Pulsed radio frequency transmitting and receiving system
US4342998A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1980 |
| Grant date | Aug 3, 1982 |
| Priority date | — |
| Expiry date | Dec 4, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radio frequency transmitter-receiver alternately transmits signal pulses of frequency F.sub.1 and receives return echo signals of frequency F.sub.1. The transmitter signal of frequency F.sub.1 is generated by mixing signals of frequencies F.sub.2 and F.sub.3. A signal of frequency F.sub.3 is generated by mixing signals of frequencies F.sub.4 and F.sub.5. The return signal of frequency F.sub.1 is mixed with frequency F.sub.2 which is continuously generated by the transmitter to produce a signal of intermediate frequency F.sub.3. Frequency F.sub.5 and therefore frequencies F.sub.3 and F.sub.1 are only generated during signal transmission and therefore do not interfere with the return signal of frequency F.sub.1 and the produced intermediate frequency F.sub.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.