1989 Vol. 14, No. 2
Based on the main criterion of sensitivity a new method of SOD for the monitoringnetworks is proposed in this paper. Through theoretical study and analysis of examplesit shows that this method is feasible and more effective than the optimization methodaccording to precision criterion. The developed program can be used for the optimizationdesign of both classical and free monitoring networks.
Based on the theory of stochastic media, the formulae of terrene dynamic deformationby mining have been derived. According to the formulae two models of the Kalman fil-tering and adapative filtering fitting for dynamic data processing are established in thispaper. The parameters in the formulae, as the state vector of the filtering models, areestimated simultaneously. The dynamic predictive accuracy of two models is higher thanthe tranditional methods, and the model of adaptive filtering can improve the predictiveaccuracy significantly.
A New approach to arrange the approximate epipolar lines for SPOT images, refer-red to as the polynomial fitting method, is presented in this paper. With this method,it is not necessary to know any parameters of SPOT images and the terrain elevationinformation in advance. This paper detailly discusses the theory and the operation proce-dure. This new approach is proved to be effective and correct by the theoritical analysisand the experiments.
This paper discusses the grasslands classification principle for grass resources investi-gations and the realization in computer processing. The method for using the auxiliarydata and the image data composition technologies are described.A real date example of thegrasslands resources investigations with a larger area in Northern Tibet has been shown.
A set of recursive formula of the function of inclination of the satellite orbit isbased Yanghui's formula of the binomial coefficients introduced. Its distinguishing fec-tures are:(1) that it is convenient to be applied due to its simplicity; (2) that the de-rivatives of high order of the functions can be calculated; (3) that it is easy to be un-derstood, because the mathematical method employed is elementary.
In this paper, the formulas for computing geoid undulation and vertical deflection are modified by some special techniques. It has obviously quickened the convergence speedof the summation terms, and decreased the truncation error. A new method for deter-ming oceanic geoid from gravity anomaly using Hotine function has been worked out. The accuracy of geoid undulation computed in this paper is better than 1 meter;systematic differences between seasat geoid and oceanic geoid are at the half-meter level. From the geoid charts some correlation of the oceanic geoid with ocean bottom to-pography has been shown, that the main characteric of the oceanic topography can berepresented by the oceanic geoid.
The trigonometric levelling is a method of height measurment developed in recentyears. At present the investigation of the feasibility of trigonometric levelling to replaceprecise level in many other contries is with the help of test. This paper analiesed thefeasibility of trigonometric levelling to replace 3 order level in theory based on thespecific condition in China. Moreover, through the practice test it would obtain someuseful conclusions.
On the basis of analysing main sources of topographic map errors, some sample to-pographic maps published at 1:100000, 1:200000, 1:500000 and 1:1000000 scalesare measured, and a method which evaluates accuracy of topographic maps is proposed,the accuracies for topographic map series are discussed according to map details, forexample, graticule intersections, river and road crosses, central points of settlements,etc. Finally, some recommendations for the planimetric accuracy standards are suggestedfor national topographic map series at medium and small scales.
It's a efficient way to realize the modernization of the production management byusing the simulated display device to introduce the information of the production siteswhich are in bad conditions to the offices. This paper discusses four problems of thedesign of a simulated display device briefly.
This paper compares two silicon-controlled rectifier circuits. An inverse parallelcontrolled silicon is connected with the anode transformer in these circuits. The protective methods of the over voltage and over current of the circuit areintroduced and some calculated formulae and experimental data for the rectifier areprovided.
In this paper, a new space of martingales——aΣp is more broadly defined. Itsequivalence relationship with aLp space of martingales mentioned by Herz is establishedand the relationship is extended to the Young's convex function of moderate increments.The paper also gives some more results for other parallel spaces of martingales.
In this paper, a mathematical model is set up for college and university graduatejob assignment based on fuzzy theory. The weight sequencing of elements is determinedby hierarchy analysis. The fuzzy distribution is established by means of trapezoidal dis-tribution, which results in a more scientific and reasonable job assignment for collegeand university graduates free from human interference. In the paper, instances are citedto illustrate this method, which has been proved feasible and reliable.
This paper theoretiacally analyses the characteristics of freenet combined bundleadjustment in close range photogrammetry. The photographic data of Cassegrain antennain a satellite ground station have been processed and adjusted with the developed softwarepackage SAP-B. The better accuracy of point position is obtained.