| 摘要 |
PROBLEM TO BE SOLVED: To quickly and accurately calculate a pulse repetition interval being generated by a radar by using pulse arrival time (TOA) for plotting, and by extracting a part where obtained intersection information is dense. SOLUTION: At a TOA intersection calculation part 2, based on the TOA of a reception signal being accumulated by a TOA accumulation part 1, plotting processing is made for obtaining an intersection. More specifically, first TOA (TOAI1), is plotted to an X axis, a line parallel to a Y axis from the TOA1 to a vertical upper part, and an azimuth line with an inclination of -1/n (n=1, 2, and 3) are drawn, and second and third TOAs also execute plotting for obtaining the intersection of each perpendicular and the azimuth line. A value on the Y axis corresponding to the crowded part of each intersection where each intersection is projected onto the Y axis becomes PRI of the TOA. After entire intersection is calculated, an intersection accumulation part 3 accumulates merely Y coordinates for creating a histogram, and detects the crowded part on the Y coordinates. After that, a dense point calculation part 4 calculates a value (RPI) of the Y axis with the maximum density from histogram data.
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