The first space images were captured in 1946 from a sub-orbital U.S. V-2 rocket at about 105 km altitude. The first actual satellite photograph of Earth was taken on August 14, 1959 by the U.S. Explorer 6 satellite. In 1960, TIROS-1 transmitted the first television image of Earth from orbit, a milestone for weather observation.…
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About 75% of the planet is obscured by cloud cover or darkness at any moment, making optical imaging inaccessible. Synthetic Aperture Radar (SAR) satellites actively illuminate the ground with microwave radar and synthesize a large aperture by moving the antenna to produce high-resolution images. SAR can operate day or night and in all weather, providing…
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Radar altimeters on TOPEX/Poseidon, Jason-1, Jason-2, Jason-3, and Sentinel-6 Michael Freilich have provided a global mean sea level record since 1992, showing a rise of about 3.3 millimeters per year and roughly 10 centimeters over 30 years. Arctic summer sea ice extent has declined by about 12% per decade since the 1980s, with the Arctic…
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The United States operates the Advanced Extremely High Frequency (AEHF) constellation, delivering jam-resistant, global, protected military communications including nuclear command and control links. Navstar GPS is a 31-satellite global navigation system that provides precise positioning, navigation, and timing to guide munitions such as JDAM and to synchronize encrypted networks. Defense Support Program (DSP) and the…
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L-band MSS terminals, such as Inmarsat FleetBroadband and Iridium Certus, provide global coverage with compact antennas but limited data throughput. Ku-band VSAT (12–18 GHz) has been the maritime workhorse, Ka-band HTS (26–40 GHz) offers higher capacity, while C-band deployments are restricted near shore due to interference and large dish requirements. GEO satellites offer broad coverage…
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As of early 2025, about 12.4 million Cameroonians were internet users, representing 41.9% of the population. As of 2024, roughly 60% of Cameroonians live in urban areas, with internet access heavily concentrated in cities and rural areas almost inaccessible. Cameroon’s fiber backbone extends over 12,000 kilometers and is connected to five landfall cables: SAT-3, WACS,…
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Starlink has launched over 8,000 satellites since 2019, serves 125 countries, and by April 2025 reached the 250th dedicated Starlink launch, establishing SpaceX’s network as the largest in orbit. OneWeb, founded in 2014, began Gen1 launches in 2019 with 618 of 648 satellites deployed by March 2023, filed for Chapter 11 in 2020, was rescued…
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In May 2023 the U.S. FCC sided with Starlink over proposed uses of the 12.2–12.7 GHz band, preserving it for satellite services and preventing two-way 5G interference. In August 2022 the FCC denied Starlink’s $885 million Rural Digital Opportunity Fund subsidy due to performance concerns and high equipment costs, including a roughly $600 dish. By…
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Starlink launched its first batch of 60 satellites in 2019, and by late 2024 the constellation numbered nearly 7,000 satellites in low-Earth orbit. In 2022 Starlink introduced laser inter-satellite links, enabling data to hop between satellites and extending coverage to oceans, polar regions, and remote locales. By mid-2023 Starlink declared global coverage aside from regulatory…
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In 2024, the total global drone market was about $73 billion, with forecasts to reach roughly $163–165 billion by 2030 at around a 14% CAGR. Some analyses forecast growth from about $30 billion in 2022 to $260.5 billion by 2030, implying a 27–39% annual growth rate. By 2030 the market’s major segments are projected to…
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