一种分布式卫星系统基线优化设计方法

doi:10.12305/j.issn.1001-506X.2023.08.16

Abstract

Abstract:

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.

Key words: ground moving target indicator (GMTI), output signal-to-clutter-plus-noise ratio (SCNR), location error, optimal baseline

CLC Number:

TN957

Ruixian HU, Zhao ZHANG, Cheng LUO. A baseline optimization method for distributive satellites system[J]. Systems Engineering and Electronics, 2023, 45(8): 2423-2437.

Figures/Tables 11

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系统参数	具体数值
卫星数目	2
目标与天线的斜距/km	761
CNR/dB	13
SNR/dB	13
卫星速度/(m·s^-1)	7 500
天线长度/m	9
卫星间距范围/m	50~1 000
波长/m	0.03
径向速度/(m·s^-1)	[-35, 35]

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A baseline optimization method for distributive satellites system

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