Accession Number : ADD004221

Title :   Digital Mean Clutter Doppler Compensation System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Hsiao,James K

Report Date : 12 Jun 1977

Pagination or Media Count : 8

Abstract : A digital technique is disclosed for filtering clutter in a pulse doppler MTI radar which allows a filter notch to be set for different doppler frequencies. In particular the system includes two or more MTI filters cascaded to cancel different kinds of clutter signals that interfere with target signal reception. In each filter a digital detection circuit senses the mean-clutter-doppler frequency for a particular clutter type and automatically places a notch at that frequency. Each notch is fixed by treating the radar samples as complex numbers and replacing the conventional filter coefficients with complex coefficients indicating amplitude and phase as derived from the radar returns. (Author)

Descriptors :   *Patents, *Radar clutter, *Doppler effect, *Moving target indicators, *Signal processing, Digital systems, Bandstop filters, Electric filters, Mean, Cancellation, Complex variables

Subject Categories : Countermeasures
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE