System and method for employing an aided-alignment mode to align an inertial reference system
First Claim
1. A method for aligning an inertial reference system that is coupled to a moveable body, the method comprising:
- (a) obtaining from an unaided source unaided navigation state information, wherein the unaided source generates the unaided navigation state information using navigation information provided by an inertial reference;
(b) obtaining from an aiding source aiding state information, wherein the aiding source generates the aiding state information using navigation information provided by at least one external reference;
(c) determining an unaided navigation solution using the unaided navigation state information;
(d) determining an aided navigation solution using a combination of the unaided and aiding state information;
(e) providing the unaided navigation solution for navigating the movable body; and
(f) replacing the unaided navigation solution with the aided navigation solution when the aided navigation solution provides a better navigation solution for navigating the movable body.
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Abstract
A system and method for aligning an inertial reference system, which is coupled to a moveable body, is provided. The method includes obtaining unaided navigation state information from an unaided source, and obtaining aiding state information from an aiding source. The unaided navigation state information is generated by the unaided source using navigation information provided by an inertial reference, and the aiding state information is generated by the aiding source using navigation information provided by at least one external reference. The method also includes determining an unaided navigation solution using the unaided navigation state information, and determining an aided navigation solution using a combination of the unaided and aiding state information. As a default, the method provides the unaided navigation solution for navigating the movable body. When the aided navigation solution provides a better solution for navigating the movable body, the unaided navigation solution is replaced with the aided navigation solution.
25 Citations
41 Claims
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1. A method for aligning an inertial reference system that is coupled to a moveable body, the method comprising:
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(a) obtaining from an unaided source unaided navigation state information, wherein the unaided source generates the unaided navigation state information using navigation information provided by an inertial reference;
(b) obtaining from an aiding source aiding state information, wherein the aiding source generates the aiding state information using navigation information provided by at least one external reference;
(c) determining an unaided navigation solution using the unaided navigation state information;
(d) determining an aided navigation solution using a combination of the unaided and aiding state information;
(e) providing the unaided navigation solution for navigating the movable body; and
(f) replacing the unaided navigation solution with the aided navigation solution when the aided navigation solution provides a better navigation solution for navigating the movable body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system for aligning an inertial reference system that is coupled to a moveable body, the system comprising:
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an unaided source that is operable to generate an unaided navigation state information using navigation information provided by an inertial reference;
an aiding source that is operable to generate an aided navigation state information using navigation information provided by at least one external reference;
a navigation device that is operable to (i) determine an unaided navigation solution using the unaided navigation state information, and (ii) determine an aided navigation solution using a combination of the unaided and aiding state information;
an integrity-check device that is operable to (i) provide the unaided navigation solution for navigating the movable body, and (ii) replace the unaided navigation solution with the aided navigation solution when the aided navigation solution provides a better navigation solution for navigating the movable body. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification