Title:
NORMALIZATION OF INDUCTIVE VEHICLE DETECTOR OUTPUTS
Document Type and Number:
WIPO Patent Application WO2003077531
Kind Code:
A3
Abstract:
Methods and apparatus for such that a measurement made for a given vehicle by a given detector is substantially repeatable using either the same detector from one time to another, or using a different detector. In one embodiment, normalization coefficients are determined by measuring one or more common probe vehicles (102, 104) and standardizing the outputs of the detector(s) (110) to give a consistent output. In another embodiment, normalization coefficients are determined by measuring one or more operating or circuit parameters of the detector circuit(s), and compensating the outputs of the detector(s) for variations in these measured parameters. In one embodiment, a differential amplifier (208) multiples the output of the detector (204) by the first order normalization coefficient (206). In another embodiment, a digital signal processor (302) applies the normalization coefficients to the digitized output of the detector (204).
Inventors:
HILLIARD STEVEN R (US)
YEREM GEOFFREY C (US)
YEREM GEOFFREY C (US)
Application Number:
PCT/US2003/007254
Publication Date:
November 20, 2003
Filing Date:
March 07, 2003
Export Citation:
Assignee:
INDUCTIVE SIGNATURE TECH INC (US)
HILLIARD STEVEN R (US)
YEREM GEOFFREY C (US)
HILLIARD STEVEN R (US)
YEREM GEOFFREY C (US)
International Classes:
G08G1/042; (IPC1-7): G01C19/00; G01C25/00; G01D18/00; G01F25/00; G06F19/00; G08G1/01
Foreign References:
| US6345228B1 | 2002-02-05 | |||
| US5278555A | 1994-01-11 |
Download PDF:
Previous Patent: QUICK-RELEASE SENSOR ASSEMBLY AND METHOD
Next Patent: RECORDING-LOCATION DETERMINATION USING DIFFERENT TYPES OF SIGNAL SOURCES
Next Patent: RECORDING-LOCATION DETERMINATION USING DIFFERENT TYPES OF SIGNAL SOURCES