Methods for determining the present location coordinates of a user moving in a two-dimensional or three-dimensional space, with reference to an old map that may be inaccurate. Location coordinates (xi′,yi′) of two or three non-collinear landmarks in two dimensions), or coordinates (xi′,yi′,zi′) of t
Methods for determining the present location coordinates of a user moving in a two-dimensional or three-dimensional space, with reference to an old map that may be inaccurate. Location coordinates (xi′,yi′) of two or three non-collinear landmarks in two dimensions), or coordinates (xi′,yi′,zi′) of three or four non-coplanar landmarks (in three-dimensions), are indicated on the old map. Corresponding location coordinates (xi,yi) or (xi,yi,zi) are also determined or made available using a location determination system (LDS), such as GPS, GLONASS, Loran, Tacan, Decca, Omega, VOR, DME, JTIDS, PLRS or an FM subcarder system. Location coordinates (xi,yi) (or (xi,yi,zi)) for two or more physical landmarks can be combined into coordinates for a landmark representative. The user\s location coordinates (xu,yu) (or (xu,yu,zu)) are also determined or provided using the LDS. In a first class of embodiments, a transformation T (linear or not necessarily linear) is found that maps the LDS location coordinates (xi,yi) (or (xi,yi,zi)) onto the corresponding location coordinates (xi′,yi′) (or (xi′,yi′,zi′)) on the old map. The image of the location coordinate pair (xu,yu) (or triple (xu,yu,zu)) under the transformation T determines the user location coordinates on the old map. In a second class of embodiments, the range Ri from the user location to landmark number i (i=1, . . . , N; N=2,3) is determined in the LDS. Two or more locations are computed on the old map for which the range Ri′from landmark number i to this old map computed location is also equal to Ri, and one of these computed locations is designated as the user location on the old map. Several metrics are developed to measure the relative acceptability of an old map user location, as determined above.
대표청구항▼
A method for determining the location coordinates of a user on a two-dimensional surface, with reference to a map that may be substantially inaccurate, the method comprising the steps of: (1) providing a user with a location determination (LD) unit having an LD antenna and an LD receiver/processor t
A method for determining the location coordinates of a user on a two-dimensional surface, with reference to a map that may be substantially inaccurate, the method comprising the steps of: (1) providing a user with a location determination (LD) unit having an LD antenna and an LD receiver/processor that can determine the location coordinates of the user in an LD coordinate system and can determine or provide the location coordinates, relative to the user, of a chosen location that is spaced apart from the user\s location; (2) providing a selected map of a region that includes the user\s location and that has at least first and second landmark representatives with first and second map location coordinate pairs (xr1′,yr1′) and (xr2′,yr2′), respectively; (3) using the LD unit to determine user LD location coordinates (xu,yu) of the user\s location; (4) providing first and second LD location coordinate pairs (xr1,yr1) and (xr2,yr2) for the first and second landmark representatives, respectively, in the LD coordinate system; (5) using a computer to determine a coordinate transformation T of the LD location coordinate pairs (xr1,yr1) and (xr2,yr2) onto the respective map location coordinate pairs (xr1′,yr1′) and (xr2′,yr2′); (6) using the computer to express a user map location coordinate pair (xu′,yu′) on the selected map as the image under the transformation T of the user LD location coordinate pair (xu,yu); and (7) displaying the user map location coordinate pair (xu′,yu′) in at least one of a visually perceptible form and an audibly perceptible form.
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