Angle/vector processed, phase-accumulated single vector rotation, variable order adaptive MTI processor
US4137533A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1977 |
| Grant date | Jan 30, 1979 |
| Priority date | — |
| Expiry date | Oct 12, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/526
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In-phase (I) and quadrature (Q) radar return signals are converted to phase to provide phase difference between like range bins of successive pulse repetition intervals (PRI's), the phase differences being reconverted to I and Q format for accumulation across multi-range-bin windows surrounding each range bin to be processed, the normalized range bin accumulations being continuously accumulated in the angle domain, in successive PRI's, to provide clutter phase angle estimates used to rotate incoming target video vectors, a single time, back to the estimated zero-doppler phase of the first PRI of a multi-PRI batch for clutter-elimination filtering. Third-order and fourth-order filtering (utilizing four-PRI and five-PRI batches, respectively), is achieved on a constant one-out-of-four PRI output basis by utilizing the same weighted data for the highest PRI of one fourth-order batch and the lowest PRI of the next higher fourth-order batch, which is rendered possible by the continuous accumulation of estimated phases, over successive PRI's.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.