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Multi-antenna Remote Differential Monitoring System Based on a Single GNSS-over-fiber Architecture
DOI: 10.12000/JR19015
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Abstract
In this study, we designed and demonstrated the performance of a multi-antenna remote differential monitoring system based on a single GNSS-over-fiber architecture. In this system, multiple GNSS signals are received by remote antennas through a microwave photonic link and are then transmitted to local end points. To enable fine positioning, we established a double differential model equation for use between the carrier phase of each remotely received signal and the reference GNSS signal, with the help of the time division mode using a high-speed optical switch. In our experiment, we established a 10 km microwave photonic link among three remote monitoring points. We estimate the resulting positioning accuracy to be within several millimeters and we obtained a response time of less than 10 ms. Compared with traditional single-antenna schemes, our designed system has significant advantages with respect to coverage area, real-time response time, and the performance cost of large-scale monitoring at no cost to the positioning accuracy. As such, this system will find important applications for the monitoring of large-scale civil engineering and natural environments. -
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References
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- Figure 1. Illustration of double difference
- Figure 2. Block diagram of the designed multi-antenna GNSS-over-fiber system
- Figure 3. Experiment for the designed multi-antenna system
- Figure 4. Baseline length and CNR obtained from the monitoring point 1
- Figure 5. Baseline length and CNR obtained from monitoring point 2
- Figure 6. Baseline length and CNR obtained from the monitoring point 3
- Figure 7. Baseline length result and SNR of multi-antenna (Interval of 10 min)
- Figure 8. Baseline lengths and CNR measured by the multi-antenna over fiber system (Interval of 5 min)