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一种从采样数据中提取信号频率的方法 总被引:1,自引:0,他引:1
首先,提出了一种从采样数据中提取信号频率的方法;其次,通过相对误差计算公式给出了此种方法的相对误差,且在matlab环境下验证了此种算法并给出了仿真结果,对从采样数据中提取信号频率的研究有一定的参考意义。 相似文献
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相位干涉仪中均匀阵列测向精度研究 总被引:1,自引:0,他引:1
对相位干涉仪体制中所使用的两种均匀阵列进行了研究,对阵列的测向算法进行了改进,并用matlab软件进行了计算机仿真,仿真结果表明在同等条件下,虽然平面阵的算法较复杂,但是测量误差更小,测向精度更高,具有更好的性能。 相似文献
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为实现下位机数据的接收和上位机数据曲线显示,本文应用matlab GUI,设计串口通讯程序,并将接收的数据存储在Execl数据表中,通过调用matlab的Axes控件,实现了数据的曲线显示。 相似文献
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介绍某机载高重频PD雷达接收机和信号处理系统的基本技术思路、仿真系统组成结构及仿真处理流程,并利用matlab进行了仿真,给出了主要模块的输出波形及整个雷达系统的检测概率、虚警概率和均方误差等性能参数。 相似文献
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动态精度试验是指在目标和飞机处于相对运动的状态下,检查火控系统输出值相对标准值的误差。根据机载火控系统和雷达观测的数据,基于时间序列建模的理论,采用matlab仿真的方法对火控精度进行了测定。结果表明这是一种有效、简洁的方法。 相似文献
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A method that increases the error resistance of the HDTV system and offers graceful picture degradation in the presence of bit errors, is presented. Due to the nature of the presently proposed compression schemes for HDTV systems, an error in a data bit does not only affect the block the bit belongs to, but unfortunately the effects of this error may perpetuate to the following blocks. This is because a bit error may cause loss of synchronization between the data bits and the picture blocks they represent. Our method restricts the effects of a bit error to a picture block whose size is significantly smaller than those used by the HDTV systems. We achieve synchronization by transmitting a header-word for each such synchronization block. Each header-word contains the number of data bits representing the compressed block. This header-word is protected by two levels of FEC code. To decrease the number of extra bits needed by the header-words, two different synchronization block sizes are used, a relatively small block size for the reference frames and a larger size for the inter-frames. The resulting method improves the quality of the picture in the presence of errors and defers the SNR at which the HDTV picture suddenly deteriorates by 2.5 to 3 dB. It also allows operation at higher order modulation transmission schemes, e.g., 32-QAM instead of 16-QAM, without the requirement of increased signal power 相似文献
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An image synthesizing technique called Synthevision is described. In this approach to image synthesis, a line NTSC camera foreground picture is synchronously keyed into a background picture which is digitally processed from a wide Hi-Vision image. This background-derived picture is controlled by a computer using data from the foreground camera. If the camera image is altered by actions of zooming, panning, and focusing, the background picture is altered accordingly through the use of a newly developed digital image processor. The combined image thus exhibits a far greater realism than conventional chroma-key imaging. Synthevision is currently used at NHK for the evening news to change the background for each segment 相似文献
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本文设计了一种基于Intel XScale PXA255硬件平台和嵌入式操作系统WinCE的二维条码数据采集器,可以有效地进行二维条码信息的译码.将应用程序分解成多任务,简化了应用系统软件设计.使用CMOS数字图像传感芯片,获取二维条码的原始图像,再由硬件平台中的图像处理程序对图像数据进行处理,然后在条码中定位单个码字符号的图像,利用算法识别出单个码字符号. 相似文献
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《Electron Devices, IEEE Transactions on》1984,31(1):124-125
The interpretation by del Alamo and Swanson of recombination-current data in highly doped silicon is clarified by making explicit their key assumptions. This leads to our reaffirming the merit of using temperature dependence in determining energy gap narrowing. This use gives newly determined low values of minority-carrier mobility and diffusivity, accompanied by a simple physical picture recently published elsewhere. 相似文献
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