Boots – shoes – and leggings
Patent
1991-10-04
1994-05-17
Harvey, Jack B.
Boots, shoes, and leggings
364505, 364516, 364561, 33290, 33291, 33293, 33294, 356152, G01N 2101
Patent
active
053134095
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an arrangement for performing position-determining and/or setting-out work for one-man surveying.
BACKGROUND OF THE INVENTION
It is known within geodetic surveying, or geodesy, to measure distances and angles by using electrooptical methods to determine the positions of measuring points in a relevant coordinate system. In one conventional method, an electrooptical distance measuring instrument (EDM) transmits a modulated light beam of infrared light, which is reflected from a prism of cubical configuration placed on the target point for the purpose of taking measurements. The light reflected by the prism is received and phase-detected, thereby enabling the distance to be determined with great accuracy. The vertical angle and horizontal direction to the target point can also be determined electrically or electrooptically. It is known to permit the measuring instrument to take repeated measurements and to continuously determine the position of a moving target, where the measuring instrument is directed onto the target manually.
It is also known for a measuring instrument to track or follow a target automatically with the aid of a servo drive controlled by a signal transmitted from or reflected by the target.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a simple and reliable arrangement to make the measuring instrument find alignment with a target point and rapidly and reliably track the target point irrespective of whether the target point is close to or far from the measuring instrument.
Another object of the present invention is to provide an arrangement which, during a target searching mode, can discriminate against to lock the measuring instrument to a false target.
Still another object of the present invention is to provide an arrangement which could be locked to the target during a target following mode even though the target is moving.
Thus, the invention relates to an arrangement which enables the instrument to seek the target point, and subsequent to being summoned, lock onto the target and track any further movement thereof. The measuring instrument is preferably based on an existing, so-called total station, e.g., a station having the registered trademark Geodimeter.sup.(R), which measures distances and angles in accordance with the foregoing. The station-setting arrangement is constructed so that the whole of the measuring procedure, including alignment of the instrument, initiation of the measuring process, data storage and computation can be readily carried out automatically and the setting-out work can be done by one single person operating with a unit placed on the target point. To date, it has been necessary to carry out measuring procedures with a person responsible for managing the measuring instrument and data registration, and a person responsible for placing a reflector unit on the measuring point. The arrangement of the measuring instrument and target point is controlled from the actual target point itself, where important information is found and where decisions are taken during the measuring procedure.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the accompanying drawings, in which:
FIG. 1 is a block diagram of one embodiment of the control arrangement forming part of the present invention,
FIG. 2 illustrates a measuring arrangement at work in the open countryside;
FIG. 3 is a perspective view of one embodiment of a measuring station;
FIG. 4 illustrates another embodiment of part of the arrangement shown in FIG. 1;
FIG. 5 illustrates a first embodiment of a detector;
FIG. 6 illustrates a second embodiment of a detector;
FIG. 7 is a schematic illustration of possible beam paths;
FIG. 8 is a schematic illustration of a coaxial system; and
FIG. 9 is a graph of compensation values.
DESCRIPTION OF PREFERRED EMBODIMENTS
The invention includes a measuring-instrument unit 1 and a target unit 2. Only the arrangement for aligning the ins
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Andersson Leif
Engdahl Olle
Ericsson Lars
Herztman Mikael
Wiklund Rudolf
Geotronics
Harvey Jack B.
Wachsman Hal D.
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