GPS Jamming and GPS Carrier-Phase Time Transfer

被引:0
作者
Yao, Jian [1 ,2 ,3 ]
Weiss, Marc [1 ]
Curry, Charles [4 ]
Levine, Judah [1 ,2 ,3 ]
机构
[1] NIST, Time & Frequency Div, Boulder, CO 80305 USA
[2] NIST, JILA, Boulder, CO 80305 USA
[3] Univ Colorado, Boulder, CO 80305 USA
[4] Chronos Technol Ltd, Stowfield House, Lydbrook, Glos, England
来源
PROCEEDINGS OF THE 47TH ANNUAL PRECISE TIME AND TIME INTERVAL SYSTEMS AND APPLICATIONS MEETING | 2016年
关键词
VIEW;
D O I
暂无
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
This paper studies the impact of GPS jamming on GPS carrier-phase time transfer. To study this issue, at NIST, we have installed a commercial GPS jamming detector since 2014 April. During 2014 April - 2015 April, the detector detected more than 100 jamming events, though there had been a few outages of jamming detection. The jamming events usually last for less than 2 min. We find that almost all jamming events lead to a significant drop in the L1 signal-to-noise ratio (SNR) for all observable GPS satellites. Another thing we notice is that the 3 GPS receivers which are closer to Broadway, a main street in Boulder, Colorado, are more likely to be jammed. This indicates that the jamming source may come from cars passing by. Although a jamming event causes a significant drop in L1 SNR, the GPS receiver can still track the GPS satellites properly for most cases. However, sometimes, the jamming can be too strong and then a GPS receiver may lose track of some GPS satellites. This leads to a GPS-data anomaly. Because of this anomaly, the carrier-phase time transfer processing re-estimates the phase ambiguities at the anomaly. Thus, there is often a time discontinuity at the anomaly. The discontinuity ranges from a few hundred picoseconds to a few nanoseconds. Then the next question is what we shall do when a jamming event occurs? Our earlier study [1] shows that the 9th-order polynomial curve fitting for the code and phase measurements can repair a short-term data anomaly (< 40 min). We apply this technique to repair the anomaly at jamming and it works well. Thus, we can eliminate the impact of a short-term jamming (< 40 min) on carrier-phase time transfer by repairing the GPS data.
引用
收藏
页码:80 / 85
页数:6
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