Spread spectrum frequency hopping reader system
US5828693A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1996 |
| Grant date | Oct 27, 1998 |
| Priority date | — |
| Expiry date | Mar 21, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/71365
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus for sourcing an interrogation signal for use in a object identification system including a frequency hopping source for generation of an interrogation signal which is coupled to a homo dyne radio for transmission by a bi-directional antenna to a tag. Upon receipt, the tag provides a return signal that is backscatter modulated to include tag identification or other data which is processed by the sourcing system. The frequency hopping source includes a voltage controller oscillator which is driven by a pseudo random code generator for selecting one of a plurality of hopping frequencies at which the interrogation signal is to be generated based on the available bandwidth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.