ISO 14200:2021 pdf download – Space environment (natural and artificial) — Process- based implementation of meteoroid and debris environment models (orbital altitudes below GEO + 2 000 km).
5.2.5 When selecting an environment model, consideration should be given to the fact that there can be significant differences in the calculated fluxes among the available candidate models. The customer and/or the supplier should compare the fluxes of several models. See A.3 and B.3. NOTE The choice of model to be applied depends on the mission objectives and requirements of the customer (and the supplier, if necessary). For example, to achieve adequate safety margin in the design of a spacecraft or its subsystems, it is reasonable to select the model with the highest flux values when analysing the risk caused by space debris and meteoroid impacts. This ensures that the worst-case scenario is evaluated. On the other hand, in the case of in situ debris sensor design, the worst-case scenario is achieved by using the model that generates the lowest impact flux values, since it results in the smallest observation opportunity. Finally, when selecting the operational orbit of a spacecraft by comparing the impact flux for each candidate orbit, the model can be chosen according to criteria other than the magnitude of its flux values. This is because the analysis involves relative fluxes. 5.3 Implementation procedure 5.3.1 Traceability of the implementation of the meteoroid and space debris environment models shall be assured, including during all design and operation phases, if applied to a spacecraft. 5.3.2 When applying a model to calculate meteoroid or space debris impact fluxes, a record of the following shall be kept: a) the justification of the selected model; b) all input and output parameters and their values for each analysis case; c) any assumptions made regarding the input parameters and the technical justification for the assumptions; d) any corrections and/or additional assumptions made to output parameters, their technical justification, and details of correction methods and their effects on the results. NOTE Output parameters can be corrected by applying a safety factor, life factor or margin of safety.