Naval Navigation Satellite System

Japanese: 海軍航行衛星システム - かいぐんこうこうえいせいしすてむ
Naval Navigation Satellite System

... Navigation satellites were developed by Johns Hopkins University in the United States and the United States Navy, who noticed that the frequency of radio waves emitted by the Soviet Union's Sputnik 1 fluctuated due to the Doppler effect, and the first navigation satellite, Transit 1B, was launched in 1960. In July 1964, the US military began operation of the Navy Navigation Satellite System (NNSS), and after 1967, parts of the NNSS were opened to civilian use.
[NNSS Structure and Positioning Principles]
The NNSS is made up of satellites that transmit various information necessary for position determination, ground stations that track the satellites and correct the information within the satellites, and receiving stations (ships, aircraft, etc.) that receive signals from the satellites and determine the receiving position.

*Some of the terms mentioned in the "Naval Navigation Satellite System" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… 航行衛星の開発は,ソ連のスプートニク1号の発信する電波の周波数が,ドップラー効果によって変動することに着目したアメリカのジョンズ・ホプキンズ大学とアメリカ海軍により行われ,1960年には最初の航行衛星トランシット1B衛星が打ち上げられた。その後64年7月アメリカ軍により海軍航行衛星システムNavy Navigation Satellite System(NNSS)として運用が開始され,67年以後はNNSSの一部が民間用に公開された。
[NNSSの構成と測位の原理]
 NNSSは位置決定に必要な種々の情報を送信する人工衛星と,人工衛星を追尾し人工衛星内部の情報を修正する地上局,衛星からの信号を受信し受信位置を求める受信局(船や航空機など)から構成されている。…

※「海軍航行衛星システム」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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