CAJ | 학술논문

多普勒中心频率在星载合成孔径雷达（SAR）成像中,直接影响方位向的模糊度及图像的定位精度。全零多普勒导引方法通过调整偏航角和俯仰角,使多普勒中心频率为零,但现有方法都导致残余多普勒中心频率较大。文章利用椭圆轨道下多普勒中心频率的表达式,将多普勒中心频率分为仅与俯仰角相关部分,以及与俯仰角和偏航角都相关的部分,令两部分分别等于零,首先求得俯仰角,再利用俯仰角得到偏航角,从而有效地减小了残余多普勒中心频率。利用德国＂陆地合成孔径雷达-X＂（TerraSAR-X）卫星参数进行仿真,结果表明：使用文章提出的方法,残余多普勒中心频率约为0.03Hz,远小于采用瞬时圆轨道全零多普勒导引方法的25Hz,从而证明了该方法的有效性。
다보륵중심빈솔재성재합성공경뢰체（SAR）성상중,직접영향방위향적모호도급도상적정위정도。전령다보륵도인방법통과조정편항각화부앙각,사다보륵중심빈솔위령,단현유방법도도치잔여다보륵중심빈솔교대。문장이용타원궤도하다보륵중심빈솔적표체식,장다보륵중심빈솔분위부여부앙각상관부분,이급여부앙각화편항각도상관적부분,령량부분분별등우령,수선구득부앙각,재이용부앙각득도편항각,종이유효지감소료잔여다보륵중심빈솔。이용덕국＂륙지합성공경뢰체-X＂（TerraSAR-X）위성삼수진행방진,결과표명：사용문장제출적방법,잔여다보륵중심빈솔약위0.03Hz,원소우채용순시원궤도전령다보륵도인방법적25Hz,종이증명료해방법적유효성。
Doppler centroid frequency influences the azimuth ambiguities and the location accuracy directly.Total zero Doppler steering method isused to reduce the Doppler centroid frequency to 0Hz by adjusting the yaw and pitch,but residual Doppler centroid frequency still exists.In the paper,the Doppler centroid frequency expression based on elliptical orbit is derived analytically.The Doppler centroid frequency is divided into two parts： one part is related to only pitch,and the other part is related to both yaw and pitch.Assume the two parts are both equal to zero.The pitch angle is calculated firstly,and then the yaw angle is concluded.The residual Doppler centroid frequency is almost 0Hz.The TerraSAR-X satellite parameters are used in the simulation.The simulation results indicate that the residual Doppler centroid frequency is about 0.03Hz,which is much smaller than that of the instantaneous circular orbit total zero Doppler steering,so the new method completes total zero Doppler steering effectively.