A new method to concurrently detect the vibration and distance with a beam-steering antenna is proposed. Unmodulated CW Doppler vibration radar is able to detect the distance to the target with a fast-switching beam-steering antenna. An adaptive beam-steering 2 × 2 phase-array antenna is developed for a 5.8-GHz Doppler noncontact vibration radar system. The antenna with -27°to +20°beam-steering angles shows 85°coverage for detection. The size of this adaptive beam-steering antenna is exactly the same as the original 2 × 2 fixed-beam antenna. This adaptive beam-steering antenna with electronic switches provides 0.83-ms fast-switching rate for steering the beams. Furthermore, different dc offsets due to different propagation paths are measured under different beam-steering angles. The distance to the target can be accurately extracted with less than 8% error by analyzing the dc offsets of the baseband signals at different beam-steering angles. This system successfully detects the architectural deformation caused by a seismic simulator.
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Nieh et al. (2015) studied this question.
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