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COM DEV International
COM DEV International was a satellite technology, space sciences, and telecommunications company based in Cambridge, Ontario, Canada. The company had branches and offices in Ottawa, the United States, the United Kingdom, China and India. COM DEV developed and manufactured specialized satellite systems, including microwave systems, switches, optical systems, specialized satellite antennas, as well as components for the aviation and aerospace industry. COM DEV also produced custom equipment designs for commercial, military and civilian purposes, as well as providing contract research for the space sciences. History COM DEV International was founded in 1974 and specialized in microwave technology for the aviation and aerospace industry. The company would go on to become a leader in space satellite componentry and hardware, specializing in telecommunication systems; [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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McMaster University
McMaster University (McMaster or Mac) is a public research university in Hamilton, Ontario, Canada. The main McMaster campus is on of land near the residential neighbourhoods of Ainslie Wood, Ontario, Ainslie Wood and Westdale, Ontario, Westdale, adjacent to the Royal Botanical Gardens, Ontario, Royal Botanical Gardens. It operates six Faculty (division), academic faculties: the DeGroote School of Business, McMaster Faculty of Engineering, Engineering, McMaster Faculty of Health Sciences, Health Sciences, Humanities, McMaster Faculty of Social Sciences, Social Science, and McMaster Faculty of Science, Science. It is a member of the U15 Group of Canadian Research Universities, U15, a group of research-intensive universities in Canada. The university bears the name of William McMaster, a prominent Canadian Senate of Canada, senator and banker who bequeathed Canadian dollar, C$900,000 to its founding. It was incorporated under the terms of an act of the Legislative Assembly of On ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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Aviation
Aviation includes the activities surrounding mechanical flight and the aircraft industry. ''Aircraft'' include fixed-wing and rotary-wing types, morphable wings, wing-less lifting bodies, as well as lighter-than-air aircraft such as hot air balloons and airships. Aviation began in the 18th century with the development of the hot air balloon, an apparatus capable of atmospheric displacement through buoyancy. Clément Ader built the "Ader Éole" in France and made an uncontrolled, powered hop in 1890. This was the first powered aircraft, although it did not achieve controlled flight. Some of the most significant advancements in aviation technology came with the controlled gliding flying of Otto Lilienthal in 1896. A major leap followed with the construction of the '' Wright Flyer'', the first powered airplane by the Wright brothers in the early 1900s. Since that time, aviation has been technologically revolutionized by the introduction of the jet engine which enabl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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Sapphire (satellite)
Sapphire is a Canadian space surveillance satellite which was launched in 2013. Sapphire was commissioned and integrated by MacDonald, Dettwiler and Associates (MDA) based on an SSTL-150 bus produced by Surrey Satellite Technology (SSTL) and an optical payload produced by COM DEV International. Details Sapphire, Canada's first military satellite, is a small spacecraft designed to monitor space debris and satellites within an orbit 3,728 to 24,855 miles (6,000 to 40,000 kilometres) above Earth. The satellite has been providing data to the United States Space Surveillance Network since January 2014. The satellite has a mass of , and carries a three-mirror anastigmat to track artificial objects in medium Earth orbit to geosynchronous Earth orbit. ISRO's Ball Lock separation system IBL-298 was used for separating the satellite. The optical system is based on the design of the Space-Based Visible (SBV) sensor. This telescope was developed for the Midcourse Space Experiment. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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Surface Acoustic Wave
A surface acoustic wave (SAW) is an acoustic wave traveling along the surface of a material exhibiting elastic (solid mechanics), elasticity, with an amplitude that typically decays exponentially with depth into the material, such that they are confined to a depth of about one wavelength. Discovery SAWs were first explained in 1885 by Lord Rayleigh, who described the surface acoustic mode of propagation and predicted its properties in his classic paper. Named after their discoverer, Rayleigh waves have a Longitudinal wave, longitudinal and a vertical shear component that can couple with any media like additional layers in contact with the surface. This coupling strongly affects the amplitude and velocity of the wave, allowing SAW sensors to directly sense mass and mechanical properties. The term 'Rayleigh waves' is often used synonymously with 'SAWs', although strictly speaking there are multiple types of surface acoustic waves, such as Love waves, which are Polarization (waves), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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Multiplexer
In electronics, a multiplexer (or mux; spelled sometimes as multiplexor), also known as a data selector, is a device that selects between several Analog signal, analog or Digital signal (electronics), digital input signals and forwards the selected input to a single output line. The selection is directed by a separate set of digital inputs known as select lines. A multiplexer of 2^n inputs has n select lines, which are used to select which input line to send to the output. A multiplexer makes it possible for several input signals to share one device or resource, for example, one analog-to-digital converter or one communications transmission medium, instead of having one device per input signal. Multiplexers can also be used to implement Boolean algebra, Boolean functions of multiple variables. Conversely, a demultiplexer (or demux) is a device that takes a single input signal and selectively forwards it to one of several output lines. A multiplexer is often used with a complem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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Telemetry
