SYSTEMS AND METHODS FOR FFT-BASED MICROWAVE DISTANCE SENSING FOR A PLUMBING FIXTURE

摘要

Systems and methods for detecting a position of an object relative to a plumbing fixture are provided. A described method includes emitting a microwave detection signal toward a moving object, receiving an echo-wave signal reflected from the moving object, and superimposing the microwave detection signal and the echo-wave signal to produce a superimposed time domain signal. The method further includes performing a Fast Fourier Transformation on the time domain signal to generate a frequency domain signal, integrating the frequency domain signal, and actively adjusting a result of the integration by subtracting a predetermined amount from the result. The predetermined amount is at least one of: a volume contribution amount and an interference contribution amount. The method further includes determining a position of the moving object relative to the plumbing fixture by comparing the adjusted integration result with a distance standard curve.