59 Sentences With "extremely high frequency"

One is that it's using mmWave, which are extremely high-frequency radio waves that allow for high precision.

These are extremely high-frequency radio waves capable of transmitting large amounts of data in relatively small, dense chunks of signal.

But the most distinctive innovation of 5G will be its reliance, for the first time, on extremely high-frequency millimeter wave spectrum bands.

The latest airport body scanner machines detect hidden objects with extremely high frequency radiation known as millimeter waves, which bounce off things they strike.

The satellite, code-named AEHF-5 (for the fifth "Advanced Extremely High Frequency" spacecraft) is already communicating with USAF on the ground, indicating full mission success.

The Lockheed Martin-built Advanced Extremely High Frequency (AEHF) satellite is one of six in a constellation upgrade to the Air Force Space and Missile Systems Centers older Milstar network.

The Lockheed Martin-built Advanced Extremely High Frequency (AEHF) satellite is one of six in a constellation upgrade to the Air Force Space and Missile Systems Center's older Milstar network.

The radio waves in the extremely high frequency band have 53-10 millimeter wavelengths (versus tens of centimeters in the lower range where 4G lives), so they're also called "millimeter-wave" frequencies.

The B-2 Flight Management Control Processor Upgrade, also known as the Extremely High Frequency, Increment 1 processor upgrade, completed the final aircraft install in August 2016, Air Force officials told Warrior Maven last year.

Airmen from the 22nd Airlift Squadron at Travis Air Force Base in California prepare a C-5C Galaxy to be loaded with an Advanced Extremely High Frequency satellite, which allows for jam resistant-communication, April 19, 2019.

This is the sixth Advanced Extremely High Frequency (AEHF) satellite being launched for the military, but the previous five have all been deployed under the U.S. Air Force because the Space Force only came into existence officially last year.

To support the demand for gigabit speeds and mounting data use, we'll have to grab bandwidth from higher up in the electromagnetic spectrum, pushing up into the "extremely high frequency" range at 30-300 GHz—wedged right between microwaves and infrared light.

The payload today was the sixth Advanced Extremely High Frequency (AEHF) satellite that has been deployed for U.S. defense customers, though the original five that are already in orbit (which launched over the course of the past decade) were obviously sent up before Space Force was officially formed.

While the X-37B typically carries a secretive payload, the Air Force was a bit more forthcoming this time, saying that it would carry out tests of a new thruster system designed for use onboard the military's Advanced Extremely High Frequency satellites, 10 CubeSats for the Planetary Society, as well as "dozens of material samples," for NASA, to test how well they'll fare in space.

Prior to 1900, Tesla experimented with industrial nitrogen fixation "by using currents of extremely high frequency or rate of vibration".

Genetic studies suggest that the extremely high frequency patterns in some European countries are the result of migrations of Vikings and later Normans, indicating a genetic link between hereditary hemochromatosis and Viking ancestry.

USA-214, known before launch as Advanced Extremely High Frequency 1 or AEHF SV-1, is a military communications satellite operated by the United States Air Force. It is the first of four spacecraft to be launched as part of the Advanced Extremely High Frequency program, which will replace the earlier Milstar system. The USA-214 spacecraft was constructed by Lockheed Martin, and is based on the A2100 satellite bus. The spacecraft has a mass of and a design life of 14 years.

It will be used to provide super high frequency and extremely high frequency communications for the armed forces of the United States, as well as those of the United Kingdom, the Netherlands, and Canada.

Low intensity (usually 10 mW/cm2 or less) electromagnetic radiation of extremely high frequency may be used in human medicine for the treatment of diseases. For example, "A brief, low-intensity MMW exposure can change cell growth and proliferation rates, activity of enzymes, state of cell genetic apparatus, function of excitable membranes and peripheral receptors." This treatment is particularly associated with the range of 40 – 70 GHz. This type of treatment may be called millimeter wave (MMW) therapy or extremely high frequency (EHF) therapy.

In September 2020, Northrop Grumman won a $298 million sole-source contract for the Evolved Strategic Satcom program, an anti-jam communications satellite program intended to replace the Advanced Extremely High Frequency (AEHF) satellite program where Northrop Grumman was a subcontractor to Lockheed Martin.

