In modern aviation, navigation is one of the most vital elements for safe and efficient flight. While traditional techniques like pilotage and dead reckoning still serve as foundational skills, ...

Aircraft navigation has evolved from basic pilotage and dead reckoning to sophisticated electronic systems powered by radio waves. Today’s pilots rely on navigational aids that don’t require visual ...

High-frequency (HF) ground wave radar is widely used in maritime target detection and marine environment observation. Its performance is often degraded by co-frequency interference of the HF band. It ...

Ronald Lytel, American, born 1971 Thomson Consumer Electronics Manufacturer Radio Corporation of America, American, founded 1919 Catalogue Status Research in Progress Description Brown form ...

SINGULARLY little seems to be known as to the extent to which radio (wireless) waves will penetrate into the ground, and yet information on this very point has become quite desirable inasmuch as ...

This paper analyzes radio wave propagation characteristics in a tunnel with a rectangular cross section and multi-layer-structure walls. These walls consist of a surface moisture layer, concrete, ...

WITH the introduction of radio waves a few metres in wave-length in the years before the Second World War, and of centimetric waves during the War, entirely new meteorological effects on ...

Mountains, sub-glacial lakes, hidden valleys, even remnants of lost civilizations: what lies under Antarctica’s vast 2,000-metre thick ice sheet has long been a mystery akin to the depths of the ...

Last year, astronomers detected a powerful burst of radio waves from within our galaxy. Researchers now say it came from NASA's defunct Relay 2 satellite — but they're not sure what caused it.