• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention provides a geodesy instrument, comprising a frame unit which can be rotated in a horizontal direction, a telescope unit rotatably mounted in a vertical direction on the frame unit and also for pointing an object to be measured, a horizontal guide unit for rotating and driving the frame unit in a horizontal direction, a vertical pointing unit for rotating the telescope unit in a vertical direction, a horizontal angle measuring unit for detecting a horizontal angle of the frame unit, a vertical angle measurement unit for detecting a vertical angle of the telescope unit and a control device, in which the control device is adapted to calculate a height of the sun.
    公开号:CH709876A2
    申请号:CH00954/15
    申请日:2015-07-02
    公开日:2016-01-15
    发明作者:Takeshi Ishida；Nobuyuki Nishita；Jumpei Kochi；Hiroyuki Nakabe；Garo Iwasaki
    申请人:Topcon Corp；
    IPC主号:
    专利说明:

    Known art
    [0001] The present invention refers to a geodesy instrument, by means of which it is possible to automatically perform a survey operation on the true north.
    [0002] In the case in which a geodesy instrument is installed in order to perform a survey operation, the true north is measured to set a pointing direction of the geodesy instrument. In one of the known methods to determine azimuth in an installation location, true north is detected using the sun.
    [0003] Where a position (latitude and longitude) in which the geodesy instrument is installed is already known, aiming is carried out starting from the installation position towards the sun using a telescope. A direction angle of the sun is therefore obtained in which the aiming is carried out, and the true north can be detected based on the direction angle and the instant of time in which pointing is made.
    [0004] Conventionally, where aiming is carried out on the sun, a geodesy operator directs the telescope towards the sun. In any case, it is dangerous for the operator to directly point through a telecopio, and by mounting a filter on the telescope and attenuating the light through the filter, aiming is performed on the sun. For this reason, where aiming is carried out on the sun, there is always a need for a filter installation operation to attenuate the light.
    [0005] Moreover, in the operation of directing the telescope towards the sun, the operator himself must stand directly in front of and towards the sun and there is the possibility that it will look directly at the sun. Looking directly at the sun itself is not desirable, and in the relief of the true north, the operation of performing a pointing on the sun must be carried out as an operation that requires to be performed with care.
    Summary of the invention
    [0006] It is the object of the present invention to provide a geodesy instrument, through which it is possible to perform true north relief in a safe and reliable manner for a geodesy operator without having the sun pointing.
    [0007] In order to achieve the objective as described above, a geodesy instrument according to the present invention comprises a frame unit rotatable in a horizontal direction, a telescope unit rotatably mounted in a vertical direction on the frame unit and furthermore for the aiming of an object to be measured, a horizontal guide unit for rotating and driving the frame unit in a horizontal direction, a vertical pointing unit for rotating the telescope unit in a vertical direction, a 'horizontal angle measurement unit to locate a horizontal angle of the frame unit, a vertical angle measurement unit to locate a vertical angle of the telescope unit and a control device, in which the control device is adapted to calculate a height of the sun at an instant in time by setting the coordinates in which the geodesy instrument is installed and the instant of time, and to make the telescope unit perform the setting of the sun's height as calculated by controlling the vertical aiming unit, to control the horizontal guide unit, to perform the sun search by rotating horizontally the unit of the frame at the height of the sun as set, to capture the sun, to point the sun, to find a horizontal angle in the pointing conditions based on the unit of measurement of the horizontal angle, and to measure a true north based on on the horizontal angle as identified.
    [0008] Furthermore, in the geodesy instrument according to the present invention, the telescope unit has a telescope for pointing an object to be measured and an image pickup unit for acquiring an image in a pointing direction through the telescope, in which the control device captures the sun through the telescope and makes the sun point at the telescope based on an image acquired through the telescope.
