A method for detecting and suppression of interference signals in sar - data and device for carrying out the method

摘要

For the detection and suppression of interference signals in sar - data are raw data of a sar - sensor dollar i1 removal lines manner in the frequency range fourier - and the resulting spectrum of dollars i2 in accordance with the bandwidth of the transmitted signal is low-pass filtered. It is, the autocorrelation function of dollars i3 of the low-pass filtered signal u φ t φ (t) and determined by means of the weighting function w (t), the proportions of the useful signal in of the autocorrelation function of dollars i4 suppressed; thus, the interference signal is amplified in the ratio for this purpose. Dollars a subsequently, the power density spectrum of the resulting signal dollar i5 and by means of the madmed - function, a threshold value m calculated from the power density spectrum dollar i6. From the power density spectrum dollar i7, a perfect notch - filters (w φ nideal φ (f) and calculated by weighting of the impulse response of the notch - filter (w φ nideal φ) (t) with a kaiser - bessel - window w φ f φ (t) in the time domain and subsequent inverse transformation into the frequency range, the final notch - filters (w φ n φ (f) is generated, which then to the radar signal u φ t φ (f) is applied. This is the fourier - reverse transformation of the radar signal dollar i8 in the time domain and finally, the disturbance radar signal is generated which has been freed of usd i9.