The Measurement of River Surface Discharge Using Continuous-wave Microwave Radar Techniques

摘要

In Taiwan,rainfall is concentrated and unevenly distributed,and the river discharge volume is altered drastically by the strength and concentration of rainfall during the typhoon periods.Traditional means of manually observing high-volume discharge are time-consuming and dangerous.A non-contact continuous-wave microwave radar apparatus would be more suitable for measuring the vdocity of river surface currents with a high discharge and further estimating the discharge volume.In this study,we applied a method using a linear prediction coefficient (LPC) to replace traditional signalaveraging by fast Fourier transform (FFT) analysis.The objective of this study is to determine a more accurate surface velocity measure by analyzing the backscattered signals produced by the actual river surface currents and filtering the interferences produced by the environment.