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RDR-3200 User Manual
8.4 NMEA Output Message
9 Calibration of DR
9.1 Self calibration of DR
RDR-3100 calibrates the Gyro bias and odometer scale using the information of GPS
satellites automatically. It also updates the position and azimuth using GPS navigation
information automatically. Customer is not required to calibrate the Gyro bias and odometer
scale factor. In respect to the position and azimuth angle, RDR-3100 DR provides a
protocol, which is used to calibrate the position and azimuth angle using digital map.
9.2 Calibration Criterion
•Keep vehicle in static with 15 seconds at least after power on to retrieve gyro initial bias
•During normal operation, the calibration of gyro and odometer scale take place
automatically during periods of good GPS reception. 9.3 Calibration of DR using
digital map information
The DR is used to output the navigation data when GPS signal is absent or
poor. The longer time of losing GPS signal, the Gyro precision and odometer
would become worse. The best way to have better DR performance is to use
the digital map information. Once the map matching completed, it could
provide useful information for DR algorithm to continuously output the
accurate navigation information as possible. The PROYRESET is designed for
this purpose. Navigation application can reset the DR position and COG
especially when no or poor GPS signal occurs. Because digital map provides
very accurate and stable positioning information, to get longer and more
accurate DR output, please use PROYRESET to achieve it.
9.4 Gyro Electric Characteristics
Gyro Chipset - Panasonic EWTS86
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