Two-way Automatic Communication System Research Articles

모바일 인스턴스 메신저를 이용한 양방향 자동화 통신 시스템 설계

In this paper, we design and implement a two-way automatic communication system using a mobile instant messenger that can provide a customized service through a real-time two-way communication using a mobile instant messaging service. Two-way automatic communication system using a mobile instant messenger can improve the quality and quantity of information in real-time update of the information through the feedback. In addition, since it is communicated by using a mobile Instant Messanger in 1:1 there is no concerns that is recognized as spam, as well as it is possible to provide customized information for each user. Two-way automatic communication system using a mobile instant messanger shows the difference of the speed according to the data input time in typing by hands in result of comparing the time to input a date and the processing speed to search a data. Therefore in category treatment, command processing and natural language processing, Category treatment way is the most excellent in aspect of data processing speed, otherwise in aspect of the total speed to combine the data input time and the processing time, the command processing way is the best method.

Research on Communication Circuit Applied in Street Lamp Control System

Taking the power distribution network situation in China into consideration, this paper proposes a communication circuit applied in street lamp control system. It first summarizes the overall design scheme of the control system. And then it demonstrates the high reliability of outbound Two Way Automatic Communication System (TWACS) within one transformer area and the low-cost characteristics of corresponding circuit. Finally, it proposes the design scheme of the communication circuit which can process Power Line Carrier communication (PLC) signals and outbound TWACS signals simultaneously, and it is based on single MCU. This design scheme is conducive to improving the communication efficiency and success rate of the street lamp control system to a great extent.

A Remote Monitoring System of Water Injection well Based on TWACS

This paper develops a remote monitoring system of water injection well based on TWACS (Two Way Automatic Communication System), the system is comprised of remote monitoring terminal, communication master station and water injection well data back-stage management center. This system, which is based on TWACS, can realize the datas remote multi-channel parallel transmission and monitoring. Through the field experiment shows that the system has a small investment and no signal blind area, it is well suited in oilfield distribution.

Research on TWACS Interference Suppression Based on the RLS Algorithm

TWACS (Two Way Automatic Communication System) has advantages such as economical and practical use, strong interference capability, long transmission distance and so on. But the noise in China's industrial distribution power grid owns the characters of strong interference randomness and even annihilation of the modulated signal. So the noise has a negative impact on power line communication performance. While the adaptive filter does not need to know in advance on the statistical characteristics of the input signal and noise, and has nothing to do with the spectral characteristics of the input signal. Based on this, it’s premised that the modulation signal is basically known, and the signal beyond modulation domain is regarded as reference signal to design an adaptive filter applied to TWACS by referring to the block diagram of the adaptive filter model to adjust the variable parameters of the RLS algorithm. Finally, the field test signal simulations show good effect of the adaptive filter design

The Signal Detection in TWACS Based on IIR Filter

Two-way Automatic Communication System (TWACS) eliminates most of harmonic and noise interference from power network by way of the time-domain difference technology. Then the modulating signal is demodulated by judging the direction of it. In order to improve the communication performance, this paper puts forward a method to reduce the electric network noise in the difference signal based on IIR band-pass filter. The variation of the cross correlation coefficient of detection signal and reference signal can reflect the improved results. The analysis and comparison of field measured signal have shown that this method is much more reliable than the traditional method.

A TWACS system alarm function for distribution automation

A new application designated as the "System Alarm Function" is made possible by using the "Unsolicited Inbound" capability recently developed for the Two Way Automatic Communication System (TWACS) System-10, which is already used by several electric utilities in the USA for demand side management, remote metering and distribution automation is reviewed here. The "Unsolicited Inbound" algorithm development, the operational issues that are pertinent to the understanding of collisions between multiple alarms and the effects on the "alarm response time" are discussed in detail. This master-to-master relationship between remote transponders in the distribution network and the central control computer opens the door to multiple functional capabilities in the area of distribution automation and remote monitoring.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

TWACS, A New Viable Two-Way Automatic Communication System for Distribution Networks. Part I: Outbound Communication

A new concept of two-way automatic communication for distributed systems, henceforth abbreviated as TWACS??, is introduced in this paper. This paper restricts itself to the discussion of inbound signalling from the remote transponder units at the customer's premises to the receiver located at the substation. Inbound signalling uses current pules, precisely generated and limited to only a small segment of a half cycle of the 60 Hz wave. The inbound signal is detected in the neutral or phase bus conductor at the substation. Bit coding, multichannel assignment, detection algorithms and propagation characteristics are explained and discussed and the paper concludes with field results obtained at many different utilities. A previous companion paper [1] presents the basic functions and features of TWACS?? and describes outbound communication. This paper focuses on TWACS?? inbound communication and presents the subject as follows: ??? general description of TWACS?? inbound communication technology, ??? signal generation and propagation, ??? signal detection, ??? bit coding and multichannel signalling, ??? noise characteristics, ??? error correction and detection, ??? field experience. Using a block diagram of a typical TWACS?? installation, the operation, synchronization and performance of inbound communication is introduced. Inbound signals are generated by drawing current pulses at the remote transponder units. The actual transmitter consists of a low impedance load inductor and a pair of anti-parallel connected SCRs in parallel with the 240 V line. By limiting the on time of the SCRs the amplitude and duration of the current pulses can be controlled.

TWACS, a New Viable Two-Way Automatic Communication System for Distribution Networks Part I: Outbound Communication

TWACS, a New Viable Two-Way Automatic Communication System for Distribution Networks Part I: Outbound Communication