Omega (English spelling)

Japanese: オメガ(英語表記)Omega
Omega (English spelling)
A type of radio navigation. Abolished in 1997. Based on the same hyperbolic radio navigation principle as Loran and Decca, eight Omega stations around the world send out radio signals every 10 seconds for about one second. The phase difference between any two of these signals is measured with an Omega receiver, and the ship's position is determined using an Omega chart or table. By using radio waves with long wavelengths (10-14kHz), the effective range is now 5,000-6,000 nautical miles, with an accuracy of about 1 nautical mile, greatly improving performance. It was abolished due to the widespread use of the more accurate Global Positioning System (GPS).

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
電波航法の一つ。1997年廃止。ロランやデッカと同じ双曲線電波航法の原理によるもので,世界に 8局設置されたオメガ局から 10秒ごとに発射される約 1秒の信号電波のうち,任意の 2局の信号間の位相差をオメガ受信機で測定し,オメガチャートまたはオメガ表によって船位を決めた。長い波長の電波(10~14kHz)を使って有効距離を 5000~6000カイリ,精度 1カイリ程度と大幅に性能を向上させた。より精度の高い全地球測位システム GPSの普及に伴い廃止された。

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