A5003428906- Synthetic Aperture Radar (SAR) Applications and Techniques
- Soil Moisture and Remote Sensing
- Advanced SAR Imaging Techniques
- Cryospheric studies and observations
- Geophysics and Gravity Measurements
- Landslides and related hazards
- Planetary Science and Exploration
- Remote Sensing and LiDAR Applications
- Climate change and permafrost
- Fire effects on ecosystems
- earthquake and tectonic studies
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Inertial Sensor and Navigation
- Aeolian processes and effects
- Flood Risk Assessment and Management
- Tropical and Extratropical Cyclones Research
- Meteorological Phenomena and Simulations
- GNSS positioning and interference
- Robotics and Sensor-Based Localization
- Precipitation Measurement and Analysis
- Ocean Waves and Remote Sensing
- Seismology and Earthquake Studies
- Seismic Imaging and Inversion Techniques
- Underwater Vehicles and Communication Systems
Jet Propulsion Laboratory
2008-2024
California Institute of Technology
2002-2021
Radar (United States)
2016
The authors have augmented the NASA DC-8 AIRSAR instrument with a pair of C-band antennas displaced across track to form an interferometer sensitive topographic variations Earth's surface. During 1991 flight campaign, data were acquired over several sites in US and Europe, maps produced from these lines. Analysis results indicate that statistical errors are 2-4-m range, while systematic effects due aircraft motion 10-20-m range. initial development second-generation processor show...
In 2015 and 2016, the AfriSAR campaign was carried out as a collaborative effort among international space National Park agencies (ESA, NASA, ONERA, DLR, ANPN AGEOS) in support of upcoming ESA BIOMASS, NASA-ISRO Synthetic Aperture Radar (NISAR) NASA Global Ecosystem Dynamics Initiative (GEDI) missions. The contribution to conducted 2016 with LVIS (Land Vegetation Ice Sensor) Lidar, L-band UAVSAR (Uninhabited Aerial Vehicle Radar). A central motivation for deployment common AGBD estimation...
It is shown that the Stokes matrices measured by an imaging radar polarimeter provide enough information for accurate phase calibration of observed polarimetric characteristics a surface. This important because it allows data to be reduced in volume operational synthetic aperture correlator with no prior knowledge conditions at surface, and end user can later select particular region where he or she comfortable making assumption regarding relative phases hh nu signals. No ground equipment...
A keystone of the Airborne Microwave Observatory Subcanopy and Subsurface (AirMOSS) investigation is P-band Synthetic Aperture Radar (SAR), which will provide calibrated polarimetric measurements that be used to retrieve root-zone soil moisture (RZSM) over regional scale (250 kha) areas imaged. The radar based on JPL's L-band Uninhabited Aerial Vehicle (UAVSAR) system. It currently under development scheduled begin flights in mid-2012. AirMOSS SAR inherits UAVSAR's existing RF digital...
The unique capabilities of imaging radar to penetrate cloud cover and collect data in darkness over large areas at high resolution makes it a key information provider for the management mitigation natural human-induced hazards. Researchers have demonstrated use UAVSAR determine flood extent, forest fire lava flow, landslide. Data latency most 2–3 h is required be disaster responders. We developed on-board processor real time autonomous operations that has fidelity accuracy enable timely...
Abstract. Permafrost-affected ecosystems of the Arctic–boreal zone in northwestern North America are undergoing profound transformation due to rapid climate change. NASA's Arctic Boreal Vulnerability Experiment (ABoVE) is investigating characteristics that make these vulnerable or resilient this ABoVE employs airborne synthetic aperture radar (SAR) as a powerful tool characterize tundra, taiga, peatlands, and fens. Here, we present an annotated guide L-band P-band SAR data acquired during...
Abstract. Snow provides critical water resources for billions of people, making the remote sensing snow equivalent (SWE) a highly prioritized endeavor, particularly given ongoing climate change impacts. Synthetic aperture radar (SAR) is promising method SWE because penetrates snow, and SAR interferometry (InSAR) can be used to estimate changes in (ΔSWE) between acquisitions. We calculated ΔSWE retrievals from 10 NASA L-band (1–2 GHz, ∼25 cm wavelength) uninhabited aerial vehicle (UAVSAR)...
Polarimetric synthetic aperture radars, operating at L-, C- and P-band, were designed to replace upgrade a system destroyed in an aircraft accident. Ground flight tests conducted, the radar was flown over calibration site sequence of experiments calibrate system. The also took part science campaigns.
The NASA/Jet Propulsion Laboratory Airborne Synthetic Aperture Radar (JPL AIRSAR) system has now completed four flight campaigns. authors describe the current state of this and provide insight into how seasons are planned for instrument. data processors products described. A table containing relevant parameters is provided.
