Appeal No. 2001-0603
Application 09/028,063
The invention is directed to solving the problem of
determining the direction of arrival of a spread spectrum signal
from among the various spread frequency components within the
bandwidth of the spread spectrum signal using an array of signal
sensing elements. See Appellant’s specification, page 2.
Independent claim 2 is reproduced as follows:
2. A method of determining the direction of arrival of a
traveling spectrally spread signal wavefront of measurable
center-frequency wavelength, comprising the steps of :
employing an array of signal-sensing elements;
taking the differences between the outputs of pairs of
spaced elements;
taking the output of a signal element and shifting it in
frequency by an amount fifHz and inverting its instantaneous
envelope waveform;
multiplying each of said differences between outputs by said
frequency-shifted, inverted-envelope single-element output, and
selecting the product components at fifHz;
detecting the amplitude of each of said product components
at fifHz; and
determining said direction of arrival from detected
amplitudes of said product components.
References
The references relied on by the Examiner are as follows:
Green et al. (Green) 3,939,477 Feb. 17, 1976
Baghdady 4,513,249 Apr. 23, 1985
Tong 4,809,012 Feb. 28, 1989
2
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