Sun Zhongliang (; 26 August 1936 – 29 June 2019) was a Chinese electrical engineer and professor at Southeast University who specialized in extremely high frequency research. He was an academician of the Chinese Academy of Engineering and a recipient of the State Science and Technology Progress Award (First Class).

Marconi later transmitted the wireless signals across the Atlantic between Poldhu, Cornwall, and St. John's, Newfoundland, a distance of .Marconi's biography at Nobelprize.org retrieved 21 June 2008. Millimetre wave communication was first investigated by Jagadish Chandra Bose during 18941896, when he reached an extremely high frequency of up to 60GHz in his experiments.

Makes use of a rod extending up into the firing chamber and resting against the base of a chambered ball. The rod is oscillated at an extremely high frequency (imperceptible to humans) by a crystal on the control board, and when a ball falls into the chamber and hits the rod, the oscillation is affected, allowing the marker to detect when the ball is fully chambered.

Sun was born on 26 August 1936 in Shanghai, Republic of China. He tested into the Department of Radio Engineering of Nanjing Institute of Technology (now Southeast University) in 1955, and was hired by the university as a faculty member upon graduation in 1960. He became an associate professor in 1983 and full professor in 1987. Sun was a renowned expert in the field of extremely high frequency (EHF).

Advanced Extremely High Frequency (AEHF) is a series of communications satellites operated by the United States Space Force. They will be used to relay secure communications for the Armed Forces of the United States, the British Armed Forces, the Canadian Armed Forces, the Royal Netherlands Armed Forces and the Australian Defence Force. The system will consist of six satellites in geostationary orbits. The final satellite was launched on 26 March 2020.

The toothed whales are also unusual in that the ears are separated from the skull and placed well apart, which assists them with localizing sounds, an important element for echolocation. Studies have found there to be two different types of cochlea in the dolphin population. Type I has been found in the Amazon river dolphin and harbour porpoises. These types of dolphin use extremely high frequency signals for echolocation.

The MoD has become a user of U.S. military constellations Advanced Extremely High Frequency and the Wideband Global Satcom systems, and may become a partner in the Mobile User Objective System. Part of the enhanced capability would be to support data links to unmanned aerial vehicles and F-35B Lightning II aircraft. As of December 2019, the MoD was processing requests for information from potential bidders to operate the ground stations for Skynet 6.

Millimetre wave communication was first investigated by Bengali physicist Jagadish Chandra Bose during 18941896, when he reached an extremely high frequency of up to 60GHz in his experiments. He also introduced the use of semiconductor junctions to detect radio waves, reprinted in Igor Grigorov, Ed., Antentop, Vol. 2, No.3, pp. 87–96. when he patented the radio crystal detector in 1901. In 1924, Japanese engineer Kenjiro Takayanagi began a research program on electronic television.

MESFETs are usually constructed in compound semiconductor technologies lacking high quality surface passivation, such as gallium arsenide, indium phosphide, or silicon carbide, and are faster but more expensive than silicon-based JFETs or MOSFETs. Production MESFETs are operated up to approximately 45 GHz, and are commonly used for microwave frequency communications and radar. The first MESFETs were developed in 1966, and a year later their extremely high frequency RF microwave performance was demonstrated.GaAs FET MESFET radio-electronics.com.

An Advanced Extremely High Frequency communications orion satellite centre relays secure communications for the United States and other allied countries. A communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military applications. There are about 2,000 communications satellites in Earth's orbit, used by both private and government organizations.

The United States Air Force's 4th Space Operations Squadron is a satellite operations unit located at Schriever AFB, Colorado. 4 SOPS is responsible for command and control of the Milstar/Advanced Extremely High Frequency, Defense Satellite Communications System Phase III, and Wideband Global SATCOM satellite constellations. The 4th Space Operations Squadron's mission is to operate the Air Force's protected and wideband MILSATCOM systems. They provide warfighters global, secure, survivable, strategic and tactical communication during peacetime and throughout the full spectrum of conflict.

