The error of atmospheric structure explore equipments in common is bigger
based on the change principle of the resonance frequency of microwave resonant cavity when the medium enters into it is different
digital tester about atmosphere duct is designed.The experiment confirms that the tester can precisely explore atmospheric structure that the common equipment can’t get.This equipment has the character of high precision
high response speed and so on.So it lays the foundation for the ships radar and the communications system to realize over the horizon propagation.