Abstract：Abstract：Research purposes：As a new inner geometry parameter of HSR long-wave irregularities, the physical significance and measuring characteristic of 150 m/300 m check are vague. Moreover, owning to its calculation depended on absolute measurement, this method was limited in many applications for track maintenances. At first, this paper discussed the measuring characteristic of 150 m/300 m check by means of harmonic analysis. After, this paper proposed a fast algorithm of 150 m/300 m check based on short chord MCO data and simulated it.
Research conclusions：(1) Harmonic analysis suggest that 150 m/300 m check method has the competence of amplitude measure for irregularities in 60 m or 100 m wavelengh despite of phase difference. But for harmonic waves in other wavelength, this method can lead to distortion of amplitude and phase. (2) Based on the short chord MCO data, the fast algorithm of 150 m/300 m check avoid the measurement of vertical and horizontal deviation and has prominent efficiency superiority compared with absolute measurement. (3)The simulation result of real data proved the correctness and accuracy of this algorithm. (4) These analysis and algorithm could be used in the long-wave irregularities assessment and measurement for HSR .
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