The USDC is driven by a Piezoelectric stack actuator that creates the vibrations. The actuator vibrates at an extremely high frequency, making it ultrasonic, and it is these waves of vibration that are transmitted by the horn of the actuator all the way to the bit itself. The vibrations are created at the actuator and are transferred by the horn to a free mass. The free mass vibrates between the drill stem and the horn of the actuator to transmit the vibrations down the drill stem.

The dryness of the air around and above Mount Graham is important for extremely high frequency (EHF) radio and far-infrared observations - a region of the spectrum where the electromagnetic waves are strongly attenuated by any water vapor or clouds in the air. This telescope is used nine to ten months of the year, and it is stowed only when there is too much water vapor in the atmosphere, primarily during the summertime. This telescope is one of the telescopes that makes up Mount Graham International Observatory.

Nikolay Devyatkov with colleagues developed the theoretical foundations of low-intensity millimeter waves therapy (MM-wave Therapy) also called Extremely High Frequency (EHF) Therapy.Devyatkov ND, Golant MB, Betsky OV. Millimeter waves and their role in the processes of life. - Moscow: Radio and Syaz, 1991. Devyatkov ND, Golant MB, Betsky OV. Brief information for physicians about the physical characteristics of the processes occurring in the body under MM-wave therapy performed by installations "Jav-1", and the associated effects on the body of electromagnetic millimeter waves.

At different bias voltages the carriers are redistributed and the distance between the carriers on each side of the barrier (B) is different. As a consequence the HBV has electrical properties resembling the parallel plate capacitor with a voltage dependent plate distance d. The main application for the HBV diode is to generate extremely high frequency signals from lower frequency input. This type of frequency multiplication is demonstrated as triplers (3× multiplication) at 100 GHz"A 0.2-W heterostructure barrier varactor frequency tripler at 113 GHz," Vukusic et.

The Raisting Satellite Earth Station is the largest satellite communications facility in Germany. A ground station, earth station, or earth terminal is a terrestrial radio station designed for extraplanetary telecommunication with spacecraft (constituting part of the ground segment of the spacecraft system), or reception of radio waves from astronomical radio sources. Ground stations may be located either on the surface of the Earth, or in its atmosphere. Earth stations communicate with spacecraft by transmitting and receiving radio waves in the super high frequency or extremely high frequency bands (e.g.

The DISA PDA-184 software application implements a fully compliant MIL- STD-188-184A data controller. It provides reliable data communications over noisy, low bandwidth channels to support chat, file transfer, and email services via an easy-to-use graphical user interface. The application supports multiple bands and waveforms, including integrated waveform (IW), legacy ultra-high frequency (UHF) satellite communications (SATCOM), UHF line of sight (LOS), very high frequency (VHF), high frequency (HF), and extremely high frequency (EHF) SATCOM. PDA-184 is provided without charge to all combatant commands (CCMDs) / services / agencies (CC/S/A).

The noise and signal variation component of the two signals is substantially the same and is therefore eliminated from the resulting difference signal. An antenna control unit utilizes the resulting difference signal to select the optimum signal strength for the particular step of the search pattern. This system is particularly applicable to extremely high frequency communication channels (86 GHz and above) which are subject to atmospheric distortion and noise. Antenna Tracking Systems can apply to Broadband and Microwave Radio Systems as well for Point- to-Point and Point-to-Multipoint communications.

Starting in 1894, Italian inventor Guglielmo Marconi began developing a wireless communication using the then newly discovered phenomenon of radio waves, showing by 1901 that they could be transmitted across the Atlantic Ocean.Tesla Biography, Ljubo Vujovic, Tesla Memorial Society of New York, 1998. This was the start of wireless telegraphy by radio. Voice and music were demonstrated in 1900 and 1906, but had little early success. Millimetre wave communication was first investigated by Bengali physicist Jagadish Chandra Bose during 18941896, when he reached an extremely high frequency of up to 60GHz in his experiments.

