Apparatus and method for channel identification
US4555807A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 8, 1983 |
| Grant date | Nov 26, 1985 |
| Priority date | — |
| Expiry date | Aug 8, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/16
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improvement to a baseband system having a plurality of down converters feeding a single baseband receiver for assuring the same mean time to intercept while maximizing the probability of intercept as a multi-band, autonomous receiver. All channels of the converter unit are operated simultaneously and a unique tag is added to the output signal from each of the down converters whereby the signal can be identified by the balance of the system as to its associated converter. In one embodiment, the tag comprises an amplitude notch appearing on the output signal at a different time following the receiver threshold being exceeded. In a second embodiment, the tag comprises a frequency step added to and/or subtracted from each output signal at the same time following the exceeding of the receiver threshold. In a third embodiment, the tag comprises a phase shift applied to the output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.