RIVER FLOW SPEED MEASURING METHOD AND SYSTEM BASED ON GNSS-R TECHNOLOGY

摘要

A river flow velocity measuring method base on the GNSS-R technology at least comprises the following steps: down-conversion and sampling are performed on the received direct signals and reflection signals; the received direct signals are processed and the tracking frequency, the pseudo-range and the carrier wave phase observation value of the direct signals are obtained; data screening is performed on the received GNSS satellite reflection signals, eligible GNSS satellite reflection signals are selected, then the tracking frequency of the direct signals is used as a local reference frequency, each selected GNSS satellite reflection signal is processed by using an open-loop tracking method, and the residual phase of each GNSS satellite reflection signal is obtained; and the river flow velocity is inversely solved by using the residual phases output values of each eligible GNSS satellite reflection signal and in combination with the pseudo-range and the carrier wave phase observation value. A river flow velocity measuring system based on the GNSS-R technology is also provided.