The phrase "based on existing knowledge" is correct and can be used in written English.
You can use it to show that something has been derived or built upon information or data that already exists. For example: "Our predictions for the upcoming year are based on existing knowledge of the market trends."
Before robust field and experimental data exists, it is still possible to develop statistical projections for the purpose based on existing knowledge of correlations between climate parameters and human tularaemia cases.
Thus, based on existing knowledge of longevity, a precise figure for the span of human life cannot be given.
It is based on existing knowledge, adapted models and new modules based on experiments and survey data.
The development of this application ontology is based on existing knowledge base, e.g. OntoCAPE in this paper.
This short report is based on existing knowledge and no any text or figure content has been taken from any Holding, or currently applying for patents.
All these phenomena have been explained based on existing knowledge, but further experimental and theoretical studies are necessary to fully understand them.
The study then assessed the health risks that could result, based on existing scientific knowledge about the relationship between radiation doses and its health effect.
Britain also continued to press for the new limits at talks held in September, arguing in favour of rules based on existing scientific knowledge rather than the "precautionary principle" preferred by The Netherlands, Germany, and Denmark, under which products would be banned unless they could be shown to be safe.
In the MPC approach, control actions to a certain system are computed online based on existing system knowledge and future predictions rather than using off-line static results [13].
Several caveats apply to our approach, which is necessarily based on existing, published knowledge.
Finally, we investigated gene-gene interaction using a novel bioinformatics approach that restricts the number of pairwise tests based on existing biological knowledge.
