| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To precisely detect, out of radar reception signals which are a mixture of target signals and unnecessary signals whose frequencies vary to substantially the same extent, only the target signals. <P>SOLUTION: A method comprises: acquisition of a frequency spectrum by converting radar reception signals into a frequency range (step S11); modeling the acquired frequency spectrum with a sum of the density function of each echo group (mixed density function) (step S12); parameters of the mixed density function are presumed by learning an optimal values thereof (step S13); and calculation of the average Doppler frequency, spectral width and electric power for reception from the presumed parameters and outputting the calculated results as observation findings (step S14). The modeling includes fitting of the frequency spectrum of the echo groups to the mixed density function, the degree of fitness is evaluated according to a likelihood function with penalty, and the penalty term of the likelihood function uses at least one of the electric power for reception of a single echo, the Doppler frequency and the spectral width all measured in advance. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
