ATTITUDE ESTIMATION FOR PEDESTRIAN NAVIGATION USING LOW COST MEMS ACCELEROMETER IN MOBILE APPLICATIONS, AND PROCESSING METHODS, APPARATUS AND SYSTEMS
First Claim
1. A user-heading determining system for pedestrian use, the system comprising:
- a multiple-axis accelerometer having acceleration sensors;
a device-heading sensor circuit physically situated in a fixed relationship to the accelerometer;
an electronic circuit operable to generate signals representing components of acceleration sensed by said accelerometer sensors, and to electronically process at least some part of the signals to produce an estimation of attitude of a user motion with respect to the accelerometer, and further to combine the attitude estimation with a device heading estimation responsive to said device-heading sensor circuit, to produce a user heading estimation; and
an electronic display responsive to said electronic circuit to display information at least in part based on said user heading estimation.
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Accused Products
Abstract
A user-heading determining system (10) for pedestrian use includes a multiple-axis accelerometer (110) having acceleration sensors; a device-heading sensor circuit (115) physically situated in a fixed relationship to the accelerometer (110); an electronic circuit (100) operable to generate signals representing components of acceleration sensed by the accelerometer (110) sensors, and to electronically process at least some part of the signals to produce an estimation of attitude of a user motion with respect to the accelerometer, and further to combine the attitude estimation (750, α) with a device heading estimation (770, ψ) responsive to the device-heading sensor circuit, to produce a user heading estimation (780); and an electronic display (190) responsive to the electronic circuit (100) to display information at least in part based on the user heading estimation. Other systems, circuits and processes are also disclosed.
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Citations
46 Claims
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1. A user-heading determining system for pedestrian use, the system comprising:
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a multiple-axis accelerometer having acceleration sensors; a device-heading sensor circuit physically situated in a fixed relationship to the accelerometer; an electronic circuit operable to generate signals representing components of acceleration sensed by said accelerometer sensors, and to electronically process at least some part of the signals to produce an estimation of attitude of a user motion with respect to the accelerometer, and further to combine the attitude estimation with a device heading estimation responsive to said device-heading sensor circuit, to produce a user heading estimation; and an electronic display responsive to said electronic circuit to display information at least in part based on said user heading estimation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An electronic circuit for use with a personal accelerometer, the electronic circuit comprising:
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input lines for respective acceleration signals; a nonvolatile memory having stored representations of instructions at least to generate a signals representing a vector average of acceleration and a varying magnitude of acceleration, and to electronically correlate a sliding window of the respective acceleration signals with the magnitude of acceleration; and a processor circuit coupled with said input lines and programmably operable in response to the instructions in said nonvolatile memory for at least addition and multiplication and conditional operations, thereby to effectuate the instructions and to electronically process at least some part of the signals to produce an estimation of attitude angle. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A process responsive to an accelerometer and a device-heading sensor unit, the process comprising:
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generating signals representing components of acceleration acquired from said accelerometer; electronically processing at least some part of the signals to produce walking step signals and an estimation of attitude of a user motion with respect to the accelerometer, and further to combine the attitude estimation with a device heading estimation responsive to said device-heading sensor unit, to produce a user heading estimation; and portably displaying a visual path of walking jointly based on said walking step signals, attitude estimation and device heading estimation. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification