Research On Key Technologies Of Infrared And Laser Compound Detection

Infrared and laser compound detecting technology is a multi-mode opticaldetecting method, and it consists of infrared imaging, laser distance detected, and ahigh precision two dimensional FSM (fast steering mirror). Infrared imaging is usedto recognize dim moving target and obtain its centroid position, which is used todrive FSM to guide laser pointing to the target. And photon counting technology isused to detect the distance. Finally according the infrared and laser detected results,we obtain the angle-angle-distance information of the target. Early exploratory studyis made to develop the infrared and laser compound detecting technology of futurespace payload.In this paper, the key technology of infrared and laser compound detecting isintroduced in detail, and provide a way to identify the target and calculate itscentroid position from the infrared image sequence, and the UKF (UnscentedKalman Filter) is used to predict the target moving trajectory, and the simulationexperiment is carried out. Also the basic principle of photon counting rang detectingtechnology and piezoelectric FSM is analyzed. The detailed system indicatorparameters and system scheme is carried out in this paper, and the prototype isdeveloped, whose performance and experiment results are presented.The main research work and innovations of this paper are as follows:1. The work mode of infrared and laser compound detection is researched, anda high precision piezoelectric fast steering mirror is used to combine the movinginfrared target position and laser distance measurement;2. Unscented Kalman filter is used to achieve a two-dimensional trajectorytracking about the dim flying target and predicting in the coordinate of infraredimage, and the trajectory predicting is used to reduce laser pointing miss distance.3. The target recognized tests were completed in the parallel light pipe and freespace indoor, and the static target pointing precision is better than0.1mrad. When the target speed is not faster than2.754mrad/s, the laser of system tracking targetprecision is better than0.3mrad.