Dynamic filter tuning for pulse-echo ranging systems

Details Dynamic filter tuning for pulse-echo ranging systems Dynamic filter tuning for pulse-echo ranging systems

2006-11-21

2006-11-21

Lobo, Ian J. (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

C367S098000, C367S099000

Reexamination Certificate

active

07139220

ABSTRACT:
Dynamic tuning of a tunable filter within the receiver of a pulse-echo ranging system. A filter tuning module compares a transmit signal and a filtered signal to obtain a phase difference indicative of any mis-match between the resonant frequency of the tunable filter and the transmit frequency. The filter tuning module outputs a phase correction signal corresponding to the phase difference and a controller uses the phase correction signal to determine any adjustments necessary to minimize the phase difference. Adjustments to the tunable filter may be made with each ‘shot’ or transmission.

REFERENCES:
patent: 4197750 (1980-04-01), Hassler
patent: 4204280 (1980-05-01), Slaton
patent: 5511041 (1996-04-01), Michalski
patent: 6771560 (2004-08-01), Lyon et al.

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