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 In this paper, the FokkerPlanck equation for N threelevel molecules having two transition frequencies is derived by operator ordering method. By the equation, the complex distribution function P of threelevel, dual frequency system is determined. The expression for P solution is obtained by solving the characteristic equation. Based on the properties of FokkerPlanck 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FokkerPlanck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FokkerPlanck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 dualfrequency system consists of three subsystems, namely, coherent dualfrequency 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 dualfrequency range rate... The dualfrequency system consists of three subsystems, namely, coherent dualfrequency 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 dualfrequency range rate system resulted from the high frequency channel is in absolute predominance. (2). optimum power division and optimum design method of the dualfrequency range rate system, saving the precious satellite power or improving the range rate measurement accuracy. (3). optimum power division for a dualfrequency system for the same goal of saving power or improving the accuracy of respective subsystems. (4). the optimum design method for a dualfrequency 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 HDY3 dualfrequency 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 HDY3 dualfrequency 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 grainsize.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,HDY3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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