【作者】 邓建平；

【导师】 赵惠昌；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2009， 博士

【摘要】 本文以伪随机脉位调制与伪码调相复合体制引信为研究对象,主要研究了这种引信的信号时频特征、抗侦察性能、抗干扰性能、典型干扰的抑制方法以及工程实现电路系统仿真与设计。研究内容为伪码复合体制引信的研究领域之一,其研究成果对通信和雷达等基于伪码体制系统的电子侦察与对抗具有重要的参考价值。论文主要内容包括：(1)阐述了伪随机脉位调制与伪码调相复合体制引信的系统组成和工作机理,探讨了该复合体制引信的定距原理和定距性能,分析了该复合体制引信基波信号时域波形的组合方式,推导并仿真了基波信号的自相关函数、功率谱以及模糊函数,归纳了基波信号的时频特征,分析结果表明该复合体制引信基本保持了伪码良好的自相关特性,同时具备伪随机脉位一定的随机特性。(2)从侦察距离和侦察截获概率两个方面讨论了伪随机脉位调制与伪码调相复合体制引信的抗侦察性能；从信干比增益以及对相关特性的影响两个角度探讨了该复合体制引信的抗噪声性能、抗线性调频干扰性能、抗噪声调幅干扰性能、抗噪声调频干扰性能以及抗伪码调相干扰性能。(3)运用时频信号处理方法实现了对几种典型干扰信号的抑制,详细阐述了抑制原理和抑制过程,并通过仿真实验验证了相应的抑制效果。具体包括基于分数阶傅立叶变换的线性调频干扰抑制、基于两次平方变换的噪声调频干扰抑制以及基于包络滤波和两次平方变换的伪码调相干扰抑制。(4)设计了伪随机脉位调制与伪码调相复合体制引信的原理性系统实现框图,提出了先伪码调相后伪随机脉位调制的复合调制方案,设计并调试了基于ADF4360的本振源系统、基于ADF8349的伪码调相单元、基于BAS70-04LT1的伪随机脉位调制电路、基于ADF8347的解调电路以及基于XC95144的信号处理电路等若干关键环节,仿真分析了数字相关功能的实现及定距特性。更多还原

【Abstract】 Focusing on Pseudorandom Pulse Position Modulation and Pseudorandom Coded Phase modulation Compound Fuze (PRPPM-PRBC), this dissertation mainly studies the characteristics of basic signal, the performance of counter-reconnaissance and antijamming, the excision methods of several typical interferences and system implemental circuits. As one part of the research fields of compound systems of pseudorandom code, the researches would be of great reference to the electronic reconnaissance and counter measures of related Pseudorandom Coded Phase modulation systems such as communication and radar.The dissertation falls into the following four parts:(1) This dissertation explores into the systemic structure and principle of the compound fuze, studies the principle and several performances of preconcerted distance, analyses engineering waveforms and finally deduces and simulates autocorrelating function, spectrum and Ambiguity function of PRPPM-PRBC compound fuze, the results of which show that the compound fuze keeps the superior autocorrelating character of Pseudorandom Code and at the same time, it possesses some random characters.(2) The counter-reconnaissance performance of the compound fuze are discussed in terms of Reconnaissance distance, reconnaissance intercept and capture probability. And the antijamming capabilities on noise and interferences of LFM, NAM, NFM and Pseudorandom Coded Phase-modulation are also analyzed.(3) The excision of several typical interferences including suppressing principles and processes based on modern time-frequency signal processing methods are also discussed. With the help of simulation analysis, the excision effects on each interference are proved. LFM excision based on FRFT, the NFM excision based on twice square transformation, the excision of Pseudorandom Coded Phase-modulation based on envelope filtering and twice square transformation are the details.(4) In the fifth chapter, this dissertation gives the principle implemental frame of the compound Fuze, brings forward the compound modulating scheme of Pseudorandom Coded Phase modulation first then Pseudorandom Pulse Position Modulation. And several other functional units are designed and tested including local oscillation circuits based on ADF4360, Pseudorandom Coded Phase-modulation unit based on ADF8349, PRPPM unit based on BAS70-04LT1, demodulating circuits based on ADF8347 and signal processing unit based on XC95144. Finally the function and several characters of digital correlation of PRPPM-PRBC compound fuze are analyzed by simulation.更多还原