Chord measurement is a widely-used method of inspecting track irregularity at present. But the theoretic defect restricts its response to shorter wavelength. Based on the analysis of the frequency characteristics, a multi-chord measurement theory and a data compensation method have been proposed. According to the irregularity band, an suitable combination of different chord length has been found to avoid amplitude gain to be zero. In order to get the original value, Fourier transform can be utilized on the compensation of measurement data in the frequency domain. The data simulation and test results show that this method is able to calculate rail short-wave irregularity precisely. Thus, it is suitable for engineering application.
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