On the Singular Spectrum of the Radiation Operator for Multiple and Extended Observation Domains

Figure 5

Two observation domains that subtend the same angular sector for the case of 𝑋_𝑠=50𝜆, 𝑋₁=20𝜆, 𝑋₂=50𝜆, 𝑧₁=240𝜆, and 𝑧₂=600𝜆. Comparison between the squared singular values of the radiation operator (denoted as actual) and the eigenvalues of the approximate model given by (25) (denoted as approx.).