    [0009] Furthermore, in the geodesy instrument according to the present invention, the telescope unit has a telescope for pointing an object to be measured, an image pickup unit for acquiring an image in a pointing direction through the telescope and a wide-angle video camera having an optical axis which is in a known relationship with an optical axis of the telescope and having a field angle greater than that of the telescope, in which the control device captures the sun by means of the wide-angle camera and tip the sun through the telescope based on the image acquired by the wide-angle camera and the known relationship.
    [0010] Furthermore, in the geodesy instrument according to the present invention, the telescope unit has a telescope for pointing an object to be measured, an image pickup unit for acquiring an image in a pointing direction through the telescope and a wide-angle video camera having an optical axis which is in a known relationship with an optical axis of the telescope and having a field angle greater than that of the telescope, in which the control device captures the sun through the wide-angle camera and points the alone through the wide-angle camera based on an image captured by the wide-angle camera.
    [0011] Furthermore, in the geodesy instrument according to the present invention, a sun pointing position is set on a photodetector element of the wide-angle video camera, and the sun pointing position and an optical axis of the telescope are in a known relation and the pointing position of the sun is a known position deviated from the field of view of the telescope, in which the control device detects a center of an image of the sun from an image acquired by the wide-angle camera, controls the horizontal driving unit and the vertical pointing unit in such a way that the center of the sun image coincides with the sun pointing position and is adapted to determine the true north based on an instant of time in which the center of the image of the sun coincides with the position of pointing of the sun, a horizontal angle as identified by a unit of measurement of the horizontal angle, a verti angle as identified by a vertical angle measurement unit, the position of the sun pointing with respect to the optical axis of the telescope and the coordinates in which the geodesy instrument is installed.
    [0012] Furthermore, the geodesy instrument according to the present invention comprises a GPS in which the coordinates and the measurement instant of the geodesy instrument are obtained by means of GPS.
    [0013] According to the present invention, the geodesy instrument comprises a frame unit which can be rotated in a horizontal direction, a telescope unit rotatably mounted in a vertical direction on the frame unit and also for pointing an object to be measured , a horizontal guide unit for rotating and driving the frame unit in a horizontal direction, a vertical pointing unit for rotating the telescope unit in a vertical direction, a horizontal angle measuring unit for detecting a horizontal angle of the frame unit, a vertical angle measurement unit for detecting a vertical angle of the telescope unit and a control device, in which the control device is adapted to calculate a height of the sun to an instant of time setting the coordinates in which the geodesy instrument is installed and the instant of time, and to have the unit set telescope the height of the sun as calculated by controlling the vertical aiming unit, to control the horizontal guide unit, to perform the sun search by rotating the frame unit horizontally at the height of the sun as set, to capture the sun, to point to the sun, to identify a horizontal angle in the pointing conditions based on the unit of measurement of the horizontal angle, and to measure a true north based on the horizontal angle as identified. Consequently, by simply setting the coordinates and an instant of installation time of the geodesy instrument, the geodesy operator can easily perform the survey of true north without aiming a telescope.
    [0014] Furthermore, according to the present invention, in the geodesy instrument, the telescope unit has a telescope for pointing an object to be measured and an image pickup unit for acquiring an image in a pointing direction through the telescope, in which the control device captures the sun through the telescope and points the sun at the telescope based on an image acquired through the telescope. As a result, the sun can be pointed in a simple way through the telescope.
    [0015] Furthermore, according to the present invention, in the geodesy instrument, the telescope unit has a telescope for pointing an object to be measured, an image pickup unit for acquiring an image in a pointing direction through the telescope and a wide-angle video camera having an optical axis which is in a known relationship with an optical axis of the telescope and having a field angle greater than that of the telescope, in which the control device captures the sun by means of the wide-angle camera and point the sun through the telescope based on the image acquired by the wide-angle camera and on the known relationship. As a result, accuracy is not required when capturing the sun, and sun pointing can be performed in a simple way.
