Design of Warship Target Recognition System Based on Fundamental Frequency Extraction
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摘要: 随着高性能扫雷具等干扰目标的不断涌现, 为了区分舰船目标和扫雷具目标, 研究了一种舰船基频提取方法。该方法利用舰船基频在信号的低频段存在多次谐波的特点, 通过计算信号低频段的功率谱, 提取低频段存在的线谱, 并利用差频估计算法提取信号存在的基频信息。通过对大量实测数据的分析, 总结了扫雷具与舰船目标在低频段功率谱中存在的不同特征, 利用这些特征改进了差频估计算法, 并在数字信号处理上实现了相关的线谱提取方法和改进的差频估计算法, 设计了一个舰船基频提取系统。经过试验验证, 该系统能够有效区分舰船目标与干扰(扫雷具)目标, 且功耗很低, 识别算法全速运行时仍小于100 mW。Abstract: With the development of minesweeping gear technology, we present a fundamental frequency extraction method of a warship according to the difference between the low-frequency power spectrums of warship and minesweeping gear in order to distinguish a warship target from a minesweeping gear. Considering these factors, we use ultra-power devices OPA378, ADS7951 and TMS320VC5509A to design a fundamental frequency extraction system of warship with low power, quickness and real time. This system uses difference frequency algorithm to estimate target base-band. Experiments verify the stability and reliability of the system.
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