发明申请
US20120262340A1 STEP FILTER FOR ESTIMATING DISTANCE IN A TIME-OF-FLIGHT RANGING SYSTEM
有权
用于在飞行时间范围内估计距离的步骤滤波器
- 专利标题： STEP FILTER FOR ESTIMATING DISTANCE IN A TIME-OF-FLIGHT RANGING SYSTEM
- 专利标题（中）： 用于在飞行时间范围内估计距离的步骤滤波器
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申请号： US13443998申请日： 2012-04-11
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公开(公告)号： US20120262340A1公开(公告)日： 2012-10-18
- 发明人: Hasib Hassan , Dale R. Benton , John Lu , Brian A. Gorman
- 申请人： Hasib Hassan , Dale R. Benton , John Lu , Brian A. Gorman
- 申请人地址： US MI Holly
- 专利权人： MAGNA ELECTRONICS INC.
- 当前专利权人： MAGNA ELECTRONICS INC.
- 当前专利权人地址： US MI Holly
- 主分类号： G01S3/02
- IPC分类号： G01S3/02
摘要：
A ranging system includes a time of flight subsystem including circuitry incorporated in a mobile node and a base station for generating a TOF signal between the mobile node and the base station, measuring the time taken for transmission of the TOF signal, and generating a TOF distance signal based on the measured time. An accelerometer, mounted in the mobile node, generates an accelerometer signal. A distance filter generates the distance estimate. The filter is configured to (i) initialize the value of a distance estimate signal based on the TOF distance signal, (ii) detect a human step based on variances in the accelerometer signal, and (iii) change the value of the distance estimate signal by a predetermined quantum only upon detection of the human step, the change being positive or negative depending on a direction of the TOF distance signal relative to the distance estimate signal.
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