Efficient adaptive filter bank

Details Efficient adaptive filter bank Efficient adaptive filter bank

1984-01-10

1987-03-24

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Clutter elimination

Mti

342 15, 342 22, G01S 1352

Patent

active

046528814

ABSTRACT:
An N-point Fourier transform circuit for a moving target indicator system including a delay circuit with 2N-2 delays, N frequency filters, a processor for forming a main signal and N-1 auxiliary signals via time sample manipulation, a Gram-Schmidt adaptive canceller circuit for decorrelating the N-1 auxiliary signals from the main signal, and a first and second commutating switches. The first switch tracks a given set of N time samples through the delay circuit. The second switch switches the given set of N time samples through a different successive frequency filters of the N frequency filters every transmission. The first switch tracks in synchronism with the second switch and switches to obtain a new given set of N time samples every NT seconds.

REFERENCES:
patent: 3202990 (1965-08-01), Howells
patent: 3978483 (1976-08-01), Lewis et al.
patent: 4044359 (1977-08-01), Applebaum et al.
patent: 4075633 (1978-02-01), Lewis
patent: 4086592 (1978-04-01), Lewis et al.
patent: 4093950 (1978-06-01), Rhys
patent: 4359736 (1982-11-01), Lewis
patent: 4468794 (1984-08-01), Waters et al.
E. Ferrara, Jr., "The Time-Sequenced Adaptive Filter"; (IEEE Trans. on Circuits and Systems, vol. CAS-28, No. 6, 6/81; pp. 519-523).

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