Direct Detection Of The Ranging Characteristics Of The Laser Diode Radar Study

Laser diode devices is becoming more sophisticated. provide a compact, low-cost and high-repetition detection light source for the development of new laser range finder, which pour new energy into the field of laser radar research. Compared to the traditional Q-laser, laser diode has lower pulse peak power, slowler rising time, which makes the characteristics of laser diode radar ranging are quite different from traditional solid laser radar. So,this paper presents a more universal characteristics of the laser diode ranging evaluation system, and studies on laser diode characteristics of radar ranging in theory and experiment.In In theory, we establish simulation of the stochastic model,which depend on a distance-based laser diode radar ranging process. The simulation is developed in the MATLAB environment and verify the correctness of the model from experiment. The model can consider the influence of system parameters such as theshold level and bandwidth, and working conditions such as atmospheric transmission characteristics reflection characteristics of the target, target distance to radar ranging. On this basis, through ranging simulation experiments, we identify the influence of threshold level, the system bandwidth and target reflection characteristics characteristics of laser diode radar range. In the experiment, we build the laser diode radar ranging system, and use of the devices under different conditions of a large number of fixed-point ranging experiments. Experimental results show influence law of the threshold level, the system bandwidth and target reflection properties and so on to characteristics of laser diode radar ranging in the numerical simulation results is correct. The results show that:in the low SNR conditions, the discrete distribution of the laser diode radar ranging data will significantly deviate from the normal distribution; while keeping other parameters unchanged, with increase of threshold level and system bandwidth and keep ranging parameters steadly.the parameters of characteristics of laser diode showed decreases and increases in law, there is an optimal threshold level and system bandwidth. In this paper, the best threshold level and system bandwidth is 500mV and25MHz.In summary, the results of the research shows important reference value for optimum design of ranging laser diodes radar and follow-up three-dimensional reconstruction and analysis of target data.