Robust direction-of-arrival estimation for FM sources in the presence of impulsive noise

Time-frequency methods can utilize the non-stationarity of signals to enhance the resolution capability and accuracy in direction-of-arrival estimation. In this paper, we consider the problem of non-stationary sources impinging on an array of sensors in an impulsive noise environment. We apply a robust time-frequency method in combination with morphological image processing to estimate the instantaneous frequency of the sources. Then, for the extracted time-frequency points, we employ robust methods to calculate the averaged spatial time-frequency matrix, which is then used for direction-of-arrival estimation.