Articles tagged with Radar
A team led by Virginia Tech's Manoochehr Shirzaei has developed high-resolution digital maps to monitor land subsidence and sea-level rise, revealing vulnerable areas along the Atlantic East Coast. The data supports flood risk management and informs climate change projections, helping to refine models for hurricanes and storms.
Researchers have developed a new method to monitor shore ice using portable interferometric radar, which can detect small changes in the ice's distance and reveal signs of instability. This system can provide an early warning for humans working on shorefast sea ice and also aid in near-coastal navigation.
Researchers attribute unusual radar properties to coherent backscatter opposition effect (CBOE) and ice surface irregularities. The CBOE model, improved by Hofgartner and Hand, can explain all icy satellite radar properties.
Researchers used a 3D radar scan to reveal that Malaspina Glacier is undercut by channels, making it more vulnerable to melting and potentially contributing significantly to global sea level rise. The glacier's bulk sits below sea level, and its coastal barrier erodes, allowing ocean water to access the glacier and accelerate its retreat.
Researchers from USTC developed a novel method combining micro/nano resolution with deep sub-wavelength localization to achieve quantum-enhanced position measurement accuracy of 10^-4 wavelengths. This breakthrough technology enables high-precision microwave positioning, surpassing traditional radar systems.
Researchers have found that honeybees use linear landscape elements, such as irrigation channels, to guide their search flights when looking for their hive in new areas. The bees retain a navigational memory of their home area based on these elements, which they generalize to the new area to find their way home.
Researchers at Chalmers University of Technology developed a method to predict fall accidents and cognitive illnesses like Alzheimer's disease using radar sensors that track walking patterns. The technology can help healthcare staff make more reliable risk assessments and tailor interventions for improved patient outcomes.
A new study using satellite images found that glaciers on the Antarctic Peninsula are flowing up to 22% faster during summer months due to warmer ocean waters and melting snow. This speed-up, driven by reduced friction between ice sheets and underlying rock, poses a significant threat to global sea levels.
The Zhurong rover has imaged shallow impact craters and buried impact crater walls in the top five meters of Mars' surface, revealing complex subsurface geology. Researchers found layers of sediment left by past flooding and deposition, but no evidence of water or ice in the present day.
A new study provides insights into the conservation of eastern US migratory landbirds by identifying key stopover hotspots and habitat associations. The researchers found that small pockets of deciduous forest, particularly in areas with high concentrations of food and shelter, are crucial for birds to complete their migration.
Jay W. McDaniel, assistant professor at the University of Oklahoma, receives a CAREER Award to develop a custom UAV-based radar suite for measuring snow depth and distribution. The project aims to improve understanding of snow characteristics and their impact on thermal balance between terrain and atmosphere.
A new study uses drone-mounted technology to deter bats from flying into wind turbines, reducing fatalities by 40% and allowing turbines to operate efficiently. The device transmits ultrasonic signals and lights to warn bats of danger, leading them to fly over the turbine and out of harm's way.
Researchers at CReSIS have developed an adaptable radar system for unmanned aerial systems, enabling more complete data on ice-sheet thickness. The new system will improve ice-discharge estimates and allow routine monitoring of sea ice snow cover.
A new space-time coding antenna developed at City University of Hong Kong enables manipulation of beam direction, frequency, and amplitude for improved user flexibility in 6G wireless communications. The antenna relies on software control and combines research advances in leaky-wave antennas and space-time coding techniques.
Researchers used high-resolution radar systems to reconstruct past ice streams in Greenland, revealing they can 'shut down' rapidly. This insight offers new information on the future behavior of ice streams and how it affects sea-level rise predictions.
Great gray owls have a broad disc-like face that acts as radar to find food, while their facial features help correct for sonic distortions caused by snow. The owls' ability to hover above prey allows them to pinpoint location and avoid acoustic mirages created by the snow.
Researchers used satellites with radar imaging sensors to map flooding and assess flood impacts in Queensland. The technique combines images from optical satellites with information from imaging radar satellites, providing faster update times and more accurate data.
Researchers used weather radar to track bird movements and found peak roosting stages shifting earlier due to warmer temperatures. This shift may lead to a shortened pre-migratory season, impacting birds' survival during migration.
The study includes 191 asteroids' radar cross sections and Doppler-frequency broadening, offering clues to asteroids' spin periods and sizes. The research also discovered two metal-rich near-Earth asteroids and five possible enstatite-rich asteroids, shedding new light on the formation and evolution of the solar system.
The researchers designed and fabricated three different paper-based metamaterials using their new technique, including a polarization converter, an absorber, and a conformal coding metasurface. These materials demonstrated unique properties such as high conductivity and radar cross-section reduction.
