Tactical differential GPS
A method for improving an accuracy of a radio based navigation system by correcting the position given by the radio based navigation system with a correction vector derived from localization data stored in a map database. Position coordinates of the radio based navigation system are measured. A set of 3D map data is selected based upon the measured position coordinates of the radio based navigation system position coordinates. The actual position is determined from the selected 3D map data. The actual position data coordinates are retrieved from the 3D map data based upon the determined actual position. The correction vector is calculated from position difference between measured radio based navigation system position coordinates and retrieved actual position coordinates. The position given by the radio based navigation system is corrected with the correction vector.
1. A method for improving an accuracy of a radio based navigation system by correcting a position given by the radio based navigation system with a correction vector, the method comprising:
measuring position coordinates of the radio based navigation system,
selecting based upon the measured position coordinates of the radio based navigation system position coordinates a set of 3D map data,
determining from the selected 3D map data an actual position,
retrieving based upon the determined actual position actual position data coordinates from the 3D map data,
calculating the correction vector from position difference between measured radio based navigation system position coordinates and retrieved actual position coordinates, wherein the correction vector is derived from localization data stored in a map database, and
correcting the position given by the radio based navigation system with the correction vector.
2. The method for improving the accuracy of a radio based navigation system according to claim 1 , wherein determining the actual position comprises:
displaying the 3D map data as a 3D map on a display, and
selecting actual position on the displayed 3D map.
3. The method for improving the accuracy of a radio based navigation system according to claim 2 , wherein the actual position on the displayed map is selected by marking the position on the display.
4. The method for improving the accuracy of a radio based navigation system according to claim 1 , wherein the actual position is determined by selecting the actual position with the 3D map data and an automatic input device recognizing the actual position.
5. The method for improving the accuracy of a radio based navigation system according to claim 4 , wherein the automatic input device is a computer vision system comprising an image sensor and image processing functionality.
6. The method for improving the accuracy of a radio based navigation system according to claim 1 , wherein the radio based navigation system is a GPS receiver.
7. The method for improving the accuracy of a radio based navigation system according to claim 1 , wherein the 3D map is created by Rapid 3D Mapping.