Appeal No. 1997-1317
Application No. 08/371,995
A. The invention
The invention is a device for distance measurement
by radar.
B. The claims
Claim 1, the sole independent claim, reads as
follows:
1. Device for distance measurement by radar,
comprising:
(a) a distance measuring device having a frequency
modulated radar -transmitter and -receiver (10) for guiding a
radar beam onto an object to be measured and reflecting said
beam from the object and for mixing of a transmitted frequency
with a received frequency, a beat signal (30) [being]
generated by mixing the transmitted and received frequencies,
(b) [a] frequency modulator connected to the radar
-transmitter and -receiver for periodically varying the
transmitted frequency of the radar signal of the radar
-transmitter and -receiver as a saw tooth function and wherein
the frequency of the beat signal corresponds to a travel time
of the radar beam reflected by the object to indicate a
measure of a distance of the object and
(c) a signal processing circuit connected to the
modulator generating a measured value corresponding to the
distance of the object and,
(d) a phase control circuit (phase locked loop
circuit) (66) connected to the modulator for feeding the beat
signal and for providing an output frequency, the output
frequency forming the measured value of the distance.
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