| The successful launch and return of Shenzhou-VI, marks that our aerospace technology has entered the era of large-scale near-space exploitation and utilization.In the near future, the technology is directly expected to serve for national economy.In order to develop the space experiment and research on its application, it is imperative to build a permanent space station.,where rendezvous and docking plays an important role.Meanwhile, the technology of the rendezvous Lidar is pivotal for rendezvous and docking. Rendezvous Lidar information measure system scheme has been set up in our research, and its feasibility is verified by computer simulation.1 . In measuring distance, two common methods:pulse -counting and phase-shifting are compared and analyzed. we analyze and compare analog intervene method and time delay method according to their measuring precision and the measuring blind area to improve the measuring precision.2.Doppler frequency shifting and curve fitting differential methods for measuring velocity are analyzed and compared . The least-squares curve fitting methods based on power functions and orthogonal functions are analyzed and compared.3 . Analysis and study for angle measuring schemes is conducted.The performances of QD,PSD and CCD which are commonly used for optical spot location are analyzed and compared.4 . Through our research, the whole measuring scheme is finalized for pulse-counting method with analog intervene chosen to measure distance, the differential coefficient method based on the least-squares curve fitting based on power functions chosen to measure velocity and QD optical spot location method chosen to measure angle . With the orientation and distance information having been measured, measurement of 3-D(three dimensional) information of targeted spacecraft, i.e. its location 3-D information (x,y,z) and velocity 3-D information ( v_x , v_y ,v_z) have been simulated .5.Computer simulation for rendezvous laser information measuring system... |
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