Radar level gauge with variable transmission power

Details Radar level gauge with variable transmission power Radar level gauge with variable transmission power

2008-04-29

2008-04-29

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

C073S29000R

Reexamination Certificate

active

07363812

ABSTRACT:
A pulsed radar level gauge, comprising a transmitter for generating and transmitting a signal in the form of a pulse train, means for receiving pulses reflected in said tank, and to form an analogue tank signal based on these reflections, an analogue to digital converter for sampling and digitizing said tank signal and forming a digital time domain reflectometry (TDR) signal, and means for varying the output power of said transmitter during the transmission of said pulse train, in order to adjust an amplitude of said analogue tank signal to match the dynamics of said A/D-converter.A gain function applied on the receiver side is thus replaced by varying the output power on the transmitter side. This allows the signal-to-noise ratio to be improved, as the noise will not be amplified together with the signal.

REFERENCES:
patent: 4302623 (1981-11-01), Canfield
patent: 5611239 (1997-03-01), Klinshteyn
patent: 5734346 (1998-03-01), Richardson et al.
patent: 5898401 (1999-04-01), Walls
patent: 6211815 (2001-04-01), Richey et al.
patent: 2002/0158791 (2002-10-01), Meier
patent: 2004/0004567 (2004-01-01), Kroeger et al.

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