The practice proved that the filter could realize system identifying and noise removing and achieve the effect of improving quality and increasing distance of underground communication.
实践证明该滤波器较好地实现了系统识别和噪声消除，能够达到改善井下通信质量、增加井下通信距离的效果。
There's been no communication with the miners since an underground explosion, and there are concerns about the threat of poisonous gases.
自从发生煤矿爆炸以来，救援人员没有和被困矿工联系，而是更加关注的是有毒气体的威胁。
An intelligent inducing ventilating control system of underground garage was composed of many inducing ventilating controllers, RS-485 communication network and PC monitor modules.
地下车库的智能型诱导通风控制系统由多个诱导风机控制器、RS- 485通信网络及PC监控模块组成。
Also the solutions for mobile communication technology at surface ground can be fully to solve the wireless communication problems in underground mine.
同时指出，陆地移动通信技术解决方案完全可以解决煤矿井下无线通信难题。
Metro stray current causes serious electrochemical corrosion in the metal pipelines, communication cable epidermis and rebars in concrete main structure buried underground nearby metro.
杂散电流对地铁周围的埋地金属管道、通讯电缆外皮以及地铁主体结构钢筋等发生电化学腐蚀，产生严重的危害。
A digital communication system is introduced to replace analog system used in underground locomotive carrier communication system.
提出了在架线电机车载波通信系统中，用数字通信取代模拟通信方式。
Introduced some new type underground mobile communication system, such as leakage communication system, distributed antenna communication and region mobile communication, etc.
介绍了多信道漏泄通信系统、分布天线通信系统和小区制移动通信系统等一些新型矿井移动通信系统。
Metro stray current causes serious electrochemical corrosion in metal pipelines, communication cable epidermis and rebars in concrete main structure buried underground nearby metro.
杂散电流对地铁周围的埋地金属管道、通讯电缆外皮以及地铁主体结构钢筋等发生电化学腐蚀，产生严重的危害。
At present, we use wire communication underground coal mine in our country. Information is transmitted by electric cable. When the accident happened, the communication is discontinued at once.
目前我国煤矿井下通讯基本上是有线装置，依靠电缆传输信息，一旦发生事故，通信马上中断。
The paper introduces the working principle and structure of a new communication tested device for underground outstations. It also discusses some key techniques and software design of this device.
介绍了一种新型井下分站通信测试装置的工作原理及结构，并对该装置的一些关键技术和软件设计进行了讨论。
The mine MF inductive communication system is analysed and studied, and a new type of MF digital inductive communication system underground is proposed in this paper.
分析与研究矿井中频感应通信系统，并提出了一种新型的矿井中频数字感应通信系统。
Provide productions including refrigerating units, air coolers, coal mine safety monitoring system, underground person-location and management system, and underground wireless communication system.
生产和销售井下制冷机组、空气冷却器；煤矿安全监控系统及其传感器；井下人员管理系统；井下无线通信系统。
The utility model relates to a mini-size push bench for underground pipe laying, which belongs to communication construction technical field.
本实用新型涉及一种用于地下铺设管道的微型顶管机，属于通信施工技术领域。
Medium frequencies and horizontal magnetic dipoles (vertical loop antennas) can be used in underground radio communication in mining sections of coal mines.
中频频率和水平磁偶极子天线(垂直环状天线)是井下采区无线通信可使用的频段和天线型式。
The article describes the general rules and relevant measures for crisscross of communication cable ducts and other underground lines.
本文介绍了通信电缆管线与其他专业地下管线交越的一般原则和具体情况应对措施。
The article describes the general rules and relevant measures for crisscross of communication cable ducts and other underground lines.
本文介绍了通信电缆管线与其他专业地下管线交越的一般原则和具体情况应对措施。
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