The seismogeodetic technology can detect earthquake caused displacements in real time by combining accelerometers with GNSS instruments. We introduce an in-situ real-time seismogeodetic instrument: Strong Motion Accelerographs with GNSS 2000 (SMAG2000). It adopts a near-real-time smoothing algorithm and advanced loosely- and tightly-coupled algorithms. This study discusses the characteristics of the aforementioned algorithms and evaluates their performance by kinematic experiments. The minimum RMS of the differences between the solutions and the reference motions reaches 0.2 cm and the cross-correlation coefficient is up to 0.99. The smoothing algorithm enhances the accuracy by over 30% relative to the unsmoothed position estimates. A further comparison with other real-time seismogeodetic instruments: Trimble SG160-09, and SIO Geodetic Module and MEMS Accelerometer Package (SIO-GAP), was also conducted. Although the instruments all can monitor vibrations successfully, SMAG2000 has the advantage of realizing different advanced algorithms in situ in terms of possible modes of operation.