Method of determining position and/or direction of a magnetic target
US6307365A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1999 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Mar 12, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/85
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining position and/or direction of a target, where the target has a series of magnetic poles with a magnetic pole spacing d. The method includes the steps of: (A) providing an array of an even number N of magnetic sensors with a sensor spacing x, the sensor array having an initial effective sensor array length (N+1)x, where the initial effective sensor array length is greater than the pole spacing d; (B) deactivating an equal number of magnetic sensors such that the magnetic sensors of the array remaining active are adjacent to each other and provide a new effective sensor array length that is closer to the pole spacing d than the initial effective sensor array length; (C) dividing the magnetic sensors of the array remaining active into two equal groups A and B of at least one adjacent magnetic sensor for signal processing; (D) summing the signals from group A and summing the signals from group B; (E) adding the summation of signals from group B to the summation of signals from group A to obtain a sine wave; and (F) subtracting the summation of signals from group B from the summation of signals from group A to obtain a cosine wave.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.