In the traditional solution to the SAR problems, the earth often adopts circular model and the orbit adopts elliptical model. This often brings error to the calculations.
在传统的星载sar问题的研究中，地球采用球模型，轨道采用圆轨道模型，这给星载sar问题的计算带来了一定的误差。
Abstract : When using the Range-Doppler model for SAR image geometric correction, the error of satellite orbit, imaging parameter and DEM elevation will affect the geometric correction accuracy.
摘要 ：使用距离多普勒模型进行SAR影象几何校正时，卫星轨道误差、系统成像参数误差和DEM高程的误差会影响几何校正精度。
Positional and attitude error dynamics model of small satellite relative to a target satellite was derived, then the desired relative orbit and desired attitude of small satellite were designed.
建立了小卫星相对轨道和姿态的误差动力学模型，根据作业任务和姿态指向要求确定了小卫星相对轨道和姿态的期望运动；
Chapter 3 analyzes numerically the effects for orbit calculation caused by orbital perturbation, parameter error and so on. A precise mathematical model of orbit calculation is given.
第三章通过数值法分析了各项轨道摄动和参数误差等因素的对轨道计算的影响，给出了精确的月球探测器轨道计算数学模型。
The result shows that using velocity measuring data after error correction in preliminary orbiting computation can effectively improve the orbit determination precision.
计算结果表明，使用经各种误差修正后的测速数据参与初轨计算能有效提高定轨精度。
In the free flight segment, effects on the state error propagation caused by prior state estimation errors and orbit determination errors of the chasing spacecraft were studied.
在自由飞行段，分析了追踪航天器估计状态误差的先验值和测轨误差对状态误差传播的影响。
On one hand, this result supports those researchers who are engaged in qualitative error sources analyses are liable to employ circular orbit assumptions;
这一结果支持了目前无线电掩星定性误差估计研究中通常引入卫星圆轨道假设这个近似处理方法的合理性；
Based on the target's phasing time analysis of orbit determination error, orbit control error and orbit prediction error, the strategy of the target's phasing orbit maneuver was developed.
基于定轨误差、轨道控制误差和轨道预报误差的调相时间分析，制定了目标飞行器调相控制策略。
The bit error probability of CDMA in non-geostationary orbit mobile satellite system is analysed.
分析了非静止移动卫星通信中CDMA的误码性能。
The bit error probability of CDMA in non-geostationary orbit mobile satellite system is analysed.
分析了非静止移动卫星通信中CDMA的误码性能。
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