There was discontinuity between mesolithic central Europe and modern European populations mainly due to an extremely high frequency of haplogroup U (particularly U5) types in mesolithic central European sites. The existence of an especially strong genetic association between the Irish and the Basques was first challenged in 2005, and in 2007 scientists began looking at the possibility of a more recent Mesolithic- or even Neolithic-era entrance of R1b into Europe. A new study published in 2010 by Balaresque et al. implies either a Mesolithic- or Neolithic- (not Paleolithic-) era entrance of R1b into Europe.

Example of waveguides and a diplexer in an air traffic control radar Depending on the frequency, waveguides can be constructed from either conductive or dielectric materials. Generally, the lower the frequency to be passed the larger the waveguide is. For example, the natural waveguide the earth forms given by the dimensions between the conductive ionosphere and the ground as well as the circumference at the median altitude of the Earth is resonant at 7.83 Hz. This is known as Schumann resonance. On the other hand, waveguides used in extremely high frequency (EHF) communications can be less than a millimeter in width.

Then, to manage the outliers, they augmented the small (i.e. low port density) network switches, commonly referred to as top-of-the-rack or ToR switches, which connect the server racks to the rest of the network, with extremely high frequency point-to-point radio frequency links. Notwithstanding concerns about link reliability due to interference, they used these short range, highly directional links advantageously, exploiting frequency_reuse to light-up many links concurrently and interference-free at multi-Gbps rates. The steerable radio beams provided additional inter-rack capacity on an as needed bases thus relieving congestion hot-spots.

Band V (meaning Band 5) is the name of a radio frequency range within the ultra high frequency part of the electromagnetic spectrum. It is not to be confused with the V band in the extremely high frequency part of the spectrum. Sources differ on the exact frequency range of UHF Band V. For example, the Broadcast engineer's reference book and the BBC define the range as 614 to 854 MHz. The IPTV India Forum define the range as 582 to 806 MHz and the DVB Worldwide website refers to the range as 585 to 806 MHz.

Summation or integration of the spectral components yields the total power (for a physical process) or variance (in a statistical process), identical to what would be obtained by integrating x^2(t) over the time domain, as dictated by Parseval's theorem. The spectrum of a physical process x(t) often contains essential information about the nature of x. For instance, the pitch and timbre of a musical instrument are immediately determined from a spectral analysis. The color of a light source is determined by the spectrum of the electromagnetic wave's electric field E(t) as it fluctuates at an extremely high frequency.

New York: D. Van Nostrand and further additions to the field by Édouard Branly, Nikola Tesla, Oliver Lodge, Jagadish Chandra Bose, and Ferdinand Braun. In 1896, Guglielmo Marconi went on to develop the first practical and widely used radio wave based communication system.Bryan H. Bunch/Alexander Hellemans The History of Science and Technology, p. 436, Houghton Mifflin Harcourt, 2004 Wireless TelegraphyProceedings of the Institute of Radio Engineers pp. 101-5 Millimetre wave communication was first investigated by Jagadish Chandra Bose during 18941896, when he reached an extremely high frequency of up to 60GHz in his experiments.

OTV-4 stationary at the Shuttle Landing Facility The fourth X-37B mission, OTV-4, was codenamed AFSPC-5 and designated as USA-261 in orbit. It was the second flight of the second X-37B vehicle. The X-37B launched on an Atlas V rocket from Cape Canaveral SLC-41 on 20 May 2015 at 15:05 UTC. Objectives included a test of Aerojet Rocketdyne's XR-5A Hall-effect thruster in support of the Advanced Extremely High Frequency communications satellite program, and a NASA investigation on the performance of various materials in space for at least 200 days.

Jagadish Chandra Bose in 1894 Charles Proteus Steinmetz circa 1915 During the development of radio, many scientists and inventors contributed to radio technology and electronics. In his classic UHF experiments of 1888, Heinrich Hertz demonstrated the existence of electromagnetic waves (radio waves) leading many inventors and scientists to try to adapt them to commercial applications, such as Guglielmo Marconi (1895) and Alexander Popov (1896). Millimetre wave communication was first investigated by Jagadish Chandra Bose during 18941896, when he reached an extremely high frequency of up to 60GHz in his experiments. He also introduced the use of semiconductor junctions to detect radio waves, reprinted in Igor Grigorov, Ed., Antentop, Vol.

