US PATENT SUBCLASS 356 / 5.12
.~.~.~.~ Including an alternating reference path

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}
5.11  DF  .~.~.~ Having multiple carrier or modulation frequencies {1}
5.12.~.~.~.~ Including an alternating reference path

DEFINITION

Classification: 356/5.12

Including an alternating reference path:

(under subclass 5.11) Subject matter that incorporates a path of known distance through which the transmitted signal is alternately sent in order to phase calibrate the receiver circuity for the received measuring signal from the target.