    [0016] Furthermore, according to the present invention, in the geodesy instrument, the telescope unit has a telescope for pointing an object to be measured, an image pickup unit for acquiring an image in a pointing direction through the telescope and a wide-angle video camera having an optical axis which is in a known relationship with an optical axis of the telescope and having a field angle greater than that of the telescope, in which the control device captures the sun by means of a wide-angle video camera and point the sun through the wide-angle camera based on an image captured by the wide-angle camera. As a result, accuracy is not necessary during sun capture, and sun pointing can be performed in a simple way.
    [0017] Furthermore, according to the present invention, in the geodesy instrument, a sun pointing position is set on a photodetector element of the wide-angle video camera, the sun pointing position and an optical axis of the telescope are in a known relation and the pointing position of the sun is a known position deviated by a field of view of the telescope, in which the control device detects a center of an image of the sun from an image acquired by the wide-angle camera, controls the horizontal guide unit and the vertical aiming unit such that the center of the sun image coincides with the sun pointing position and is adapted to determine the true north based on an instant of time in which the center of the image of the sun coincides with the sun pointing position, a horizontal angle as identified by a horizontal angle measurement unit, an angle vertical as identified by a vertical angle measurement unit, the position of the sun pointing with respect to the optical axis of the telescope and coordinates where the geodesy instrument is installed. Consequently, it is not necessary to aim the sun directly by means of a telescope with high magnification and this helps to prevent the deterioration and damage of the image pickup device.
    [0018] Furthermore, according to the present invention, the geodesy instrument comprises a GPS in which the coordinates and the measurement time of the geodesy instrument are obtained through a GPS. As a result, it can be omitted to enter coordinates and measurement time of the geodesy instrument, and it is possible to perform true north relief more easily.
    Brief description of the figures
    [0019]<tb> Fig. 1 <SEP> is an external schematic view of a geodesy instrument according to an embodiment of the present invention.<tb> Fig. 2 <SEP> is a block diagram to show an approximate arrangement of the geodesy tool.<tb> Fig. 3 <SEP> is an explanatory drawing relating to the relief of a true north.<tb> Fig. 4 <SEP> is an explanatory drawing of a condition in which aiming is performed on the sun by means of the geodesy instrument.<tb> Fig. 5 <SEP> is an explanatory drawing to show a relationship between the field of view of a telescope on a photodetector element of a wide-angle video camera and a position for pointing the sun in the present embodiment.
    Detailed description of the preferred embodiment
    [0020] The description will be provided on an embodiment of the present invention with reference to the annexed drawings.
    [0021] Fig. 1 and fig. 2 show a geodesy instrument 1, to which the present invention refers. It is noted that the geodesy instrument 1 as used is a complete station, for example, and has a tracking function. A pulsed laser beam is projected towards a measurement point where a distance measurement light is received, a reflected light (hereinafter referred to as a "reflecting light") of the light measuring the distance to the measurement point and a distance is measured for each pulse of light. Collecting an average value of distance measurement results, distance measurement is performed with high precision.
    [0022] As shown in fig. 1, the geodesy instrument 1 primarily comprises a leveling unit 2 mounted on a tripod (not shown), a base unit 3 mounted on the leveling unit 2, a frame unit 4 rotatably mounted around a vertical axis as a center on the base unit 3 and a telescope unit 5 rotatably mounted around a horizontal axis as a center on the frame unit 4.
    [0023] The frame unit 4 comprises a display unit 6 and an operation input unit 7. The telescope unit 5 has a telescope 8 for pointing an object to be measured and a measuring unit of the distance 11, which commonly shares an optical system of the telescope 8. Furthermore, the telescope unit 5 has an image pickup unit 12 for acquiring an image in a pointing direction through the optical system of the telescope 8. Furthermore , the telescope unit 5 comprises a wide-angle video camera 9. The wide-angle video camera 9 has an optical axis parallel to an optical axis of the telescope 8, and can acquire a wide-angle image in the pointing direction in an approximate pointing direction of the telescope 8.
