Appeal No. 2000-0957
Application 06/344,455
and altitude y to a selected target." The design of the PPI
display would look something like figure 7 of Harris
(col. 3, lines 34-41). As the elevation angle of the
antenna changes, the spot is scanned along the elevation
angle on the screen, the intensity of the spot is modulated,
and the location of the target is indicated as a bright spot
along the scanning line (col. 8, lines 42-53). The
intersection of the scanning lines represents the location
of the receiver. As shown in figures 8 and 9, a large
target (such as a large irregularity in the transmission
path) may appear as spots on several scanning lines 122.
The distance to the spot along the scanning line is linearly
proportional to the distance S to the target (col. 8,
2
lines 52-53). The horizontal axis on the display
corresponds to distance x and the vertical axis on the
display corresponds to the height y (col. 15, lines 5-59).
The scanning lines may be shifted to one side of the display
with a bias voltage as illustrated in figures 8 and 9
(col. 15, lines 56-59). The PPI displays the coordinates of
the target with reference to a rectangular frame of
reference (col. 4, lines 64-70), presumably a rectangular
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Last modified: November 3, 2007