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    • 8. 发明专利
    • TOPOGRAPHY AVOIDING RADAR APPARATUS MOUNTED ON AIRPLANE
    • JPH02168185A
    • 1990-06-28
    • JP32435388
    • 1988-12-22
    • MITSUBISHI ELECTRIC CORP
    • TAKECHI KENICHI
    • G01S7/02G01S13/44G01S13/935
    • PURPOSE:To detect an obstacle present above a specific altitude with high accuracy by detecting the actual angle-of-elevation value of clutter from the signals of a sum pattern SIGMA and a difference pattern DELTA according to a monopulse system and comparing the same with the angle-of-elevation value at the specific altitude. CONSTITUTION:A transmission wave is emitted in an altitude and distance direction detecting an obstacle from a phased array antenna and the reflected wave is received by the antenna 1 to prepare a receiving signals of a sum pattern SIGMA and a difference pattern DELTA in a monopulse comparator 3. The receiving signals of the patterns SIGMA, DELTArespectively pass through a mixer 10 to be digitalized by A/D converters 14. Operation is performed at the distance of clutter detected by a measuring device 19 according to a predetermined formula and the angle of elevation of the clutter is detected from the angle of elevation of an antenna bore sight axis according to a predetermined formula. The specific altitude where the obstacle is detected at the distance of the clutter detected by a clutter detector 18 and the angle of a radar platform with a horizontal direction are calculated. By an obstacle detector 21, the angle of elevation detected by the measuring device 19 is compared with that at the specific altitude calculated by an angle-of-elevation detector 20.