Research On Critical Technologies For Air-borne Opto Electronic Stabilized Platforms

The air-borne opto_electronic stabilized platforms has developed rapidly andhas been used widely in the military area and civil area, fire protection, surveillanceand control of environment etc. because of auto reconnaissance on the mobile aim bythe imaging. Commonly, the stabilization of the platforms depent on the stancechange, vibration and the moment of the wind resistance of the plane. To improvethe precision of the stabilization and reconnaissance, we did in-depth analysis onthree critical researches on the quality of imaging, and make solving project andexperimental verification by emulator or experimentation.Firstly, in order to increase the control efficiency and imaging quality of themethod by PID control, we used some critical variable to set up model by themodern control theoretics, and made analysis on the sigle-rate sampled-data velocitycurve. We made experimentation what contrast PID control with new method, whichmade of state observer and feedback control. It increased the stabilizing precisionfrom38.60%to57.28%by the new method.Secondly, the piezoelectric gyroscop which was the critical organ in theplatforms control system has been used widely, because of the optics fibre gyroscopwas bad at big volume, high cost and instability supply. But it has disadvantage onthe big yawp and what yawp level and bandwidth were influenced by acceleration information. It has been filterined with kalman by linear accelerometer, which coulddispelled influence. It could clear up the white yawp abundantly keeping on the goodbandwidth which was at least phase. It decreased the yawp level from0.005°/s/HZ to0.00125°/s/HZ, and the high frequency phase43degree comparing withtwo rank Butterworth.Finaly, the opto_electronic stabilized platforms searched target on big visualfield. It tracked the target on the small visual field when the target has beendiscovered. The capability of the imaging and tracking has been affected by planestance changing. We made filterin on the GPS position information of the showingtarget by the method of active showing by adaptive kalman filterin. It deducedmeasuring equation and math model of showing angle. It made analysis on theprecision of the GPS data and active showing angle with MATLAB by Monte-Carloidea. It increased the precision of the latitude data47.62%, longitude data47.36%,and the height above sea level52.38%after been dealed by adaptive kalman filterin.It made half physical emulator experimentation, and increased the precision ofshowing pitching angle44.19%, showing azimuth angle37.82%and the totalshowing angle40.38%. It proved that increased effectively the precision andcapability of tracking by this method.In this paper, we have solved the idiographic problem on the quality of imagingon the opto_electronic stabilized platforms in the practical work. we have increasedthe stabilization by the new method, which included state observation and addedstate feedback control by the theory of modern servo control, and have increased theprecision of collecting data by the method of kalman filterin with the linearaccelerometer, and have increased the precision of reconnaissance by the methodof the GEO showing by adaptive kalman filterin. we provided the applying base forthe farther development and in-depth research on the opto_electronic stabilizedplatforms Based on this paper.