What factors affect the measurement accuracy of radar flow meters? What accuracy can be achieved in practical applications?

The accuracy of radar flow meters is mainly affected by the following factors: First, installation conditions—the sensor must be perpendicular to the water surface and installed in a straight channel section (no obstacles at least 5 times the channel width upstream and 2 times the channel width downstream) to avoid turbulent flow fields (such as vortices and backflows). Second, accuracy of cross-sectional parameters—errors in inputting the size and shape of the channel cross-section (e.g., rectangular, trapezoidal) directly affect flow calculation results. Third, environmental interference—strong electromagnetic radiation, heavy rain, dense fog, and a large number of floating objects on the water surface may interfere with radar signals. Fourth, equipment type—integrated radar flow meters that measure both velocity and water level usually have higher accuracy than those that only measure water level. Under ideal conditions (regular cross-section, stable flow field, and matched with standard weirs/flumes), the accuracy can reach within ±3%; in complex scenarios such as natural rivers, the accuracy is generally ±5% to ±10%.