humidity which leads...
In this paper, a geosynchronous synthetic aperture radar (SAR) (GEOSAR) mission for atmospheric phase screen (APS) retrieval using long coherent integration of pulses is analyzed. The nearly fixed position the platforms makes GEOSAR systems suitable continuous monitoring applications. However, moderate transmitted powers and antenna sizes, very times up to hours are required. GEOSAR, two-way propagation signals can decorrelate significantly due changes during data take, resulting in an APS...
In this paper, the performance of a nearly zero inclination and low eccentricity geosynchronous synthetic aperture radar (GEOSAR) mission for midlatitude (30°-60°) Earth observation is analyzed. The slow motion such satellites with respect to Earth's surface makes it necessary consider long coherent combination pulses during hours reach desired along-track resolution. A system based on moderate transmitted powers antenna sizes considered. sensitivity in GEOSAR obtained from accumulated...
The Advanced Radar Geosynchronous Observation System is proposed to be a multiple-input-multiple-output synthetic aperture radar (SAR) system hosted on swarm of minisatellites in quasi-geostationary orbits.The made N iso-frequency sensors, each them transmitting and receiving the signals.The would combine continuous imaging capabilities geostationary SAR, gaining factor 2 signalto-noise ratio (SNR).The real achievable ∼40 min, enabling applications so far unseen, such as monitoring fast...
The evolution of Advanced Driver Assistance Systems (ADAS) towards the ultimate goal autonomous driving relies on a conspicuous number sensors, to perform wide range operations, from parking assistance emergency braking and environment mapping for target recognition/classification. Low-cost Mass-Market Radars (MMRs) are today widely used object detection at various ranges (up 250 meters) but they might not be suited high-precision mapping. In this context, vehicular Synthetic Aperture Radar...
In this paper, we discuss the possibility of generating high-resolution mapping urban (or extra-urban) environments by application synthetic aperture radar (SAR) processing concepts to data collected mm-wave automotive radars installed on-board commercial vehicles. The study is motivated fact that sensors are becoming an indispensable component equipment modern vehicles, being characterized low cost, good performance, and affordable processing; therefore, in future, nearly every single...
A synthetic aperture radar (SAR) is considered, located on a geosynchronous receiver, and illuminated by the backscattered energy of satellite broadcast digital audio or television signals. The principal application such passive system could be differential interferometry, since even low spatial resolution coupled to zero baseline would useful; however, other imaging applications envisaged some topographic capabilities if created ellipticizing receiver's orbit. Spatial resolution, link...
The authors discuss an efficient phase preserving technique for ScanSAR focusing, used to obtain images suitable interferometry. Given two complex focused of the same area, interferogram can be generated as conventional repeat pass SAR However, due nonstationary azimuth spectrum images, coherence interferometric pair and resolution are affected, both by possible scan misregistration between passes terrain slopes along azimuth. resulting decorrelation significantly reduced means varying...
We introduce an innovative algorithm that is capable of suppression strong azimuth ambiguities in single-look complex (SLC) synthetic aperture radar images, to be used both for detected products and interferometric surveys. The exploits a band-pass filter select portion the spectrum less influenced by aliasing, one corresponds nulls replicated antenna pattern. selectivity this adapts locally depending on estimated ambiguity intensity: more selective presence becomes all-pass absence...
This letter focuses on the performance achievable by spaceborne synthetic aperture radar interferometry (InSAR) in estimation of line-of-sight crustal deformations from acquisitions over a distributed scatterer. Our model is suited for exploiting hybrid Cramer-Rao bound (HCRB), where unknowns are both deterministic parameters and stochastic variables. We take into account target decorrelation atmospheric phase screen (APS). approach leads to viable evaluation InSAR as function system...
The Mediterranean region is frequently struck by severe rainfall events causing numerous casualties and several million euros of damages every year. Thus, improving the forecast accuracy a fundamental goal to limit social economic damages. Numerical Weather Prediction (NWP) models are currently able produce forecasts at km scale grid spacing but unreliable surface information poor knowledge initial state atmosphere may inaccurate simulations weather phenomena. STEAM (SaTellite Earth...
With the advent of self-driving vehicles, autonomous driving systems will have to rely on a vast number heterogeneous sensors perform dynamic perception surrounding environment. Synthetic Aperture Radar (SAR) increase resolution conventional mass-market radars by exploiting vehicle's ego-motion, requiring very accurate knowledge trajectory, usually not compatible with automotive-grade navigation systems. In this setting, radar data are typically used refine navigation-based trajectory...
Usual coherence estimation in SAR interferometry is a time consuming task since an accurate of the local frequency interferometric fringes required. This paper presents fast algorithm for generating maps, mainly intended data browsing. The proposed estimator based on speckle similarity coherent data, and thus independent fringe frequency. following advantages, with respect to usual estimates, are achieved: (a) more than 100 times faster, achieved at cost reduced statistical confidence. (b)...
A technique to provide interferometry by combining multiple images of the same area is proposed. This exploits all jointly and performs an optimal spectral shift pre-processing remove most decorrelation for distributed targets. Its applications are mainly DEM generation at centimetric accuracy, differential interferometry. The major requirement that targets coherent over images: this may be case current multi-pass desert areas, or better coming from future short revisit time systems...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper is meant to present a statistical analysis of the role propagation disturbances (PDs), such as those due atmospheric or residual platform motion, in multibaseline synthetic aperture radar (SAR) interferometry (InSAR) and tomography (T-SAR) applications. The will consider both pointlike distributed targets way cover all cases that are relevant In order provide tool for evaluation impact...
This paper focuses on the detection, from a stack of repeated-pass interferometric synthetic aperture radar (SAR) images, such changes causing target to completely lose correlation between one epoch and another. can be consequence human activities, as construction, destruction, agricultural also hazards, earthquake, landslides, or flooding, buildings terrains. The millimetric sensitivity SAR makes it valuable for detecting changes. approaches two coherent change detection methods: space...
Approximately, 30% of the Sentinel-1 (S-1) swath over land is imaged with incidence angles higher than 40°. Still, interplay among scattering mechanisms taking place at such a high and their implications on backscatter information content often disregarded. This article investigates, through an experimental numerical study, S-1 sensitivity to surface soil moisture (SSM) agricultural fields observed low (~33°) (~43°) quantifies impact angle SSM retrieval accuracy. The study sites are Apulian...
The paper analyses an along-track multistatic Synthetic Aperture Radar (SAR) formation. formation aims at achieving a high azimuth resolution maintaining the same time large swath width. case with one transmitting sensor and all receiving is analyzed (Single Input Multiple Output, SIMO). An effective novel reconstruction, in two-dimensional frequency domain introduced that able to keep low ambiguity achieve recombination gain close theoretical one. Degradation of system performance due loss...