The original intent was for this to be the final article in the Ultrasonic Radar series. In addition to
covering the receiver and microcontroller for the project, it was to go into detail about how to create a
two-dimensional radar that computes not only range but also the bearing (that is, direction). However,
the two-dimensional radar topic really needs to be an article by itself, so that will be covered next time.
One of the challenges in designing an ultrasonic receiver
is the fact that the dynamic range of the signal is large.
When sensor designers refer to dynamic range, they’re
talking about the ratio of the largest received signal to the
smallest received signal.
As mentioned in previous articles, the use of a parabolic
antenna minimizes this dynamic range by focusing the
ultrasonic energy into a narrow cone that is virtually a
cylinder. As a result, the energy loss as a function of distance
So far, we’ve covered the basics of piezoelectric transducers,
the transmitter electronics for driving the transducers, and the
improved focusing of that ultrasonic energy into and out of the
transducer using parabolic antennas.
Radar — Part 5
8 SERVO 09/10.2018
By Dan Harres