Precision doppler effect compensator
US4905211A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1989 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Mar 22, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/904
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A precision Doppler effect compensator provides Doppler compensation in astic transmission by simultaneously sending a known reference signal with an information signal. The information signal and reference signal undergo identical Doppler effects. The compensator uses the Doppler shifted reference signal to sample the analog Doppler affected information signal. The analog information signals are digitally converted and stored in a first in first out shift register. The samples are read out of the FIFO at a rate corresponding to the frequency of a non-Doppler shifted reference signal so as to precisely reconstruct the information signal as transmitted. The samples read from the FIFO are reconverted from digital to analog form to be presented to a receiving modem for further information processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.