A joint range/radial velocity estimation method based on Fractional Fourier Transform (FRFT) of underwater target was developed for active SONAR/RADAR. The FRFT of linear frequency modulated signal was given, and the relationship between the real signal parameter and the generalized parameter of discrete computation was shown. During discrete computation, the scaling was involved. And further, the FRFT of pulse signal was derived. The joint estimated radial velocity and range were proposed and derived, which are closely related with the location of maximum FRFT spectrum of echo. The simulation data and the measured data of water tank were used to demonstrate that the new approach can use one pulse (positive or negative LFM) simultaneously to estimate target range and radial velocity . At last, the sensitivity of estimated parameters was discussed.
Key words
information processing /
fractional fourier transforms /
linear frequency modulation /
radial velocity /
time delay /
chirp rate /
sensitivity
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