Navigation system applications of sigma-point Kalman filters for nonlinear estimation and sensor fusion
First Claim
1. A method performed in an integrated navigation system to estimate the navigational state of an object, the navigational state characterized by random variables of a kinematics-based system state space model, the system state space model specifying a time evolution of the system and its relationship to sensor observations, comprising:
- acquiring observation data produced by measurement sensors that provide noisy information about the navigational state, the measurement sensors including an inertial measurement unit (IMU) and a global positioning system (GPS) operating to provide information for estimating a set of navigational state components that include position, velocity, attitude, and angular velocity; and
providing a probabilistic inference system to combine the observation data with prediction values of the system state space model to estimate the navigational state, the probabilistic inference system implemented to include a realization of a Gaussian approximate random variable propagation technique performing deterministic sampling without analytic derivative calculations.
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Abstract
A method of estimating the navigational state of a system entails acquiring observation data produced by noisy measurement sensors and providing a probabilistic inference system to combine the observation data with prediction values of the system state space model to estimate the navigational state of the system. The probabilistic inference system is implemented to include a realization of a Gaussian approximate random variable propagation technique performing deterministic sampling without analytic derivative calculations. This technique achieves for the navigational state of the system an estimation accuracy that is greater than that achievable with an extended Kalman filter-based probabilistic inference system.
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Citations
31 Claims
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1. A method performed in an integrated navigation system to estimate the navigational state of an object, the navigational state characterized by random variables of a kinematics-based system state space model, the system state space model specifying a time evolution of the system and its relationship to sensor observations, comprising:
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acquiring observation data produced by measurement sensors that provide noisy information about the navigational state, the measurement sensors including an inertial measurement unit (IMU) and a global positioning system (GPS) operating to provide information for estimating a set of navigational state components that include position, velocity, attitude, and angular velocity; and providing a probabilistic inference system to combine the observation data with prediction values of the system state space model to estimate the navigational state, the probabilistic inference system implemented to include a realization of a Gaussian approximate random variable propagation technique performing deterministic sampling without analytic derivative calculations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An integrated navigation system for estimating the navigational state of an object, the navigational state characterized by random variables of a kinematics-based system state space model, the s stem state space model specifying a time evolution of the system and its relationship to sensor observations, comprising:
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measurement sensors producing observation data in the form of noisy information about the navigational state, the measurement sensors including an integrated measurement unit (IMU) and a global positioning system (GPS) operating to provide information for estimating a set of navigational state components that include position, velocity, attitude, and angular velocity; and a probabilistic inference system configured to combine the observation data with prediction values of the system state space model to estimate the navigational state, the probabilistic inference system implemented to include a realization of a Gaussian approximate random variable propagation technique performing deterministic sampling without analytic derivative calculations. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method performed in a global positioning system (GPS) to estimate the navigational state of an object, the navigational state characterized by random variables of a kinematics-based system state space model, the system state space model specifying a time evolution of the system and its relationship to sensor observations, comprising:
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acquiring observation data produced by measurement sensors that provide noisy information about the navigational state, the measurement sensors including a GPS operating to receive raw satellite signal transmissions and provide information for estimating a set of navigational state components including position and velocity; and providing a probabilistic inference system to combine the observation data with prediction values of the system state space model to estimate the navigational state, the probabilistic inference system implemented to include a realization of a Gaussian approximate random variable propagation technique performing deterministic sampling without analytic derivative calculations. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A method of estimating a state of a system, the state characterized by random variables of a system state space model, the system state space model specifying a time evolution of the system and its relationship to sensor observations, comprising:
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acquiring observation data produced by measurement sensors that provide noisy information about the state of the system at a time that lags a current time because of sensor latency, communication delay, or other processing delay; providing a probabilistic inference system to combine the observation data with prediction values of the system state space model to estimate the state of the system, the probabilistic inference system implemented to include a realization of a Gaussian approximate random variable propagation technique performing deterministic sampling without analytic derivative calculations; maintaining a cross correlation between a state of the system at a current time and the state to which the latency lagged observation data correspond; and using the cross correlation to optimally combine latency lagged observation data with the prediction values of the system state space model. - View Dependent Claims (31)
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Specification