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MeasurementAccuracy / AttitudeAccuracy-INSOptionOnly

Attitude accuracy (INS option only)

SPEEDBOX-INS Attitude Accuracy Test

In order to test the accuracy of the SPEEDBOX-INS attitude measurements (roll, pitch and yaw) we hired a reference INS system in the form of a navigation-grade RLG IMU paired with two military GPS receivers providing both standard GPS and GPS compass information. Additionally, the reference system GPS solution was post-processed with corrections gathered at a reference station, resulting in a cm-level accuracy GPS solution aiding the tactical-grade IMU. The complete reference system cost in excess of $500k.

Both the reference system and the SPEEDBOX-INS were fitted to the testing vehicle, and data collection began.

Open-sky high dynamics test

This test benchmarks the SPEEDBOX-INS during high dynamic manoeuvres under open-sky conditions (good GPS reception). These conditions would be applicable to many tests for which the system is aimed including stability testing, slip angle measurement and vehicle dynamics development. In a large clear area a number of circles in both directions, a slalom and figures of eight were driven. This test was repeated several times.

The headline 1-sigma comparison figures for both the standard SPEEDBOX-INS and the tactical grade SPEEDBOX-INS versus the reference system during this test are shown below:

Representative yaw, pitch and roll output from the standard SPEEDBOX-INS is shown below compared to the reference solution.

Yaw output (SPEEDBOX-INS compared to reference)

Pitch output (SPEEDBOX-INS compared to reference)

Roll output (SPEEDBOX-INS compared to reference)

Distribution of difference in measurements between the reference system and the SPEEDBOX INS.