CAJ | 학술논문

提出一种根据轨道根数与TDICCD成像理模拟感器推扫成像过程,实现偏流角计算,并基最终仿真图像的PSF分布评价图像质量的方法,以截止频率MTF为评价标准,研究太阳同步椭轨道的偏流角分布规律.结果表明:与常规轨道相比,近地点幅角为0毅的椭轨道在近地点一侧偏流角与轨道半长轴成线性关系,与轨道离心率成三次函数关系.使用KH-12卫星采用的椭轨道参数进行成像仿真,以穿航MTF下降5%为约束对成像质量进行分析,结果表明:相同推扫级次下,椭轨道近地点一侧的偏流角更小,成像质量更高.
제출일충근거궤도근수여TDICCD성상리모의감기추소성상과정,실현편류각계산,병기최종방진도상적PSF분포평개도상질량적방법,이절지빈솔MTF위평개표준,연구태양동보타궤도적편류각분포규률.결과표명:여상규궤도상비,근지점폭각위0의적타궤도재근지점일측편류각여궤도반장축성선성관계,여궤도리심솔성삼차함수관계.사용KH-12위성채용적타궤도삼수진행성상방진,이천항MTF하강5%위약속대성상질량진행분석,결과표명:상동추소급차하,타궤도근지점일측적편류각경소,성상질량경고.
Drift angle distribution of elliptic solar synchronic orbit was discussed with an image simulating method based on orbit elements and TDICCD imaging mechanism. Image quality was evaluated based on PSF distribution of the simulated final image, and drift angle calculation was carried out. Results show that drift angle of elliptic orbit is linear to half-major-axis and cubic polynomial to orbit eccentricity when argument of perigee is 0o. Image quality distribution aimed at KH-12 camera's critical inclination orbit due to angle drifting in case MTF>0.95 was discussed. Results show that smaller drift angle at neighborhood of the perigee of elliptic orbit and higher image quality can be achieved under same integral number.