Experts Discussing Doppler Tracking

Mathematician Bill Guier (left) and physicist George Weiffenbach (right) told APL Research Center director Frank T. McClure (center) about using Doppler tracking for Sputnik. McClure suggested that a navigator could use signals from a known satellite position to determine his location anywhere in the world. This idea became the basis for Transit.

Caption:
Mathematician Bill Guier (left), APL Research Center director Frank T. McClure (center), and physicist George Weiffenbach (right).
Type: Photograph
Image Date: 1957
Credit: Johns Hopkins University Applied Physics Laboratory
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Mathematician Bill Guier (left), APL Research Center director Frank T. McClure (center), and physicist George Weiffenbach (right).