On 6 Mar 2006 04:26:05 -0800, "mazerom"
wrote:

the doppler shift is fundamentally a tone frequency brought about by a
continuous wave source moving in and out. is it possible to have
reliable doppler shift when our source is spread spectrum or say some
form of digital modulation?

Back around '57 or so, the beep-beeping of the Sputnik satellite was
used to track its orbit by measuring the Doppler effect.

bob
k5qwg