窄带干扰信号对北斗三号B2信号质量的影响

doi:10.12305/j.issn.1001-506X.2022.07.25

Abstract

Abstract:

Since the BeiDou navigation satellite system (BDS-3) was officially launched, and as the space electronmagnetic environment is becoming increasingly complex, and the received signal power is weak, the new B2 signal under strong interference poses new challenges and higher requirements for signal quality. The paper simulated the B2 signal and narrowband interference signal models, analyzed the effects of narrowband interference on power spectrum deviation, correlation loss and S-curve biases (SCB) under different parameters, such as intermediate frequency, bandwidth, and the jamming to signal ratio (JSR). And the real signal data collected by the 40-meter antenna system was used for verification. The results of the study show that the variation of interference signal parameters has a significant impact on the signal quality, and the signal quality deteriorates significantly when the interference environment is harsh, leading to large pseudorange measurement errors and affecting user positioning accuracy. The research results of this paper provide a valuable reference for interference monitoring assessment and signal quality assessment.

Key words: BeiDou-3 navigation satellite system (BDS-3), narrowband interference, signal quality, jamming to signal ratio (JSR)

CLC Number:

TN911.6

Pengbo WANG, Chengyan HE, Qianqian YANG, Wenhua TONG. Impact of narrowband interference on the BDS-3 B2 signal quality[J]. Systems Engineering and Electronics, 2022, 44(7): 2286-2292.

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References 20

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信号	信号分量	载波频率/MHz	调制方式	带宽/MHz	符号速率/sps	相位关系/(°)	功率比/%
B2a	B2a_data	1 176.45	QPSK(10)	20.46	200	0	27.8
B2a	B2a_pilot	1 176.45	QPSK(10)	20.46	0	90	27.8
B2b	B2b_I	1 207.14	BPSK(10)	20.46	1 000	0	22.2
B2b	B2b_Q	1 207.14	BPSK(10)	20.46	未公开数据	90	22.2

干扰中频/MHz	干扰带宽/MHz	JSR/dB
47.5	1.023	-15~12
	2.046	-15~12
	4.092	-15~12
52.5	1.023	-15~12
	2.046	-15~12
	4.092	-15~12

评估参数	干扰中频	干扰带宽	JSR
功率谱偏差	越接近主瓣中心处影响越大	带宽越大影响越大	JSR越大影响越大
相关损耗	越接近主瓣中心处影响越大	影响甚微	JSR越大影响越大, 且在JSR为-14 dB处达到指标临界值
S曲线过零点偏差	越接近主瓣中心处影响越大	带宽越大影响越大	JSR越大影响越大, 且存在超差趋势

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Impact of narrowband interference on the BDS-3 B2 signal quality

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