延伸精度浮点运算 extended precision floating point arithmetic
低噪音高精度运算放大器 low noise high precision calculating amplifier
精度 precision; accuracy; degree of accuracy; precision accuracy; trueness 高精度 high precision; 精度表 accuracy table; 精度等级 accuracy class; class of accuracy; grade of accuracy; grade of precision; precision class; 精度准则 accuracy criteria
运算 [数学] operation; arithmetic; operating 四则运算 the four fundamental operations of arithmetic; 每秒钟运算一千万次 capable of 10,000,000 calculations per second; 运算器 arithmetic unit; arithmetic device; arithmetical unit; arithmetic-logic unit; logic unit; logic-arithmetic unit
In some projects charged by our lab such as national 863 project - " crop planting management components based on weather analyse " , anhui provincial 95 key project - " agricultural meteorology disaster evaluation system base on gis in anhui province " and the project " small coal mine security management and decision system based on gis in anhui province " , this paper combines the theory and arithmetic of rough set with gis and data mining in idss , investiges the application of rough set theory to precision analysis of attribute data and logical operation in gis , analyzes the logical operation based on rough set ( logical union , logical intersection , logical complement , mixed logical operation etc . ) , so that it can give a method y to research the gis attribute data and the uncertainty of attribute data after superposition operator , so as to express the roughness and illegibility of attribute data more accurately 在完成试验室所承担的国家863项目“基于气象分析的农作物种植管理软构件” 、省95攻关项目“基于gis的安徽省重大农业气象灾害测评系统”和“基于gis的安徽省小煤矿安全管理决策系统”等项目中,将粗糙集理论和算法与gis 、智能决策系统中的知识发现等相结合,对粗糙集理论在gis属性数据和逻辑运算精度分析中的应用情况进行了研究,分析了基于粗集的gis逻辑运算(逻辑并、逻辑交、逻辑补、混合逻辑等) ,从而为研究gis属性数据及其叠加运算后属性数据的不确定性提供了一种方法,能比较准确地表达属性数据的模糊性和粗糙性。
The design of speed - , flux - , and current - closed - loop controllers is described . to address the problem that the rotor flux depends heavily on motor parameters , an updated model is presented by combining the strengths of both voltage model and current model . with the updated model , the rotor flux estimation accuracy and robustness to motor parameters are also improved 本文提出了交流感应电机转子磁场定向矢量控制的策略,设计了转速、磁通及电流的闭环调节器,针对转子磁链受电机参数影响误差较大的缺点,采用改进的电压模型和电流模型相结合的方法,提高了磁链观测器运算精度以及对电机参数的鲁棒性。
In the process of making pid control realized , calculating precision is improved by designing software and , designing hardware improves measuring and controlling precision of the system . this strategy is of excellent accuracy and strong robustness . the adjusting results prove that the requirement of technology of the system is satisfied in essence 在对系统的pid实现中,通过软件设计提高运算精度,通过硬件设计改善系统的测控精度,使该控制策略具有良好的控制精度和很强的鲁棒性,调试结果表明基本达到了要求的技术指标。
The digitizer based on pxi bus uses fpga ( field programmable gate array ) to implement 256 points , radix - 2 dit fft ( fast fourier transform algorithm ) . the design uses pipelining for fft processing and can accomplish sampling and processing signals of two channels at the same time . in the signal acquisition circuit , - a / d convector is used to enhance the precision of the signal sampling 在本设计中,采用fpga ( fieldprogrammablegatearray )实现了256点基2dit算法复数fft ( fastfouriertransformalgorithm快速傅氏变换算法)处理器,具有较高的速度和运算精度fft ,设计采用流水线处理方式大大的提高了处理速度,可实现对两个通道输入信号的并行采集与处理。