Research On Analysis Methods Of Earth-Observing Requests And Application

That Earth Observing Satellites (EOSs) acquire information of the earth's surface from outer space by using satellite sensors are widely used not only in the social, economic but also many other applications especially such as militay.That users rely on remote satellite for acquiring information has been accelerating, and makes earth observing request more complicated than ever before. The complexity of earth observing requests mainly are: wide coverage in geography,multi-time observeing and multi-fequency detecting. These complexities have bring obstacle for satellite task scheduling such as accelerating complexity of planning, degrading efficiency, low satisfaction of users and unrational use of satellllites and etc. Analysis for earth observing request is pre-part of satellite task scheduling. Both satellite task scheduling efficiency and users'satisfaction can be improved through earth observing request analysis.On the basis of the complexity of earth observing requests, analysis of cohesion and agglomeration for earth observing request was stated and flow model for multi-satellite relay observing was constructed.The main work of this dissertation can be concluded as the following three parts:1. Congsidering the characteristics of observing requests and remote satellites, two models were constructed to describe the earth observing requests and the capability of satellites respectively.The complexity of earth observing requests was listed. After that, two problems, cohesion between earth observing requests and relay observing flow for multi-satellits, were brought out.2. Through analyzing the cohesion between different requests proposed by huge mount of users, coherency measures was used to quantitate the cohesion of each two different earth observing requests. Coherency measures include time coherency, space coherency and frequency coherenc。And then agglomeration between two region-objects or between two point-objects or between point-object and region-object was considered. Later a model for analysis of cohesion and agglomeration for earth observing requests was established. And a hierarchical agglomerative algorithm based on matrix was proposed. Some experiments were implemented to valid correctness and practicability of our method.3. Facing representative multi-satellite relay observing problem, regional object detection and key part surveillance, a flow model based on colored petri net (CPN) was developed after study the theory of Petri Net. Finally, logic of this CPN model was verified based on coverability tree and by simulation test. Finally a reasoning method for multi-satellite observing schema was proposed based on heuristic rules.According to the research works presented above, an experiment system, which has friendly multi-view interfaces of interaction between human and machines, for earth observing request analysis, was designed and implemented as the platform to verify our research achievements.