一种水下电磁测距的新方法

基于电磁波在海水中传播时产生的传播衰竭和传播相移随距离变化的对应关系，提出了将接收的电磁信号的幅度与相位分离处理后利用相位特征量进行比相测距的新方法，还进一步讲座了预先确知信号条件下采用直接比相测距，任意信号条件下采用间接比相测距的两种方式，通过推算与水池试验的验证，利用电磁辐射源在水下运行时伴随的传播相移不仅可以实现单站被动测距，并且可以获得较高的距离分辨率与测距精度。

A New Method for Underwater Electromagnetic Passive Ranging

Based on the attenuation and phase shifting as function of propagation range of underwater electromagnetic wave, the new ranging method with the phase ratio picked out from receiving signals is proposed. Two ways, the direct range is made use of on the foresight signal and the indirect range is made use of on the arbitrary signal by the phase ratio, are discussed. Verified through the underwater test in a lab pool after calculation, the underwater electromagnetic passive range measuring via single station not only can be brought into practice, but also the better distance resolution and range precision can be acquired to make use of the propagation phase shift of the signal which is radiated by moving target.