Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1994-11-03
1996-12-03
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342357, 364731, G01S 302, G01S 502, G06F 738
Patent
active
055812597
ABSTRACT:
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.
REFERENCES:
patent: 4179693 (1979-12-01), Evans et al.
patent: 4949089 (1990-08-01), Ruszkowsk, Jr.
Issing Gregory C.
Schipper John
Trimble Navigation Limited
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