    [0024] A field angle of telescope 8 is 1, for example, and a field angle of the wide-angle camera 9 is from 15 ° to 30 °, for example. Furthermore, although the optical axis of the telescope 8 is different from the optical axis of the wide-angle video camera 9, a distance between these optical axes is already known, and a deviation of the pointing direction between the wide-angle video camera 9 and the telescope 8 can be corrected. through an elaboration.
    [0025] Each of the wide-angle video camera 9 and the image pickup unit 12 produces an image captured as a digital image signal. The photodetector element of each of the wide-angle video camera 9 and the image pickup unit 12 is a CCD, a CMOS, etc., for example, which is an aggregate of pixels and is configured in such a way that the position of the pixel that must be received can be specified and that a field angle can be detected from a position of the pixel to be received.
    [0026] With reference to fig. 2, a description of a basic configuration of the geodesy tool 1 will be provided.
    [0027] As described above, the telescope unit 5 houses the distance measurement unit 11, which commonly shares an optical system of the telescope 8. The distance measurement unit 11 emits a pulsed laser beam as a distance measuring light through the optical system and receives a light reflected from an object to be measured through the optical system, and performs an electro-optical distance measurement towards the object to be measured based on the reflected light as received.
    [0028] In case the object to be measured is a prism, the distance measuring unit 11 can perform the measurement in a prismatic measurement mode. Furthermore, if the object to be measured is not a prism, the distance measuring unit 11 can perform the measurement in a non-prismatic measurement mode. Furthermore, a measurement mode can be switched according to the object to be measured.
    [0029] On the frame unit 4, a horizontal guide unit 15 is provided to rotate the frame unit 4 in a horizontal direction, and a horizontal corner measurement unit 16 to locate a horizontal rotation angle and to locate a horizontal angle of a pointing direction is provided with respect to the base unit 3 of the frame unit 4. Furthermore, on the frame unit 4, a vertical aiming unit 17 is provided, which rotates around to the telescope unit 5 with a horizontal axis as center and a vertical angle measurement unit 18 is provided, which identifies a vertical angle of the telescope unit 5 and measures a vertical angle in the pointing direction.
    [0030] Furthermore, on the frame unit 4, an inclination measurement unit 14 is provided and the inclination measurement unit 14 identifies an inclination or horizontality of the frame unit 4.
    [0031] A control device 21 is housed in the frame unit 4. Based on an identification result of the inclination measurement unit 14, the control device 21 controls the leveling unit 2 and levels the unit. of frame 4 in a horizontal direction.
    [0032] Furthermore, the control unit 21 controls the driving of the horizontal guide unit 15 and rotates the frame unit 4 in a horizontal direction, and moreover, controls the driving of the vertical pointing unit 17 and rotates the 5 telescope unit in an elevation direction. With a cooperative movement of a rotation in the horizontal direction and a rotation in the direction of elevation, the telescope unit 5 is directed towards a predetermined direction.
    [0033] Furthermore, the control device 21 identifies, follows and performs a measurement of the true north on the sun based on the image acquired by the wide-angle video camera 9 and controls the tracking of the object to be measured based on the acquired image of pickup unit 12 image. Furthermore, based on the image acquired by the wide-angle video camera 9 and on the image acquired by the image pickup unit 12, the control device 21 performs a search to capture the object to be measured in the image (in a visual field of a telescope) before starting the tracking, or if the object to be measured is deviated from the image during the tracking, the search is performed to capture it again in the image.
    [0034] Furthermore, the control device 21 performs a distance measurement at a predetermined measuring point by controlling the distance measuring unit 11 in a stable condition or during tracking.
    [0035] With reference to fig. 2, a description of the control device 21 is also provided.
