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Abstract
Three field experiments were conducted using a surface currents ultra-high frequency (UHF) radar system at fresh water during 2005. Two geometries for the transceiver antennas were examined: bistatic on a bank with an obstruction between them and backscatter on a bank. Echo Doppler spectra from a lake and two rivers were observed and interpreted. The first-order Bragg-echoes with Signal-to-Noise Ratios (SNR) of 20–50 dB were received and the maximum range was about 500 m with about 2∼3 w of transmitter power. Along-river surface currents have been measured using the UHF radar system. Comparisons with a conventional propeller-type current meter indicated that currents measured by UHF radar closely tracked in-situ current measurements.
