椭圆轨道拱线相位调节方法研究

分析了两个大小相同、拱线不同的椭圆轨道问的轨道转移,研究了单脉冲转移和双脉冲对称转移方法。用遗传算法解决了对称转移方法中最优变轨点的位置确定,获得了对称转移问题的数值解。仿真结果表明：对称转移较单脉冲转移更省能量。     

基于全模式遗传算法的飞行器最佳变轨策略研究

基于最优控制理论建立的飞行器变轨问题数学模型是一个复杂的两点边值问题，传统方法解决该问题经常存在发散等问题。提出的全模式遗传算法具有简单易行、高效的特点，且不需要方程的导数等信息。算例表明该方法非常适合解决此类飞行器变轨问题。     

利用建模工具软件进行系统间电磁兼容性预测分析——性能预测

通过对实际USB系统射频部分的建模和仿真，探讨利用工具软件进行电磁兼容性预测分析——性能预测。     

预测区间技术在航天器数据处理中的理论与应用研究

面对航天领域收集到的大量遥测数据，对其整理、分析就需要运用统计的手段，采用了基于统计推断学的区间参数估计理论的预测区间技术，对传统的模型趋势预测研究进行了拓展。通过对航天数据及其预测模型的深入分析，把握其内在的统计规律，建立了模型预测与区间估计理论相结合的预测区间模型，给出未来数据在一定置信度下的变化区间。最后，将该技术应用于航天器数据预测实例分析，验证了该方法的有效性。     

低轨星座传感器资源实时调度方法

针对低轨星座传感器资源调度问题,提出了一种基于几何精度衰减因子（GDOP）和目标位置估计误差椭球的调度方法,该方法综合考虑了目标的静态、动态定位因素,优先选择卫星目标视线垂直于误差椭球长轴的传感器资源对目标进行跟踪。仿真结果表明,与已有的仅考虑GDOP的调度方法相比,该方法既节省了传感器资源,又提高了目标的跟踪精度。     

Jason-2 DORIS phase measurement processing

The DORIS instrument on Jason-2 is the first of a new generation. The satellite receivers have now seven simultaneous measurement channels, with synchronous dual frequency phase and pseudo-range measurements. These measurements are now described in a similar manner as GPS measurements and an extension of the RINEX 3.0 format has been defined for DORIS. Data are available to users with a shorter latency.     

A genetic algorithm for Initial Orbit Determination from a too short arc optical observation

Optical observations constitute a source of angular measurements of a satellite pass. Commonly, these observations have short durations with respect to the satellite orbit period. As a consequence, the use of classical orbit determination algorithms, as Laplace, Gauss or Escobal methods, give very poor results. The present work faces with the problem of estimating the orbital parameters of an orbiting object using its optical streak acquired by a telescope or a high accuracy camera. In the paper a new technique is developed for the Initial Orbit Determination from optical data by exploiting the genetic algorithms. The algorithm works without restrictions on the observer location. A recent challenging problem is the Initial Orbit Determination with space-based observations. This work focuses on the problem of determinating the orbital parameters of a satellite from an orbiting observer in LEO, using short time observations. We present the results based on a simulation with the observer on a sun-synchronous orbit with a single observation of just 60 s. Monte Carlo simulations are presented with different levels of sensor accuracy to show the reliability of the algorithm. The algorithm is able to yield a candidate solution for each observation. The coplanar case is analyzed and discussed as well.     

模型不匹配时的航空发动机预测控制

1引言一般来说,预测控制适应范围宽,即使在模型不匹配的情况下,也可取得较好的控制性能。但对于航空发动机这样的复杂的被控对象,不采取一定的措施,很难保证所有飞行区域都可取得满意的预测控制效果。以某型航空发动机采用预测控制为例,预测模型不变,在阶跃输入作用下,进行全飞     

顾及轨道误差的GNSS卫星钟差实时估计策略优化

为提高GNSS卫星钟差实时估计精度，针对GNSS各卫星系统的轨道差异，分析各系统卫星轨道误差对钟差估计的影响，基于距离函数线性化二阶残余项的思想，提出了一种顾及轨道误差的权函数模型，以优化实时卫星钟差估计策略。利用全球均匀分布的IGS和iGMAS跟踪站的实时观测数据进行实验，并与GBM的事后精密钟差进行对比分析。结果表明： GPS精度提高率为6.47%，BDS精度提高率为6.46%，GLONASS精度提高率为7.42%，Galileo精度提高率为7.62%。