    [0036] The control device 21 is composed of an arithmetic control unit 22, a storage unit 23, a first image recording unit 24 for recording the images acquired by the wide-angle video camera 9, a second unit of image recording 25 for recording the images acquired by the image pickup unit 12, an image processing unit 26 for performing image processing including a specification of a measurement point or an object to be measured based on the image acquired by the wide-angle camera 9 and the image acquired by the image pickup unit 12, the display unit 6 for the representation of measurement results and measurement conditions, and the unit of input operations 7 for the introduction of various types of commands including the start of the measurement or similar or for the introduction of the data necessary for the measurement is.
    [0037] In the storage unit 23, different types of programs are stored. These programs include: a sequential program for performing the measurement, an image display program for displaying on the image processing unit 26, a calculation program for calculating a sun height (vertical angle) based on values of coordinates (latitude and longitude) and an instant of time and to perform the calculations necessary for the measurement (distance measurement and angle measurement), an image processing program to perform image processing acquired by the wide-angle camera 9 and the image pickup unit 12, a true north identification program to calculate the position of the sun from the images as processed and to perform true north measurement, a distance measurement program to measure a distance with respect to at the measurement point and to measure the distance by tracking the object to be measured, a rice program rca to capture the object to be measured in images and other programs.
    [0038] Furthermore, the measurement results are introduced on the arithmetic control unit 22 from the distance measuring unit 11, the horizontal angle measurement unit 16 and the vertical angle measurement unit 18. L arithmetic control unit 22 performs distance measurement, vertical angle and horizontal angle according to the sequential program, the arithmetic program, the distance measurement program, etc., and calculates a sun height according to the program calculation of the height of the sun. Moreover, the arithmetic control unit 22 is configured so as to perform a search operation by driving and controlling the horizontal guide unit 15 and the vertical pointing unit 17, and stores the measurement results in the storage unit 23 and represents them on the display unit 6 according to the image display program or similar.
    [0039] The image processing program ensures that the image processing unit 26 performs image processing such as, for example, an extraction of the measurement point or the object to be measured based on the image captured by the wide-angle camera 9 and the image acquired by the image pickup unit 12.
    [0040] Furthermore, the arithmetic control unit 22 can perform a normal survey mode with respect to the object to be measured according to the distance measurement program and a survey mode of the true north to perform the survey of true north according to the program of relief of the true north. Selecting a measurement mode from the operations input unit 7, a survey operation of the true north can be performed as required.
    [0041] In the following a description will be given for the operation in the case in which the relief of the true north is carried out through the geodesy instrument 1 according to the present embodiment.
    [0042] The geodesy instrument 1 is installed in a known point, for example in a point where a latitude and a longitude are already known, and the leveling is carried out through the leveling unit 2.
    [0043] The real north survey mode is selected by the operations input unit 7. It is noted that in the case where the true north survey mode is selected, a light attenuating filter (not shown) is mounted respectively on each of the telescope 8 and the wide-angle camera 9.
    [0044] The latitude and longitude of the installation position and the measurement instant are introduced at the input of the control device 21 through the operations input unit 7. It is pointed out that in the case where the geodesy instrument 1 is equipped with a GPS, a geodetic instrument 1 installation coordinate is obtained from the GPS and the measurement time can be obtained from the GPS.
    [0045] When the latitude, longitude and measurement instant are introduced, the control device 21 calculates a height of the sun. The relationship between latitude, longitude, height and an azimuth is shown in fig. 3 In fig. 3, a central position is a position in which the geodesy instrument is installed 1.
    [0046] When the height of the sun is calculated, the vertical aiming unit 17 rotates the telescope unit 5 in a vertical direction. Based on the identification results of the vertical angle measurement unit 18, a vertical angle in a pointing direction of telescope 8 is made to coincide with the height of the sun (see fig. 4).
    [0047] When the vertical angle by the vertical angle measuring unit 18 coincides with the height of the sun, the control device 21 generates a control signal to the horizontal guide unit 15, and the unit of frame 4 is rotated in a horizontal direction from the horizontal guide unit 15 in the condition in which the vertical angle of the telescope unit 5 is maintained.
