QIU Zu-rong1， ZHANG Qi1， LI Hong-zhi2， ZHANG Xiao-wei2
（1. School of Precision Instrument and Optoelectronic Engineering, Tianjin University, Tianjin 300072, China； 2. National Ocean Technology Center， Tianjin 300112, China）
Abstract： Inductive coupling transmission system is an important measurement device for acquiring and transmitting marine environmental information. However, low transmission rate cannot meet the current demand for large data transmission in marine environment detection at home. In order to improve the transmission performance of the system in practical communication system, optimizing the design by directly changing the circuit parameters is time-consuming and expensive. Therefore, a set of inductive coupling transmission channel analysis system is designed based on virtual instrument to improve the transmission rate and reliability of inductive coupling transmission system. The bit error rate of channel system at different frequency and noise levels are tested by using three kinds of digital modulation mode including amplitude shift keying (ASK), frequency shift keying (FSK) and differential phase shift keying (DPSK), taking square wave and sine wave as a carrier. Finally, the sine wave is selected to be carrier signal and DPSK is chosen to be modulation mode. The reliable transmission of signal with the error rate less than 0.005 and the transmission rate of 9 600 bps, at the noise level of -10 dB, is realized and verified by the debugging circuit experiments with multi-nodes in the laboratory. The study provides an important experimental evidence for improving signal transmission reliability of inductive coupling transmission system.
Key words： inductive coupling transmission; transmission rate; virtual instrument; modulation and demodulation
CLD number： TN911 Document code： A
Article ID： 1674-8042（2018）04-0360-07 doi： 10.3969/j.issn.1674-8042.2018.04.009
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基于LabVIEW的感应耦合信道分析系统设计
裘祖荣1， 张 琪1， 李红志2， 张孝薇2
（1. 天津大学 精密仪器与光电子工程学院， 天津 300072； 2. 国家海洋技术中心， 天津 300112）
摘 要: 感应耦合传输系统是测量深海数据的重要设备， 因其传输速率低而无法满足海洋大数据量传输的需求。 在实际通信系统中， 通过改变电路参数直接进行优化设计， 从而提高系统的传输性能， 此方法耗时长、 成本高。 本文设计了一套基于虚拟仪器的感应耦合传输信道分析系统以提高传输系统的传输速率和可靠性。 分别测试了采用方波和正弦波作为载波， ASK/FSK和DPSK三种数字调制方式在不同频率和噪声量级下信道系统的误码率， 最后确定采用正弦波作为载波信号， 采用DPSK调制方式， 其误码率低于0.005， 实现了9 600 bps传输速率下的可靠性传输， 并在实验室的多节点板极电路调试中得到了验证。 这一结果为提高感应耦合传输系统的传输速率和稳定性提供了重要的实验依据。
关键词: 感应耦合传输； 传输速率； 虚拟仪器； 调制解调
引用格式： QIU Zu-rong， ZHANG Qi， LI Hong-zhi, et al. Design of inductive coupling channel analysis system based on LabVIEW. Journal of Measurement Science and Instrumentation, 2018, 9(4)： 360-366. ［doi： 10.3969／j.issn.1674-8042.2018.04.009］
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