共查询到20条相似文献,搜索用时 31 毫秒
1.
对微型计算机控制的数字信号光纤传输系统中的光信号检测和再生电路的结构,工作原理和信号的再生条件进行了理论分析,并提出了相应的实验研究方法,实验结果与理论分析所得结论十分一致。 相似文献
2.
3.
光磁共振实验中扫场和水平场关系的探究 总被引:1,自引:0,他引:1
光泵磁共振实验中,在磁共振信号观察时,常常会有光抽运信号同时出现的现象,这严重影响了实验的有效观察和准确测量。本文阐述了取合适的扫场和水平场的大小的关系,从而避免实验过程中磁共振信号和光抽运信号的同时出现,以确保实验的精准。 相似文献
4.
5.
本文从根动与声学角度出发,用一种高性能的检测系统采集了挠动脉脉搏声信号,首次利用倒谱分析技术对两种脉搏信号进行了处理.获得了脉象功率谱和倒谱及其特征参数.分析结果表明:脉象功率谱可准确地判断人的呼吸频率特性;清脉信号在SHZ以内的谱能量约占总能量的83.7呢,而结代脉仅占47.2%;由倒港客观、准确地获得了脉搏周期值,倒谱可定量地给出脉搏强度大小,并可分析心律的稳定性等.本文的研究,为中医脉象的客观化研究和西医的心血管疾病的无创检测提供了一条新的途径. 相似文献
6.
7.
主要研究8mm波段,雷达FMCW信号的时域及频域特性,通过对理论值与实测值的比较、分析,验证了8mm收发模块的可行性,并为下级信号处理作了准备。 相似文献
8.
HOU Hong XIAO Hui SUN Jincai 《声学学报:英文版》2007,26(1):28-38
In order to test the validity of signal phase matching principle (SPMP) applied to direction of arrival (DOA) estimation, experiments are carried out at a reservoir using 16 sensors array. Two kinds of method, Least Square Method for Signal Matching principle (LSMSPM) and singular value decomposition method for signal matching principle (SVDSPM), are used for DOA estimation. Their performances were analyzed and compared with MUSIC and conventional beam-forming (CBF) method. The results show that the 3 dB beam width obtained by SPMP is 1/4 to 1/7 as much as that obtained by CBF and 1/2 to 1/3 by MUSIC method. In addition, LSMSPM and SVDSPM are available for multi-sources DOA estimation and high resolution DOA estimation, which demonstrates that DOA estimation by SPMP method is better than that by MUSIC and CBF method. 相似文献
9.
10.
11.
12.
13.
无人机动态信号采集与处理,是对无人机控制的关键。设计并实现了一种基于LED-89C52的无人机动态信号采集与处理系统,该系统以89C52单片机为核心,使用高质量的信号采集终端模块以及信号处理调理模块增强检测精度,提高无人机大气信号检测的动态性能,系统的硬件设计,主要包括89C52单片机、信号采集终端、信号处理板模块、信号调理模块以及传感器信号放大与A/D转换模块和显示译码驱动模块、LED数码管显示模块等,给出了系统实现动态信号采集与处理的流程图以及程序代码,实现无人机中动态信号有效采集与处理。实验结果表明,所提系统可准确获取无人机中动态信号,完成信号的有效处理,具有较高的准确率,应用前景阔。 相似文献
14.
The development of an implantable five channel microelectrode array is presented for neural signal recordings. The detailed fabrication process is outlined with four masks used. The SEM images show that the probe shank is 1.2mm long, 100μm wide and 30μm thick with the recording sites spaced 200μm apart for good signal isolation. The plot of the single recording site impedance versus frequency is shown by test in vitro and the impedance declines with the increasing frequency. Experiment in vivo using this probe is under way. 相似文献
15.
16.
17.
Recently, it has become an important problem to confirm the bifurcation threshold value of a chaos detection system for a weak signal in the fields of chaos detection. It is directly related to whether the results of chaos detection are correct or not. In this paper, the discrimination system for the dynamic behaviour of a chaos detection system for a weak signal is established by using the theory of linear differential equation with periodic coefficients and computing the Lyapunov exponents of the chaos detection system; and then, the movement state of the chaos detection system is defined. The simulation experiments show that this method can exactly confirm the bifurcation threshold value of the chaos detection system. 相似文献
18.
19.