    [0048] As shown in fig. 3, if the frame unit 4 is rotated horizontally by 360 ° in the condition in which the pointing direction coincides with the height of the sun, the sun can be captured without errors in the field of view of the telescope 8 at a given point of rotation 360 ° horizontal (looking for the sun). When the sun is captured within the field of view of telescope 8, the geodesy instrument 1 performs a tracking function and can accurately aim the sun. It is possible to judge whether telescope 8 has captured the sun or not based on the image acquired by the image pickup unit 12.
    [0049] The sun is accurately pointed by the telescope 8 and a horizontal angle at the pointing position is measured by the horizontal angle measurement unit 16. Furthermore, the time at which it is accurately pointed is obtained by the GPS. The control device 21 is able to detect the north versus recalculating an azimuth angle (see fig. 3) based on the time point of the aiming, the horizontal angle measured by the horizontal angle measurement unit 16 and l vertical angle measured by the vertical angle measurement unit 18.
    [0050] It is pointed out that the relief of the true north as described above is carried out by pointing the sun from the telescope 8, while the relief of the true north can be detected based on the image acquired by the wide-angle camera 9.
    [0051] The relationship between an optical axis of the wide-angle video camera 9 and an optical axis of the telescope 8 is already known. For example, the optical axis of the wide-angle camera 9 and the optical axis of the telescope 8 run in parallel with each other, and a distance between the two optical axes is already known.
    [0052] In the event that true north measurement is made using the wide-angle camera 9, the sun can be captured via the wide-angle camera 9 if the direction is approximately adequate since a field of view of the wide-angle camera 9 is wide.
    [0053] When the height of the sun is calculated by the control device 21, the vertical pointing unit 17 rotates the telescope unit 5 in the vertical direction based on a processing result, and the vertical angle in the pointing direction of the wide-angle camera 9 is made to coincide with the height of the sun. In the condition in which the vertical angle of the telescope unit 5 is maintained, the frame unit 4 is rotated in the horizontal direction by the horizontal guide unit 15, and a sun search is performed by the wide-angle camera 9.
    [0054] When the sun is captured by the wide-angle camera 9, the optical axis of the telescope 8 is made to coincide with the sun (pointing the sun from the telescope 8) based on the position of the sun on the image of the wide-angle camera 9 as the relation between the optical axis of the wide-angle camera 9 and the optical axis of the telescope 8 is already known.
    [0055] Therefore, the sun is sought by the wide-angle camera 9 and the sun is pointed by the telescope 8 based on the search result through the wide-angle camera 9. As the wide-angle camera 9 is designed to have a wide angle, the search for the sun it can be performed quickly and the aiming of the sun can be performed effectively and at high speed.
    [0056] Later, true north measurement can only be performed via the wide-angle camera 9.
    [0057] The control device 21 calculates a height of the sun. Based on the height of the sun thus calculated, the vertical pointing unit 17 rotates the telescope unit 5 in a vertical direction and causes a vertical angle in a pointing direction of the wide-angle video camera 9 to be made coincident with the height of the sun. In the condition in which a vertical angle of the telescope unit 5 is maintained, the frame unit 4 is rotated in a horizontal direction by the horizontal guide unit 15 and a sun search is performed by the wide-angle camera 9.
    [0058] On the image of the wide-angle video camera 9, a pointing position is set in which the sun is to be aimed by the wide-angle camera 9. The pointing position is preferably a position of an optical axis of the wide-angle camera 9. Furthermore, the pointing position is set as deviated from the pointing position of the telescope 8 (optical axis of the telescope 8).
    [0059] As shown in fig. 5, the relationship between a sun pointing position of the wide-angle video camera 9 and the pointing position of the telescope 8 is such that an image 32 of the sun deviates entirely from a field of view 31 of the telescope 8. Furthermore, an amount of position of pointing the sun with respect to the pointing position of the telescope 8 is already known, and the amount is at least an amount, which is deviated from the field of view 31 of the telescope 8. Since the amount of deviation between the position of pointing of the sun and the pointing position of the telescope 8 is already known, the sun pointing position can be corrected so as to be made coincident with the telescope 8 pointing position through processing.
