Radio beacon phase modulator
US5446466A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1993 |
| Grant date | Aug 29, 1995 |
| Priority date | — |
| Expiry date | May 12, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S1/0428
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A phase modulator for a position indicating radio beacon which includes a digital memory circuit having a plurality of sets of stored numerical amplitude values with each set corresponding to a sine wave of a given phase and with at least three values in each set. A selection circuit selects phase values from the memory circuit in steps between a predetermined angular range in response to input data and, for each phase value, transfers the set of amplitude values in series at spaced apart time intervals to a digital to analog converter. A high frequency filter has an input coupled to an output of the digital to analog converter such that a sine wave is produced at an output of the high frequency filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.