Precision doppler effect compensator

Details Precision doppler effect compensator Precision doppler effect compensator

1989-03-22

1990-02-27

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Underwater system

Telemetering

367904, 455 40, 455103, 375 6, H04B 1100

Patent

active

049052110

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.

REFERENCES:
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patent: 4349915 (1982-09-01), Costas
patent: 4428073 (1984-01-01), Verburgt
patent: 4432079 (1984-02-01), Mackelburg et al.
patent: 4513429 (1985-04-01), Roeder

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