We use the term bandwidth to represent such a frequency range. 我们用频带宽度这个词来代表这样的频率范围。
This paper introduces a basic conception of logarithm amplifier and a useful logarithmic amplifier using the chip of AD8313 that has a wide bandwidth, high dynamic range and high accuracy. 介绍了对数放大器的基本概念以及利用AD8313对数放大器集成芯片研制的实用宽带、大动态范围、高精度对数放大器模块。
With the bandwidth of radar increasing, the range resolution is improved. Especially radar of the new system appearing, it enhances the range resolution by transmitting the signal, which possesses large product of time width and bandwidth, and using the technology of pulse compression. 随着雷达信号带宽的增加,其距离分辨力也得到了极大的改善,尤其是新体制雷达的出现,通过发射大时宽带宽积信号,利用脉冲压缩技术,大大地提高了距离分辨力。
It has many potential benefits over conventional current transformers such as enhancement in signal bandwidth and dynamic range, large range of measurement, light weight, lower price, ease of manufacture and so on, so it will be widely used in power electrical system. 空芯电流互感器与传统电流互感器相比,具有动态范围广、测量范围宽、重量轻、价格低、易于实现等优点,在电力系统中有着广泛的应用前景。
The two ultra-high frequency outer antenna sensors are made with wide band and narrow band respectively. The gain of two sensors is both greater than 1 and VSWR of the sensors is less than 2 in effective bandwidth range. 研制了宽带和窄带两种超高频外置天线传感器,两种传感器增益均大于1,驻波比在其有效带宽范围内均小于2,均能用于GIS局部放电超高频检测。
The log-ratio signal processor has properties of low noise, wide bandwidth and wide dynamic range, as well as good linearity response. 系统使用对数比电路完成位置信号处理,具有宽的动态范围和带宽以及好的线性度和稳定的运行性能,而且造价低廉,易实现。
Actual detecting environment is strictly controlled by embattling shape, which directly influences the precision, bandwidth and range of spectrum. 实际测向环境对天线阵的布阵形状要求较严,形状选择的合理与否将直接影响测向精度、测向带宽及测向频谱的范围。
Pulse internal phase coding and pulse external quasi random frequency agile signal is a kind of complex signal which can avoid interference frequency band, increase system bandwidth, consequently increase the range resolution. 本文所研究的脉内二相编码脉间准随机跳频信号是复合信号的一种,可以避开干扰频段,提高系统带宽,从而提高了距离分辨力。
According to the requirements of a lithography exposure system on illumination uniformity, the illumination errors caused by peak reflectivity or bandwidth or centroid wavelength within same range of roughness are discussed. 根据光刻系统对照明均匀性的要求,讨论了在相同粗糙度变化范围内,分别由峰值反射率、带宽和中心波长引起的照明误差。
Most operating radar systems don ′ t have sufficient frequency bandwidth to produce high range resolution ( HRR) profile of a target. But we can use stepped frequency waveform in a narrow band coherent radar to obtain the HRR profile of a target. 大多数现役雷达频带不够宽,不能直接得到目标的高距离分辨(HRR)剖面,但是窄带相参雷达可采用步进频率波形得到目标合成的HRR剖面。
In our country, affected by some factor, such as the net bandwidth, the range of Internet application and the Internet trade environment, the website remote monitor is developing slowly. 在我国,由于受网络带宽、互联网普及程度、网上交易环境等影响,网站远程监控这一行业发展相对较晚。
VHF communication systems which have lower communication costs, equipment simple, wide bandwidth advantages etc, for a wide range of data communications applications in this system. 其中甚高频通信系统具有通信费用低、设备简单、带宽宽等优点,在此系统上进行数据通信有广泛的应用。
Radar range resolution is influenced by its bandwidth, in order to obtain high range resolution, radar must emit wideband waveform. 雷达的距离分辨率与发射信号的带宽成反比,要获得大的距离分辨率,必须发射宽带雷达信号。
However, with the radar bandwidth increases, the range resolution cell is also getting smaller and smaller, and the target becomes distributed target. 然而随着雷达带宽的越来越大,其距离分辨单元也越来越小,目标变为分布式目标。
