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零后的第一个完整的材料,PRF给予优先释放。Zero after the first full release of materials, PRF grant priority.
在雷达导引头中经常采用高PRF倒置接收体制。High PRF and inverse receiver are often used in radar missile guidance.
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脉冲重复频率全球公司是美国公司设在加利福尼亚州亨廷顿海滩,加利福尼亚州。PRF Global Inc is a U. S. A. Corporation located in Huntington Beach, California.
通过仿真,研究了对PRF线性时间误差的补偿方法。The compensation for PRF time linear error is given with the simulation result presented.
仿真验证了模型的有效性和要求的合理性。The simulation enunciates the validity of the model and the reasonableness of the PRF precision requirement.
满足检错、纠错条件的多重PRF可获得与单重PRF一样高的测距精度。If the conditions are satisfied, multiple PRF can be obtained with its precision being the same as a single PRF.
该算法对数据进行子孔径划分,可降低系统对PRF及运算存储量的要求。The algorithm divides echo-wave data into several sub-apertures data to reduce demands of PRF and memory of system.
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可分选出的信号有抖动信号、重频参差、频率捷变及频率分集信号等。This method is suitable for identifying PRF jittering, PRF staggering, frequency agility and frequency diversity etc.
因此距离-速度的二维可检测区图才是衡量重频选取好坏的重要标准。So the map of range-velocity detectable zone is in fact the criterion of evaluating the quality of the selected PRF set.
提出了一种基于时间、空间和频率的三维联合控制的高重频脉冲遮盖压制干扰技术。The obscuration Jamming of high PRF pulses based on jointly controlled in the domains of time, space and frequency is presented in this paper.
PRF取自患者自身血液经离心后制得,制备时间短,操作过程简便,较之富血小板血浆有更好的生物安全性和生物活性。Compared with platelet-rich plasma, PRF is acquired from the patients themselves, need less time to prepare, and have better biosecurity and bioactivity.
因而对重复频率的选择可模型化为解大规模组合优化问题,而模拟退火算法正是解这类问题的一种有效方法。So the medium PRF set selection can be modeled as a large scale combinatorial optimization problem, the problem can be solved by simulated annealing algorithm.
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总结上述两个阶段的临床研究结果,并结合复习文献,对PMCT和PRF的局部消融作用和侵袭性等作初步比较。Summarizing the results of the above stated two clinical researches, a preliminary comparison between PMCT and PRF in local ablation effect and invasiveness was made.
试验结果表明,采用固态开关串联完全可取代传统的真空管开关,在高重频的大功率雷达发射机中稳定可靠工作。The transmitter test results indicate that solid state switches could replace traditional vacuum switching tube and work reliably in high PRF high power radar transmitter.
利用单多卜勒雷达径向速度的PPI资料,使用模式识别技术自动探测台风中心。Based on a PPI of radial wind data from a single Doppler radar with double PRF technique, model recognition technique is utilized to detect center of typhoon automatically.
主要讨论弹载SAR脉冲重复频率的设计问题,简要介绍了弹载合成孔径雷达工作的几何关系,说明了PRF设计需要考虑的一些因素。This paper discusses the design of PRF of missile-borne SAR. The geometric model of missile-borne SAR is introduced and some factors related to the design of PRF are showed.
针对地面低空雷达应用PD体制的杂波重叠问题,提出了分时分重频的设计方法。Aimed at the clutter overlap of PD system applied to the ground-based low altitude radar, a designing method of a different PRF with respect to each interval of scanning time was proposed.