High-definition imaging apparatus and method

Abstract

A high-definition radar imaging system and method receives image data and adaptively processes the image the data to provide a high resolution image. The imaging technique employs adaptive processing using a constrained minimum variance method to iteratively compute the high-definition image. The high-definition image I is expressed in range and cross-range as I(r,c)=minωHRω, where ω is a weighting vector and R is a covariance matrix of the image data. A solution for I(r,c) is approximated by i) forming Y=[x1 . . . xK]T/{square root over (K)} where x1 . . . xk are beamspace looks formed from image domain looks and with y1, y2, and y3 denoting the K×1 columns of Y; ii) computing r21=y2Ty1 and r31=y3Ty1, and b=r21y2+r31y3; computing γ as γ = min ⁡ ( r 21 2 + r 31 2 b T ⁢ b , β - 1 r 21 2 + r 31 2 ) ; and iii) computing I(r,c) as I(r,c)=∥y1−γb∥2.

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