Cornell researchers have helped NASA's Dragonfly mission prepare for a smooth landing on Saturn's moon Titan by analyzing radar images of the Selk crater region. The team characterized the landscape, gauging the rim height of the crater and understanding its geology.
A team of international scientists found that many densely populated coastal cities worldwide are at risk from sea level rise due to land subsidence. The study used satellite images to estimate the rate of land sinking in 48 cities, with median speeds ranging from 16.2mm/year to 43mm/year.
Researchers in Japan have demonstrated that incorporating radar data from the Antarctic Syowa Station enhances atmospheric parameter reproducibility, improving mid-latitude cyclone forecasts. This sustainable approach reduces environmental waste and error uncertainty.
The University of Arizona professor is working with biomedical experts to explore the feasibility of using mmWave radar technology on falling detection and fall risk analysis. The NIH award supports a three-year study to investigate how well the technology can estimate fall risks, determine falls, and be accepted by senior citizens.
A new study suggests Europa's ice shell could be orders of magnitude purer than previously thought due to the formation of frazil ice, which keeps salt in seawater. This could affect the ice's strength and heat transfer, making it crucial for understanding Europa's habitability.
A recent study combined elevation data of the Antarctic ice sheet from two different satellites, CryoSat-2 and Sentinel-3, to obtain a more accurate map of latest elevation changes. The results showed that the average elevation of the ice sheets had decreased at a rate of 4.3 cm/year during 2016-2019.
Researchers used marine monitor radar system to track vessel activity near California's marine protected areas. The study found that 40% more boat activity occurred in the vicinity of MPAs compared to surrounding areas, suggesting fishers are aware of MPA boundaries and cluster just outside them for better fishing opportunities.
A team led by Professor Song Min Kim developed a system that can support concurrent communications for tens of millions of IoT devices using backscattering millimeter-level waves. The system offers internet connectivity on a mass scale to IoT devices at a low installation cost.
Researchers analyzed data from Ka-band radar and satellite observations to study the effects of cloud seeding on mixed convective-stratiform clouds. The study found that the convective region responds with larger precipitation particles, while the stratiform region experiences icing seeding tracks due to faster ice crystal formation.
Researchers discovered a vast network of ultrasonic signals among moths, revealing complex acoustic mimicry rings. These sounds may be used by moths to evade bats and are found in many species beyond previously known tiger and hawk moths.
Researchers used weather radar data to identify areas where large numbers of migrating birds fly through the rotor-swept zone and stopover in high densities. This information can guide the placement of new wind energy development and turbine operation to minimize collisions and habitat loss.
A severe rainstorm over Kauai in April 2018 resulted in $180 million in damage and 532 homes destroyed. The study found that supercell thunderstorms triggered the deluge, which set a new US 24-hour rainfall record of nearly 50 inches.
Researchers find evidence of water pockets beneath the icy surface of Europa, which could facilitate exchange between the subsurface ocean and nutrients from neighboring celestial bodies. The discovery suggests a dynamic ice shell that supports habitability on the Jupiter moon.
Researchers at UToledo validated geoelectrical methods for detecting anomalies related to disturbed ground and human decay. Ground-penetrating radar showed stronger signals for mass graves than individual ones.
Researchers at Duke University have demonstrated a new attack strategy that can deceive industry-standard autonomous vehicle sensors into believing nearby objects are closer or further than they appear. This vulnerability highlights the need for additional redundancy and data sharing between vehicles to protect against such attacks.
A new study using advanced radar technology has recorded Antarctic glaciers losing ice at unprecedented rates, threatening global climate risks. The research team plans to expand its findings to giant and fragile West Antarctica neighbors, including the Thwaites and Pine Island glaciers.
Geosapiens receives major funding from the Canadian Space Agency to develop innovative approaches to flood mapping. The project aims to integrate satellite imagery data for real-time flood zone identification and risk assessment.
A symmetrical, 2x3 km buried formation in Qatar suggests evidence of a sedentary civilization with advanced engineering skills. The site's unique soil composition and landscaping point to irrigation systems and crop cultivation.
A recent study led by the University of Texas at Austin has found that liquid water detected under Mars' ice-covered south pole is likely a dusty mirage. However, the researchers suggest that ancient lakes and riverbeds may still be present on the planet, offering clues about its wetter past.
Researchers have compiled a comprehensive directory of subglacial lakes worldwide, revealing that 20% are active and pose a hazard to human populations. The inventory provides a knowledge base for scientists to assess future changes as the climate warms.
A new neural net technique combines optical imaging and synthetic-aperture radar to provide a single comprehensive data source, enhancing disaster response capabilities. The approach achieves up to a 96% accuracy rate in detecting objects and can be applied to various tasks such as crop health monitoring and building identification.