Background The AfriSAR campaign was a joint NASA and European Space Agency airborne conducted in Gabon support of the upcoming ESA BIOMASS, NASA-ISRO Synthetic Aperture Radar (NISAR) Global Ecosystem Dynamics Initiative (GEDI) missions. aim to collect ground, SAR Lidar data for development evaluation forest structure biomass retrieval algorithms. consisted two deployments, first 2015 with ONERA SETHI system second 2016 LVIS (Land Vegetation Ice Sensor) Lidar, L-band UAVSAR DLR F-SAR. In...
Abstract. Snow provides critical water resources for billions of people, making the remote sensing snow equivalent (SWE) a highly prioritized endeavor, particularly given current and projected climate change impacts. Synthetic Aperture Radar (SAR) is promising method SWE because radar penetrates SAR interferometry (InSAR) can be used to estimate changes in (ΔSWE) between acquisitions. We calculated ΔSWE retrievals from 10 NASA L-band Uninhabited Aerial Vehicle (UAVSAR) acquisitions northern...
Rapid response to natural disasters resulting from events such as earthquakes, volcanoes, floods, and tsunamis or anthropogenically induced oil spills often requires time measured in hours days. The type of information required spans on the magnitude location damage needed by immediate teams longer scale monitor recovery efforts. Airborne radar can play an important role given its day/night all weather imaging capability coupled with unique set measurement observables millimeter level...
Abstract We use the 2017 Thomas fire and ensuing Montecito debris flow as a case study to demonstrate how application of various interferometric synthetic aperture radar postprocessing techniques can be used highlight scar major damage areas from flows. National Aeronautics Space Administration's airborne Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) L‐band polarimetric (InSAR) for this study. Results that single image highlights burn areas. Coherence pairs show flow. An...
We have mapped flooded areas in data collected by the NASA/JPL Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) using two convolutional neural network (CNN) image classifier architectures: U-Net and SegNet. Our study area was a region around Houston, TX, USA affected widespread flooding 2017 due to Hurricane Harvey. To train test classifiers, we manually labelled over 10000 segments flight lines. Both SegNet yielded higher accuracy than previous non-machine learning used as...
Abstract. Permafrost-affected ecosystems of the Arctic-boreal zone in northwestern North America are undergoing profound transformation as a result rapid climate change. NASA’s Arctic Boreal Vulnerability Experiment (ABoVE) is investigating characteristics that make these vulnerable or resilient to this ABoVE employs airborne synthetic aperture radar (SAR) powerful tool characterize tundra, taiga, peatlands, and fens. Here, we present an annotated guide L-band P-band SAR data acquired during...
AIRSAR has served as a test-bed for both imaging radar techniques and technologies over decade. In fact, the polarimetric, cross-track interferometric, along-track interferometric were all developed using AIRSAR. We present up-to-date system configuration, expected performance data accuracy in standard modes.
We are proposing to develop a miniaturized polarimetric L-band synthetic aperture radar (SAR) for repeat-pass differential interferometric measurements of deformation rapidly deforming surfaces geophysical interest such as volcanoes or earthquakes that is be flown on an unmanned aerial vehicle (UAV) minimally piloted (MPV). To support the repeat pass capability it necessary control flight track aircraft within specified 10 m tube with goal 1 m. This requires real-time GPS autopilot achieve...
The AirMOSS airborne SAR operates at UHF and produces fully polarimetric imagery [1]. radar data are used to produce Root Zone Soil Moisture (RZSM) depth profiles. absolute radiometric accuracy of the imagery, ideally better than 0.5 dB, is key retrieving RZSM, especially in wet soils where backscatter as a function soil moisture tends flatten out [2]. In this paper we assess uncertainty previously delivered data, describe method utilize Built Test (BIT) improve calibration, evaluate...
The NASA/JPL UAVSAR system was deployed to Europe in the May-June 2015 collect data support of experiments Iceland, Norway and Germany. deployment Germany focused on PolInSAR tomographic collections at Traunstein Forest Munich urban area. In addition were collected Kaufbeuren, DLR calibration site, where several surveyed corner reflectors available for imaging. We describe experiment design, present some preliminary results from these experiments.
We are developing an on-board imaging radar data processor for repeat-pass change detection and hazard management. This is the enabling technology NASA ESE to utilize radars. enables observation use of surface deformation over rapidly evolving natural hazards, both as aid scientific understanding provide timely agencies responsible management mitigation disasters. Many hazards occur periods hours days, need be sampled quickly. The new has potential save many lives millions dollars by putting...
SAR tomographic methods have proven extremely adept at measuring vegetation vertical structure a variety of wavelengths including L and P-bands [2]. Measuring the three dimensional its changes resulting from either natural or anthropogenic causes are key parameters in monitoring ecosystems. The NASA/JPL UAVSAR system has deployed to multiple sites Alaska over last several years conduct observations L-band P-band. This talk will provide brief overview experiment conducted boreal forests...
During the two space shuttle missions in 1994, Space-borne Imaging Radar-C (SIR-C) acquired several experimental datatakes: using ScanSAR mode. Same of these data have been processed into images swath wider than 200 km. Example are shown. These early results demonstrate that operation is not only feasible, but also represents a potentially useful tool for regional and global scale imaging by future SAR missions.