The Mathematic Models of the Kalman Filtering for Across-Fault Measurement

This paper makes a probe into the application of the Kalman filtering method to the data processing of across-fault measurements.On the basis of statistical regression,the mathematic and stochastic models of filtration are established by combining the regression method with Kalman filtering.In the filtering computation,not only the randomness of fault movements but also the time-dependent variation of environmental effects have been taken into consideration.By use of the adaptive filtering method,an estimation of the dynamic noise variance matrix is obtained through iteration.Models for one measuring line(leveling line or baseline),two measuring lines(both leveling lines or both baselines)and four measuring lines(two leveling lines and two baselines)are derived and established systematically.By means of these models,the data of across-fault measurements can be processed dynamically in real-time to provide the filtered values of height difference between benchmarks or baseline length at different time in     

Relocation of Hypocenters in the Bohai Sea and Adjacent Areas

In this paper a method of relocating hypocenter in inhomogeneous medium is introduced.Based on the velocity from the latest results on the crust and mantle structure of the Bohai Sea and its adjacent areas,by using the data recorded in Shandong,Hebei,Beijing,and Liaoning networks around the Bohai Sea we apply the method to relocate hypocenter parameters of 598 events occurring in the Bohai Sea and its adjacent areas.The accuracy of hypocenter relocation is discussed.We present the results of events ML≥4.0 in the Bohai Sea in recent years and discussed the distribution of focal depths.     

IMPLICIT NONLINEAR NORMAL MODE INITIALIZATION:A MULTIGRID APPROACH

The implicit nonlinear normal mode initialization (INMI) is applied to a tropical limited area shallow water modelin spherical coordinates.The boundary condition for the INMI scheme is based on the boundary formulation of themodel.The INMI scheme is found to be very efficient in suppressing spurious gravity wave oscillation and providing awell balanced initial data set for the model.The INMI scheme involves solving a number of elliptic type equations withvarying complexity.and hence an efficient numerical technique is required for solving such equations.In order to makeINMI computationally more attractive,we are employing the multigrid method for solving all the elliptic type equationsin the INMI scheme.The numerical procedures for the development of such multigrid solvers are briefly described.     

1992年夏季苏州持续高温及其中期预报

分析１９５１年以来苏州夏季高温以及持续高温与厄尔尼诺、亚洲经向环流指数、副高强度指数的关系，１９９２年夏季根据ＧＭＳ卫星云图所反应的厄尔尼诺状况和其他因素，对日本９６－１９２小时的数值预报进行修正，准确及时地作出了持续高温的中期预报。     

船舶气象导航随船验证

通过横流太平洋往返两个航次随船调查，研究了采用气象导航对减少燃油消耗和保证船舶安全、班期等，不但有定的经济效益，而且是一种非常有效的航运管理方法。     

低纬和中高纬度火山爆发与我国旱涝的联系

根据５００年旱涝等级资料，采用时序迭加方法，分析了低纬和中高纬火山爆发对我国降水的影响。此外，还对１６００－１９７９年南方涛动指数的变化进行了类似的分析。结果表明，低纬和中高纬火山爆发发后全国旱涝分布型和部分地区降水变化趋势有很大差异。爆发当年华北就可能明显变旱，而次年长江流域才出现明显的降水异常。计算不明，１９９１年皮纳图博火山及去仙岳火山爆发与江淮特大洪涝有直接联系的可能性不大。     

旱直播水稻的农业气象条件研究

通过１９９０年，１９９１年连续两年的分期播种试验，分析了旱直播水稻的光温特性及其与空秕率的关系，并根据当地气候特点，提出旱直播水稻的最佳及安全播种期和抽穗期。     

一种新的地图数据检索方法及其应用软件

本文提出了一种新的实用地图数据检索方法——“放大镜”式地图数据检索,建立了相应的软件系统,并讨论了该方法的数学基础、软件的特点,还给出了应用实例。     

以可区分度量为准则进行变形监测网的优化设计

本文采用变形模型可区分度量的概念进行监测网的优化设计。在算法上采用计算机模拟逐一更新的计算过程。为了克服常规模拟法需要人工干预的缺点,引进了一些规则,利用计算机的判断和推理过程,达到了自动设计的目的。作为示范例子,文中最后还给出了一个模拟监测网的设计结果。     

CCD相机二维几何检校

CCD 相机检校是 CCD输入影象处理的一个必不可少的过程。本文对 CCD成象系统的几何性能进行了分析,提出了测定 CCD影象象素比例因子和象主点初值的简易实验方法。在此基础上,构造了一种同时顾及光、电误差的二维检校方法,井进行了相机检校实验。最后对检校结果进行了分析和讨论。