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针对超宽带(UWB)通信中窄脉冲时位同步的特殊性及其接收脉冲信号的簇特性,根据文献[1]提出的五种基于Markov链模型的顺序搜索算法所给出的平均捕获时间公式,运用Markov链理论对给出的各种搜索算法的平均搜索捕获时间的数学公式进行详细的推导,得到正确的平均捕获时间公式,并通过仿真结果验证了比特反转搜索算法所需的平均捕获时间最短.同时对UWB通信特殊的脉冲帧内窄脉冲时位的同步捕获问题进行了阐述. 相似文献
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In the three-dimensional (3D) contour measurement, the phase shift profilometry (PSP) method is the most widely used one. However, the measurement speed of PSP is very low because of the multiple projections. In order to improve the measurement speed, color grating stripes are used for measurement in this paper. During the measurement, only one color sinusoidal fringe is projected on the measured object. Therefore, the measurement speed is greatly improved. Since there is coupling or interference phenomenon between the adjacent color grating stripes, a color correction method is used to improve the measurement results. A method for correcting nonlinear error of measurement system is proposed in this paper, and the sinusoidal property of acquired image after correction is better than that before correction. Experimental results show that with these correction methods, the measurement errors can be reduced. Therefore, it can support a good foundation for the high-precision 3D reconstruction. 相似文献
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基于单片机的FPGA被动串行配置方式 总被引:3,自引:0,他引:3
通过采用AT89C2051单片机配合串行的E^2PROM存储器,实现ALTERA公司LEX10K系列FFPGA芯片的被动串行配置,其软硬件的设计,选用支持I^2C总线协议的24C128芯片来存储配置文件完成。经电路实验表明,采用单片机对FPGA进行串行配置,读取存储文件不但速度快而且准确,并具有配置时间短、准确率高、易于实现等优点。 相似文献
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Aiming at the low speed of traditional scale-invariant feature transform (SIFT) matching algorithm, an improved matching algorithm is proposed in this paper. Firstly, feature points are detected and the speed of feature points matching is improved by adding epipolar constraint; then according to the matching feature points, the homography matrix is obtained by the least square method; finally, according to the homography matrix, the points in the left image can be mapped into the right image, and if the distance between the mapping point and the matching point in the right image is smaller than the threshold value, the pair of matching points is retained, otherwise discarded. Experimental results show that with the improved matching algorithm, the matching time is reduced by 73.3% and the matching points are entirely correct. In addition, the improved method is robust to rotation and translation. 相似文献
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通过采用AT89C2051单片机配合串行的E2PROM存储器,实现ALTERA公司FLEX10K系列的FPGA芯片的被动串行配置,其软硬件的设计,选用支持I2C总线协议的24C128芯片来存储配置文件完成。经电路实验表明,采用单片机对FPGA进行串行配置,读取存储文件不但速度快而且准确,并具有配置时间短、准确率高、易于实现等优点。 相似文献
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一、前言通信电缆线路是我国主要通信线路设备之一。随着我国工业、农业和邮电事业的迅猛发展,通信电缆已遍布全国各地。在送电线路设计中,难免需对通信电缆线路的危害影响进行保护设计,而必须正确确定通信电缆的屏蔽系数才能优化设计。 相似文献
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