Communications: directive radio wave systems and devices (e.g. – Clutter elimination
Patent
1986-11-06
1994-07-05
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Clutter elimination
342195, G01S 13534
Patent
active
053271416
ABSTRACT:
Apparatus and method for removing unwanted components of a signal received from a radar transmitter. The unwanted components lie in a clutter Doppler frequency band. Such components are removed by first sampling the received signal at a rate sufficient to cause components of the received signal in the clutter Doppler frequency band to be validly sampled and components of the received signal in a desired target Doppler frequency band to be invalidly sampled. A signal equivalent to the values of a polynomial fit to this sampled signal then provides an estimate of the unwanted clutter components. This estimate is subtracted from the original received signal to provide a signal with the unwanted clutter components removed. A significant improvement in receiver sensitivity as well as a reduction in dynamic range requirements of a post detection digital signal processor is achieved through the use of this invention.
REFERENCES:
patent: 3220002 (1965-11-01), Shrader
patent: 3706095 (1970-11-01), Cherwek
patent: 3742500 (1973-06-01), Freedman
patent: 4117538 (1978-09-01), Shrader et al.
patent: 4510944 (1985-04-01), Porges
patent: 4559537 (1985-12-01), Pearson, Jr. et al.
"On the Use of Windows for Harmonic Analysis with the Discrete Fourier Transform", by Fredric J. Harris, Proceedings of the IEEE, vol. 66, No. 1, Jan. 1978, pp. 51-85.
Barron Jr. Gilberto
Mofford Donald F.
Raytheon Company
Sharkansky Richard M.
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