Direction finding apparatus
Abstract
Abstract THERE IS PROVIDED DIRECTION FINDING APPARATUS COMPRISING A PLURALITY OF ANTENNAE FOR DERIVING SIGNALS FROM A SOURCE, THE BEARING ANGLE OF WHICH IS TO BE DETERMINED, MEANS FOR PRODUCING A LOCAL OSCILLATION THE FREQUENCY OF WHICH IS RELATIVELY LOW COMPARED WITH THAT OF THE DERIVED SIGNALS, HALL EFFECT MODULATING MEANS FOR PRODUCING OUTPUT SIGNALS PROPORTIONAL TO THE DERIVED SIGNALS MULTIPLIED BY FUNCTIONS OF THE LOCAL OSCILLATION AND MEANS FR PRODUCING AN INDICATION OF THE BEARING OF THE SOURCE IN RESPONSE TO THE OUTPUTS OF TEH MODULATING MEANS. IN TWO FORMS OF THE INVENTION HALL EFFECT ELEMENTS ARE INCORPORATED IN EITHER A ROTATING FIELD RESOLVER OR A GONIOMETER, WHEREBY THE ELEMENTS OPERATE AS BALANCED MODULATORS FOR PRODUCING OUTPUT SIGNALS PROPORTIONAL TO THE CURRENT THEREIN MULTIPLIED BY FUNCTIONS OF THE LOCAL OSICLLATION AND OF THE RESOLVER ANGLE OR THE GONIOMETER ANGLE RESPECTIVELY.
Inventors
- 👤 Bertrand Julian Starkey
- 👤 John Osborne
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |