Coherent radar
US4538148A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1981 |
| Grant date | Aug 27, 1985 |
| Priority date | — |
| Expiry date | Sep 28, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/524
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A coherent radar including separate transmitting and receiving chains. The transmitting chain includes a master oscillator providing a signal at frequency F0. A multiplier multiplies F0 by a predetermined amount to produce a signal at a frequency F1. A second multiplier multiplies the signal at frequency F1 to produce a signal at frequency F2, F1 and F2 being coherent with F0. A first mixer mixes F1 with F0 and a second mixer mixes F2 with the product of the first mixer to produce a transmission signal. In the receiving chain, a received signal is amplified and filtered and then mixed in a third mixer with the second signal at frequency F2 from the transmitting chain. The mixing product of the third mixer is amplified and filtered and mixed in a fourth mixer with the first signal. The fourth mixer product is then coupled to a processor for producing a radar display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.