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Accurate estimations of impact flux of debris, relative impact velocity, and impact angle of space debris on an orbit are necessary for reliable design of spacecrafts. Space agencies of some countries have their space debris environment models which can estimate debris flux as a function of the size, relative impact velocity, and impact angle in a spacecraft orbit. However. it is known that the calculation results of models have not been always consistent with each other. In the present. since an estimation result of debris impact depends on the choice of debris environment model, no unified estimation exists in design of spacecrafts. Therefore, international standardization of estimation using the debris environment model is required and the proposal of the international standard is being prepared in Japan. In this paper, as the first step of the international standardization of estimation of debris environment model, we compare the estimation results of debris impact flux in the low earth orbit calculated by three available debris environment models: ORDEM2000 of NASA, MASTER2001 of NASA, and MASTER2005 that is the an upgrade version of MASTER2001. In addition, we suggest a reasonable method using the three debris environment models for the international standardization of spacecraft design.

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Abstract
1. INTRODUCTION
2. DEBRIS ENVIRONMENT MODELS
3. COMPARISON OF DEBRIS ENVIRONMENT MODELS
4. APPLICATION OF DEBRIS ENVIRONMENT MODELS
5. CONCLUSIONS
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