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  2. Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Global_Positioning_System

    All satellites broadcast at the same two frequencies, 1.57542 GHz (L1 signal) and 1.2276 GHz (L2 signal). The satellite network uses a CDMA spread-spectrum technique [167]: 607 where the low-bitrate message data is encoded with a high-rate pseudo-random (PRN) sequence that is different for each satellite. The receiver must be aware of the PRN ...

  3. Cyberwarfare - Wikipedia

    en.wikipedia.org/wiki/Cyberwarfare

    There is ongoing debate over how cyberwarfare should be defined and no absolute definition is widely agreed upon. [9] [12] While the majority of scholars, militaries, and governments use definitions that refer to state and state-sponsored actors, [9] [13] [14] other definitions may include non-state actors, such as terrorist groups, companies, political or ideological extremist groups ...

  4. Internet censorship in Iran - Wikipedia

    en.wikipedia.org/wiki/Internet_censorship_in_Iran

    Following the establishment of a theocratic government in 1979, religious authorities used a mix of bombastic propaganda and brutal censorship to consolidate their political power and demonize potential opponents. [21]

  5. 2023 in science - Wikipedia

    en.wikipedia.org/wiki/2023_in_science

    12 April: Researchers demonstrate an 'AI scientist' that can rediscover physical laws from axioms and data. 14 April: Launch of the JUICE mission to Jupiter. 3 April. Five employees at the National Hurricane Center publish a tropical cyclone report (TCR) on Hurricane Ian, which officially upgrades the hurricane from a Category 4 to a Category 5 on the Saffir–Simpson scale.