公开(公告)号：US20150229382A1

公开(公告)日：2015-08-13

申请号：US14286137

申请日：2014-05-23

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seung Yong LEE ,  Hyung Joo KIM ,  Dae Seung YOO ,  Kyong Hee LEE ,  Gwang Ja JIN ,  Byung Tae JANG ,  Dong Sun LIM

IPC: H04B7/08 ,  H04B7/04 ,  H01Q1/24

CPC classification number: H04B7/082 ,  H01Q1/34 ,  H01Q3/26 ,  H01Q21/29 ,  H04B7/0404 ,  H04B7/0808 ,  H04B7/0814

Abstract: An antenna switching system according to an exemplary embodiment of the present invention includes a plurality of directional antenna which is mounted in a ship to receive a wireless signal; an antenna switch which selects one of the plurality of directional antennas; a modem which is connected to the directional antennas through the antenna switch to extract a strength of a received signal; and a switching determining unit which outputs an antenna selection signal to the antenna switch based on the strength of the received signal and GPS/DR information of a transmission side ship and its own ship.

Abstract translation: 根据本发明的示例性实施例的天线切换系统包括安装在船舶中以接收无线信号的多个定向天线; 天线开关，其选择所述多个定向天线中的一个; 调制解调器，其通过天线开关连接到定向天线以提取接收信号的强度; 以及切换确定单元，其基于接收信号的强度和发送侧船舶及其自己的船舶的GPS / DR信息，向天线开关输出天线选择信号。

公开(公告)号：US20170150315A1

公开(公告)日：2017-05-25

申请号：US15359183

申请日：2016-11-22

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seung Yong LEE

IPC: H04W4/02

CPC classification number: H04W4/023 ,  H04W4/021 ,  H04W4/029

Abstract: Provided is a system for tracking locations of workers. In the system, a first mobile terminal of a first worker located in a coverage area of an anchor node may perform wireless communication with the anchor node to operate in a tracking mode of tracking a location of the first worker, and a second mobile terminal of a second worker located outside the coverage area of the anchor node may perform wireless communication with the first mobile terminal entering a virtual perimeter to track a location of the second worker.