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.
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:
| ||Standard INS System||Tactical Grade INS System|
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.