【摘要】：雙音多頻(DTMF)技術(shù)在頻段上的復(fù)用可以增加水聲通信技術(shù)中單位時(shí)間內(nèi)傳遞的信息量,在通信效率上相比于單音頻通信技術(shù)有明顯提升。所以雙音多頻技術(shù)在水聲通信中的進(jìn)步能夠?yàn)楹Ｑ箢I(lǐng)域的發(fā)展提供堅(jiān)實(shí)的基礎(chǔ),具有較好的研究價(jià)值和應(yīng)用前景。本文通過研究雙音多頻通信中相關(guān)目標(biāo)頻點(diǎn)與其頻點(diǎn)因數(shù)變換之間的數(shù)值關(guān)系,以傳統(tǒng)Goertzel算法的濾波原理為基礎(chǔ),深入分析數(shù)字濾波中導(dǎo)致頻譜偏移、失真的窗形截短和頻譜泄露問題,對Goertzel濾波算法進(jìn)行有效功率譜頻點(diǎn)的校正和頻譜泄露的線性補(bǔ)償。設(shè)計(jì)并實(shí)現(xiàn)一種基于雙音多頻增強(qiáng)型Goertzel濾波算法的動(dòng)態(tài)信息檢測系統(tǒng)。本論文的主要工作包括：1)提出一種頻譜校正的增強(qiáng)型Goertzel濾波算法。該算法以傳統(tǒng)Goertzel算法為基礎(chǔ),本文分析非整數(shù)頻點(diǎn)因數(shù)在Goertzel算法遞歸迭代中的可行性,通過對目標(biāo)頻點(diǎn)的校正對功率譜計(jì)算過程進(jìn)行優(yōu)化,提高對雙音多頻信號流軟件解碼過程中目標(biāo)頻點(diǎn)功率譜幅值的可識別度,并通過軟件仿真和硬件系統(tǒng)實(shí)驗(yàn)對此進(jìn)行了驗(yàn)證。2)提出一種頻譜泄露補(bǔ)償型Goertzel濾波算法。該算法在頻譜校正的增強(qiáng)型Goertzel濾波算法的基礎(chǔ)上引入與目標(biāo)頻點(diǎn)對應(yīng)的功率譜失真問題,在分析數(shù)字采樣和窗形截短對雙音多頻信號頻譜泄露的疊加影響后,提出分級泄露頻點(diǎn)的的線性補(bǔ)償算法,對頻譜校正的增強(qiáng)型Goertzel濾波算法在功率譜泄露上進(jìn)行修正,通過軟件仿真和硬件系統(tǒng)實(shí)驗(yàn)證實(shí)目標(biāo)頻點(diǎn)功率譜幅值的可識別度在雙音多頻信號解碼過程中的提高。3)設(shè)計(jì)并實(shí)現(xiàn)一種基于雙音多頻增強(qiáng)型Goertzel濾波算法的動(dòng)態(tài)信息檢測系統(tǒng)。在本系統(tǒng)的設(shè)計(jì)中提出由甲板單元和水下主機(jī)單元構(gòu)成的主機(jī)部分以及由信標(biāo)分機(jī)和管道內(nèi)部檢測單元構(gòu)成的分機(jī)部分的設(shè)計(jì)結(jié)構(gòu),明確各部分詳細(xì)的設(shè)計(jì)方案并進(jìn)行實(shí)現(xiàn)。通過實(shí)驗(yàn)對比可以得出改進(jìn)的Goertzel算法檢測效果由于傳統(tǒng)算法以及硬件解調(diào)方案。
[Abstract]:The multiplexing of dual-tone and multi-frequency (DTMF) technology in frequency band can increase the amount of information transferred in the unit time of underwater acoustic communication technology, and the communication efficiency is obviously improved compared with that of single audio communication technology. Therefore, the progress of dual-tone multi-frequency technology in underwater acoustic communication can provide a solid foundation for the development of ocean, and has good research value and application prospect. In this paper, we study the numerical relationship between the frequency points of the target and the frequency factor transformation in the dual-tone multi-frequency communication. Based on the filtering principle of the traditional Goertzel algorithm, we deeply analyze the spectrum offset caused by the digital filtering. The problem of window truncation and spectrum leakage of distortion is used to correct the effective power spectrum frequency points and compensate the spectrum leakage linearly for the Goertzel filtering algorithm. A dynamic information detection system based on dual-tone multi-frequency enhanced Goertzel filtering algorithm is designed and implemented. The main work of this thesis is as follows: 1) an enhanced Goertzel filtering algorithm for spectrum correction is proposed. Based on the traditional Goertzel algorithm, this paper analyzes the feasibility of the non-integer frequency factor in the recursive iteration of the Goertzel algorithm, and optimizes the power spectrum calculation process by correcting the target frequency points. The recognition degree of power spectrum amplitude of target frequency point in the process of software decoding of dual-tone multi-frequency signal stream is improved, and it is verified by software simulation and hardware system experiment. 2) A spectrum leakage compensated Goertzel filter algorithm is proposed. Based on the enhanced Goertzel filtering algorithm for spectrum correction, the power spectrum distortion problem corresponding to the target frequency point is introduced. After analyzing the superposition effect of digital sampling and window truncation on the spectrum leakage of dual-tone multi-frequency signals, A linear compensation algorithm for hierarchical leakage frequency points is proposed. The enhanced Goertzel filtering algorithm for spectrum correction is modified on power spectrum leakage. Software simulation and hardware system experiments show that the recognizability of target power spectrum amplitude is improved in the decoding process of dual-tone multi-frequency signal. 3) Design and implementation of a dual-tone multi-frequency enhanced Goertzel filter algorithm State information detection system. In the design of the system, the design structure of the host part composed of the deck unit and the underwater main engine unit and the extension part composed of the beacon extension and the pipeline internal inspection unit is put forward, and the detailed design scheme of each part is made clear and realized. The experimental results show that the improved Goertzel algorithm is based on the traditional algorithm and the hardware demodulation scheme.
【學(xué)位授予單位】：北京工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN929.3

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