Narrow-Scope Searching FrFT Method Applied in the Elimination of Sonar Ranging Error
Keywords:
Active sonar, error elimination, fractional fourier transform (FrFT), linear frequency modulation (LFM) and parameter estimation.Abstract
For the question that the computation of
searching peak is large in signal parameters estimation using
FrFT method, a new method of narrow-scope searching FrFT
is proposed in this paper. According to the possible speed
range of the target’s motion, the change range of received LFM
signal’s parameters caused by Doppler Effect can be predicted.
By estimate the FrFT optimal order in a very small range
accurately, the search scope and computation amount will be
greatly reduced. And this method was successfully applied to
eliminate the active sonar ranging error. Theoretical analysis
and simulation have confirmed small operation amount, high
accuracy and good real-time performance for this presented
method.
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