Method and apparatus for fixed target echo suppression in distan

Details Method and apparatus for fixed target echo suppression in distan Method and apparatus for fixed target echo suppression in distan

1996-10-24

1998-10-13

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367908, G01S 1500, G01S 752

Patent

active

058222758

ABSTRACT:
In distance measurement on the principle of pulse transit time in each measurement cycle in a transmitting phase a transmission pulse having a given transmission frequency is emitted and in a subsequent receiving phase the envelope of the received signals is formed to determine the transit time of the useful echo pulse. For suppressing the fixed target echoes a broken line of several segments surrounding the envelope of the fixed target echo is formed for each fixed target echo. For each segment, information as to the amplitude of the end point of the segment, as to the changing direction and slope of the segment, as well as for the first segment information as to the point in time of the start of the first segment in the measurement cycle are stored. In the course of the measurement cycle as of the point in time of the start of the first segment, for each segment, counting pulses having a repetition frequency dictated by the slope information are counted in a counting direction dictated by the direction information up to achieving a count dictated by the amplitude information. In the course of the measurement cycle each current count is used to control fixed target echo suppression.

REFERENCES:
patent: 4418340 (1983-11-01), Maeshiba
patent: 4890266 (1989-12-01), Woodward
patent: 5320105 (1994-06-01), Bonnefous et al.
patent: 5323361 (1994-06-01), Elle et al.
patent: 5587969 (1996-12-01), Kroemer et al.
patent: 5631875 (1997-05-01), Romes et al.
Schrank, W. (Sep. 1988), Fuellstandsmessung mit intelligenten Ultraschallmessgeraeten, Messen Pruefen Automatisieren, pp. 443-447.

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