Automated cancellation of harmonics using feed forward filter reflection for radar transmitter linearization
US10018707B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 2015 |
| Grant date | Jul 10, 2018 |
| Priority date | — |
| Expiry date | Aug 14, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/35
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A novel methodology for automatically linearizing a harmonic radar transmitter—termed Feed-Forward Filter Reflection (FFFR)—is disclosed. The method combines the reflected second harmonic from a filter with the signal passing directly through the filter. The second harmonic from these two paths are combined with equal and opposite amplitudes to reduce the second harmonic beyond filtering alone. This methodology has been experimentally verified at transmit frequencies between 800 and 1000 MHz. Implemented properly, the technique provides greater than 100 dB rejection between 1.6 and 2.0 GHz. Although the tuning has been automated, further optimization is possible. Automated tuning is demonstrated over 400 MHz of bandwidth with a minimum cancellation of 110 dB. One application for the harmonic cancellation is to create a linear radar transmitter for the remote detection of non-linear targets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.