X-Y double-axis gimbal by X axis transferring D could track objects near zenith, has wider tracking region than regular X-Y double-axis gimbal.

• 偏X-Y双轴式光电跟踪系统可以解决过顶跟踪问题，其跟踪范围与规则X-Y双轴式光电跟踪系统相比有很大提高。