This dissertation is the expanding of the military project of ‘ 95 ’ advance research , a novel multi - modulation technique designing radar signal waveform is introduced on the links with the project of the national natural science fundation of china ( nsfc ) , named " produce and process the multi - modulation signal of the sensor with strong detectability and identifiability " . based on the analysis of the equal - probability - distributing fsk / psk multi - modulation signal , we construct a new pseudo - random fsk / psk multi - modulation signal and we design and simulink on the computer the partly - matched processing signal of this signal . the purpose of the design is to construct a processing signal to combine with the pseudo - random fsk / psk multi - modulation signal , so that we could get a strong response of the target 本论文是‘九五’军事预研项目“低截获概率雷达波形研究”的扩展与深入，同时结合国家自然科学基金项目“强探测强识别传感器新型复合调制信号产生及处理”展开。在分析等概率分布的fsk / psk复合调制信号的基础上，构造了一种新的伪随机fsk / psk复合调制信号及其非完全匹配处理的设计及仿真。设计的目的是能对伪随机fsk / psk复合调制信号进行处理的处理信号，以期获得对所探测目标信息的强探测。
Nowadays , the application of electronic support measure ( esm ) receivers , radar warning receivers ( rwr ) and especially arm forms a serious menace to radar ' s existence and the low probability of interception ( lpi ) radar just appears under this circumstance . lpi radar attempts to use various techniques to make radar signal not be intercepted by intercept receivers 现代电子支援侦察( esm )接收机和雷达告警接收机( rwr )尤其是反辐射导弹( arm )的应用对雷达的生存构成了严重的威胁,低截获概率雷达正是在这种环境下提出的一种新体制雷达,它试图采用各种可能的技术来避免雷达信号被截获接收机所截获。
Fsk / psk radar signal is the signal with both fsk and psk modulation at one time . it is with large bandwidth time product ( bt ) , thumbtack - like ambiguity function and well ability of anti - emi . the fsk / psk signals of which the frequency - hopping and bi - phase sequences were randomly chosen often have high sidelobe level Fsk / psk信号是同时进行频移键控( fsk )和相移键控( psk )调制的信号,该信号具有大时带宽积( bt )和高分辨特性,并具有“图钉型”模糊图结构、低截获概率( lpi )特性和较好的抗干扰能力,受到了广泛的重视。
Frequency - hopping ( fh ) is a novel spread spectrum communication technique , which develops very fast in military field due to its lpi / lpd ( low probability of intercept / detection ) properties and immunity against interferences , the extensive application of hf / vhf ( high frequency / very high frequency ) frequency - hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and ensure the safety and validity of chain of military command 跳频技术是扩频技术的一种，是80年代以来出现的一种新的通信方式。跳频通信具有良好的抗干扰性，低截获概率及组网能力，因此跳频技术的一出现，便在军事领域得到了极大的发展。采用跳频技术的短波超短波电台在军事通信中得到了广泛应用，极大地提高了军事装备的抗截获和抗干扰能力，保证了军事指挥系统的安全和有效性。
In the dissertation , phase - coded signals and chirp signals are studied . because the two signals have cyclic features , the cyclostationary theory has been applied in the detection and estimation of both signals . some novel methods of detection and estimation are proposed after intensive investigation 本文主要对两种主要低截获概率信号(相位编码信号和线性调频信号)进行了研究和探讨，基于两种信号都具有循环平稳性，将循环平稳理论应用于信号的检测和参数估计，通过深入研究提出了一些有效的检测和估计方法。
With multi - modulation , the disadvantages of single - modulation ( such as fsk , psk and ppm ) can be eliminated . by taking the advantages of different modulations , the performance of range resolving , doppler resolving and low probability of intercept ( lpi ) of the signal can be improved 复合调制信号可以克服单一信号调制形式(如fsk 、 psk 、 ppm等)的缺点,实现信号之间的取长补短,提高距离、速度分辨力,提高信号的低截获概率( lpi )性能,是雷达理论与技术的发展方向。
