Firstly,the definition of detectability was presented,which is a new physical quantifier used to describe the difficulty level for detecting a target. Analysis was given to the influence of target flight altitude and velocity on its detectability in infrared band and the regularity of detectability changing was obtained based on a mount of simulating calculations. The analysis result shows that: 1) Under normal weather condition the active detecting range will increase by 5 km for the same infrared detector...
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