Research On Laser Fuze Anti-sunlight Interference Technology

Laser detection equipment is faced with a very complex background light environment,especially the prevalence of unavoidable sunshine background,and sunlight radiation entering the field of view can cause the receiving system to output saturation or reduce system sensitivity.Analysis of the impact of solar radiation on the laser detection system,proposed reasonable anti-jamming measures to improve the system detection performance is of great significance.The paper focuses on the sun interference problem of 905nm laser detection system,based on the theory of spectral radiation,combined with PcModwin atmospheric transmittance software,studies the transmittance of dissipative dielectrics in the atmosphere based on the theory of spectral radiation,combined with the law of blackbody radiation and the theory of radiation flux transmission,and the model of the sunshine radiation was built according to the actual detection system.The whole spectral filtering process of the detection system was analyzed and the detection system spectral response function was established by combining the transmittance of the solar light source,the transmittance of the atmospheric dissipative medium,the transmittance of the receiving system lens,the spectral transmittance of the filter and the spectral response of the detector;The signal-to-noise ratio,detection probability and false alarm probability performance index are derived theoretically,and the influence of different intensity solar radiation on the performance of detection system was analyzed;The mechanism and Simulation of laser detection of sunlight interference suppression are studied from the aspects of receiving mode of echo signal,restraining solar radiation energy and selecting the best threshold;Finally,based on the miniaturized anti shock laser detection system,the experimental platform was built to test the effect of sunlight interference suppression.The experimental results show that the system can increase the signal-to-noise ratio from 9,6.3,4.5 to 31,21.8,15 when the detection range is 6m,7m and 8m.