Synthetic doppler direction finder for use with FSK encoded transmitters
US5945947A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1998 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Jun 25, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/043
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radio direction finder based on the simulated Doppler frequency shift principle is disclosed that is applicable to FSK encoded pulsed transmissions. Typical applications include tracking of stolen vehicles or shipped package tracking. During FSK decoding, all antenna elements of the antenna array are turned on in a non-rotating mode thus eliminating error due to the simulated antenna rotation modulation while providing enhanced gain for the FSK decoder circuit. After decoding a suitable FSK signal, a virtual antenna rotation is enabled, and the bearing is measured during the time interval when the transmitter is only broadcasting a carrier wave.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.