Method and an arrangement for distance measurement using the pul

Details Method and an arrangement for distance measurement using the pul Method and an arrangement for distance measurement using the pul

1993-05-28

1994-06-21

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

367908, 367 99, G01S 1308, G01F 2300

Patent

active

053233611

ABSTRACT:
For the measurement of distance using the pulse transit time principle the received signal produced after each transmission of a pulse is stored as an echo profile and the effective echo is determined from the stored echo profile. In order to suppress recurrent interfering signals a stationary threshold profile adapted to the measurement environment is formed and employed for each evaluation of a stored echo profile. In order to take into account fluctuations in the properties of the received echo profile rapidly without necessitating a modification in the stationary threshold profile for this, from a stored echo profile a floating threshold profile is generated in the form of a monotonously descending curve. From the mutually corresponding values of the floating threshold profile and of the stationary threshold profile the respectively larger value is utilized for the formation of a resulting threshold profile, which is employed for each evaluation of stored echo profiles.

REFERENCES:
patent: 4000650 (1977-01-01), Snyder
patent: 4245332 (1981-01-01), Schaefer
patent: 4596144 (1986-06-01), Panton et al.
patent: 4890266 (1989-12-01), Woodward
patent: 4992998 (1991-02-01), Woodward

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