基于遗传算法选星的高中低轨导航混合星座完好性监测技术

doi:10.11959/j.issn.2096-8930.2023043

Abstract

Abstract:

Low-orbit satellites are widely used in communication, navigation, remote sensing and other fields, which is of great significance to meet the needs of communication and improve the accuracy of navigation and positioning.Integrity technology is an important guarantee for the safe and reliable operation of satellite navigation system.With the mature development of low orbit technology and the gradual application of a large number of low orbit satellites, it is urgent to develop the system integrity monitoring technology under the condition of mixed constellation of high and low orbits.This paper proposed a hybrid constellation integrity monitoring technology for high, middle and low orbit navigation based on genetic algorithm for star selection.On the basis of the traditional optimal geometric accuracy factor selection method, genetic algorithm was introduced to construct a fitness factor based on the linear weighted feature slope of the satellite geometric observation matrix, so as to achieve rapid convergence of user protection level to protection limit.This method further improved the integrity of the receiver by optimizing the way of star selection.Under the accuracy requirement of CAT I, for the ＆quot;BeiDou+StarNet-1＆quot; constellation, the global availability level of the proposed algorithm was 5.60%, and the enhancement effect was the best for the mid-latitude and low-latitude of the Eastern Hemisphere, which were increased by 7.01% and 6.42%, respectively.

Key words: genetic algorithm, receiver autonomous integrity monitoring, high and low medium rail mix, weighted fitness factor

CLC Number:

TN927.2

Zhengcheng WU, Shaojie NI, Wenxiang LIU, Wei XIAO, Zongnan LI. Integrity Monitoring Technology of Mixed Constellation of High, Medium and Low Orbit Navigation Based on Genetic Algorithm Star Selection[J]. Space-Integrated-Ground Information Networks, 2023, 4(4): 61-70.

Figures/Tables 11

References 24

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星座参数	设置
星座参数	StarNet-1(108颗)		StarNet-2(384颗)
轨道类型	LEO	LEO	LEO	LEO
卫星数/颗	108	108	216	60
星座构型	Walker 108/12/1	Walker 108/12/1	Walker 216/12/1	Walker 60/6/1
轨道倾角	50°	50°	50°	86.5°
轨道高度/km	1 150	1 150	1 150	1 175

对比项	方案	高纬地区		中纬地区		低纬地区
对比项	方案	W	E	W	E	W	E
N _sat /颗	Star I	15	16	10	21	11	24
N _sat /颗	Star II	15	16	12	23	11	25
HPL	Star I	12.60	11.15	38.95	10.84	22.16	7.44
HPL	Star II	12.60	11.15	21.54	9.60	19.69	7.22
VPL	Star I	14.28	13.23	34.47	10.56	21.70	9.11
VPL	Star II	14.28	13.23	18.87	9.05	19.38	8.67

方案	高纬地区		中纬地区		低纬地区		全球平均值
方案	W	E	W	E	W	E	全球平均值
Star II	7.32	18.88	16.94	71.87	5.10	75.81	41.94
Star III	7.50↑	19.80↑	17.33↑	76.91↑	4.39↓	80.68↑	44.29↑
表注：↑为数值优化，↓为数值劣化，单位为%

方案	高纬地区		中纬地区		低纬地区		全球平均值
方案	W	E	W	E	W	E	全球平均值
Star Ⅰ	7.32	18.88	7.15	58.52	2.60	71.21	37.47
Star II	7.32	18.88	16.94	71.87	5.10	75.81	41.94
Star Ⅲ	7.50	19.08	17.33	76.91	4.39	80.68	44.29
Star Ⅳ	14.68	34.58	38.10	86.04	10.71	83.96	51.22
Star Ⅴ	15.87	38.13	38.89	90.62	12.30	88.33	55.08
表注：红色为当前区域最大值，绿色为当前区域最小值，单位为%

Integrity Monitoring Technology of Mixed Constellation of High, Medium and Low Orbit Navigation Based on Genetic Algorithm Star Selection

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