基于接地天线的超低频信号全向辐射方法

为了解决超低频无线电信号辐射效率极低的难题，采用接地天线辐射超低频信号。由于接地天线辐射具有方向特性，使用一副接地天线对在不同海域里的水下机动平台进行水下通信时，通信可靠性不能得到保证。因此，提出了接地天线全向辐射超低频信号的方法。该方法首先构建两副相互垂直的接地天线以组成天线阵，然后通过精确地控制组成天线阵的两副接地天线输入电流的相位差，使天线阵在水平各方向上辐射的合成电场均匀一致，从而实现了超低频信号全向辐射。该方法能显著提高超低频通信的可靠性，最适合超低频对水下通信和对水下机动平台通信。在目前众多的超低频发射天线设计方案中，采用该方法构建的天线阵尺寸最小，效率最高，且简单、易于实现全向辐射，这对于推广超低频无线电信号在其他领域的应用是具有重要意义。．

Method of SLF signal omni-directional radiation based on grounded antenna

In order to solve the problem of extremely low radiating efficiency for SLF radio signal, the grounded antenna is used to radiate SLF signal. Because the grounded antenna has the directivity of radiation, the realibility of communication can not be guaranteed when a set of grounded antennas is used for communication between underwater mobile platforms in different waters. Therefore, a method of omni-directiona radiation of SLF signal is presented. According to this method, two sets of grounded antennas which are orthogonal are built to forma SLF antenna array. After that, by controlling the phase difference of the input current of two antennas accurately to make the synthetic electric field radiaded by the antenna array in all horizontal directions to be equal and uniform, so that the SLF signal omni-directional radiation is realized. This method can significantly improved the reliability of SLF communication, is suitable for SLF communication to underwater mobile plat- form. Among all the existing design schemes of SLF transmitting antennas, the antenna array that is built by this method has the smallest size and the highest efficiency. It is simple and easy to realize SLF signal omni-directional radiation.