Telemetry is the in situ collection of measurements or other data at remote points and their automatic transmission to receiving equipment (telecommunication) for monitoring. The word is derived from the Greek roots ''tele'', 'far off', and ''metron'', 'measure'. Systems that need external instructions and data to operate require the counterpart of telemetry: telecommand. Although the term commonly refers to wireless data transfer mechanisms (e.g., using radio, ultrasonic, or infrared systems), it also encompasses data transferred over other media such as a telephone or computer network, optical link or other wired communications like power line carriers. Many modern telemetry systems take advantage of the low cost and ubiquity of GSM networks by using SMS to receive and transmit telemetry data. A ''telemeter'' is a physical device used in telemetry. It consists of a sensor, a transmission path, and a display, recording, or control device. Electronic devices are widely u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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Garden Grove, California
Garden Grove is a city in northern Orange County, California, United States. The population was 171,949 at the 2020 census. State Route 22, also known as the Garden Grove Freeway, passes through the city in an east–west direction. The western portion of the city is known as West Garden Grove. Photograph of downtown Garden Grove in 1950 and 1912. History 19th century Rancho Las Bolsas was a land grant under Mexican governance that primarily dealt in cattle ranching in the central Orange County floodplains. The land had originally belonged to the indigenous Tongva and Acjachemem people, but featured displacement under the Spanish colonization and Mexican land grants. Garden Grove was founded by Alonzo Cook in 1874. A school district and Methodist church were organized that year. It remained a small rural crossroads and farming community until the arrival of the Pacific Electric Railroad in 1905. The rail connection helped the town prosper with the influx of tourists, vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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Waveguide
A waveguide is a structure that guides waves by restricting the transmission of energy to one direction. Common types of waveguides include acoustic waveguides which direct sound, optical waveguides which direct light, and radio-frequency waveguides which direct electromagnetic waves other than light like radio waves. Without the physical constraint of a waveguide, waves would expand into three-dimensional space and their intensities would decrease according to the inverse square law. There are different types of waveguides for different types of waves. The original and most common meaning is a hollow conductive metal pipe used to carry high frequency radio waves, particularly microwaves. Dielectric waveguides are used at higher radio frequencies, and transparent dielectric waveguides and optical fibers serve as waveguides for light. In acoustics, air ducts and horns are used as waveguides for sound in musical instruments and loudspeakers, and specially-shaped metal rod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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Edinburgh
Edinburgh is the capital city of Scotland and one of its 32 Council areas of Scotland, council areas. The city is located in southeast Scotland and is bounded to the north by the Firth of Forth and to the south by the Pentland Hills. Edinburgh had a population of in , making it the List of towns and cities in Scotland by population, second-most populous city in Scotland and the List of cities in the United Kingdom, seventh-most populous in the United Kingdom. The Functional urban area, wider metropolitan area had a population of 912,490 in the same year. Recognised as the capital of Scotland since at least the 15th century, Edinburgh is the seat of the Scottish Government, the Scottish Parliament, the Courts of Scotland, highest courts in Scotland, and the Palace of Holyroodhouse, the official residence of the Monarchy of the United Kingdom, British monarch in Scotland. It is also the annual venue of the General Assembly of the Church of Scotland. The city has long been a cent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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ExactEarth
exactEarth Ltd is a Canadian company that specializes in data services that deliver real-time global location-based maritime vessel tracking information utilizing patented satellite AIS detection technology. exactEarth provides satellite AIS data services to commercial markets as well as government customers in India, Canada, United States, Australia and across Europe. Founded in 2009, exactEarth is based in Cambridge, Ontario, Canada. The company was publicly traded until 2021 when Spire Global acquired the company. History In 2005, COM DEV International first recognized that the AIS messages being transmitted by major ships could potentially be received from space. COM DEV validated its AIS detection capability through aircraft trials in 2007 and launched a nanosatellite (EV0) in April 2008. exactEarth commenced commercial operations in June 2009. In September 2010, Hisdesat acquired a 27% equity interest in the company for a cash investment of approximately CA$15 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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El Segundo, California
El Segundo ( , ; ) is a city in Los Angeles County, California, United States. Located on Santa Monica Bay, it was incorporated on January 18, 1917, and is part of the South Bay Cities Council of Governments. The population was 17,272 as of the 2020 census, a 3.7% increase from 16,654 in the 2010 census. A significant center of the oil and aerospace industries in Southern California, roughly three quarters of the city's land is dedicated exclusively to industrial and commercial uses, including a Chevron oil refinery which alone takes up more than a quarter of the entire city. History The El Segundo and Los Angeles coastal area was first settled by the Tongva (or Gabrieleños) Native American tribes. The area was once a part of '' Rancho Sausal Redondo'' ("Round Willow Patch Ranch"). Rancho Sausal Redondo extended from Playa Del Rey in the north to Redondo Beach in the south. Originally a Mexican land grant owned by Antonio Ygnacio Avila, the rancho was later purchased by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
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MacDonald, Dettwiler And Associates
MDA Space Ltd. is a Canadian space technology company headquartered in Brampton, Ontario, Canada, that provides geointelligence, robotics and space operations, and satellite systems. History MDA Space (formerly MacDonald, Dettwiler and Associates) was founded in 1969 by John S. MacDonald and Vern Dettwiler in the basement of MacDonald's Vancouver home. The company became a subsidiary of Orbital Sciences Corporation (OSC) from the United States on 17 November 1995. MDA was primary contractor for, and took ownership of, the RADARSAT-2 Earth observation satellite. MDA bought the space robotics division of Spar Aerospace—manufacturer of the Canadarm—in March 1999, renaming it MD Robotics. The company completed the Mobile Servicing System (including the Canadarm2) for the International Space Station. OSC sold its entire stake in 2001. Nearly 70% was sold to a group of Canadian investors; the Ontario Teachers' Pension Plan (OTPP) became the largest shareholder with a 29% stak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |