CAJ | 학술논문

利用TDI CCD成像数值仿真模型，研究了TDI CCD测量系统的测角精度随扫描镜速度稳定度的变化规律。首先根据TDI CCD推扫成像的物理过程，建立了数值仿真模型，设计了从光学像和扫描镜稳定度到数字图像的仿真链路；然后利用图像重心计算方法求取图像中心坐标并得到目标点的角位置坐标；通过蒙特卡诺法进行海量打靶试验，对结果进行统计得到扫描镜各稳定度水平上的测量精度值；最后将某工程样机的扫描镜速度稳定度带入仿真模型，仿真结果表明：测试误差增大5.67μrad，达到了像元角分辨率的1/4。在光学测量系统的系统设计时，需要考虑像元分辨率及扫描镜稳定度的综合影响，选用合适的扫描镜稳定度要求，使测量角分辨率满足用户需求。
이용TDI CCD성상수치방진모형，연구료TDI CCD측량계통적측각정도수소묘경속도은정도적변화규률。수선근거TDI CCD추소성상적물리과정，건립료수치방진모형，설계료종광학상화소묘경은정도도수자도상적방진련로；연후이용도상중심계산방법구취도상중심좌표병득도목표점적각위치좌표；통과몽특잡낙법진행해량타파시험，대결과진행통계득도소묘경각은정도수평상적측량정도치；최후장모공정양궤적소묘경속도은정도대입방진모형，방진결과표명：측시오차증대5.67μrad，체도료상원각분변솔적1/4。재광학측량계통적계통설계시，수요고필상원분변솔급소묘경은정도적종합영향，선용합괄적소묘경은정도요구，사측량각분변솔만족용호수구。
Numerical simulation model of TDI CCD imaging is used to study the relationship between the speed stability of the scanning mirror and angle measurement accuracy in a TDI CCD measurement system .First, based on the physical process of TDI CCD push-broom imaging , a numerical simulation model is established to describe the whole process from optical image and scan mirror stability to digital images , and then gravity cen-tre of image is calculated and the target angular coordinate is got;Monte Carlo method is used to complete a simulation experiment , and the statistical results could describe the relation between stability of the scanning mirror and measure accuracy .In the end , the speed stability of an engineering scanning mirror is substituted into the simulation module , and the simulation results show that the error increases by 5.67μrad, reached 1/4 of pixel angular resolution.So in high-precision measurement, the comprehensive influence of the pixel an -gular resolution and the speed stability of the speed stability need to be considered .The appropriate speed stabilityof the scanning mirror showed be chosen to meet the requirement of pixel angular resolution .