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在成象期间,由于目标经过分辨单元的运动,可使距离多卜勒成象系统性能降低。已知距离分辨力d_R、横向距离(方位)分辨力d_A以及波长λ,则为避免图象质量严重降低,图象的距离范围D_R和横向距离范围D_A必须受下式制约: 也就是说,λD_R≤4d_A~2;λD_A≤4d_Ad_R 可成象的矩形区域A≤D_AD_R。应该指出,通常可接受的成象区域是一个平行四边形,只是在无倾斜的侧向运行的特殊情况下才为一矩形。因此,在距离范围D_R和横向距离范围D_A的矩形图范围内的实际有效成象区域,是随着从侧向测得的倾斜角的增大而减少。
During imaging, distance Doppler imaging system performance may be reduced due to the target’s movement through the resolving unit. Knowing the distance resolution d_R, the horizontal distance (azimuth) resolution d_A, and the wavelength λ, the image distance range D_R and the lateral distance range D_A must be constrained by the following equation to avoid serious deterioration of the image quality: That is, λD_R ≤ 4d_A ~ 2; λD_A ≤ 4d_Ad_R Imageable rectangular area A ≤ D_AD_R. It should be noted that the commonly accepted imaging area is a parallelogram, which is a rectangle only in the special case of an undirected lateral run. Therefore, the actual effective imaging area within the range of the histogram of the distance range D_R and the horizontal distance range D_A decreases as the inclination angle measured from the side increases.