基于Matlab的伪随机扫描信号的仿真与研究

Simulation and Research of Pseudo-random Sweeping Signals Based on Matlab

针对可控震源扫描信号的要求和伪随机序列的特点,提出了一种基于Matlab的伪随机扫描信号的设计方法,该方法是将生成的长时间M序列通过频谱整形的方法,形成频带限制、自相关性良好的伪随机扫描信号。在Matlab平台上完成了扫描信号的仿真实验。仿真结果表明,伪随机扫描信号的自相关性良好,信号的相关噪声、扫描时间和频带宽度均满足可控震源的要求。

A method of the design of pseudo-random sweeping signals base on spectral shaping was presented according to the requirements of vibroseis and the characteristics of pseudo-random sequence.The M-sequence was filtered by the method of spectral shaping to form pseudo-random sweeping signals which is band-limited and good for correlation.The Simulation of pseudo-random sweep signals is completed on the Matlab platform.The results show that the autocorrelation of pseudo-random sweeping signals is good,the related noise of signals,scanning time and bandwidth of sweeping signals are all able to meet the requirements of vibroseis.