超长波磁场接收天线磁致伸缩噪声研究

On magnetostrictive noise of super low frequency H-field receiving antenna

研究了海水中超长波拖曳磁场接收天线在地磁场中产生磁致伸缩噪声的机理,导出了计算磁场拖曳天线磁致伸缩噪声功率谱的理论公式,分析了天线灵敏度、电缆特性、地磁场等因素对磁致伸缩噪声的影响。用理论公式对拖曳天线磁致伸缩噪声电压进行了实例计算。试验测试结果表明,计算曲线与测量曲线基本一致,证明了理论公式的正确性。

An analysis was made of the mechenics of magnetostrictive noise generated by an underwater super low frequency towed H-field receiving antenna in the geomagnetic field. The theoretical for- mulas were deduced for calculating the power spectrum of the magnetostrictive noise for both the sub- marine towed electrode-pair antenna and magnetic field antenna. The research dealt with the various contributing factors, such as antenna sensitivity profile, cable properties, geomagnetic field. An example for calculation was given to calculate the magnetostrictive noise voltage by using the theoretical formulas. The experimental result shows that the predicted noise voltage level agrees well with ex- perimentally measured noise data and that the formulas are proved to be correct.