Space rendezvous and docking laser radar scanning tracking control system and method

Abstract

The invention discloses a space rendezvous and docking laser radar scanning tracking control system and method. A single-chip DSP is used for establishing a closed-loop control system, and the motion directions and frequency division coefficients of two stepping motors are determined according to the azimuth axis angle value, the pitch axis angle value and the two-dimensional miss distance. The single-chip FPGA is adopted to realize SPWM subdivision driving of stepping motors of a pitch axis and an azimuth axis, and a pitch axis SPWM wave and an azimuth axis SPWM wave are generated according to the motion directions and frequency division coefficients of the two stepping motors; four bipolar H-bridge power drive circuits are used for amplifying the pitch axis SPWM waves and the azimuth axis SPWM waves and then controlling the two stepping motors to drive the azimuth axis and the pitch axis to rotate, and a four-quadrant detector is driven to conduct scanning and tracking. According to the invention, the single-chip DSP and the single-chip FPGA are adopted to realize the subdivision driving and closed-loop control of the azimuth axis and the pitch axis based on the stepping motors, and the required control function and performance index are realized under the condition of not adding additional control chips and sensors, so that the circuit and the structure are simplified, and the requirements of space application are met.

Description

technical field

[0001] The invention relates to the technical field of scanning and tracking control, in particular to a scanning and tracking control system and method for a space rendezvous and docking laser radar. Background technique

[0002] In space rendezvous and docking, lidar is a major measurement device. The working principle of the laser radar is: the laser sends a single pulse laser (that is, the main wave), and the laser returns to the original path after hitting the cooperative target; the detector receives the laser echo, measures the time difference between the main wave and the echo, and calculates the target Straight-line distance to radar. According to the azimuth and elevation angles emitted by the laser, combined with the straight-line distance, the position of the target in the polar coordinate system centered on the radar is obtained.

[0003] Due to the strong directivity of the laser, the divergence angle of the beam and the acceptance angle of th...

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