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 dual frequency system 双频系统(1)
 双频系统
 By the equation, the complex distribution function P of three-level, dual frequency system is determined. 三能级双频系统的缔合分布函数P_ζ由这一方程确定. 短句来源
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 Novel Dual－Frequency Lasers 几种新型双频激光器 短句来源 FREQUENCY 生死频率 短句来源 Study of profilometry with dual-frequency grating 双频光栅轮廓术的研究 短句来源 Adaptive Straightness Measurement System with Dual Frequency Laser 自适应双频激光准直系统的原理及实验 短句来源 Study on Dual-PWM Vector Control Variable-Frequency System 双PWM矢量控制变频调速系统的研究 短句来源

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 In this paper, the Fokker-Planck equation for N three-level molecules having two transition frequencies is derived by operator ordering method. By the equation, the complex distribution function P of three-level, dual frequency system is determined. The expression for P solution is obtained by solving the characteristic equation. Based on the properties of Fokker-Planck equation the average population inversion as a function of time and interaction is formulated, 本文用编序算符方法推导出了具有两个跃迁频率的N个三能级分子的Fokker-Planck方程.三能级双频系统的缔合分布函数P_ζ由这一方程确定.用特征方程方法解出了P_ζ的表达式.利用Fokker-Planck方程的性质求出了平均粒子数反转随时间和相互作用变化的显函数. The dual-frequency system consists of three subsystems, namely, coherent dual-frequency Doppler tracking, data transmission and telemetry. It has been widely used in the field of space flight and is still in progress. However, some parts of its theory as well as the optimum system design as shown in the paper were never seen in the published literatures. This paper gives the concept and equations about: (1). Composite (random) error of a dual-frequency range rate... The dual-frequency system consists of three subsystems, namely, coherent dual-frequency Doppler tracking, data transmission and telemetry. It has been widely used in the field of space flight and is still in progress. However, some parts of its theory as well as the optimum system design as shown in the paper were never seen in the published literatures. This paper gives the concept and equations about: (1). Composite (random) error of a dual-frequency range rate system resulted from the high frequency channel is in absolute predominance. (2). optimum power division and optimum design method of the dual-frequency range rate system, saving the precious satellite power or improving the range rate measurement accuracy. (3). optimum power division for a dual-frequency system for the same goal of saving power or improving the accuracy of respective subsystems. (4). the optimum design method for a dual-frequency system including a very fast and convenient graphical method. 双频系统含有双频多普勒测速、数传及遥测三个分系统。本文提出双频组合(随机)测速误差、测速分系统的及整个双频系统的最佳功率分配等概念和公式,最佳设计方法和一个简便迅速的图解法。利用此法可将双频系统发射机耗功降至最小值,或反言之可提高有关分系统的精度。 The first performance of Frequency Domain Aeroelectromagnetic method (FAEM) for investigating shallow water resources in China came to the success.The geological and geophysical prerequests of FAEM are briefly described,with the technical conditions discussed.It is pointed out that medium scale aeroelectroma;jnetic survey using HDY-3 dual-frequency system is a rapid,economic and effective rechniqut to map saline water,fresh water and brackish water.FAEM can also be used to investigate... The first performance of Frequency Domain Aeroelectromagnetic method (FAEM) for investigating shallow water resources in China came to the success.The geological and geophysical prerequests of FAEM are briefly described,with the technical conditions discussed.It is pointed out that medium scale aeroelectroma;jnetic survey using HDY-3 dual-frequency system is a rapid,economic and effective rechniqut to map saline water,fresh water and brackish water.FAEM can also be used to investigate the relative abundance of fresh water,paleosedimentary environment and soil grain-size.And the way for improving the FAEM method is discussed. 用航空电磁法进行浅层水资源调查的试验研究,并取得显著成效,在我国还是首次。本文简述了该方法的地质、地球物理前提与技术条件。并指出,HDY-3型双频航空电磁系统,用中比例尺进行航测,在平原的“有咸水”水文地质分区中,圈定咸水、淡水、半咸水,是一种快速、经济而有效的新的水文物探手段。该方法不但能划分咸、淡水及半咸水的界线,还能预测淡水的相对富水程度、研究古沉积环境和土壤粒度。文中还讨论了充实和改进该方法的途径。
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