Method for thermal modeling and updating of bias errors in inertial navigation instrument outputs
US5570304A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1994 |
| Grant date | Oct 29, 1996 |
| Priority date | — |
| Expiry date | Jul 27, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/902
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for thermal modeling and updating of bias errors in inertial navigation instrument outputs relies upon piecewise cubic spline encoding of data. The temperature range of the thermal model is divided into contiguous intervals of equal length. Instrument bias-versus-temperature data is encoded on an interval-by-interval basis with all intervals normalized so that cubic polynomials of identical form may be fitted between boundary intervals defined by function values and slopes. Instrument bias error at a measured temperature is estimated in the field and an update point (bias, temperature) established. The particular interval is located and the thermal model is re-fit accordingly in the region of the relevant interval. The spline parameters are then adjusted to accommodate the estimated bias error thereby updating the instrument thermal model of bias.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.