扩频编码电法探测实验研究

【目的】输电线路下采空区易引起地表沉降严重威胁电力设施的运行安全。输电线路下采空区电磁环境复杂,传统探测方法发送频率单一、抗干扰能力差、大功率探测仪器笨重难以适用于输电线路下采空区检测。【方法】借鉴通信领域扩频编码技术,对发射信号频率进行扩宽处理并结合扩频相关算法,利用设计的扩频编码电法探测系统进行了水槽抗干扰实验以及强干扰环境下的外场地下空洞检测实验。【结果】结果表明,扩频编码电法探测方法有较强的抗干扰能力,能够在强干扰情况下获得较好的探测效果,提高探测的准确度。【结论】本文的研究验证了扩频编码探测方法去除干扰的有效性,可以为复杂电磁环境下的电法探测提供一种行之有效的方法,为输电线路下采空区的检测提供参考。

Experimental Research on Electric Detection with Spread Spectrum Coding

[Introduction] The goaf under transmission line is easy to cause surface subsidence and threaten the operation safety of power facilities. The electromagnetic environment of goaf under transmission line is complex. The traditional detection methods which have the characteristics of single transmission frequency, poor anti-interference ability and heavy power detection instruments, are difficult to apply to detect goaf under transmission line. [Method] Based on the spread spectrum coding technology in the field of communication, the transmitted signal frequency is widened and the spread spectrum correlation algorithm is combined. Using the designed spread spectrum code electrical detection system, the anti-interference experiment of flume and the detection experiment of underground cavity in outfield under strong interference environment are carried out. [Result] The results show that the spread spectrum code electrical detection method has strong anti-jamming ability, and it can obtain better detection effect and improve the detection accuracy in the case of strong interference. [Conclusion] This study verifies the effectiveness of the spread spectrum coding detection method in removing interference. It can provide an effective method for electrical detection in complex electromagnetic environment and provide references for goaf detection under transmission lines.