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.
Index Terms— Active sonar, error elimination, fractional fourier transform (FrFT), linear frequency modulation (LFM) and parameter estimation.
Yongshou Yang, Shiliang Fang, and Shuai Yao are with Southeast University, Nanjing, 210096 China (e-mail: ysyang@seu.edu.cn).
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Cite: Yongshou Yang, Shiliang Fang, and Shuai Yao, " Narrow-Scope Searching FrFT Method Applied in the Elimination of Sonar Ranging Error," International Journal of Information and Electronics Engineering vol. 4, no. 5, pp. 384-388, 2014.
