伪随机信号抗干扰理论及其在激电仪中的应用研究
发布时间：2018-10-09 09:07
【摘要】：伪随机信号抗干扰理论基于相关辨识法,通过单位脉冲响应与激发极化法联系起来,从而实现在电法勘探中的抗干扰应用。本论文从时域和频域两个角度讨论伪随机信号抗干扰原理,并定量地分析影响辨识精度和抗干扰性能的参数选择标准;使用MATLAB和Multisim等仿真软件,结合RC阻容电路和地电系统两个仿真算例进行系统辨识和抗干扰仿真;研制一套伪随机激电仪器样机,并设计若干实验对仪器和方法进行验证。在相关辨识和抗干扰的理论推导部分,基于卷积、相关运算和最优化准则推导出维纳-霍夫方程,介绍伪随机m信号的时域、相关和频域特性,并讨论由相关运算的数据求解单位脉冲响应的方法。论文将时域的系统辨识过程分解为四个具体的步骤,每个步骤都有对应的频域分析。通过伪随机m信号时域特性和频域特性对相关辨识的抗干扰原理进行解释。在系统仿真部分,充分利用MATLAB高效的数值运算特点,选择具有解析公式的RC阻容电路和地电系统作为仿真系统,从无干扰和有干扰的角度进行了系统全过程的仿真。论文还介绍了两种评价抗干扰性能的指标,功率信噪比增益和噪声方差增益,定量评价伪随机信号抗干扰性能。本论文研制一套伪随机激电仪器样机,包括发送机和接收机。发送机可以发射常规的时域和频域激电的波形,也可以发射伪随机m信号波形;接收机可以用于常规激电法和伪随机抗干扰电法的数据采集工作。系统使用SD卡作为存储介质,采集全时域的波形数据;采用GPS和线同步方式,实现发送机和接收机协同工作;使用无线蓝牙和RS232实现人机交互。论文还设计了三类实验,即RC电路实验、水槽实验和野外实验。通过多次的仪器实验,验证了该仪器系统的实用性;通过MATLAB进行数据处理和分析,验证了伪随机信号抗干扰理论的科学性。
[Abstract]:The anti-jamming theory of pseudo-random signal is based on the correlation identification method and the unit pulse response is connected with the excited polarization method to realize the application of anti-jamming in electrical exploration. This paper discusses the anti-jamming principle of pseudorandom signal from two angles of time domain and frequency domain, and quantitatively analyzes the parameter selection standard which affects the identification accuracy and anti-jamming performance, and uses the simulation software such as MATLAB and Multisim, etc. Combined with two simulation examples of RC resistive circuit and geoelectric system, the system identification and anti-interference simulation are carried out, a set of pseudorandom IP instrument prototype is developed, and some experiments are designed to verify the instrument and method. In the theoretical derivation of correlation identification and anti-jamming, based on convolution, correlation operation and optimization criterion, the Wiener Hoff equation is derived, and the time domain, correlation and frequency domain characteristics of pseudorandom m signal are introduced. The method of solving the unit pulse response from the data of correlation operation is also discussed. In this paper, the system identification process in time domain is decomposed into four specific steps, each of which has a corresponding frequency domain analysis. The anti-interference principle of correlation identification is explained by time domain characteristic and frequency domain characteristic of pseudo random m signal. In the part of system simulation, RC resistive circuit with analytic formula and geoelectric system are selected as simulation system, which make full use of the high efficiency numerical operation characteristic of MATLAB. The whole process of the system is simulated from the point of view of non-interference and interference. The paper also introduces two indexes to evaluate the anti-jamming performance, power signal-to-noise ratio gain and noise variance gain, and quantitatively evaluate the anti-jamming performance of pseudo-random signals. A set of pseudorandom ionization instrument prototype, including transmitter and receiver, is developed in this paper. The transmitter can transmit conventional waveforms of time-domain and frequency-domain excitation, and also can transmit pseudorandom m signal waveforms, and the receiver can be used for data acquisition of conventional IP method and pseudo-random anti-interference method. The system uses SD card as storage medium to collect waveform data in full time domain; uses GPS and line synchronization to realize the cooperative work between transmitter and receiver; and uses wireless Bluetooth and RS232 to realize man-machine interaction. The thesis also designs three kinds of experiments, that is, RC circuit experiment, flume experiment and field experiment. The practicability of the instrument system is verified by many experiments of the instrument, and the scientific nature of the anti-jamming theory of pseudo-random signal is verified by data processing and analysis by MATLAB.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.3
本文编号：2258787
[Abstract]:The anti-jamming theory of pseudo-random signal is based on the correlation identification method and the unit pulse response is connected with the excited polarization method to realize the application of anti-jamming in electrical exploration. This paper discusses the anti-jamming principle of pseudorandom signal from two angles of time domain and frequency domain, and quantitatively analyzes the parameter selection standard which affects the identification accuracy and anti-jamming performance, and uses the simulation software such as MATLAB and Multisim, etc. Combined with two simulation examples of RC resistive circuit and geoelectric system, the system identification and anti-interference simulation are carried out, a set of pseudorandom IP instrument prototype is developed, and some experiments are designed to verify the instrument and method. In the theoretical derivation of correlation identification and anti-jamming, based on convolution, correlation operation and optimization criterion, the Wiener Hoff equation is derived, and the time domain, correlation and frequency domain characteristics of pseudorandom m signal are introduced. The method of solving the unit pulse response from the data of correlation operation is also discussed. In this paper, the system identification process in time domain is decomposed into four specific steps, each of which has a corresponding frequency domain analysis. The anti-interference principle of correlation identification is explained by time domain characteristic and frequency domain characteristic of pseudo random m signal. In the part of system simulation, RC resistive circuit with analytic formula and geoelectric system are selected as simulation system, which make full use of the high efficiency numerical operation characteristic of MATLAB. The whole process of the system is simulated from the point of view of non-interference and interference. The paper also introduces two indexes to evaluate the anti-jamming performance, power signal-to-noise ratio gain and noise variance gain, and quantitatively evaluate the anti-jamming performance of pseudo-random signals. A set of pseudorandom ionization instrument prototype, including transmitter and receiver, is developed in this paper. The transmitter can transmit conventional waveforms of time-domain and frequency-domain excitation, and also can transmit pseudorandom m signal waveforms, and the receiver can be used for data acquisition of conventional IP method and pseudo-random anti-interference method. The system uses SD card as storage medium to collect waveform data in full time domain; uses GPS and line synchronization to realize the cooperative work between transmitter and receiver; and uses wireless Bluetooth and RS232 to realize man-machine interaction. The thesis also designs three kinds of experiments, that is, RC circuit experiment, flume experiment and field experiment. The practicability of the instrument system is verified by many experiments of the instrument, and the scientific nature of the anti-jamming theory of pseudo-random signal is verified by data processing and analysis by MATLAB.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.3
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