Doubly filtered navigation method
US-2022146281-A1 · May 12, 2022 · US
Method and unit for calculating inertial navigation data
US12553720B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12553720-B2 |
| Application number | US-202218278574-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 28, 2022 |
| Priority date | Mar 2, 2021 |
| Publication date | Feb 17, 2026 |
| Grant date | Feb 17, 2026 |
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Abstract
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This inertial navigation unit comprises a navigation data acquisition unit (1) and a first navigation stage (2) capable of calculating hybrid navigation values by combining navigation data. It further includes a second navigation stage (3) capable of calculating certified navigation values independently of the hybrid navigation values, said certified navigation values being certified with a geolocation error limit.
First claim
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The invention claimed is: 1 . A method for calculating inertial navigation data, wherein: navigation data are acquired; and hybrid navigation values are calculated based on these navigation data; and certified navigation values are calculated, independently of the hybrid navigation values, said certified navigation values being certified with a geolocation error limit, wherein, for the certified navigation values, a first permissible geolocation error limit is calculated corresponding to a geolocation with a predetermined probability of error, and wherein, for the hybrid navigation values, a second permissible geolocation error limit is calculated based on the first geolocation error limit and on a difference between the hybrid navigation values and the certified navigation values. 2 . The method according to claim 1 , wherein a validity status (V) of the hybrid navigation values is calculated by comparison with respective threshold values. 3 . The method according to claim 1 , wherein, during the calculation of the certified navigation values, a Kalman filter is used for calculating error covariances based on the navigation data. 4 . The method according to claim 3 , wherein the Kalman filter is an invariant Kalman filter. 5 . The method according to claim 1 , wherein a zero velocity updating is performed on an inertial navigation stage capable of calculating the certified navigation values. 6 . The method according to claim 1 , wherein the hybrid navigation values are calculated based on inertial data from measuring sensors in three spatial directions, and on additional data, particularly from movement models. 7 . An inertial navigation unit, comprising: a navigation data acquisition unit; a first navigation stage capable of calculating hybrid navigation values by combining navigation data; and a second navigation stage capable of calculating certified navigation values, independently of the hybrid navigation values, said certified navigation values being certified with a geolocation error limit, wherein, for the certified navigation values, a first permissible geolocation error limit is calculated corresponding to a geolocation with a predetermined probability of error, and wherein, for the hybrid navigation values, a second permissible geolocation error limit is calculated based on the first geolocation error limit and on a difference between the hybrid navigation values and the certified navigation values.
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whereby the further system is an inertial position system, e.g. loosely-coupled · CPC title
Integrity monitoring, fault detection or fault isolation of space segment · CPC title
combined with non-inertial navigation instruments · CPC title
- G01C21/16Primary
by integrating acceleration or speed, i.e. inertial navigation · CPC title
- G01C23/00Primary
Combined instruments indicating more than one navigational value, e.g. for aircraft; Combined measuring devices for measuring two or more variables of movement, e.g. distance, speed or acceleration · CPC title
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- What does patent US12553720B2 cover?
- This inertial navigation unit comprises a navigation data acquisition unit (1) and a first navigation stage (2) capable of calculating hybrid navigation values by combining navigation data. It further includes a second navigation stage (3) capable of calculating certified navigation values independently of the hybrid navigation values, said certified navigation values being certified with a geo…
- Who is the assignee on this patent?
- Safran Electronics & Defense
- What technology area does this patent fall under?
- Primary CPC classification G01C21/16. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Feb 17 2026 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).