The invention discloses a stratospheric
aerostat pressure difference control method, which belongs to the field of flight control, is used for
aerostat pressure difference control, and comprises the following steps: starting an
aerostat pressure difference control program, detecting the
internal temperature condition of an aerostat caused by external environment change, judging whether the aerostat is in a normal environment or not, if so, changing the volume of an
internal phase change air bag, and if not, judging that the aerostat is in the normal environment. If yes, the
internal pressure of the aerostat changes, then whether the pressure difference is within the safety range or not is judged, if not, the volumes of the internal and external
phase change air bags cooperatively change, the
internal pressure change and the height change of the aerostat enable the external
atmospheric pressure of the aerostat to change, and then whether the pressure difference is within the safety range or not is judged; and judging whether the pressure difference is within a safe range, if not, returning to detect the
internal temperature condition of the aerostat caused by the change of the external environment, and if so, ending the pressure difference control method. Under the normal day and night alternation condition, the volume of the
internal phase change air bag is adjusted, the
internal pressure of the aerostat is adjusted, and the internal and
external pressure difference of the stratospheric aerostat is always kept within a safe range.