PATENT CLAIM ANALYSIS

Application Number: 15866125
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2018-05
Patent Classification: ["701", "500000"]

Abstract:
A method of mitigating filter inconsistency of a heading estimate in an inertial navigation system is provided. The method includes inputting inertial measurements from at least one low-performance inertial measurement unit (IMU) in the inertial navigation system; inputting an initial-heading from at least one heading-information source; inputting an initial-heading uncertainty level associated with an error in the inputted initial-heading; initializing an initial-heading estimate with the inputted initial-heading; initializing an initial-heading uncertainty estimate with the inputted initial-heading uncertainty level; initializing an accumulated heading-change estimate to zero at a startup of the at least one low-performance IMU; and initializing an accumulated heading-change uncertainty estimate with an initial accumulated heading-change uncertainty level that is a value less than the inputted initial-heading uncertainty level; and periodically updating the accumulated heading-change estimate with the inertial measurements input from the at least one low-performance IMU.

Claim (Index 1):
A method of mitigating filter inconsistency in a heading estimate from a navigation filter designed to estimate a joint probability density function (PDF) of a position, a velocity, an attitude, and a heading of a strapdown inertial navigation system that uses at least one low-performance inertial measurement unit (IMU), the method comprising:\n estimating an initial-heading error using a first filter error state; and estimating an accumulated heading-change error using a second filter error state; wherein the first error state is an independent and distinct error state from the second filter error state.

Metadata:
- Claim Count in Document: 9.0
- Percentile: 86.0
- Lexical Diversity: 2.63158
- Patent Class: 701.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['15174207', '12215617', '15461028', '11102523', '14593266']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.4468574997384149
- 35 USC 102 Novelty (BERT): 0.5644192538070865
- Combined Prediction Score: 0.458613675145282
- Mean Citation Score: 265.387674
- Max Citation Score: 461.54428
- Similarity Product: 403.690805613575

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test