In 2017, the MTi 4th generation MTi was replaced by the 5th generation MTi. The reasons for the redesign are migration to new accelerometers, barometer and magnetometer sensors, with an improved system design reflected in a significant increase of the Mean Time Between Failure (MTBF). The result is that the 5th generation MTi's are more robust with improved performance.
This article describes the migration from the 4th generation to the 5th generation MTi. If you have any questions, leave a comment or ask your Field Application Engineer (FAE).
The 5th generation MTi's can be recognized by the DeviceID (or Serial Number). The last 4 digits of all 5th generation MTi's are higher than 2000 (i.e. 03702001 is the first MTi-300).
MTi configurations available only with ±20g accelerometers
The 5th generation MTi configurations will be supplied with ±20g high dynamic range accelerometers only. This configuration shall provide improved and consistent system performance in navigation and control applications. The MTi parts with ±5g configurations will be discontinued for the 5th generation MTi. The new 5th generation MTi with ±20g accelerometers will inherit the product codes from the ±18g accelerometers.
The performance of the ±20g is significantly better than the performance of the ±5g and ±18g accelerometers from the 4th generation. Below are the Allan Variance plots of all three accelerometers (12 devices per Allan Variance plot). The left plot is the MTi 4th generation accelerometer (5g configuration), the middle plot is the MTi 4th generation accelerometer (18g configuration) and the right plot is the MTi 5th generation with 20g accelerometers. Each plot has a solid line (representing the mean) and dotted-dashed lines representing the 1-σ values across the sample size (N=12). The MTi 5th generation has a lower noise compared to the 5g and the 18g variant used in the MTi 4th generation. The tighter 1-σ bounds in the MTi 5th generation accelerometers points to the consistency and the repeatability of the error-characteristics of these sensors. Use of this sensor makes the 5th generation MTi more robust with consistent performance.
Figure 1 – The Allan variance curves of the accelerometer sensors used in the 4th and the 5th generation of the MTi 10/100 product series. The left and middle plot show the Allan variance curves of the 5g and 18g variant of the accelerometer sensors used in the 4th generation respectively. The Allan variance curve of the accelerometer used in the 5th generation is shown in the right plot. The tighter 1-σ bounds points to the consistency and the repeatability of the error-characteristics of the MTi 5th generation accelerometers.
No legacy mode support
For the 5th generation of MTi, the MTDATA2 will be the only supported data output format along with specific string mode support (NMEA). MTDATA output format will be discontinued and as a consequence ‘Legacy’ mode support will no longer be available and provided.
Mean Time Between Failures Improvement (MTBF)
For the 5th generation of MTi, after thorough and careful review of all component specifications, certain tolerances and packages were revised with the intention of making the MTi more robust. This entire effort has resulted in a more robust MTi for the 5th generation with a 50% increase to the MTBF of the previous generation.
The MTi 5th generation will only be supplied with the MTi-G-710 variant of the GNSS/INS system replacing the MTi-G-700 available in the 4th generation. The MTi-G-710 comes with GPS/GLONASS/Beidou support. Beidou becomes only available in the 5th generation of the MTi-G-710.
The MTi-G-710 is delivered with a GPS/GLONASS PCTEL 8117D antenna that has the same footprint, same size, and identical screw-hole locations as that of the GPS PCTEL 3910D antenna which is now supplied with the MTi-G-700. The MTi-G-700 will be discontinued.
For GPS/GLONASS/Beidou, Xsens has tested the Tallysman Wireless 4721.
The magnetometer in the 5th generation of MTi is replaced with a new magnetometer that has an improved performance to the one used in the 4th generations. This was necessitated due to the EOL of the 4th generation MTi magnetometer part. The improvements are increased sensitivity, a higher fill range and a lower noise characteristic.
The barometer in the 5th generation MTi is replaced with a new barometer that is a successor to the one that is currently in the 4th generation MTi. The new barometer has increased performance. This applies only to the MTi 100-series and MTi-G-710 for the 5th generation of MTi products.
MTi-OEM 14 pins interface header replacement
For the MTi 5th generation, the 7x2 (14 pins dual row) box header of the MTi 4th generation is replaced by a 3x2 (6 pins dual row) box header. Pin 1 location (x,y) and all other pin functions remain unchanged.
1 PPS pulse and SyncIn changes
The MTi-G-710 of the MTi 5th generation will feature a pulse per second (1 PPS), coming directly from the GNSS receiver. This feature is for system integrators that require stable and accurate timing information. The redesign means that the (bi-directional) SyncIn/SyncOut line will be replaced with a SyncOut line only for the MTi 10-series and MTi 100-series. The SyncIn and ClockSync lines will not change. See the table below for available functionality and lines.
Processor MTi 10-series
The processor of the MTi 10-series has been upgraded to accommodate new features. Therefore it may be possible that features in firmware versions designed for the 10-series in the MTi 5th generation may not work on 4th generation MTi 10-series.