Research On The Methods Of Load Sight Determination Based On The Measurement Of Star

The TDI CCD(Time Delayed and Integration Charge-coupled Device) of IR sensors is the key part of the Infrared Camera to detect micro target. The precision of line of sight(LOS) plays the important role of the accurate location tracking of targets. In order to satisfy the actual time of accurate location tracking of targets in infrared surveillance system, we need to effectively the timeliness when dealing with LOS calibration.The technology of line of sight realizes correction through satellite location, satellite posture and the requlation angle of platform. The article set up a mathematic model and analyse error factor of the scanning canera to decrease the error of LOS calibration. The centre is a high accuracy of satellite picking up arithmetic and a adjust arithmetic.The article stretching the research through two parts. First we analyse the model of TDI CCD and put forward a satellite picking up algotithm adapting accomplishing image charater of TDI CCD camera, second we introduce EKF arithmetic based on the characteristics of scanning sensor to realise the precision of line of sight using the estimation of mismatching angles.The structure of this dissertation is as follows:The chapter2 introduces the mathematical model of scan sensor, and studies the imaging model of push broom camera, then analyses the imaging effect of sensor aiming at different kinds of imaging factors in order to calculate the formula influence of the changing of satellite location and posture.The chapter3 analyses the operating principles of TDI CCD and concludes the influence of SNR for different TDI CCD stages, which effect the TDI CCD imaging, and simulation results demonstrate my conclusions, as an example of gauss background and nephelo-complex wave. Then put forward a satellite picking up algotithm adapting accomplishing image charater of TDI CCD camera aiming at the tremble of the satellite terrace leading to image blurring, the case prove that this algotithm can increase the accuracy of centroid picking up.The chapter4 analyses the LOS calibration and introduces EKF arithmetic based on the characteristics of scanning sensor, then puts forward a theoretical calibration model based on the estimation of mismatching angles and establishes the process model of the mismatching angles, and states the technique of the real time estimation of mismatching angles. We set up check-up point and control point to Monte Carlo simulation and compare the timeliness and precision between Least Squared Criterion Model(LSM) and Real Timeless Correction Model(RTCM). Simulation results show that the proposed algotithm can effectively improve the precision of target tracking process in infrared surveillance system and have a base on precondition of accurate location and tracking of targets in array image.In general, the whole research in this dissertation may apply into the target detection of the space-based early warning surveillance system, and can prop up the the precision of target tracking process.