研究目的
To monitor the stability of bridges under heavy traffic conditions using a Stepped Frequency Continuous Waveform radar.
研究成果
The study demonstrated the feasibility of using a Stepped Frequency Continuous Waveform radar to monitor bridge vibrations with millimeter precision. The method is relatively inexpensive and does not require direct access to the bridge. Future work will involve more experiments with different bridges and structures to further validate the method.
研究不足
The noise in displacement measurements is not normally distributed, and there are instances of very large displacement values due to noise or radar movements. The method requires further validation with different bridges and structures.
1：Experimental Design and Method Selection:
The methodology involves using ground radar interferometry to measure bridge vibrations. The radar sends pulses at a frequency higher than 10Hz, interacts with the bridge, and scatters back to the radar. The phase of the response is related to the distance of the radar to a point on the bridge, allowing estimation of movement between two time instants.
2：Sample Selection and Data Sources:
Experiments were performed under concrete bridges in Milton Keynes, UK, specifically under the road A
3：List of Experimental Equipment and Materials:
4 A Stepped Frequency Continuous Waveform radar with parameters including initial frequency of 5GHz, final frequency of 6GHz, slant range resolution of 15cm, power of 0dBm, and PRF of 33Hz.
4：Experimental Procedures and Operational Workflow:
The radar system was set up under the bridge, and backscattering data was collected and focused. The phase difference between consecutive pulses was used to estimate bridge displacement.
5：Data Analysis Methods:
The data was analyzed using inverse Fast Fourier Transform (iFFT) and coherence estimation along the time axis. Displacement was estimated by converting phase difference into displacement using the wavelength relation.
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