Global Positioning System Reference
In-Depth Information
FIGURE 8.6. LORAN—Long Range Navigation. Two signals transmitted simulta-
neously from A and B will reach the receiver, X , at different times, unless the receiver
happens to be equidistant from the two transmitters. From the time difference we
know that the receiver must lie somewhere on the bold LoP—a hyperbola. (For a dif-
ferent time difference, the receiver would lie on one of the other LoPs shown.) Stated
differently, the length AX differs from the length BX by the same amount anywhere
along the curve. To fix the receiver location, a third transmitter signal must be picked
up by the receiver. This third signal yields another hyperbolic LoP, which intersects
the bold line, fixing the receiver's position.
 
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