Articles tagged with Radio Signals
Researchers at NIST have confirmed that underground tunnels can have a frequency 'sweet spot' where signals travel several times farther than at other frequencies. The optimal frequency depends on tunnel dimensions, with a typical subway-sized tunnel finding its sweet spot in the 400 MHz to 1 GHz range.
Researchers have designed an RFID testbed that can measure hundreds of radio frequency identification tags simultaneously. The system allows for rapid testing of new antenna configurations and enables the evaluation of different signaling schemes without fabricating new chips or constructing multiple antennas.
Researchers at Purdue University's Discovery Park are developing advanced simulations to predict the behavior of miniature switches in micro-electromechanical systems (MEMS). The goal is to improve their reliability and durability for use in various applications, including national defense and civilian industries.
Millions of satellite television users in North Africa and the Middle East now have access to accurate atomic time, thanks to a custom-built time signal generator from NIST. The device provides both time data and audio reports, including Daylight Saving Time corrections and leap year warnings.
Researchers suggest that large earthquakes emit electromagnetic signals days or weeks before they strike, potentially providing early warnings. However, the scientific community needs to take notice and verify these findings.
A team of researchers crafted a working radio from a single carbon nanotube, performing four critical roles: antenna, tunable filter, amplifier, and demodulator. The tiny device could have applications in radio-controlled devices, cell phones, and other fields.
A team of researchers created the first fully functional radio from a single carbon nanotube, enabling tiny wireless communication devices. The nanotube radio works by detecting incoming radio waves and vibrating at its flexural resonance frequency to receive signals, offering a new approach to making radios.
Physicists at UC Berkeley have built the world's smallest radio using a single carbon nanotube, detecting radio signals through mechanical vibration. The nanoradio can tune in to FM broadcasts and even transmit music pieces from over a century old.
Researchers have discovered that cilia, tiny organelles on cell surfaces, transmit instructions that shape body tissues. Defective ciliary function disrupts the balance of Wnt signaling, leading to developmental errors and childhood diseases.
A wearable cardiac telemedicine system allows post-cardiac patients renewed mobility by recording periodic ECGs and transmitting them via SMS. This device can give patients a greater chance of receiving life-saving treatment within the golden hour period.
Scientists studying hawk moths discovered the Johnston's organ, a tiny structure above the antenna, senses movement and sends signals to the brain. The antennae guide the insect's body back to correct heading through a fine-tuned mechanism.
A solar flare can cause GPS signal degradation, affecting navigation systems like those used in planes and cars. Researchers discovered this effect when a graduate student accidentally detected the impact on a receiver at Arecibo Observatory.
The COSMIC satellite network measures atmospheric data daily in real time over thousands of points on Earth using GPS signals. Temperature and water vapor profiles will help meteorologists forecast storms and study long-term climate change trends.
Researchers at NASA's Goddard Space Flight Center have built an SDR test-bed to investigate and develop communication and navigation algorithms. This technology enables electronic devices to quickly change functions on demand, such as adapting a cell phone into a video camera or satellite interaction.
Researchers create laser pulses with specific shapes to produce signals with higher frequencies, enhancing image resolution and accuracy in detecting underground objects. The technique allows for precise control over radio frequencies, improving ultra-wideband communication systems.
Researchers used Doppler radar-like technique to track gas around the center of NGC 4395, measuring a mass less than a million solar masses - about 100 times smaller than others of its type. This discovery provides insight into midsize black holes and their role in galaxy formation.
Radatec's innovative sensors measure motion using microwave technology, operating at extremely high temperatures and unaffected by contaminants. The company's sensors provide real-time information about critical mechanical components, enabling operators to predict when repairs are needed and reducing maintenance costs.
University of Florida engineers have successfully installed a tiny on-chip antenna, enabling radio communication across distances of up to 16 feet. The achievement marks a significant step towards building an 'ultrasmall radio chip' for various applications, including border security and bridge monitoring.
Researchers placed modified radio transmitter modules within a high-rise before demolition and found that 10 of the 14 modules continued broadcasting after the structure was destroyed. The study aims to develop technology allowing emergency personnel to locate survivors by locking onto cell phone or radio signals in collapsed buildings.
Researchers have developed a new method to non-destructively detect moisture within wall construction using ultra wide-band radio waves. Laboratory experiments demonstrated the ability to locate moisture pockets to within one centimeter, producing detailed three-dimensional maps of wet areas.
Researchers at Cornell University are developing tiny automated sensors that can map disaster areas, detect biohazards, and report back in real-time. The sensors use biosensors to detect toxins and bacteria, communicate using low-power radio signals, and self-configure using game theory.
The US Navy is developing an all-digital radio receiver that can handle multiple simultaneous signals and reduce communication 'clutter'. The new technology, developed by HYPRES Inc., will enable seamless interoperability among different military units and systems.
Ultra-wideband technology offers advantages in communication due to its wide spectrum range. The technology allows for efficient transmission and reception of data without interference, enabling military communications to remain secure and domestic devices to achieve higher data rates.
USC researchers are testing a prototype 'e-textile' that can detect faint sounds, specifically distant vehicle movements on future battlefields. The fabric functions as a supersensitive detection array and can be deployed in various ways, such as a parachute or camouflage net.
Recent studies indicate that electronic transmitters used by off-piste skiers to locate buried victims are ineffective due to limited range and prolonged rescue times. The signals only carry up to 50 meters and professional skiers take an average of 18 minutes to reach their companions, resulting in a low survival rate.
A new smart tyre sensor system has been developed using microscopic components to monitor temperature and pressure, providing reliable and affordable tyre condition checks. The system, patented by Goodyear, is expected to improve tyre safety and reduce maintenance costs for motorists.
A team of scientists discovered that the Pioneer 10 spacecraft detected a radio signal modulation mimicking a planet's orbit around PSR B1257+12. The analysis reveals that solar rotation causes similar variations in the pulsar's radio waves, effectively simulating the planet.
SRI International will operate a 150-foot parabolic reflector antenna to test UHF communication signals from the Mars Global Surveyor spacecraft. The team will analyze received signals in real-time and send simulated signals to check the UHF link for future Mars missions.