![]() ![]() TLS and GB-RAR acquisitions are simultaneous. In contrast, the high spatial resolution of TLS measurements provides an accurate description of oscillation amplitude along the tower, which cannot be caught by the GB-RAR, due to its poorer spatial resolution. GB-RAR measurements are used to measure the vibration frequencies of higher oscillation modes which are not caught by the TLS due its lower precision in the measurement of displacements. ![]() The amplitude and frequency of the main oscillation mode of the whole structure are derived from the TLS profiles. By interpolating the points of each line, oscillation profiles are estimated with a much better precision than each single point. Acquisitions of the surface of the tall structure are performed by the TLS with a high sampling rate: each line scan provides an instantaneous longitudinal section. The methodology provides both natural frequencies and oscillation amplitudes of tall structures. This article presents a methodology for the monitoring of tall structures based on the joint use of a terrestrial laser scanner (TLS), configured in line scanner mode, and a ground-based real aperture radar (GB-RAR) interferometer.
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