Two-way focusing control system and method of optical remote sensor
A two-way focusing control system and method of an optical remote sensor relates to the technical field of the space optical remote sensor. The control system includes two motor drive units, two focal plane position telemetry units, and a focal plane focusing control unit. The two motor drive units jointly drive an external focal plane structure assembly to move axially; the two focal plane position telemetry units are used for detecting an actual axial movement distance of the focal plane structure assembly driven by a linear stepper motor and for transmitting a digital signal to the focal plane focusing control unit; the focal plane focusing control unit respectively transmits a pulse drive signal to the two motor drive units, and determines axial movement synchronization of the focal plane structure assembly driven by the two motor drive units; and when a comparison result shows non synchronization, the focal plane focusing control unit modifies, so that the axial synchronous movement of the focal plane structure assembly driven by the two motor drive units is realized. In the invention, the focusing driving force is large, the occupied space and the structure weight only account for 1 / 2 of a conventional form, and the need of the large width optical remote sensor is especially met. 1. An optical remote sensor two-way the focusing control system, characterized in that it comprises two motor drive unit, two focal plane position telemetry unit, the focal-plane focusing control unit; The two motor drive unit are respectively composed of a linear stepper motor, two motor drive unit together drive the external focal plane structure assembly shaft to the mobile; The two focal plane position telemetry unit are respectively composed of an absolute value of a rotating encoder; a focal plane position with a telematics unit is connected to a motor drive unit, used for detecting the linear stepper motor to drive the focal plane structure assembly in the actual distance of the axial movement, and sending the digital signal to the focal-plane focusing control unit; The states the focal plane focusing control unit includes two motor pulse driving module, a control module and a power module; said control module and the external optical remote sensor is connected to the control platform, and receiving optical remote control platform of a focusing control signal, the control module according to the focusing control signal at the same time to the two motor driving module of the pulse before signal and pulse timing control signal, two motor pulse drive module are respectively to the two motor drive unit transmits a pulse drive signal; the control module receives the two focal plane position remote sensing unit transmits the digital signal, compare the digital signal, judging if two motor drive unit to drive the focal plane structure of the synchronism of the axial movement of assemblies, the non-synchronized, when the result of the comparison, control module through to the corresponding motor pulse drive module can send out the correction drive pulse signal, the motor pulse driving module driving a corresponding corrected motor drive unit, the two motor drive unit to drive the focal plane structure assembly in the shaft to the synchronous mobile; the power supply module is a motor pulse driving module, control module, the motor driving unit and a focal plane position telemetry unit provides the power. 2. Based on claim 1 the two-way optical remote sensor of the control method of the focus control system, characterized in that comprises the following steps: Step one: the control module receives the optical remote control platform of a focusing control signal, the content of the focusing control signal for the focusing distance D; Step two: the control module will focusing distance, N D is divided into; Step three: control module at the same time to the two motor pulse drive module can send the high level signal and the pulse timing control signal, the content of the pulse sequence signal for driving the linear stepping motor D/N the distance of the axial movement of the; two motor pulse driving module receives the high level signal only after the starting, and the pulse timing control signal is amplified as the pulse driving signal is transmitted to the corresponding two motor drive unit; Step four: two motor drive unit together drive the external focal plane structure assembly shaft to the mobile, the focal-plane position telemetry unit detects the actual distance of the axial movement, and sending the digital signal to the control module; a control module to compare the digital signal, judging if two motor drive unit to drive the focal plane structure assembly axial movement of the of the difference in the actual distance of the ΔD; when the ΔD ≠ 0, , a control module to a shaft to move a distance corresponding to a motor drive unit of the motor pulse drive module can send the low level of the signal, at the same time to axially move a distance corresponding to a motor drive unit of the motor pulse driving module to send a high level before signal and a correction drive pulse signal, the ΔD = 0; Step five: repeating step three to four, until the focal plane structure assembly shaft D to the mobile focusing distance, focusing control is completed.