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Accelerometer and method for error compensation

An error compensation, accelerometer technology, applied in the improvement field of 3-axis accelerometer, can solve the problems of expensive manufacturing, not solid state reliability, complicated mechanical details, etc.

Active Publication Date: 2011-04-13
L 3 COMM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These devices are rather complicated in their mechanical details and therefore rather expensive to manufacture, and since these devices include fluids, they are not really solid state and therefore have problems with reliability

Method used

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  • Accelerometer and method for error compensation
  • Accelerometer and method for error compensation
  • Accelerometer and method for error compensation

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Embodiment Construction

[0035] The invention is described in one or more embodiments in the following specification with reference to the accompanying drawings, wherein like reference numbers indicate the same or similar elements. While the invention has been described in terms of the best mode for carrying out the invention, those skilled in the art will recognize that the invention is intended to cover the scope as may be included in the appended claims and their equivalents supported by the following disclosure and drawings. Alternatives, modifications and equivalents within the spirit and scope of the invention.

[0036] Referring now to the drawings, and more particularly to figure 1, shows an aircraft 10 generally comprising a nose section 12 , a cockpit 14 , a fuselage 16 , an aft section 18 , wings 20 and an engine 22 . Fuselage 16 includes a fuselage frame having a number of components. Flight data collection unit 24 may be positioned in nose 12 or elsewhere to collect, for example, airsp...

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Abstract

An accelerometer has an acceleration transducer producing uncorrected analog acceleration signals representing vertical, lateral, and longitudinal components of acceleration. An error correction system is connected to the acceleration transducer for receiving the uncorrected analog acceleration signals. The error correction system includes a system controller for generating a plurality of correction coefficients, an analog to digital converter which converts the uncorrected analog acceleration signals to uncorrected digital acceleration signals, a filter for filtering the uncorrected digital acceleration signals, an error compensation circuit receiving the correction coefficients to compensate the uncorrected digital acceleration signals, and a digital to analog converter which converts the corrected digital acceleration signals to corrected analog acceleration signals. The error compensation circuit corrects for bias offset, cross-axis alignment errors, scaling errors, and thermal offset. The system controller arranges a plurality of calibration measurements into a matrix and inverts the matrix to calculate the correction coefficients.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Patent Application 12 / 117,538, filed May 8, 2008, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates generally to accelerometers and, more particularly, to improved methods and apparatus for 3-axis accelerometers. Background technique [0004] Many aircraft require on-board flight recorders, such as flight data recorders (FDR), cockpit voice recorders (CVR), and video recorders. Well known as black boxes for analysis of air crashes or accidents, these units are also used to study air safety issues, material aging, unsafe flight processes and jet engine performance. [0005] In many airline accidents or other aircraft accidents, the crash survivable memory unit (CSMU) of these flight recorders is the only system that survives in usable form. Flight data recorders use the CSMU to record specific aircraft perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P21/02G01P15/18
CPCG01P21/00G01P15/18G01P1/006
Inventor T·罗森巴威尔M·E·韦德
Owner L 3 COMM CORP
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