Practical considerations in pulse-echo radar for short range sensing

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.