Helmet metal mass compensation for helmet-mounted sighting system
US4394831A · kind A · utility
72Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1981 |
| Grant date | Jul 26, 1983 |
| Priority date | — |
| Expiry date | Feb 12, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2005/027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic system for determining the orientation including position of a helmet worn by a pilot is disclosed having a transmitting antenna for transmitting electromagnetic field vectors, a receiving antenna for sensing the electromagnetic field vectors generated by the transmitting antenna, and a control apparatus responsive to the sensed electromagnetic field vectors and the transmitted electromagnetic field vectors for determining the compensated orientation of the helmet, the compensated orientation relying upon the rotation matrix determined by a previous solution for the orientation of the helmet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.