16号数据链中导航与定位的同步方法

Synchronization Mechanism for Navigation and Location in Data Link16

16号数据链中导航与定位,硬件可采用TOD法,即参与单元(JU)内部都固化一时钟且统一校准。软件通过发送往返计时报文(RTT)使JU间获得时间的精同步,再根据报文传送时间调整自己时钟。其步骤分为:初始网络登录、粗同步、细同步及同步保持。细同步后,按JU消息到达时间推算出JU间的距离,并将各JU置于统一坐标系中定位。计算出其他单元的相对位置,完成导航。提高定位精度则采用人工神经网络方法。

The navigation and location in data link16 is realized with two ways, one is TOD for the hardware, and by this way, the standard time is embedded on every JU. The other way is introduced as follows： its fine synchronization of time is gained by JU through receiving RTT, and adjusts its own time according to the duration fine sent and received the message. All this process is indicated into network entry; coarse synchronization; fine synchronization and synchronization maintenance. After finished fine synchronization, the distances between JUs were computed according to arrival time of the message, and all JUs were located in the uniform coordinates. The other Jus＇ relative positions were computed, and the navigation was accomplished. ANN is referred to improve the precision of location.