4 ms·
The story I’ve heard was that GPS was invented due to Sputnik. The Doppler shift in its beeps proved its speed and thus its orbit. Somebody (in the Navy?) wond
by thecabinet 6y ago
The story I’ve heard was that GPS was invented due to Sputnik. The Doppler shift in its beeps proved its speed and thus its orbit. Somebody (in the Navy?) wondered if the “reverse” could be done: could you listen to various shifting beeps and figure out your location?