    [0060] Fig. 5 shows a condition in which the sun is finally aimed through the wide-angle camera 9. The sun pointing position can be deviated in every direction with respect to the telescope 8 pointing position, but it is deviated in a vertical direction in order to reduce the error of calibrating a horizontal angle since the accuracy of the horizontal angle is important in the relief of true north.
    [0061] Furthermore, there is a configuration such that an image taken through the wide-angle video camera 9 is shown on the display unit 6 and this can be easily confirmed through an image 30 of the display unit 6 verifying whether the sun is captured via the wide-angle 9 video camera or less.
    [0062] The image processing unit 26 extracts the image 32 of the sun by processing an image from the first image recording unit 24 and identifies the central position of the image 32 of the sun. The image processing unit 26 compares the central position of the sun image 32 with the sun pointing position, calculates the amount of deviation and a direction of deviation between the central position of the sun image 32 and the sun pointing position, and the result of the calculation is introduced at the input of the arithmetic control unit 22.
    [0063] Based on the amount of deviation and on the deviation of the direction as introduced by the image processing unit 26, the leveling unit 2 drives the horizontal guide unit 15 and the vertical pointing unit 17 and makes the position of the image 32 of the sun as identified coinciding with the position of pointing of the sun.
    [0064] In the instant of time in which the coincidence is made, a horizontal angle identified by the unit of measurement of the horizontal angle 16 and a vertical angle identified by the vertical angle measurement unit 18 are captured.
    [0065] Regarding the instant in which the coincidence is caught and the horizontal angle and the vertical angle as identified, the horizontal angle and the vertical angle are corrected based on the amount of deviation between the position of pointing of the sun and the pointing position of the telescope 8, and moreover, the true north is measured based on the latitude and longitude of the installation position. Therefore, the measurement of true north can be performed in the condition in which the telescope 8 does not point to the sun.
    [0066] Furthermore, in the case where the relief of the true north is performed by the wide-angle camera 9 only, it can be done in such a way that the sun does not fall within the field of view of the telescope 8.
    [0067] On the photodetector element of the wide-angle video camera 9, an interval corresponding to the visual field 31 of the telescope 8 is set as the photodetection prohibition zone.
    [0068] The arithmetic control unit 22 calculates a path to move the central position of the sun image 32 from the sun pointing position from the central sun position to the sun pointing position.
    [0069] Moreover, in the case in which the central position of the sun on the photodetector element is made to coincide with the position of pointing of the sun and in the case in which the central position of the image of the sun passes through the visual field 31 of the telescope 8 in the condition in which this is moved on the shortest distance, the arithmetic control unit 22 calculates a path in order to reach the sun pointing position avoiding the visual field 31 of the telescope 8 and performs the piloting and control on the unit of horizontal guide 15 and on the vertical angle measurement unit 18 based on the calculated path.
    [0070] Alternatively, any shutter of an electrical, mechanical type, etc. it can be installed on the optical system of the telescope e, and it can be configured in such a way that an optical path of the telescope 8 is intercepted in the relief mode of the true north of the wide-angle camera 9.
    [0071] In the present embodiment, in which the true north measurement is carried out, the geodesy instrument 1 automatically searches for the sun simply by entering the coordinate data and the time instant in the geodesy instrument 1 and the north measurement true is done automatically. Furthermore, the processing condition of the true north measurement and the result of the true north measurement can be confirmed by the display unit 6, which contributes to a more efficient execution.
    [0072] By setting the survey mode of true north, the entry of sunlight into telescope 8 at high magnification can be avoided. Consequently, the introduction of a strong light on the photo-detecting element of the image pickup unit 12 can be confined, and the deterioration and damage of the photodetector element can be avoided.
