Computation of safe separation on cross track

It investigates initially inverse problems of collision risk models, which compute the safe separation through establishing a model under the condition of a given safe target grade. First, improve models of the existed collision risk models on the crossing track, and get across-track computing safe separation improved models. Secondly, establish the same step iterative arithmetic based on the features of improved models, use it to compute separation value of the improved model and the arithmetic is simple and practical for improved model calculations. Lastly, simulate it on two cross route in ShangHai airspace, then compare them to the actual flight separation rules and analyze them after getting results, and give the suggestion on reducing separation.