And when the array transmits back to the cell - phone user , the processor sends an out - of - phase signal to one of the antennas , generating a radio beam that runs from north to south 当阵列发射讯号给行动电话用户时,处理器会传送一个异相的讯号到其中一个天线,产生由北往南的无线电波束。
It has important value in military and civil . conventional algorithms for synthetic aperture radar uses the matched filter and convolves the data with a reference phase signal which changes with range 合成孔径雷达( sar )是二战后发展起来的一种新的雷达技术,在军事和民用方面都有重要的应用价值。
Time - frequency analysis and parameter estimation of noisy polynomial phase signal ( pps ) are the general problems in such fields as radar , sonar , communication , biomedical application , seismic signal analysis and so on 噪声背景中多项式相位信号的时频分析和参数估计是雷达、声纳、通信、生物医学、地震信号分析等领域需要解决的共性问题。
Three - phase signal is formed by program in this system , which has rich harmonic high to 24th , and its amplitude and phase can be adjusted arbitrarily . electric parameters such as virtual value , power and phase can be real - time measured , besides harmonic analysis by means of fft algorithm 在系统中,富含24次谐波成份的三相信号由软件产生,其幅度、相位可以任意调整,同时系统能实时测量信号的有效值、功率、相位等电量参数,并用fft进行谐波分析。
Abstract : : a technique for carriersynchronization of a digital modem is studied and the results of computer simulations are given . through comp arison of twokinds of phase estimator systems , it is shown that the combination of phase signal decision process and signal decoding processwill improve system performances obviously 文摘:分析了数字调制解调器载波同步技术,提供了计算机模拟测试的结果,并通过对两种不同鉴相器系统的性能比较,说明了把信号相位判断过程与信号解码过程结合,可使系统的性能得到明显改善。
In the second method , wavelet transform is combined with modal transform , and transient travelling - wave signal is used . after three phase signals are decomposed into their modal components , the wavelet transform coefficient of ground mode can be used to identify approximate position of fault , and the wavelet transform coefficient of aerial mode is used for identifying arrival time of traveling - wave 第二种方法将小波变换与模式变换理论结合起来,采用的是暂态行波信号,首先将三相信号转换成模式分量,零模分量的小波变换系数用于判别故障的大致位置,然后利用线模分量的小波变换系数来确定行波到达时间。
Autonomous formation flyer technology developed by jpl is used three receiving antennas and one transmitting antenna are installed on each satellite each of satellites can transmit analog gps signal but more accuracy . the multiple receiving antennas on the every satellite are capable of acquiring precise pesudorange and carrier phase signals transmitted by other satellite and compose of a kind of onboard augment gps system 在文中,利用jpl提出的自主编队飞行技术aff ,在每个编队卫星上安装一个发射天线和三个接收天线,每一个发射天线可以发射类似于gps的高精度伪距和载波信号,与其它卫星上的多个接收天线构成星载扩展gps系统。
This product acquires engine crank corresponding phase signal and rotating speed signal , which after ecu treatment , are used together with signals collected from other load sensor ( such as shutter location sensor ) to achieve electronic control over engine ignition timing . compared with mechanical ignition timing control , this is more precise and reliable , resulting in optimized performance of engine in oil consumption , exhaust , output and torque Fdw465b型电喷分电器总成采集发动机曲轴相位信号及转速信号,同其它负荷传感器(如节气门传感器等)采集到的信号,经电控单元ecu计算处理后,实现对发动机点火正时的电子控制,较之机械式点火正时控制更加精确、可靠,使汽车发动机系统的综合性能得到较大提高,特别是发动机的燃油消耗率、排放、输出功率、扭矩等方面都得到较大优化。
The reseach work focused on the time delay estimation of the common practical radar singnals , including harmonics signal , chirp signal , polynomial phase signal , and phase - shift keying signal . the new algorithm for different radar signals are deduced in detail respectively , and simulation results are presented . the results proved that the new method is efficient for time delay and some other parameters estimation 正弦信号、线性调频信号、多项式相位信号、相位编码信号是雷达信号中常用的几种信号,对这几种信号的研究是雷达信号处理中非常重要的内容,也是实际工程的需要。因此,本文选择上述几种信号作为研究对象,对这几种信号的时延估计算法进行了建模和理论推导,给出了时延估计算法的具体表达式,并进行了计算机仿真。
We give ptr ' s amplitude and phase signal of one dimension based on the theory of ptr , discuss the ptr ' s signal ' s frequency characteristic , and a method for measuring thermal diffusivity of opaque materials is introduced . then , we study on anisotropic materials " thermal conductivity , the temperature field and thermal conductivity tensor of anisotropic materials is theoretically deduced from the theory of ptr , and is proved by the experiment 从光热辐射理论出发,推导出一维情况下ptr信号的振幅和位相表达式,讨论了光热信号的频率特性,介绍了一种用ptr技术测量不透明材料热扩散系数的优化方法;接着研究分析了各向异性介质受调制激光束辐照下产生的光热信号,在理论上推导出各向异性介质的温度场以及热导率张量并给予一定的实验验证。