Sculling compensation in strapdown inertial navigation systems
US5890093A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1996 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Nov 1, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/188
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention is a method and apparatus for compensating for sculling in a strapdown inertial navigation system. The method operates on a sequence of inputs .DELTA.V.sub.B (n) derived at times n.DELTA.t from the outputs of one or more accelerometers. Separately compensated quantities .DELTA.V.sub.Bc (m,p) calculated at times (pJ+1/2).DELTA.t for M values of m are obtained by summing A(m,k).DELTA.V.sub.B (pJ-j-k) over k from 0 to K-1 and over j from 0 to J-1 where the constants A(m,k) are chosen to minimize sculling error in the individual .DELTA.V.sub.Nc (m,p) quantities where .DELTA.V.sub.Nc (m,p) is the representation of .DELTA.V.sub.Bc (m,p) in the navigation frame of reference. The final compensated quantity .DELTA.V.sub.Bc (p) is obtained by summing B(m).DELTA.V.sub.Bc (m,p) over m where the constants B(m) are chosen to minimize sculling error in .DELTA.V.sub.Nc (p) where .DELTA.V.sub.Nc (p) is the representation of .DELTA.V.sub.Bc (p) in the navigation frame of reference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.