In this paper, we present the principle of operation, design, and testing o
f a pulse echo radar unit that utilizes the properties of short helical ant
ennas. Data was captured for targets approaching the radar at three differe
nt controlled velocities, three different target sizes, and three radar ran
ge gate settings, These data reveal the expected Doppler frequency as well
as a second anomalous frequency. The effects of multipath signals, separate
d transmit and receive antennas, and direct antenna coupling are used to ex
plain this anomalous frequency. These effects are mathematically simulated,
and the results compare favorably with the test data.