Method and device for determining the actual position of a geodetic instrument
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Abstract
In order to determine the actual position (A) of a geodetic measuring instrument (1) inside a dead range (T) wherein signals originating from a positioning system are shadowed, two reference structures (5) are detected from at least two known positions and the distances associated with the reference structures (5) are measured. Image information linked to said distance measurements is captured. Said information contains data on the arrangement of the reference structures (5). The actual position (1) can be derived from subsequent capture of the reference structures (5) from a position inside the dead range (T). Image processing methods are used advantageously to identify and measure the reference structures (5).
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Citations
52 Claims
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21. Method for determining an actual position of a geodetic instrument comprising a positioning system which is based on the reception of shadowable signals and a dead range within which the propagation of the signal is impaired in such a way that a direct determination of the actual position by means of the positioning system is at least limited comprising the following acts:
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recording of a first piece of image information from a first known position determined by means of the positioning system, the first piece of image information having at least two identifiable reference structures which can be detected at least from a partial region of the dead range and measurement of at least one first distance from the first known position, the first distance being coordinated indirectly or directly with the reference structures;
recording of a second piece of image information from a second known position determined by means of the positioning system, the second piece of image information having at least the two identifiable reference structures and measurement of at least one second distance from the second known position, the second distance being coordinated indirectly or directly with the reference structures;
recording of a piece of actual image information from an actual position, the actual image information having at least the two identifiable reference structures and measurement of at least one actual distance from the actual position, the actual distance being coordinated indirectly or directly with the reference structures;
derivation of the actual position by referencing relative to the at least two reference structures. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification