Control device for steerable null antenna processor
US4388723A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1981 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Jul 1, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K2203/32
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A radio receiving system partially overcomes jamming and other interference y receiving on a narrow selected frequency which is rapidly changed, i.e., fast frequency hopping (FFH). The system includes a broadband receiving antenna array and a steerable null antenna processor which creates an antenna null pattern. A control device connected to the (FFH) radio connects a portion of the intermediate frequency (IF) of the radio to a bank of three narrowband IF filters in the control device. The output of the first IF filter, at the IF frequency, provides the signal (S) level and the outputs of the second and third filters, which are offset from the IF frequency, are summed to provide the interference (I) level; the I and S levels being used to control the antenna processor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.