    [0073] There is no need to say that, when the normal survey mode is selected at the start of the measurement, from the operations input unit 7, it is possible to perform a distance measurement and a corner measurement on a object to be measured or on the measurement by tracking the object to be measured.
    权利要求:
    Claims (7)
    [1]
    1. A geodesy instrument (1) comprising a frame unit (4) rotatable in a horizontal direction, a telescope unit (5) rotatably mounted in a vertical direction on said frame unit and furthermore for pointing a object to be measured, a horizontal guide unit (15) for rotating and driving said frame unit in a horizontal direction, a vertical pointing unit (17) for rotating said telescope unit in a vertical direction, a unit of measuring the horizontal angle (16) to locate a horizontal angle of said frame unit, a vertical angle measurement unit (18) for detecting a vertical angle of said telescope unit and a control device (21), wherein said control device is adapted to calculate a height of the sun at a time instant by setting coordinates in which said geodesy instrument is installed and called the time instant, and to do ch and the said telescope unit sets the height of the sun as calculated by controlling said vertical aiming unit, to control said horizontal guide unit, to perform the search for the sun by rotating said frame unit horizontally at the height of the sun as set, to capture the sun, to aim the sun, to find a horizontal angle at the pointing conditions based on the said horizontal angle measurement unit, and to detect a true north based on the horizontal angle as identified.
    [2]
    2. A geodesy instrument according to claim 1, wherein said telescope unit (5) has a telescope (8) for pointing an object to be measured and an image pickup unit (12) to acquire a image in a pointing direction through said telescope, in which said control device (21) captures the sun through said telescope and causes said telescope to point the sun based on an image acquired through said telescope.
    [3]
    3. A geodesy instrument according to claim 1, wherein said telescope unit (5) has a telescope (8) for pointing an object to be measured, an image pickup unit (12) for acquiring a image in a pointing direction through said telescope and a wide-angle video camera (9) having an optical axis which is in a known relationship with an optical axis of said telescope and having a wider field angle than that of said telescope, in which said control device (21) captures the sun through said wide-angle video camera and points the sun through said telescope based on the image acquired by said wide-angle video camera and said known relationship.
    [4]
    4. A geodesy instrument according to claim 1, wherein said telescope unit (5) has a telescope (8) for pointing an object to be measured, an image pickup unit (12) for acquiring a image in a pointing direction through said telescope and a wide-angle video camera (9) having an optical axis which is in a known relationship with an optical axis of said telescope and having a wider field angle than that of said telescope, in which said control device (21) captures the sun via said wide-angle video camera and points the sun through said wide-angle video camera based on an image acquired by said wide-angle video camera.
    [5]
    5. A geodesy instrument according to claim 3 or claim 4, wherein a sun pointing position is set on a photo-detecting element of said wide-angle video camera (9), said sun pointing position and an optical axis of said telescope (8) are in a known relationship and said sun pointing position is a known position deviated from a field of view (31) of said telescope, wherein said control device detects a center of an image (32) of the sun starting from an image acquired by said wide-angle video camera, it controls said horizontal guide unit (15) and said vertical pointing unit (17) so that the center of said image of the sun coincides with said sun pointing position and is adapted to determine true north based on a time instant in which the center of said sun image coincides with said sun pointing position, such a horizontal angle as identified a unit of measurement of the horizontal angle (16), a vertical angle as identified by a vertical angle measurement unit (18), said position for pointing the sun with respect to said optical axis of said telescope and coordinates in which this geodesy instrument (1) is installed.
    [6]
    6. A geodesy instrument according to one of claims 1–4, further comprising a GPS in which coordinates and measurement instant of said geodesy instrument (1) are obtained by means of said GPS.
    [7]
    7. A geodesy instrument according to claim 5, further comprising a GPS in which coordinates and measurement instant of said geodesy instrument (1) are obtained by means of said GPS.
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    法律状态:
    优先权:
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