本文選題：相位展開 + 調(diào)制方式識(shí)別　； 參考：《南京航空航天大學(xué)》2014年碩士論文

【摘要】：本文重點(diǎn)研究了電子偵查領(lǐng)域中五種相位調(diào)制信號(hào)(二相編碼信號(hào)BPSK、四相編碼信號(hào)QPSK、多相碼信號(hào)(Frank碼、P1碼、P2碼、P3碼、P4碼)、線性調(diào)頻-二相編碼復(fù)合調(diào)制信號(hào)LFM-BSPK、頻率編碼-二相編碼復(fù)合調(diào)制信號(hào)FSK-BPSK)在多種常見雷達(dá)信號(hào)環(huán)境中的調(diào)制方式識(shí)別和參數(shù)估計(jì)。 首先，研究了相位調(diào)制信號(hào)的相位和頻率特征，通過對信號(hào)進(jìn)行相位展開的方法獲取信號(hào)的時(shí)相和時(shí)頻信息。以時(shí)相和時(shí)頻特征為基礎(chǔ)，根據(jù)時(shí)頻曲線跳變點(diǎn)、時(shí)頻曲線峰度系數(shù)、時(shí)相曲線擬合離差等方法對五種相位調(diào)制信號(hào)在多種常見的雷達(dá)信號(hào)環(huán)境中進(jìn)行調(diào)制方式識(shí)別。 提出了一種MPSK信號(hào)載頻盲估計(jì)的算法，在頻域截取濾波的基礎(chǔ)上，通過平方運(yùn)算消除偽碼信息，使其轉(zhuǎn)化為正弦波信號(hào)，接著估計(jì)正弦波信號(hào)的載頻�？偨Y(jié)了MPSK信號(hào)其他參數(shù)的盲估計(jì)方法，并在此基礎(chǔ)上提出了一種改進(jìn)的解碼算法。最終形成一套完成MPSK信號(hào)參數(shù)估計(jì)方法。 研究了LFM-BPSK信號(hào)的參數(shù)盲估計(jì)方法。首先對信號(hào)作平方運(yùn)算以消除相位跳變，，使其轉(zhuǎn)化為LFM信號(hào)，估計(jì)LFM的起始頻率和調(diào)制斜率，將估計(jì)結(jié)果作為二維牛頓迭代的初始值，進(jìn)行一次二位牛頓迭代以提高估計(jì)精度。并在此基礎(chǔ)上，將LFM-BPSK轉(zhuǎn)化為基帶信號(hào)，根據(jù)MPSK信號(hào)的解碼算法對基帶信號(hào)進(jìn)行解碼。 研究了FSK-BPSK信號(hào)的參數(shù)盲估計(jì)方法。在對FSK-BPSK信號(hào)調(diào)制方式識(shí)別的同時(shí)，以FSK的碼元跳變點(diǎn)對信號(hào)進(jìn)行分段，估計(jì)FSK碼元寬度。在每個(gè)FSK碼元上，估計(jì)BPSK的載頻等參數(shù)，最終實(shí)現(xiàn)整體解碼。 Matlab仿真結(jié)果表明，本文算法具有較好估計(jì)性能，且計(jì)算復(fù)雜度低，具有較高的工程應(yīng)用價(jià)值。
[Abstract]:This paper focuses on five kinds of phase modulated signals (BPSK, QPSK, P4), LFM-BSPK, frequency and frequency. The modulation mode identification and parameter estimation of FSK-BPSK) in a variety of common radar signal environments. Firstly, the phase and frequency characteristics of the phase-modulated signal are studied, and the time-phase and time-frequency information of the signal is obtained by phase unwrapping. On the basis of time-frequency and time-frequency characteristics, five kinds of phase-modulated signals are identified in various radar signal environments according to time-frequency curve jump point, time-frequency curve kurtosis coefficient, time-frequency curve fitting deviation and so on. An algorithm for blind carrier frequency estimation of MPSK signals is proposed. Based on frequency domain interception and filtering, the pseudo-code information is eliminated by square operation, which is converted into sine wave signal, and then the carrier frequency of sine wave signal is estimated. The blind estimation method for other parameters of MPSK signal is summarized, and an improved decoding algorithm is proposed. Finally, a set of parameters estimation method for MPSK signal is formed. A blind parameter estimation method for LFM-BPSK signal is studied. First, the signal is squared to eliminate the phase jump, which is transformed into LFM signal, and the initial frequency and modulation slope of LFM are estimated. The estimation result is regarded as the initial value of the two-dimensional Newton iteration, and the estimation accuracy is improved by a two-bit Newton iteration. On this basis, LFM-BPSK is converted into baseband signal, and the baseband signal is decoded according to the decoding algorithm of MPSK signal. A blind parameter estimation method for FSK-BPSK signal is studied. While the modulation mode of FSK-BPSK signal is recognized, the symbol width of FSK is estimated by segmenting the signal with the symbol jump point of FSK. The carrier frequency and other parameters of BPSK are estimated on each FSK symbol, and the whole decoding is realized. The simulation results of Matlab show that the proposed algorithm has good estimation performance, low computational complexity and high engineering application value.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN911.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 黃曉紅;鄧振淼;;改進(jìn)的相位展開算法及其在瞬時(shí)頻率估計(jì)中的應(yīng)用[J];電子學(xué)報(bào);2009年10期

2 熊剛,趙惠昌,王李軍;偽碼-載波調(diào)頻偵察信號(hào)識(shí)別的譜相關(guān)方法(Ⅱ)——偽碼-載波調(diào)頻信號(hào)的調(diào)制識(shí)別和參數(shù)估計(jì)[J];電子與信息學(xué)報(bào);2005年07期

3 林俊;熊剛;王智學(xué);;基于時(shí)頻分析的偽碼與線性調(diào)頻復(fù)合體制偵察信號(hào)參數(shù)估計(jì)研究[J];電子與信息學(xué)報(bào);2006年06期

4 熊剛;楊小牛;趙惠昌;;基于平滑偽Wigner分布的偽碼與線性調(diào)頻復(fù)合偵察信號(hào)參數(shù)估計(jì)[J];電子與信息學(xué)報(bào);2008年09期

5 吳江標(biāo),萬方,郁春來;基于小波變換法的相位編碼信號(hào)脈內(nèi)特征提取[J];航天電子對抗;2005年03期

6 趙培聰;史雪輝;;現(xiàn)代海軍雷達(dá)偵察技術(shù)發(fā)展分析[J];艦船電子對抗;2011年01期

7 李明晏;張魯筠;江銘炎;許建華;張超;;復(fù)雜脈內(nèi)調(diào)制雷達(dá)信號(hào)的識(shí)別方法[J];計(jì)算機(jī)工程與應(yīng)用;2011年15期

8 唱亮;汪芙平;王贊基;;基于Haar小波變換的直擴(kuò)信號(hào)參數(shù)盲估計(jì)[J];清華大學(xué)學(xué)報(bào)(自然科學(xué)版);2006年10期

9 鄧振淼;劉渝;王志忠;;正弦波頻率估計(jì)的修正Rife算法[J];數(shù)據(jù)采集與處理;2006年04期

10 陳迎春,葛臨東;基于DFT的PSK信號(hào)載波頻差估計(jì)算法[J];現(xiàn)代電子技術(shù);2003年02期

相關(guān)博士學(xué)位論文 前1條

1 鄧振淼;雷達(dá)信號(hào)脈內(nèi)分析與處理理論及算法研究[D];南京航空航天大學(xué);2007年

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