地形遮挡对GNSS干扰范围影响的高效仿真算法

doi:10.3969/j.issn.1001-506X.2020.11.02

Abstract

Abstract:

In the simulation of satellite navigation countermeasure effectiveness, the simulation calculation for the influence of terrain occlusion on the interference range of the global navigation satellite system (GNSS) interference source in real geographical environment is an important problem. In general, the calculation of the influence of terrain occlusion on GNSS interference range is obtained by the algorithm based on the line-of-sight viewshed analysis, but there are a lot of redundant calculations in this method. In order to reduce the amount of calculation, an efficient simulation calculation method of GNSS interference range based on the viewshed analysis of reference surface is proposed. The reference surface is established by using the auxiliary grid point corresponding to the visual elevation value near the interference source and target point. The interference situation of the target point is judged by the mapping elevation value of the target point and the actual elevation value of the reference surface, which avoides the interpolation calculation of multiple sampling points in the line-of-sight direction between the target point and the interference source. Simulation analysis shows that when the radius of the area to be analyzed is about 145 290 m, compared with the traditional simulation method of GNSS interference range based on the line-of-sight viewshed analysis, the Matlab time consumption is greatly reduced by 97.38%, but the results difference is not obvious, only 0.94%. Therefore, the proposed method can efficiently and accurately calculate the GNSS interference range under the influence of terrain, and provide theoretical guidance for the optimal deployment of interference sources and battlefield environment simulation analysis.

Key words: terrain blockage, global navigation satellite system (GNSS) interference source, viewshed analysis

CLC Number:

TN972

Dan LIU, Xiaozhou YE, Wei XIAO, Wenxiang LIU, Feixue WANG. Efficient simulation algorithm for the influence of terrain occlusion on the GNSS interference range[J]. Systems Engineering and Electronics, 2020, 42(11): 2418-2425.

Figures/Tables 11

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场景编号	接收机抗干扰能力(干信比)/dB	组别序号	GNSS干扰源个数	干扰源位置坐标	干扰源自身高度/m	干扰源频率/Hz	干扰源发射功率/W	发射天线增益/dB	接收信号功率/dBm	接收天线增益/dB
1	30	1	1	29.37°N, 110.44°E	100	1 575.42e6(L1)	10	10	-130	0
2	60	1	1	29.37°N, 110.44°E	100	1 575.42e6(L1)	10	10	-130	0
3	90	1	1	29.37°N, 110.44°E	100	1 575.42e6(L1)	10	10	-130	0
		2	3	29.38°N, 110.47°E	50	1 575.42e6(L1)	700	10	-130	0
				29.39°N, 110.46°E	78	1 575.42e6(L1)	500	10	-130	0
				29.37°N, 110.46°E	150	1 575.42e6(L1)	1 000	10	-130	0

场景编号	组别序号	计算得出待分析区域DEM格网行列值	待分析区域半径/m(分辨率约为30 m)	Matlab耗时			结果差异百分比/%
场景编号	组别序号	计算得出待分析区域DEM格网行列值	待分析区域半径/m(分辨率约为30 m)	传统基于视线的算法/s	本文算法/s	减少百分比/%	传统基于视线的算法	本文算法
1	1	9 687×9 687	145 290	42 829.181	1 124.234	97.38	0	0.94
2	1	1 177×1 177	17 640	471.513	14.590	96.91	0	2.70
3	1	39×39	570	0.296	0.226	20.27	0	7.54
	2	311×311	4 650	46.089	3.468	92.48	0	4.49
		263×263	3 930	46.089	3.468	92.48	0	4.49
		373×373	5 580	46.089	3.468	92.48	0	4.49

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Efficient simulation algorithm for the influence of terrain occlusion on the GNSS interference range

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