Direction finding system and method
US7477192B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2007 |
| Grant date | Jan 13, 2009 |
| Priority date | — |
| Expiry date | Mar 18, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/72
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a direction finding system, pluralities of signals provided by different sets of less than all of a plurality of arrayed antennas are code division multiplexed, downconverted by a single receiver, A/D converted and separated to derive signals that are processed to estimate the directions of arrival of the signals received by the different sets of antennas at different frequencies. The signals from different antennas are coded with different codes that have a common M-sequence and different phases for the different antennas. The derived signals are processed to detect the presence of signals and simultaneously demodulate and estimate the directions of arrival of signals by the antennas at the different frequencies. The different sets of antennas from which the received signals are provided for coding and multiplexing are selectively varied in accordance with the estimated directions of arrival and estimated magnitudes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.