合成孔径激光成像雷达(Ⅲ):双向环路发射接收望远镜

Synthetic Aperture Ladar(Ⅲ):Circulated Duplex Telescope

提出了一种用于合成孔径激光成像雷达的双向环路结构的发射接收望远镜,双向环路包括发射4-f转像系统、接收4-f转像系统和独立的望远镜。发射通道中设置离焦和相位调制平板偏置,接收通道中设置离焦和相位平板偏置。控制发射离焦量,发射相位调制函数,接收离焦量,接收相位调制函数,用同一个望远镜可以同时实现空间二次项相位附加偏置的激光发射和消除目标点散射回波接收波面像差的离焦光学接收,并产生雷达运动方向上合适的和可控制的相位二次项历程,从而实现孔径合成成像。详细介绍了系统设计,给出了从发射到光电外差接收的全过程传输方程。

A kind of circulated duplex telescope for synthetic-aperture laser imaging radar is presented, in which a circulator connects among a reception-channel 4-f system with defocusing and phase biasing, a transmitting-channel 4-f system with defocusing and phase biasing and a primary telescope. By controlling the biasing functions and the defocusing amounts of both channels it is realized with a single telescope to receive the echo with its aberration eliminated and to transmit a beam with an additional quadratic phase. As a result, a suitable and controllable phase history can be generated to correctly synthesize the image in the azimuth-direction. The designs as well as a full transmission equation are detailed in the paper.