Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Patent
1982-09-30
1988-10-25
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
342160, G01S 1300
Patent
active
047807202
ABSTRACT:
A circuit for generating an output signal L indicative of the mean clutter level at a selected location in the field of view of a radar apparatus, particularly the sea surface which exhibits a swell pattern. The circuit includes processing circuits which generate weighting coefficients (a.sub.1, a.sub.2, . . . a.sub.N) used to weight the amplitudes of returns derived respectively from a group of N discrete locations which precede in range and or succeed in range the selected location. The circuit generates the elements r(n) of a matrix [r] which represents the auto correlation function of the amplitude of returns derived from w discrete locations encompassing the group of N locations. Circuit then uses the matrix [r] to compute the weighting coefficients (a.sub.1, a.sub.2. . . a.sub.N) which are stored at 13 applied to respective multiplying circuits to weight corresponding amplitudes accessed to respective locations of a shift register. The weighted amplitudes are averaged at to generate the signal L, indicative of the means clutter level. A threshold value, related to the mean level L is then compared at 18 with the amplitude of a return actually observed at the selected location. If the observed value exceeds the threshold then a target is declared.
REFERENCES:
patent: 3701149 (1972-10-01), Patton et al.
patent: 3797014 (1974-03-01), Tompkins et al.
patent: 4117538 (1978-09-01), Shrader et al.
patent: 4159477 (1979-06-01), Le Beyec
patent: 4242682 (1980-12-01), Musha et al.
patent: 4318101 (1982-03-01), Musha et al.
patent: 4386353 (1983-05-01), Bleijerveld et al.
patent: 4488154 (1984-12-01), Ward
R. Benjamin-"Generalisations of Maximum-Entropy Pattern Analysis", IIE Proc., vol. 127, Pt. F. No. 5, Oct. 1980, pp. 341-353.
EMI Limited
Sotomayor John B.
Tarcza Thomas H.
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