野战有线通信系统二线全双工接口测试电路设计

野战有线通信系统全双工接口在单对线上同时收发信号,难以直接进行数据采集和测试。针对上述问题,研究了一种基于收发分离和自适应回波抵消的二线全双工接口测试方法。首先,设计电子收发分离器,实现线路上收发信号的隔离；然后,使用自适应回波抵消器,完成了近端回波干扰信号的抵消；最后,借鉴软件无线电技术和存储测试技术,构建测试系统,实现激励信号生成与数据采集。仿真和实验表明,该测试方法能够实现有效完成收发信号隔离以及回波干扰信号抵消,适用于野战有线通信系统二线全双工接口测试。

Design of an Interface Testing Circuit for Two-wire Full-duplex Field Wired Communication System

In the Field Wired Communication System, the two-wire full-duplex Communication interface can synchronously transmit both the transmission signal and the received signal on a single pair wire. Consequently, it is difficult to collect the received signal. A new method of two-wire full-duplex interface testing is proposed based on receive/send conversion and adaptive echo offset technique. Firstly, a receive/send conversion circuit is designed to implement the isolation on the line transmission and reception. Secondly, Digital adaptive filtering techniques are used to eliminate line hybrid network balance impedance mismatch errors due to canceling the interference signal of near-end echo. Finally, an interface testing system is constructed based on software radio technology and storage testing technology. The results of simulation and experiments show that the method is feasible for interface testing of two-wire full-duplex communication.