Apparatus and method for detecting steps in personal navigation system
First Claim
1. An apparatus for step detection in a personal navigation system, the apparatus comprising:
- an acceleration sensor for detecting acceleration in a movement direction and a gravity direction relative to a user and then outputting acceleration signals according to the detection result; and
a moving distance measurement device for calculating sliding window summing data for the acceleration signals in the movement direction and the gravity direction to calculate a sum of the sliding window summing data, and then detecting steps of the user by using differential sliding window summing data.
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Abstract
An apparatus and a method for step detection in a personal navigation system is disclosed. In the apparatus acceleration signals are obtained from an acceleration sensor in a movement direction and a gravity direction relative to a user. Sliding window summing data for the acceleration signals output from the acceleration sensor in the movement direction and the gravity direction are calculated so as to obtain a sum of the sliding window summing data. Then, a zero crossing point is detected based on differential sliding window summing data. A difference of a detection time between a present zero crossing point and a previous zero crossing point is compared with a threshold value, thereby detecting steps of the user based on the distinct signal pattern for walk. The step detection apparatus distinguishes zero crossing detection caused by chattering (e.g., vibration) of the human body from zero crossing detection caused by the step of the user, so the step detection apparatus more precisely detects the step of the user. Accordingly, it is possible to precisely detect the step of the user in a hand-held type personal navigation system, such as a portable phone or a PDA, including a micro sensor module.
24 Citations
20 Claims
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1. An apparatus for step detection in a personal navigation system, the apparatus comprising:
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an acceleration sensor for detecting acceleration in a movement direction and a gravity direction relative to a user and then outputting acceleration signals according to the detection result; and
a moving distance measurement device for calculating sliding window summing data for the acceleration signals in the movement direction and the gravity direction to calculate a sum of the sliding window summing data, and then detecting steps of the user by using differential sliding window summing data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for step detection in a personal navigation system, the method comprising:
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obtaining acceleration signals from an acceleration sensor in a movement direction and a gravity direction relative to a user;
calculating sliding window summing data for the acceleration signals of the acceleration sensor in the movement direction and the gravity direction;
calculating a sum of the sliding window summing data, and differential sliding window summing data; and
detecting steps of the user based on the differential sliding window summing data. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification