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Time-domain temperature filtering method for accelerometer

A technology of acceleration and observation data, applied in speed/acceleration/shock measurement, testing/calibration of speed/acceleration/shock measurement equipment, measurement devices, etc., can solve the problem that the temperature filter of the accelerometer is not very suitable, and achieve the removal of temperature drift effect

Inactive Publication Date: 2019-06-14
BENGBU COLLEGE
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Problems solved by technology

[0012] These methods are not very suitable for the temperature filtering of the accelerometer. The frequency change measured by the accelerometer is generally above 1Hz, and the temperature change is generally based on a cycle of 24 hours, and the corresponding frequency is about 0.00001Hz.

Method used

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Embodiment

[0024] Assuming that the sampling frequency of the accelerometer is 100Hz, that is, sampling 100 data within 1s, when the work is just started, the first 100 sampling values ​​are directly saved, respectively S 1 , S 2 ... S 100 , and find its average value.

[0025] For the sampling data in the 2s, subtract the average value of all the data in the 1s, and then save the data to get S 101 , S 102 ... S 200 .

[0026] For the sampling data after the 3s, starting from the 201st sampling value, it needs to subtract the 100 saved values ​​before this point respectively, and use the result as the saved value of this point. For example, for the 202nd sampling value, first find S 102 -S 201 Save the average value of the value, and then subtract the average value from the 202nd sample value, and the result is the 202nd saved value S 202 , and so on.

[0027] This method can remove the temperature drift of the accelerometer by performing a time-domain filter on the result of th...

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Abstract

The invention provides a time-domain temperature filtering method for an accelerometer, in which time-domain filtering is carried out on results of the accelerometer to remove temperature drifts of the accelerometer. The method is characterized in that the mean value of all saved data in the previous second is subtracted from current observation data, and the result is saved as a current recordedvalue; at the beginning of operation of the accelerometer, observation data in the first second serve as saved data; and the mean value of all the data in the first second is subtracted from observation data in the second second to obtain saved data. The filtering method provided by the invention has the advantages that the time-domain filtering is carried out on the results of the accelerometer to remove the temperature drifts of the accelerometer, so that high practicality is achieved.

Description

technical field [0001] The invention relates to the technical field of time domain filtering methods, in particular to an accelerometer domain temperature filtering method. Background technique [0002] There are many types of time-domain filtering methods, mainly the following five. [0003] 1. Average value filtering is generally divided into the following three types. [0004] 1) Arithmetic average filtering method: take N sampling values ​​continuously for arithmetic average operation. When the N value is larger, the signal smoothness is higher, but the sensitivity is lower; when the N value is smaller, the signal smoothness is lower, but the sensitivity is higher. It is suitable for filtering signals that generally have random interference. This kind of signal is characterized by an average value, and the signal fluctuates around a certain value range. [0005] 2) Median average filter method (also known as anti-pulse interference average filter method): equivalent t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P21/00
Inventor 王姝敏李阔刘国永李瑜庆赵义虎
Owner BENGBU COLLEGE
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