A Study on Removal of Radial Interference Echo with Weather Radar

Electromagnetic disturbance (EMI) is an unpredictable event which often cause abnormal radar echo. EMI enables invariant radial interference echo (features such as sun-strobes) existing in certain directions in radar echo charts at many radar stations, the interference echo and the precipitation echo overlap in many regions. The paper key research has analyzed removal of interference echo which laps over precipitation echo, and an algorithm has been proposed. The radial interference echo could be distinguished from precipitation echo by analyzing their differences. According to the wave principle of superposition and the weather radar signal processing principle, the effective precipitation echo power was obtained by processing the echo power, thus disturbance was eliminated. The analyses results show that most of interference echo were detected and removed by the algorithm, especially in the overlap regions. It can eliminate radial interference echo and retain precipitation echo well at the same time.