Irregular prt deconvolution method and systems, and its uses

Details Irregular prt deconvolution method and systems, and its uses Irregular prt deconvolution method and systems, and its uses

G - Physics

01

S

G01S 13/02 (2006.01) G01D 3/032 (2006.01) G01S 13/522 (2006.01) G06F 17/10 (2006.01)

Patent

CA 2431094

This invention relates to radar signal processing and, in particular, to Doppler processing and clutter filtering on irregular Pulse Repetition Time (PRT) sampled signal. This invention solves problems relating to velocity ambiguity and filtering of clutter, and provides a deconvolution method which filters any kind of clutter. The deconvolution method of irregular pulse repetition time sampled signal x (t m), comprises the following steps: [S1] conversion of the irregular samples x(t m) to regular samples r(iT.epsilon.); [S2] computation of the spectrum dft(r) of these regular samples; [S3] isolation of the clutter spectra in dft(r) by assuming clutter spreads over more than a few range gates; [S4] estimation of the clutter spectral lines from the mean and the width of the isolated clutter spectra; [S5] subtraction of the estimated clutter spectra from the total spectrum dft(r); and [S6] deconvolution of the remaining spectra.

La présente invention concerne le traitement de signaux radar, plus précisément le traitement de signaux Doppler et le filtrage du fouillis d'échos d'un signal d'échantillonné à temps de récurrence d'impulsions (TRI) irrégulier. L'invention permet de résoudre les problèmes reliés à l'ambiguïté en vitesse et au filtrage du fouillis d'échos, et fournit une méthode de déconvolution pour filtrer des fouillis d'échos de toutes sortes. Le méthode de déconvolution de signaux d'échantillonné à temps de récurrence d'impulsion irrégulier x (t m) comprend les étapes suivantes : S1| conversion des échantillons irréguliers x(t m) en échantillons réguliers r(iT.epsilon.); ¬S2| calcul du spectre dft(r) de ces échantillons réguliers; ¬S3| isolation du spectre du fouillis d'échos dft(r) en supposant que ce fouillis s'étend sur plus de quelques portes en distance; ¬S4| estimation des lignes de spectre du fouillis d'échos à partir de la moyenne et de la largeur du spectre du fouillis d'échos isolé; ¬S5| soustraction du spectre du fouillis isolé frm du spectre total dft(r); ¬S6| deconvolution du reste du spectre.

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