Alpha, also known as RSDN-20, is a Russian system for long range radio navigation. RSDN in Russian stands for Радиотехническая Система Дальней Навигации (Radiotehnicheskaya Sistema Dal'ney Navigatsii), which translates to English as "radio-technical long-distance navigation system".
Alpha, also known as RSDN-20, is a Russian system for long range radio navigation. RSDN in Russian stands for Радиотехническая Система Дальней Навигации (Radiotehnicheskaya Sistema Dal'ney Navigatsii), which translates to English as "radio-technical long-distance navigation system".
Source: Wikipedia "Alpha (navigation)" · CC BY-SA 4.0
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