Phase and time-difference precision direction finding system
US5724047A · kind A · utility
96Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1996 |
| Grant date | Mar 3, 1998 |
| Priority date | — |
| Expiry date | Nov 27, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A precision direction finding system for making precision angle of arrival estimates for a signal received through two antenna elements separated in space. Phase interferometry is used to determine a precise angle of arrival, with multiple ambiguities due to the periodic nature of the phase difference related to geometric angle. The interferometric ambiguities are resolved using the time difference of arrival (TDOA) of the signal at the two antenna elements. TDOA is measured using leading edge envelope detection for simple pulsed signals, and predetection correlation for phase and frequency modulated signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.