Análisis del efecto de la interferencia WiFi sobre la velocidad Doppler en radar meteorológico

Abstract

In this work we present an analysis of the WiFi interference effect over the Doppler velocity estimation in weather radar applications with constant pulse repetition interval. First, we performed an study using a simplified signal model that assumes a zero spectral width, showing that the interference presence produces hops in the velocity estimates equals in module to the maximun unambiguous velocity. We also derive an expresion to the velocity hop probability, which depends on interfence-to-signal power ratio (ISR), the number of pulses in the coherent processing interval and the sum of the signal and interference phases.We extend the analysis to a signal model based on a Gaussian power spectral density with a given spectral width. In this case, the study is performed throughout simulations. We evaluate the root mean square error of the velocity estimates in function of spectral width for different ISR values. We show that for spectral widths usual in practice, the behavior is similar to the simplified model, i.e. for some estimates there are velocity hops and others are not affected or at least the interference effect is not appreciable. Finally, we determine an optimal velocity threshold to estimate the hop probability for signals with arbitrary spectral width, by means of a normality test.