Extremely high frequency (EHF) is the International Telecommunication Union (ITU) designation for the band of radio frequencies in the electromagnetic spectrum from 30 to 300 gigahertz (GHz). It lies between the super high frequency band, and the far infrared band, the lower part of which is the terahertz band. Radio waves in this band have wavelengths from ten to one millimetre, so it is also called the millimetre band and radiation in this band is called millimetre waves, sometimes abbreviated MMW or mmWave. Millimetre-length electromagnetic waves were first investigated by Indian physicist Jagadish Chandra Bose during 18941896, when he reached up to 60GHz in his experiments.

Since the IGBTs switch on and off at a regulated cycle rate, a generator can be slightly off-speed and the lamp will still be flicker-free, which is not the case with a standard magnetic ballast. The square wave nature of the output results in a straight-line power output from the lamp. The time where cathodes aren't emitting electrons of high enough energy is very short, meaning that safe (flicker-free) filming can occur at camera framerates up to 10,000 frame/s on most electronic ballasts. Unfortunately, this very sharp switching on and off inherent to the square- waveform causes extremely high frequency vibrations in the lamp.

MCSW has five groups and one squadron which deliver three primary Satellite Communications (SATCOM) product lines: The Protected Communications Group provides the United States Department of Defense (DoD) survivable, global, secure, protected, jam- resistant communications for high priority military ground, sea, and air assets. The group provides operations and sustainment support to the on-orbit Milstar Communications satellite constellation. In addition, the group executes the $6.7B Advanced Extremely High Frequency (AEHF) and $1.2B Enhanced Polar SATCOM (EPS) programs. The user equipment or terminals for the DoD protected communication systems in the currently operational Milstar Command Post Terminal (CPT) and $3.2B Family of Advanced Beyond-Line-of-Sight Terminals (FAB-T) development program.

Solar Orbiter launch closeup In 2020, an Atlas V carried the Solar Orbiter spacecraft, an international collaboration between the European Space Agency (ESA) and NASA to provide a new global view of the sun. In March, an Atlas V also launched Advanced Extremely High Frequency 6 (AEHF-6), the first U.S. Space Force National Security Mission. In May 2020, ULA launched an Atlas V rocket carrying the USSF-7 mission with the X-37B spaceplane for the U.S Space Force and the mission honors victims of the COVID-19 pandemic as well as first responders, health professionals, military personnel, and other essential workers. On 30 July 2020, Atlas V in the 541 configuration successfully launched Perseverance and Ingenuity as part of Mars 2020 towards Mars.

As of mid-2019, as regards actual satellites in orbit being operated and controlled by the then- AFSPC, the Air Force reported that there were four Advanced Extremely High Frequency communications; one ATRR; five Defense Meteorological Satellite Program; six Defense Satellite Communications System satellites; five Defense Support Program; 31 Global Positioning System satellites; four GSSAP; five Milstar communications; seven Space-Based Infrared System (SBIRS, infra-red, launch warning); two SBSS; and seven WGS. The Boeing X-37B and its low-profile missions also represent a significant U.S. orbital asset. The fifth and latest X-37 mission, USA-277, was launched on 7 September 2017, and was the longest X-37 mission to date, landing on 27 October 2019 after in orbit.

DNS Robtex Analysis of a Fast flux domain Fast flux is a DNS technique used by botnets to hide phishing and malware delivery sites behind an ever-changing network of compromised hosts acting as proxies. It can also refer to the combination of peer-to-peer networking, distributed command and control, web- based load balancing and proxy redirection used to make malware networks more resistant to discovery and counter-measures. The Storm Worm (2007) is one of the first malware variants to make use of this technique. The basic idea behind Fast flux is to have numerous IP addresses associated with a single fully qualified domain name, where the IP addresses are swapped in and out with extremely high frequency, through changing DNS records.