Researchers have developed a high-resolution radar sensor that can reliably distinguish between cars and pedestrians, providing counts, speed, and direction of each moving target. The sensor outperforms cameras in low-visibility conditions and beats conventional radar by providing a richer picture.
Researchers found that stronger hurricanes trap and transport more birds due to their intense winds and thunderstorms. The study used radar data from 33 Atlantic hurricanes between 2011 and 2020, revealing a correlation between hurricane intensity and the presence of birds within the eye.
A new model developed by Skoltech researchers optimizes satellite radar system design, balancing performance characteristics with other mission parameters. The study identifies optimal designs for small satellite platforms, particularly in the 8-12 GHz and 4-8 GHz frequency bands.
Researchers from the University of Cambridge have created a real-time approach to predict drone flight paths and intentions, enabling safer use of drones. The solution uses statistical techniques and radar data to identify potential threats before they enter restricted airspace.
Researchers combined VOD with remote sensing data from optical satellites to analyze the effects of fire on Amazon canopy dynamics. The study found that VOD provided a more accurate picture of photosynthetic and non-photosynthetic biomass changes, and that rainfall was close to average during the fire season.
Researchers from NUST MISIS and international partners create a radar-absorbing polymer composite with excellent magnetic and microwave properties. The composite can absorb 99.9% of incoming electromagnetic radiation, making it suitable for EMI shielding applications in industries such as 5G networks and radar absorbing coatings.
A new study published in Geophysical Research Letters suggests that smectites, a type of clay, are the most likely explanation for the bright radar reflections discovered at Mars' south polar cap. The research team used multiple lines of evidence to demonstrate that clays can explain all observations, putting the lake hypothesis on ice.
The Dead Sea is shrinking at a rate of about one meter per year, causing land subsidence of 15 centimeters annually. Researchers have linked this trend to hydro-meteorological fluctuations, revealing a direct connection between water table fluctuations, evaporation, and land movement.
A miniature radar device, MAPrad, can scan almost twice as deeply below ground as existing technology, identifying minerals, ice deposits, and voids like lava tubes. The device will be tested at the Undara caves in Australia to map one of Earth's largest accessible systems of lava tubes.
Researchers at TUM have conducted comprehensive measurements of sea level rises in the Baltic Sea and North Sea with millimeter accuracy. The new method provides reliable forecasts on sea level trends, enabling planning of protective measures such as flood protection structures.
Researchers have successfully detected groundwater beneath Hiawatha Glacier in Greenland using airborne ice-penetrating radar. The discovery could greatly impact sea-level rise projections by enabling the study of water flow through ice sheets at a continental scale.
Scientists tracked individual honeybee drones using radar technology, revealing their mating behaviors and finding that they move between multiple congregation areas during a single flight. This discovery suggests the existence of a new type of animal mating system in honeybees.
Researchers have pinned down the precise length of a day on Venus, the tilt of its axis and the size of its core. The new measurements reveal an average day on Venus lasts 243.0226 Earth days, roughly two-thirds of an Earth year, with variations in rotation rate due to the planet's heavy atmosphere.
A new study reveals inconsistencies between satellite and ground-based radar data on cloud top height, highlighting the importance of surface temperature in these discrepancies. The Tibet Plateau proved an ideal location for this research, providing high elevation and sparse weather reporting stations.,
A revised position for primary strand of the Pleistocene-Holocene San Andreas Fault in Southern California suggests a previously overlooked strand poses a significant earthquake threat. The Mission Creek strand accounts for nearly its entire slip rate, indicating it may be the primary Pacific-North American plate boundary fault at this...
Researchers at the Arecibo Observatory have developed a technique to analyze radar signals bounced off asteroids' surfaces, providing crucial information on their physical properties. This method can help planetary defense prepare for asteroids on a collision course with Earth by identifying porous, fluffy, or rocky surfaces.
Researchers at Penn State developed micro-Doppler radars that can accurately classify human gait patterns with greater than 90% accuracy. This technology has the potential to prevent falls and disabilities, detect Parkinson's and dementia, diagnose concussions, and identify musculoskeletal injury risk factors.
Researchers found that radar overestimates precipitation rates when partially frozen droplets are larger than their solid and liquid counterparts. The phenomenon, known as reflectivity maxima above freezing (RMAF), is more common on windward slopes of mountain ranges.
New research links the shape and size of precipitation areas on radar to rainfall intensity. Studies in the Tibetan Plateau show that square-shaped precipitation areas have the highest rain rate, while linear ones have the lowest. This discovery has potential for forecasting precipitation and verifying numerical models.