传感器与微系统
傳感器與微繫統
전감기여미계통
TRANSDUCER AND MICROSYSTEM TECHNOLOGY
2015年
8期
135-137,141
,共4页
范斌%邓新蒲%杨俊刚%陈军%马超
範斌%鄧新蒲%楊俊剛%陳軍%馬超
범빈%산신포%양준강%진군%마초
天基光学传感器%特征点%安装误差估计
天基光學傳感器%特徵點%安裝誤差估計
천기광학전감기%특정점%안장오차고계
space-based optical sensor%feature point%installation error estimation
卫星在轨运行过程中,载荷姿态不可避免受到平台抖动、传感器热形变等安装误差因素一定程度的影响,导致图像定位精度下降。针对该问题,通过建立相应的安装误差状态转移模型和基于特征点的观测模型、采用扩展卡尔曼滤波( EKF),实现对安装误差的实时估计。采用基于特征点的天基传感器姿态实时校正方法,数学仿真表明:该方法能够实现姿态实时校正,且性能稳定,可有效提高图像定位精度。
衛星在軌運行過程中,載荷姿態不可避免受到平檯抖動、傳感器熱形變等安裝誤差因素一定程度的影響,導緻圖像定位精度下降。針對該問題,通過建立相應的安裝誤差狀態轉移模型和基于特徵點的觀測模型、採用擴展卡爾曼濾波( EKF),實現對安裝誤差的實時估計。採用基于特徵點的天基傳感器姿態實時校正方法,數學倣真錶明:該方法能夠實現姿態實時校正,且性能穩定,可有效提高圖像定位精度。
위성재궤운행과정중,재하자태불가피면수도평태두동、전감기열형변등안장오차인소일정정도적영향,도치도상정위정도하강。침대해문제,통과건립상응적안장오차상태전이모형화기우특정점적관측모형、채용확전잡이만려파( EKF),실현대안장오차적실시고계。채용기우특정점적천기전감기자태실시교정방법,수학방진표명:해방법능구실현자태실시교정,차성능은정,가유효제고도상정위정도。
Payload attitude is inevitably affected by installation error factors such as platform jitter,and sensor thermal deformation error,to some extent,when satellite is in orbiting,that leads to lower precision of image localization. A real-time attitude calibration algorithm for space-based optical sensor based on feature points is presented. Firstly,the state model of the installation error and observation model based on feature points are established. Secondly,an EKF is used to achieve real-time estimation of installation error. Simulation results show that the algorithm can achieve real-time attitude calibration and has stable performance,and can effectively improve the precision of image localization.