High Precision Multifrequency Acoustic Radar with an Unequally Spaced Frequency Array Designed by Simulated Annealing

概要

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Multifrequency cw radar with a frequency array is realized by digital signal processing. However, the resolution is limited to the fundamental sampling spacing determined by the aperture width of the frequency array. Furthermore, it has a periodic structure with a usually used equally spaced frequency array which results in the formation of periodic ghosts of an object. These fandamental problems are shown to be solved by the introduction of an unequally spaced frequency array (USFA) and a linear phase interpolation of the reconstructed impulse response between the fundamental sampling points. Art amplitude-weighted USFA, which has minimized grating lobes, is designed by the method of simulated annealing from a previously described uniformly weighted USFA. The original level of the grating lobes is as large as -8.93 dB, and the minimized level is -12.5 dB. The resolution is not degraded by the minimization, and a superresolution of 1/60 to 1/300 of the wavelength is maintained.
社団法人応用物理学会の論文
1997-05-30