水下电磁探测系统抗干扰频谱感知技术研究

Study on Anti-Jamming Spectrum Sensing Technology for Underwater Electromagnetic Detection System

复杂电磁环境中水下电磁探测系统工作带宽较窄，容易受到系统内部和外部干扰的影响；针对以上问题，提出一种基于多分辨率频谱感知的抗干扰频谱感知技术；采用多分辨率频谱感知算法量化采样信号频带中各频点能量，利用基于连续均值切除算法中的双门限法计算门限阈值，根据各频点能量的量化结果判决该频段内的频谱空洞；O～5kHz内的频谱感知仿真结果显示，相同信噪比下，感知间隔越小，感知准确度越高。

Underwater electromagnetic detection system （UEDS） is susceptible to internal or external interference in a complex electro magnetic environment because of its narrow working bandwidth. In view of that problem, an anti jamming spectrum sensing method based on multiresolution spectrum sensing （MRSS） was proposed. The MRSS was used to quantify the energy of each frequencypoint in the frequency band of the sampled signal. The threshold values were calculated by doublethreshold method based on forward consecutive mean excision algorithm. The spectrum holds in the working spectrum were judged according to the quantifying results at each frequency point. The simulation results of spectrum sensing between 0-5kHz show that a smaller sensing step results in a higher detection probability in the same signal noise rate （SNR）.