It will inevitably bring motion

which is called forward motion

to aerial images due to relative movement between scenes and sensitive medium. In order to improve aerial image resolutions

the motions must be compensated

so the scene and sensitive medium will keep relative stillness when photographing. First

this paper analyzes causes of image forward motions

relationships between compensation precision and requirements for servo control system

and operations of compensation structure-scanning mirror

then proposes a novel kind of forward motion compensation system using DSP chip

which implements control algorithm digitally. Meanwhile this paper also discusses some critical issues

such as compensation precision

algorithms selection

phase calculation and time constrains in servo control system when using DSP. Finally this paper describes hardware architecture and software flow chart suiting for engineering.