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Step-counting method based on mobile phone acceleration and gyroscope sensor

A technology of acceleration and gyroscope, applied in the field of step counting based on mobile phone acceleration and gyroscope sensors, to achieve the effect of improving the robustness of the algorithm

Inactive Publication Date: 2019-01-18
NANJING UNIV
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Problems solved by technology

However, since the resultant acceleration curve generated by lifting in situ, shaking up and down, and shaking the mobile phone left and right is very similar to the resultant acceleration curve generated by stepping, it is impossible to judge whether the user is walking or operating the mobile phone on the spot only by relying on the resultant acceleration magnitude curve

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  • Step-counting method based on mobile phone acceleration and gyroscope sensor
  • Step-counting method based on mobile phone acceleration and gyroscope sensor
  • Step-counting method based on mobile phone acceleration and gyroscope sensor

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] The invention discloses a step counting method based on mobile phone acceleration and gyroscope sensor, comprising the following steps:

[0035] Step 1, collect the acceleration and angular velocity data of the user's mobile phone at a frequency of 100 Hz, calculate the combined acceleration and combined angular velocity amplitude, and store the combined angular velocity amplitude into an array al with a length of 30;

[0036] Step 2, carry out median filtering on the resultant acceleration amplitude, and the window length is 3;

[0037] Step 3, make the combined acceleration amplitude greater than 10.91m / s 2 When the time point is recorded as t1, less than 8.94m / s 2 The time point is recorded as t2 (t1, t2 are both in ms), if t2-t1 is between 25 and 300, it is considered to be a suspected step, and then go to step 4, otherwise go to step 1;

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Abstract

The invention discloses a step-counting method based on mobile phone acceleration and a gyroscope sensor. The step-counting method comprises the following steps: step one, colleting acceleration and angular speed data of a user mobile phone, computing resultant acceleration and resultant angular speed amplitude, and saving resultant acceleration amplitude in an array al; step two, performing median filter on the resultant acceleration amplitude; step three, recording a time point when the resultant acceleration amplitude is greater than an upper threshold as t1, and recording time point when the resultant acceleration amplitude is less than lower threshold as t2, judging whether a suspected moving resultant acceleration curve is existent according to t1 and t2, if the suspected moving resultant acceleration curve is existent, shifting to step four, or shifting to step one; step four, comparing values in the array al with the preset resultant angular speed threshold one by one; and stepfive, judging that the user takes a step at this moment if all values in the array al do not exceed the resultant angular speed threshold; or judging that the user operates the mobile phone on site at this moment, and not counting the step.

Description

technical field [0001] The invention relates to a step counting method based on mobile phone acceleration and gyroscope sensors. Background technique [0002] Using mobile phone GPS walking navigation, when passing through high-rise buildings, big trees, underpasses and other places, due to the blocking of GPS signals, there will be large positioning deviations. At this time, inertial navigation methods can be used to assist in improving positioning accuracy. That is, the latitude and longitude information at that time is recorded at the moment before the positioning accuracy becomes low, and the distance and direction changes at each subsequent step are converted into changes in latitude and longitude, thereby obtaining high-precision positioning information. The main content of pedestrian inertial navigation includes: step counting algorithm, step size estimation and heading algorithm. The invention mainly aims at the shortcomings of the existing step counting algorithm, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C22/00G01C21/12
CPCG01C21/12G01C22/006
Inventor 季晓勇金伟旗陈磊谷宇
Owner NANJING UNIV
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