作为信号的

Aimed at rapidity and low power consumption required by intelligent mines,based on correlation theory and pattern recognition technology,a new method is given,in which helicopter noise signal of time domain is analyzed directly,that is to estimate fundamental frequency by calculating self-correlation function,then recognize target thinking of the fundamental frequency as characteristic quantity.

预警识别是被动声探测的关键技术之一，其作用是探测环境噪声信号作为预警信号，当直升机或其它目标出现时，传声器检测到的声能首先被转化为一定幅度的电压信号，电路通过判断信号的大小和其它特征来确定是否出现直升机目标。

Selecting Distributed Feedback Laser Diode as light resource and the gas absorbing cell with fiber pigtail as its sensor, and using lock in amplifier to distill signal and harmonic measure technology to process that distilled faint signals, we design an instrument of remote and on-line measuring acetylene.

选用分布反馈式半导体激光器作为激发光源，带尾纤的气体吸收气室作为传感器的探测头，以及锁相放大器来提取信号，并通过谐波检测技术对所提取的微弱信号进行处理，设计了一套远距离在线测量乙炔气体的监测仪器。

The method applied in this paper uses the identic sequence instead of chirp sequence.

与以往采用chirp序列作为训练信号的方法不同，该文采用全序列作为训练信号。

The single a machine that should design to adopt serieses MCS-51s primarily conduct and actions main a measurement for, passing spreading feeling machine to the current of air measuring, its change is homologous pulse signal, this pulse signal through A/ D conversion with D/ A conversion after produce the certain electric voltage signal, will show the inceptive pulse signal a discharge for representing to come out at the same time.

该设计主要采用了MCS-51系列的单片机作为主要的芯片，通过传感器对燃气流量的测定，将其转变为相应的脉冲信号，这个脉冲信号经过A/D转换和D/A转化之后产生一定的电压信号，同时会将起初的脉冲信号所代表的流量显示出来。

In the mobile communication system, the intermediate frequency signal results in the characteristic value is took the appraisal signal quality one kind of standard, how this topic main research is withdraws the intermediate frequency signal the characteristic value,as well as withdraws in the method in each kind to select superiorly withdraws the intermediate frequency signal characteristic value the method.

在移动通信系统中，中频信号得特征值是作为评估信号质量的一种标准，本课题主要研究的是如何来提取中频信号的特征值，以及在各种提取方法中选出最优的提取中频信号特征值的方法。

It can fulfill automatic control on swash plate of

它通过对发动机转速信号、大气总温信号的处理，解算出斜板的理论位置，与斜板的位置传感器信号进行比较，其差值作为控制信号经放大后控制电液伺服阀带动作动筒，使斜板向减小差值的方向运动，从而实现对飞机进气道斜板的自动控制。在这一系统中

Because of the features of current of breaker: the range is wide , the signal of short circuit containing the direct circuit that is attenuation signal, when CT is saturation, the signal of current is aberrational, improved Fourier algorithm and maximum slope algorithm are chosen to calculate the current on the base of theoretic analysis.

根据断路器开断电流信号变化范围宽、短路电流信号含有直流衰减分量、当电流互感器深度饱和时，电流信号发生畸变的特点，在理论推导和分析的基础上，综合采用了并联补偿傅氏算法和最大斜率算法作为监测单元中不同范围内的电流信号的处理算法。

The reestablish and error estimation formulas of the non-noise signal under the finitive scale condition is given for the basic filtering operation of high pass, low pass, and band pass respectively. The signal Wavelet analysis softwave developed, which is of some common use, and is served as the basis of the research following it, is also introduced here.

第二章首先建立了突变信号的数学模型；导出了对突变信号进行连续小波分析的尺度截取准则；分别针对突变信号进行高通、低通和带通三种基本滤波操作的情况，给出了在有限尺度分析情况下的非噪部分信号的重建估计和误差估计公式；并介绍了所开发的作为后续工作的基本分析工具、具有一定通用性的信号小波分析软件。

The holistic design of the system and resolved the designs of software and hardware based on VXI bus are put forward according to the demand of test system. The hardware and software is designed, including the formation and design of hardware system, visual instrument software architecture, program design for instrument driver, high speed real-time data collection. In the dynamic test program, the idea of"software is instrument"was applied to meet the diverse test demands. Last, it is proposed that the VXI test system be developed to more totalization and networked. The basic theory of system identification was introduced briefly at first. The principle of spectrum analysis system identification based on Wiener-Hopf equation was expatiated. and the questions in applying Peusdo Random signal as spectrum analysis methods stimulate signal was studied, The generation principle of the peusdo random signal is researched, the characteristic of peusdo random are analyzed from time domain and frequency domain, the inverse repeat peusdo random signal is brought forward to make up the shortage of ordinary peusdo random signal. And a new chaos genetic algorithmis presented to solve the unprecise problem of the traditional method. In the servo valve dynamic characteristic test system, the spectrum analysis methods was applied successfully, the servo valve dynamic characteristic could be acquired rapidly and exactly, the test results were analyzed and the ameliorate methods were brought forward at last.

结合航天某集团液压测试中心测试系统的需求，提出了基于VXI总线的液压测试系统的整体设计方案，完成了测试系统的硬件设计与软件设计，包括硬件系统构成与设计、虚拟仪器软件结构、仪器驱动程序设计、高速同步实时数据采集等内容；以伺服阀动态特性测试为例设计了测试模块，该模块体现了VXI总线仪器软件开发所倡导的&虚拟仪器&的思想，以软件的灵活应用满足了不同的测试需求；结合自动测试系统的发展，研究了VXI测试系统与网络技术结合，实现各种软硬件资源共享，进一步提高设备及数据的利用率和系统的扩展性，使自动测试向综合化、网络化方向发展；研究了伪随机信号作为谱分析法辨识的激励信号时存在的问题，讨论了伪随机信号的产生机理，从频域和时域分析了伪随机信号的性质及其应用，提出了用逆重复伪随机信号弥补了普通伪随机信号的不足，并以混沌遗传算法对逆重复伪随机信号产生过程中的参数进行优化，可以更合理而不是凭经验产生需要的逆重复伪随机信号。

The present paper reviewed advances in plant defense mediated by the signal function of plant VOCs. In some cases plant VOCs can have a direct defense mechanisms against herbivory. It is believed that VOCs can transfer within plant and between the plants of the same species and different species to improve the defense mechanisms of the respective plants, indicating their crucial role in ecosystem function.

总结了植物挥发性物质作为信号物质在提高植物抗性方面的国内外研究成果，阐述了植物挥发性物质不仅能够直接提高植物的抗性，而且可以作为信号物质在同株、同种异株和不同种植物之间进行传递，进而间接提高目标植物的抗性。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了