Then, using Milstar, the aide, a military officer, would contact the National Military Command Center and NORAD to determine the scope of the pre-emptive nuclear strike and prepare a second strike, following which Milstar/Advanced Extremely High Frequency or Boeing E-4Bs and TACAMOs would air the currently valid nuclear launch code to all operational nuclear delivery systems. Where a two-person verification procedure would be executed following this, the codes would be entered in a Permissive Action Link. Before the order can be processed by the military, the president must be positively identified using a special code issued on a plastic card, nicknamed the "biscuit".Hacking Nuclear Command and Control, International Commission on Nuclear Non proliferation and Disarmament, p. 10.

In addition to the semi-autonomous ability to decide its own targets, the Brimstone has the capacity to determine where on a target to best impact causing the most damage or resulting in elimination of the target. The missile's advanced sensor package includes its extremely high frequency millimetric wave radar, which allows the weapon to image the target and hence choose a target location. With as many as twenty-four missiles in the air, the missile's targeting system also required an algorithm to ensure that missiles hit their targets in a staggered order, rather than all simultaneously. Brimstone can be fired in a number of attack profiles; direct or indirect against single targets, a column of targets or against an array of targets.

The WirelessHD specification is based on a 7 GHz channel in the 60 GHz Extremely High Frequency radio band. It allows either lightly compressed (proprietary wireless link-aware codec) or uncompressed digital transmission of high-definition video and audio and data signals, essentially making it equivalent of a wireless HDMI. First-generation implementation achieves data rates from 4 Gbit/s, but the core technology allows theoretical data rates as high as 25 Gbit/s (compared to 10.2 Gbit/s for HDMI 1.3 and 21.6 Gbit/s for DisplayPort 1.2), permitting WirelessHD to scale to higher resolutions, color depth, and range. The 1.1 version of the specification increases the maximum data rate to 28 Gbit/s, supports common 3D formats, 4K resolution, WPAN data, low-power mode for portable devices, and HDCP 2.0 content protection.

Their space-related products included liquid-fuel engines for expendable and reusable launch vehicles, upper-stage engines, satellite propulsion, large solid boosters, and integrated propulsion subsystems. Aerojet qualified a 4.5-kW Hall effect thruster electric propulsion system based on technology licensed from the Busek Corporation."Development of the BPT family of U.S.-designed Hall current thrusters for commercial LEO and GEO applications" D. King, D. Tilley, R. Aadland, K. Nottingham, R. Smith, C. Roberts (PRIMEX Aerospace Co., Redmond, WA), V. Hruby, B. Pote, and J. Monheiser (Busek Co., Inc., Natick, MA) AIAA-1998-3338 AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 34th, Cleveland, OH, July 13–15, 1998 Aerojet is under contract to Lockheed Martin to provide the first two shipsets of the new thruster system for the next generation Advanced Extremely High Frequency (AEHF) system, a US Air Force program.

A development on the suppressed field system was to display the image from one of the fields at a much higher intensity on the television screen during the time when the film gate was closed, and then capture the image as the second field was being displayed. By adjusting the intensity of the first field, it was possible to arrange it so that the luminosity of the phosphor had decayed to exactly match that of the second field, so that the two appeared to be at the same level and the film camera captured both.This method came to be preferred. Another technique developed by the BBC, known as 'spot wobble', involved the addition of an extremely high frequency but low voltage sine wave to the vertical deflection plate of the television screen, which changed the moving 'spot' - a circular beam of electrons by which the television picture was displayed - into an elongated oval.

Several ways of implementing this exist, and hot-wire devices can be further classified as CCA (constant current anemometer), CVA (constant voltage anemometer) and CTA (constant-temperature anemometer). The voltage output from these anemometers is thus the result of some sort of circuit within the device trying to maintain the specific variable (current, voltage or temperature) constant, following Ohm's law. Additionally, PWM (pulse-width modulation) anemometers are also used, wherein the velocity is inferred by the time length of a repeating pulse of current that brings the wire up to a specified resistance and then stops until a threshold "floor" is reached, at which time the pulse is sent again. Hot-wire anemometers, while extremely delicate, have extremely high frequency-response and fine spatial resolution compared to other measurement methods, and as such are almost universally employed for the detailed study of turbulent flows, or any flow in which rapid velocity fluctuations are of interest.