Positioning apparatus comprising an inertial sensor and inertial sensor temperature compensation method
First Claim
1. An apparatus, comprising:
- an inertial sensor configured to output a current angular rate and associated with at least one inertial sensor behavior parameter dependent on inertial sensor temperature;
a temperature sensor configured to output an indication of a time derivative of a temperature of the inertial sensor; and
position-estimation circuitry configured to recursively compute an estimated current motion angle of a vehicle and at least one estimated inertial sensor behavior parameter as function of;
an indication of a measured current motion angle;
a previously estimated motion angle;
the current angular rate; and
the indication of the time derivative of the temperature output by the temperature sensor, wherein the at least one inertial sensor behavior parameter includes an inertial sensor sensitivity and an inertial sensor zero-rate level and the position-estimation circuitry is configured to generate position information based on Global Navigation Satellite System (GNSS) signals and dead-reckoning positioning system signals.
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Accused Products
Abstract
A positioning apparatus includes: a reference device configured to provide a measured current motion angle of a vehicle; an inertial sensor configured to provide a current input angular rate of the vehicle and associated with at least one inertial sensor behavior parameter dependent on inertial sensor temperature; a temperature sensor configured to provide an input temperature variation of the inertial sensor on a time interval; and a digital estimator configured to recursively computing an estimated current motion angle of the vehicle and at least one previously estimated inertial sensor behavior parameter as function of: the measured current motion angle, a previously estimated motion angle, the current input angular rate, and the input temperature variation.
13 Citations
19 Claims
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1. An apparatus, comprising:
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an inertial sensor configured to output a current angular rate and associated with at least one inertial sensor behavior parameter dependent on inertial sensor temperature; a temperature sensor configured to output an indication of a time derivative of a temperature of the inertial sensor; and position-estimation circuitry configured to recursively compute an estimated current motion angle of a vehicle and at least one estimated inertial sensor behavior parameter as function of; an indication of a measured current motion angle; a previously estimated motion angle; the current angular rate; and the indication of the time derivative of the temperature output by the temperature sensor, wherein the at least one inertial sensor behavior parameter includes an inertial sensor sensitivity and an inertial sensor zero-rate level and the position-estimation circuitry is configured to generate position information based on Global Navigation Satellite System (GNSS) signals and dead-reckoning positioning system signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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sensing, using an inertial sensor having at least one inertial sensor behavior parameter dependent on inertial sensor temperature, a current angular rate; receiving a time derivative of a temperature of the inertial sensor output by a temperature sensor; and recursively computing, using one or more processing devices, an estimated current motion angle of a vehicle and at least one estimated inertial sensor behavior parameter as function of; an indication of a measured current motion angle; a previously estimated motion angle; the current angular rate; and the time derivative of the temperature output by the temperature sensor, wherein the at least one inertial sensor behavior parameter includes an inertial sensor sensitivity and an inertial sensor zero-rate level and the method includes generating position information based on GNSS signals and dead-reckoning positioning system signals. - View Dependent Claims (17, 18, 19)
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Specification