Extraction of relative signals from closely spaced targets...

Details Extraction of relative signals from closely spaced targets... Extraction of relative signals from closely spaced targets...

2011-03-22

2011-03-22

Tarcza, Thomas H (Department: 3662)

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

Synthetic aperture radar

C342S080000, C342S149000, C342S427000

Reexamination Certificate

active

07911371

ABSTRACT:
Systems and methods are provided for extracting relative signal parameters representing two closely spaced targets from monopulse scan data. A maximum quadrature angle value from the scan data is compared with a threshold quadrature value representing a noise level. A linear polynomial model is utilized if the maximum quadrature angle exceeds the threshold value. The linear polynomial model fits a function of the azimuth angle values and quadrature angle values to a linear function of an exponential parameter derived from the boresight angles to produce polynomial coefficients and determines the relative signal parameters from the polynomial coefficients. A cubic polynomial model is utilized if the maximum quadrature angle fails to exceed the threshold value. The cubic polynomial model fits azimuth angle values to a cubic function of corresponding boresight angles to produce a set of polynomial coefficients and determines the relative signal parameters from the set of polynomial coefficients.

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Karam: Application for patent being concurrently filed on Feb. 26, 2009, for “Detection and Resolution of Closely Spaced Targets in a Monopulse System”.

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