Range Doppler imaging, a basic method used in inverse synthetic aperture radar (ISAR), is based on the uniform rotation model of a target. The rotation velocity and axis of a maneuvering aircraft often vary with time. Traditional imaging methods may blur the target image and even render it beyond recognition- A concept is presented for range-instantaneous Doppler imaging and a corresponding imaging method that can clearly improve the image quality of most maneuvering aicraft.The resulting images of real data show that the method is effective. #1998 Society of Photo-Optical Instrumentation Engineers. S0091-3286(98)02605-1］ Subiect terms: inverse synthetic aperture radar; maneuvering target. Paper 39037 received Mar. 24, 1997; revised manuscript received July 23,1997; accepted for publication Dec. 1, 1997.
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