偽隨機信號抗干擾理論及其在激電儀中的應用研究
發(fā)布時間：2018-10-09 09:07
【摘要】：偽隨機信號抗干擾理論基于相關辨識法,通過單位脈沖響應與激發(fā)極化法聯(lián)系起來,從而實現(xiàn)在電法勘探中的抗干擾應用。本論文從時域和頻域兩個角度討論偽隨機信號抗干擾原理,并定量地分析影響辨識精度和抗干擾性能的參數(shù)選擇標準;使用MATLAB和Multisim等仿真軟件,結合RC阻容電路和地電系統(tǒng)兩個仿真算例進行系統(tǒng)辨識和抗干擾仿真;研制一套偽隨機激電儀器樣機,并設計若干實驗對儀器和方法進行驗證。在相關辨識和抗干擾的理論推導部分,基于卷積、相關運算和最優(yōu)化準則推導出維納-霍夫方程,介紹偽隨機m信號的時域、相關和頻域特性,并討論由相關運算的數(shù)據求解單位脈沖響應的方法。論文將時域的系統(tǒng)辨識過程分解為四個具體的步驟,每個步驟都有對應的頻域分析。通過偽隨機m信號時域特性和頻域特性對相關辨識的抗干擾原理進行解釋。在系統(tǒng)仿真部分,充分利用MATLAB高效的數(shù)值運算特點,選擇具有解析公式的RC阻容電路和地電系統(tǒng)作為仿真系統(tǒng),從無干擾和有干擾的角度進行了系統(tǒng)全過程的仿真。論文還介紹了兩種評價抗干擾性能的指標,功率信噪比增益和噪聲方差增益,定量評價偽隨機信號抗干擾性能。本論文研制一套偽隨機激電儀器樣機,包括發(fā)送機和接收機。發(fā)送機可以發(fā)射常規(guī)的時域和頻域激電的波形,也可以發(fā)射偽隨機m信號波形;接收機可以用于常規(guī)激電法和偽隨機抗干擾電法的數(shù)據采集工作。系統(tǒng)使用SD卡作為存儲介質,采集全時域的波形數(shù)據;采用GPS和線同步方式,實現(xiàn)發(fā)送機和接收機協(xié)同工作;使用無線藍牙和RS232實現(xiàn)人機交互。論文還設計了三類實驗,即RC電路實驗、水槽實驗和野外實驗。通過多次的儀器實驗,驗證了該儀器系統(tǒng)的實用性;通過MATLAB進行數(shù)據處理和分析,驗證了偽隨機信號抗干擾理論的科學性。
[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.
【學位授予單位】：中國地質大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P631.3
本文編號：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.
【學位授予單位】：中國地質大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P631.3
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