An On-Line Estimation Method for Measurement Uncertainty of Self-confirmed Atmospheric Data System
A technology of atmospheric data and system measurement, applied in the direction of electrical digital data processing, special data processing applications, calculations, etc., to achieve high real-time performance, rich uncertainty information, and small calculation burden
Active Publication Date: 2019-05-07
BEIJING AUTOMATION CONTROL EQUIP INST
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There are still a lot of studies on uncertainty estimation using new theories and new methods, which can make up for the shortcomings of traditional statistical theory to a certain extent, but cannot completely solve the uncertainty of atmospheric parameter measurement values of the self-confirming atmospheric sensing system in the present invention. The online estimation problem of
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[0040] The online estimation method of the measurement uncertainty of the self-confirmed air data system of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0041] Such as figure 1 Shown, a kind of online estimation method of the measurement uncertainty of the air data system of self-confirmation of the present invention comprises the following steps:
[0042] Step 1. According to the structural composition of the self-confirming atmospheric data sensing system, the number N of pressure measurement unit channels in the self-confirming atmospheric data sensing system is obtained; The working status (normal or fault) and fault type (transient fault or permanent fault) of one pressure measurement unit channel;
[0043] Step 2. For each pressure measurement unit channel, use fuzzy theory to construct a fuzzy variable to express the uncertainty of the pressure measurement value of each pressure measurem...
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The invention belongs to the technical field of estimation of uncertainty of measurement and relate to an online estimating method of measuring uncertainty of measurement for a self-validating air data system. The method comprises the following steps of: firstly, defining the quantity of pressure measuring units and sates thereof in the system based on the working state and structure of the self-validating air data sensing system; secondly, constructing a fuzzy variable corresponding to a measured value by means of a fuzzy theory for each of the pressure measuring units to represent the uncertainty of measurement of the pressure measuring value; and finally, performing compositional operation on the fuzzy variables of measured value accuracies of all the pressure measuring units in the system based on a logical operation principle of the fuzzy variables to acquire the uncertainty of measurement of various air parameters. The method provided by the invention not only can give more confidence levels and confidence intervals thereof and enrich the information of uncertainty of measurement, but also can reduce the calculating burden in the calculating process as relatively simple fuzzy logical operation is just involved, so that online real-time implementation of estimation of uncertainty of measurement is facilitated.
Description
technical field [0001] The invention belongs to the technical field of measurement uncertainty estimation, and relates to an online estimation method of measurement uncertainty of a self-confirming air data system. Background technique [0002] Measurement uncertainty is the degree of uncertainty of the measurement results, and it is also a quantitative expression of the quality of the measured values. The description of the uncertainty of each sensor test result is more complete. In the self-confirming atmospheric data sensing system, in addition to the measured values of atmospheric parameters such as pressure altitude and Mach number, the uncertainty of the measured values of the above atmospheric parameters should also be output online, and the accuracy range of the measured atmospheric parameters should be dynamically indicated. At present, the most common method for estimating the measurement uncertainty of instruments and meters is the "Guidelines for the Expressi...
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IPC IPC(8): G06F17/50
CPCG16Z99/00
Inventor 申争光苑景春
Owner BEIJING AUTOMATION CONTROL EQUIP INST