一种分布式卫星系统基线优化设计方法

A baseline optimization method for distributive satellites system

分布式卫星星座系统的地面运动目标指示(ground moving target indicator,GMTI)性能取决于输出信杂噪比(signal-to-clutter-plus-noise ratio,SCNR)、定位误差及其他参数。提出了一种新的分布式卫星系统最优基线设计方法。在理想杂波假设下分析了不同速度运动目标的输出SCNR,然后推导了定位误差的表达式。考虑到输出SCNR和定位误差都是沿航向基线的函数,可利用长短基线结合的方法来提高GMTI性能,进而提出一种同时考虑速度响应和定位误差的最优基线搜索方法。此外,详细讨论了基线误差的影响,以确定所提出的方法的GMTI性能是否受到基线误差的影响。最后,通过仿真结果验证了该方法的有效性。

The ground moving target indicator(GMTI)performance of a distribute satellites constellation system depends on the output signal-to-clutter-plus-noise ratio(SCNR),location error and other parameters.A novel baseline optimization method for distributive satellite system is proposed in this paper.The output SCNR of moving targets with different velocities are analyzed with the ideal clutter assumption,and the expression of the location error is then derived.Since both output SCNR and location error are the functions of along-track baseline,combing long and short baselines can improve the potential GMTI capability.As a result,a strategy for determining the optimal baseline is proposed taking both the velocity response and location error into account.Moreover,the influence of baseline error is discussed in detail to determine whether the GMTI performance of the proposed method is affected by the baseline error.Finally,simulation results are provided to validate the effectiveness of the proposed method.