Enhanced inertial measurement unit/global positioning system mapping and navigation process
DC CAFC
First Claim
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1. An enhanced inertial measurement unit/global positioning system and map navigation process, comprising steps of:
- (a) receiving a measured position from an integrated inertial measurement unit/global positioning system device, wherein said integrated inertial measurement unit/global positioning system device comprises a micro IMU, a GPS receiver and means for blending measurements from said micro IMU and said GPS receiver;
(b) retrieving geospatial data from a geospatial map database based on said measured position from said integrated inertial measurement unit/global positioning system device by using a tile index file, wherein s aid tile index file stores geographic extent information of tiles which are geographically subdividing a coverage solely for a purpose of enhancing data management;
wherein a geographic extent of an access area is compared with said geographic extent of said tiles to derive a plurality of involved tiles for said access area;
(c) performing time-space filtering based on said measured position and said retrieved geospatial data from said geospatial map database to derive a displaying position for a user;
wherein said measured position and a previous position and a previous velocity are used to derive a true position for said user; and
(d) displaying a trajectory of said user on a graphic displaying unit, which tracks a motion of said user.
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Abstract
The present invention relates generally to a geospatial database access and query method, and more particularly to a map and Inertial Measurement Unit/Global Positioning System (IMU/GPS) navigation process. With the location information provided by an IMU/GPS integrated system, the geospatial database operations, such as database access and query, are sped up. With the map data from a geospatial database, the navigation performance and accuracy are enhanced. The present invention also supports real time mapping by using IMU/GPS integrated system as the positioning sensor.
56 Citations
10 Claims
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1. An enhanced inertial measurement unit/global positioning system and map navigation process, comprising steps of:
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(a) receiving a measured position from an integrated inertial measurement unit/global positioning system device, wherein said integrated inertial measurement unit/global positioning system device comprises a micro IMU, a GPS receiver and means for blending measurements from said micro IMU and said GPS receiver;
(b) retrieving geospatial data from a geospatial map database based on said measured position from said integrated inertial measurement unit/global positioning system device by using a tile index file, wherein s aid tile index file stores geographic extent information of tiles which are geographically subdividing a coverage solely for a purpose of enhancing data management;
wherein a geographic extent of an access area is compared with said geographic extent of said tiles to derive a plurality of involved tiles for said access area;
(c) performing time-space filtering based on said measured position and said retrieved geospatial data from said geospatial map database to derive a displaying position for a user;
wherein said measured position and a previous position and a previous velocity are used to derive a true position for said user; and
(d) displaying a trajectory of said user on a graphic displaying unit, which tracks a motion of said user. - View Dependent Claims (2, 3)
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4. An enhanced inertial measurement unit/global positioning system and map navigation system, comprising:
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an integrated IMU/GPS device for providing a position data for a user, wherein said Integrated IMU/GPS device comprises an IMU, a GPS receiver, and means for blending measurements from said IMU and said GPS receiver;
a remote geospatial database which is stored on a remote computer system, wherein said remote computer system is connected with a computing platform via a data link;
an operational interface for providing a command input method for a user;
an integrated menu for providing a collection of functional menus for said user;
a database query and access module for providing an IMU/GPS-based efficient geospatial database access and spatial query;
a mission specific database creation module for generating a local database stored in said computing platform from said remote geospatial database;
a database updating module for adding new features using a inertial measurement unit/global positioning system device as a basic device;
a feature attribute coding catalogue for encoding for said new features added to said geospatial database and for decoding for said GPS-based efficient geospatial database access and spatial query;
a communication interface, which provides a communication link between said remote geospatial database and said computing platform;
a data uploading module for transmitting said new features added to said database to said remote geospatial database via said communication interface; and
a data downloading module for transmitting said created mission specific database from said remote geospatial database to said computing platform. - View Dependent Claims (5)
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6. An enhanced inertial measurement unit/global positioning system and map navigation process, comprising the steps of:
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(a) receiving a position of a user from an inertial measurement unit/global positioning system device;
(b) converting a global coordinate to a local coordinate to match a coordinate system employed in a map database;
(c) retrieving geospatial data from a geospatial map database based on said measured position from said inertial measurement unit/global positioning system device by using a tile index file which stores geographic extent information of tiles;
wherein said tiles are geographically subdividing a coverage solely for a purpose of enhancing data management;
wherein a geographic extent of an access area is compared with said geographic extent of said tiles to derive a plurality of involved tiles for said access area;
(d) performing time-space filtering based on said measured position and said retrieved geospatial data from said geospatial map database to derive a displaying position for a user;
wherein said measured position and a previous position and a previous velocity are used to derive a true position for said user; and
(e) performing coordinate conversion from said local coordinate to a pixel coordinate and displaying said position of said user on a graphic displaying unit. - View Dependent Claims (7, 8)
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9. An enhanced inertial measurement unit/global positioning system and map navigation system, comprising:
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an integrated IMU/GPS device for providing a position data for a user, wherein said Integrated IMU/GPS device comprises an IMU, a GPS receiver, and a means for blending measurements from said IMU and said GPS receiver;
a geospatial database which is stored on a computing platform and provides a spatial information for a user;
an operational interface for providing a command input method for said user;
an integrated menu for providing a collection of functional menus for said user;
a database query and access module, which provides an IMU/GPS-based efficient geospatial database access and spatial query;
a database updating module for adding new features using a inertial measurement unit/global positioning system device as a basic device;
a feature attribute coding catalogue for encoding for new features added to said geospatial database and for decoding for said efficient database access and query;
a map viewer for displaying a map and a user mark on a screen, for displaying a trajectory of a motion of said user, and for zooming in and zooming out display of said geospatial data, wherein said map is generated from retrieved geospatial data in said database access and query module and displayed as background and said user mark is displayed on said screen to show a position of said user; and
a time-space filtering module for fully fusing an IMU/GPS position from said integrated inertial measurement unit/global positioning system device and said retrieved geospatial data in said database query and access module to derive an accurate position of said user. - View Dependent Claims (10)
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Specification
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Litigation Data
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Current AssigneeAmerican GNC Corporation
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Original AssigneeAmerican GNC Corporation
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InventorsLin, Ching-Fang
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Primary Examiner(s)LOUIS JACQUES, JACQUES H
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Application NumberUS10/359,851Publication NumberTime in Patent Office585 DaysField of Search701/213, 701/214, 701/215, 701/216, 701/217, 701/220, 701/221, 701/207, 701/208, 342/357.01, 342/357.02, 342/357.03, 342/357.06, 342/357.12, 342/357.13, 342/357.14, 342/357.17, 340/988, 340/990, 340/995.1, 340/995.14, 340/995.19, 340/995.22, 244/3.15, 244/3.2US Class Current701/213CPC Class CodesG01C 21/165 combined with non-inertial ...G01S 19/49 whereby the further system ...
