摘要
为了解决传统电磁探测方法依赖加大发射功率提高信噪比，造成仪器笨重，不利于野外探测等问题，本文借鉴通信领域扩频编码技术，利用伪随机序列对发送信号进行扩宽处理，以在小功率下获得较强的抗干扰能力，分析了m序列、Gold序列和2^n序列3种常见的伪随机序列的特点和相关性，并利用MATLAB进行相关性和辨识方面的仿真研究。结果显示m序列所得辨识结果与原脉冲响应原形基本吻合，Gold序列和2^n序列吻合度较差，表明m序列相较于其他两种序列在电磁探测中辨识效果更好。
Traditional methods for electromagnetic detection rely on increasing the transmission power to improve the signal to noise ratio, resulting in heavy equipment is not conducive to field detection and other issues.In order to solve these issues, the spread spectrum coding technique in the communication field was used to widen the transmission signal to obtain a strong anti-interference capability at low power. The features and correlations of three common pseudorandom sequences such as m sequence, Gold sequence and 2n sequence were analyzed, and the correlation and identification were simulated with MATLAB.The results showed that the identification of m sequence is consistent with the original impulse response, and Gold sequence and 2n sequence are poor, which indicates that m sequence is better than other two sequences in the electromagnetic detection.
出处
《现代科学仪器》
2017年第1期75-80,共6页
Modern Scientific Instruments
基金
国家自然科学基金项目（51307164）和国家电网公司科技项目（52053015000P）.
关键词
输电线路
电磁探测
伪随机序列
相关辨识
MATLAB仿真
Transmission line
Electromagnetic detection
Pseudo-random sequence
Correlation identification
MATLAB simulation
