摘要
为了验证地球同步轨道合成孔径雷达(GEO SAR)的成像机理,采用倾斜地球同步轨道(IGSO)北斗导航卫星作为照射源,通过地面接收北斗导航卫星信号和地面反射的回波信号,实现对GEO SAR成像机理的等效性验证。北斗导航卫星具有与GEO SAR卫星相似的轨道,地面接收的信号可以等效成单程传播的GEO SAR回波信号;成像处理采用与GEO SAR相同的合成孔径时间,在合成孔径时间内地面反射的北斗导航卫星信号具有与单程传播的GEO SAR回波信号相似的距离徙动特性和多普勒特性,可实现长合成孔径时间条件下GEO SAR成像机理的验证。通过双基地试验实现了应用北斗导航卫星信号的GEO SAR成像机理的等效性验证。
In order to verify the imaging mechanism of GEO SAR, by adopting the Beidou naviga- tion satellite as the irradiation source, the equivalence verification can be achieved by receiving the navigation signal and echo signal reflected by the ground. The orbit of the Beidou navigation sate- llite is similar to that of GEO SAR satellite, and the ground reflecting signal can be equivalent to the one-way propagation of the GEO SAR echo signal. The synthetic aperture time of the imaging process is the same as that of GEO SAR, and the ground reflecting Beidou navigation satellite signal within the synthetic aperture time has the same migration characteristics and Doppler char- acteristics as those of the GEO SAR echo signal, which can realize the verification of the imaging mechanism of GEO SAR under the condition of long synthetic aperture time. The equivalence verification of GEO SAR imaging mechanism based on the Beidou navigation satellite signal is achieved through a bistatic experiment.
出处
《航天器工程》
北大核心
2016年第5期19-24,共6页
Spacecraft Engineering
基金
国家自然科学基金(60890073)
