US PATENT SUBCLASS 356 / 5.15-- .~.~.~ Having specific IF mixing of returns

US PATENT SUBCLASS 356 / 5.15
.~.~.~ Having specific IF mixing of returns

Current as of: June, 1999
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356 /	HD	OPTICS: MEASURING AND TESTING

3	DF	RANGE OR REMOTE DISTANCE FINDING {9}
4.01	DF	.~ With photodetection {11}
5.1	DF	.~.~ Of CW phase delay {4}
5.15		.~.~.~ Having specific IF mixing of returns

DEFINITION

Classification: 356/5.15

Having specific IF mixing of returns:

(under subclass 5.1) Subject matter that incorporates demodulation by optically or electrically heterodyning the received signals to an intermediate frequency (IF) for further processing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4.09+, for systems that mix the return with another beam to produce a fringe pattern to be counted and frequency analyzed as a direct measurement of range.

5.09, for systems that detect frequency of modulation to determine range where the beat frequency of a mixed or compared beam is not directly related to a coherent interference fringe count or to CW phase delay.