Vertebrate behavior and ecology. Progress report, July 1, 1973--June 30, 1974 Page: 16 of 89
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signal conditioning was not covered inthe preliminary HCL proposal,
it is felt that a decision needs to be made regarding who will study
- this problem further. This problem is solvable and would involve
building or purchasing additional hardware.
III. Signal Sampling
While the proposed computer system would have to sample the
voltage variation on 100 different channels, it is sufficient
for the purposes of exposition to restrict attention to a single
channel.
Assuming a signal of adequate strength with a properly tuned
receiver, the-digitally sampled voltage variation obtained by the
computer should look like Figure III.1 on page 7 in the case of the
reference-signal. Figure III.1 represents'a-digitally sampled-
signal from one antenna revolution where the true bearing is centrally
located in the cycle. The other extreme is illustrated by Figure
I11.2. on page 8. These two figures demonstrate that- the starting
point-for:sampling needs to be about.-1800.:in advance of the--true -
bearing.-. -To accomplish this on a sustained basis,.the preceding- :
estimated bearing will have to be used to set the starting point
for sampling.the next signal.
Independently of whether 180 or 360 points are taken per 360*,
it is recommended that the sampling be triggered by the photocell
and light source at each tower. Such synchronization will prevent
any rotation rate variations from influencing the shape of the signal
Pattern and hence the bearing estimate.
IV. Bearing Estimation
For a digitized signal pattern similar to Figure III.1 on
page 7, the estimation problem is relatively simple. However, not
all procedures which can be devised for the reference signal will
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Tester, J. R. & Siniff, D. B. Vertebrate behavior and ecology. Progress report, July 1, 1973--June 30, 1974, report, July 1, 1974; United States. (https://digital.library.unt.edu/ark:/67531/metadc1026633/m1/16/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.