查询词典 circular correlation

The circular correlation algorithm can be used for acquiring Global Positioning System C/A code signals.

采用圆周相关算法实现全球卫星定位系统C/A码信号的捕获。

A PN based Channel Estimation algorithm using circular correlation is proposed, and is implemented in Single Carrier Frequency Domain Equalization system.

提出了一种基于伪噪声序列循环相关的信道估计算法，并将之应用于单载波频域均衡系统中。

The accurate time delay estimation of a signal can be gained even if there is a great time delay because of the stationary performance of circular correlation.

问题是，当加性噪声双方含有相同的信号和各自到达的时间差时，广义相关法将失效。

In the acquisition module,the acquisition algorithm based on circular correlation is utilized.

捕获模块采用基于圆周相关的捕获算法，通过FFT分别作用于输入信号和本地码信号将运算变换到频域内处理。

Therefore, the time delay estimation of a signal can be obtained based on the correlative principle of periodic series -- circular correlation.

在时延估计的广义相关法中[1 10]，滤波后的传感器输出是互相关的，并将互相关估计取峰值时的滞后取作时延的估计。

It is well known that the multi-value CDMA spreading codes can be designed by means of a pair of mirror multi-rate filter-banks based on some optimizing criteria. The dissertation indicates that there exists a theoretical bound in the performance of its circular correlation property, which can be described by an explicit expression.

研究了基于两带镜像多速率滤波器组来设计的多值CDMA扩展码的方法，并推导出了基于这种方法设计的码序列在循环相关特性方面所能达到的极限，以及达到此理论极限时应满足的条件；在此基础上，提出了一种基于熵最大化准则来产生CDMA扩展码的设计方法。

Based on the comparison with the acquisition algorithm in time domain,the circular correlation algorithm in frequency domain was used for fast acquiring C/A code initial phase and Dopller frequency shift of GPS signal.

在与传统的时域串行搜索捕获算法比较的基础之上，分析了利用FFT实现C/A码初始相位和载波多普勒频移快速捕获的频域圆周相关算法模型。

Based on the conception of hologram simulation, multi-field coupling comprises turbulent fluctuating correlation, time-averaged correlation, circular correlation, bilateral and multi-phase correlation. The coupling mechanism has been discussed in detail.

基于铝电解槽全息仿真的概念，将铝电解槽内的多场耦合问题分为时均耦合、脉动耦合、循环耦合与双向耦合以及多相耦合，对耦合机理进行了详细的分析。

To solv e this problem, a circular correlation method based on FFT for C/A code acquisition was discussed. To improve SNR in weak signal environments, this text put forward a modified acquisition by circular correlation. The analysis and simu lations indicate that the method can make the perˉ formance of acquisition in low SNR improved and verify its validit y.

针对弱信号环境下低信噪比的情况，研究了适合该算法的解决方案，并提出改进的捕获算法，理论分析与实验结果证实了该方法在弱信号环境下具有较好的捕获性能，并能大幅度减少捕获时间。

The result showed that there existed spatial variability of soil nutrients. N, P and K had medium variability, which were mainly affected by routine fertilization measures. On the contrary, Organic matter has a smaller spatial variability; Soil nutrient had semi-variance structure, and model best fit included Circular, Pentaspherical and Exponential. There existed medium spatial correlation in N, P, K and OM.

结果表明，土壤养分性质均存在着空间变异性，受常规施肥措施影响较大的碱解氮、速效磷、速效钾变异相对较大；常规施肥有机质投放较少，变异相对较小；土壤养分性质均存在半方差结构，分别拟合Circular、Pentaspherical、Exponential模型，碱解氮、速效磷、速效钾和有机质均显示中等的空间相关性。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。