Consequently, EPON and WiMAX are complementary for each other, the integrated network can take advantage of the two network which provides a access network solution with low cost, high bandwidth and wide cover range. 因此,这两种网络之间有很好的互补性,EPON和WiMAX的融合网络提供了一种低成本、高带宽和高覆盖的接入网解决方案,能充分发挥两种网络的优势。
Such limitations include computation ability, memory capability, power limitation and communication bandwidth and range. Many emerging wireless applications for emergency and military situations depend upon secure group communications. But group key management in sensor networks faces a great challenge because of the resource-limited. 然而由于传感器网络中节点的计算能力、内存容量、电能限制以及网络的带宽、无线传输能力等等的限制,使得传感器网络的组密钥管理面临巨大的挑战。
This dissertation proposed using synthetic bandwidth to improve the range resolution, analyzed the main factors affecting the synthetic bandwidth, and reasearched on the method for signal processing. 针对距离分辨率低的问题,本文提出采用带宽合成的方法提高距离分辨率,分析了影响带宽合成的主要因素,研究了带宽合成信号处理方法。
Wireless communication always demand for more bandwidth, increased coverage or range, increased data rate, decreased interference, and lower costs. 无线通信通常要求增加带宽、覆盖范围和数据传输速率,减小干扰和降低成本。
According to the different bandwidth range, we give the different forms to expand the application scope of the formula and for each realization we give the non-planar structure. 根据带宽范围的不同,给出了应用于不同带宽的实现形式,扩展了公式的应用范围并针对每种形式提出了非平面实现结构,丰富了宽带滤波器的设计。
Acousto-optic signal processing technology with large instantaneous bandwidth, large dynamic range, high gain and high-speed parallel processing capacity had broad prospects for development in an increasingly complex electromagnetic environment. 声光信号处理技术具有大瞬时带宽、大动态范围、高处理增益和高速并行处理能力,因此在电磁环境日益复杂的今天具有广阔的发展前景。
As one of the most effective communications technologies of Access Network, EPON has the advantages of low cost, high bandwidth, flexibility and wild range of services. EPON以其成本低、带宽高、分配灵活和服务范围大的特点,将成为接入网的一种最有效的通信方法。
At the mean time the bandwidth, running speed, the range of data sharing, data security and network security are considered. 在网络建设中考虑网带宽度、运行速度、数据共享的范围、进入网络数据的保密性的确定及网络安全等问题。
The basic requirements of the LNA include: low noise figure, enough power gain, reliable work stability, sufficient bandwidth and the wide dynamic range. 对低噪声放大器的基本要求是:噪声系数低、足够的功率增益、工作稳定性可靠、足够的带宽和大的动态范围等。
Stepped-Frequency Ground Penetrating Radar ( SFGPR) is a continuous wave GPR with good performance both in wide bandwidth and high dynamic range, which can realize high range resolution and deep penetrating detection. 步进频率探地雷达(Stepped-FrequencyGroundPenetratingRadar,SFGPR)是一种连续波体制探地雷达,能同时兼顾大带宽和高动态范围,以保证系统的高分辨率和深层穿透探测性能。
And, according to the analysis of the partition of high resolution range and angle measurement of monopulse, linear frequency modulation signal with wide bandwidth can enhance the range resolution of imaging; while antenna with narrow beam can enhance the azimuth resolution. 同时,根据对高分辨距离单元划分及单脉冲测角的分析可知,采用宽带线性调频信号可以提高图像的距离分辨率,而窄波束天线能够提高图像的方位分辨率,这些结论都在仿真中得到了验证。
Minimum FBE as the genetic algorithm optimization goal, by selecting, crossover and mutation operations, genetic algorithm searches the optimal combination of center frequency and bandwidth within the range, then optimal filter is designed. 以频带熵最小为遗传算法的优化目标,通过选择、交叉、变异等操作,在取值范围内寻找最优的中心频率和带宽组合,设计优化滤波器。
With the drastic development of Wireless Mobile Systems, all kinds of wireless access networks are emerged. Different wireless systems are various in the bandwidth, frequency, coverage range, access technology and modulation. 移动通信迅猛发展,各种无线接入网络层出不穷,不同的无线通信系统在接入方式、覆盖范围、带宽、频率等方面都不尽相同。