JPH0786818A - Antenna installing height position selector - Google Patents

Abstract

PURPOSE:To provide an antenna installing height position selector capable of selecting a height position with improved reception conditions. CONSTITUTION:A tripod 2 is provided, a pole extension mechanism 8 capable of extending a pole upward is provided in the tripod 2 and a strut 22 formed by connecting the plural freely connectably and detachably formed poles 21 is freely ascendably and descendably provided in the pole supplying mechanism 8. A video input device 30 is provided upward on the upper end of the strut 22, a small-sized monitor 41 for outputting video images inputted from the video input device 30 is connected to the video input device 30 and a cylindrical transparent cap 37 whose center is the optical axis CT2 of the video input device 30 is provided on the upper part of the video input device 30. First to third equal elevation angle lines 39a-39c are respectively horizontally provided around the outer periphery of the transparent cap 37, a magnet disk 40 whose magnetic needles is put in a transparent case is provided on the top board 37c of the transparent cap 37 and measures 21c are provided on the strut 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna installation capable of selecting a height position with good reception conditions of the GPS antenna when the GPS antenna should be installed at a high place in order to avoid obstacles such as forests. The present invention relates to a height position selecting device.

[0002]

2. Description of the Related Art Conventionally, when a GPS antenna has to be installed at a high place, the antenna attached to the tip of a long pole is visually detected to be located at a higher position than a shield such as a forest. And was installed at the height position.

[0003]

However, in the past, the GPS antenna was installed at a position higher than the shield by visual observation, so that the GPS antenna is actually located at a position where reception conditions are good. It was not possible to know whether or not it was installed in. Therefore, the GPS antenna is actually too low and is installed at a height position where reception conditions are not good, or conversely, the GPS antenna is actually installed at a position higher than necessary. Was there.

In view of the above circumstances, it is an object of the present invention to provide an antenna installation height position selecting device capable of selecting a height position having a good reception condition.

The first invention of the present invention has a support means (2), and a payout means (6, 7, 9) capable of paying out a pole upward to the support means (2). ,
11, 16) are provided, and the feeding means (6, 7, 9,
11 and 16), a supporting pole (22) formed by adding a plurality of connecting poles (21) that are replenished and detachable to each other is provided to be movable up and down, and an image input unit is provided at the upper end of the supporting pole (22). (30) is provided upward, and a video output unit (41) for outputting a video input from the video input unit (30) is connected to the video input unit (30), and the video input unit (30) is connected. ), The iso-elevation line indicating means (37, 39
a, 39b, 39c) to the equi-elevation line indicating means (37,
39a, 39b, 39c), the equi-elevation angle lines (39a, 39b, 39c) indicated by the image output unit (41).
The image input section (30) is provided with a direction indicating means (40) so that the direction indicated by the direction indicating means (40) is the image output section (41). ) Is provided in the form of being displayed on the video output to. The second invention of the present invention is the same as the first invention, wherein the height display means (21) is provided on the column (22).
c) is provided. The numbers in () are
It is to be understood that the corresponding elements in the drawings are shown for convenience and the present description is not limited to the description of the drawings. The same applies to the following action columns.

[0005]

With the above-mentioned structure, the first aspect of the present invention is that the image input section (3) provided at the upper end of the support column (22).
0) can be moved and positioned in the vertical direction by operating the feeding means (6, 7, 9, 11, 16). The second aspect of the present invention operates so that the height display means (21c) provided on the support column (22) can detect the height position of the video input section (30).

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of an antenna installation height position selecting device of the present invention. FIG. 2 is a view showing a pole feeding mechanism of the antenna installation height position selecting device of FIG. FIG. 3 is a sectional view taken along the line I and I of FIG. FIG. 4 is a sectional view taken along the line II and II in FIG. FIG. 5 is an enlarged front view showing the video input device of FIG. FIG. 6 is a plan view showing the video input device of FIG. FIG. 7 is a diagram showing a small monitor that outputs an image input from the image input device of FIG. FIG. 8 is a diagram in which the video input device of the antenna installation height position selecting device of FIG. 1 is removed and a GPS antenna is provided instead. The antenna installation height position selecting device 1 of the present invention has a tripod 2 as shown in FIG.
A box 3 forming a hollow rectangular parallelepiped is attached to the upper end (upper end in the figure) of which the bottom surface 3f is directed vertically downward (downward in the figure). As shown in FIG. 2, a circular insertion hole 3d is formed in the center of the bottom surface 3f of the box 3 in a direction perpendicular to the bottom surface 3f.
In g, a feeding hole 3e having the same shape as the insertion hole 3d is formed in a direction perpendicular to the bottom surface 3f from the center of the insertion hole 3d, that is, at a position on the center line CL of the box 3. On the upper surface of the box 3, a spring type stopper 20 is attached to the outer periphery of the feeding hole 3e, that is, the spring type stopper 20 is, as shown in FIG.
A fixed block 20a fixed to the upper surface of the box 3 having a concave surface formed in a semicircular shape along the outer circumference of the box 3
have. A spring 2 is provided at both ends of the fixed block 20a.
0b, 20b are provided, and the springs 20b, 20b are provided with a U-shaped moving block 20c.
By connecting both ends of 0c to the ends of the springs 20b, 20b, the concave surface of the moving block 20c is directed to the semicircular concave surface of the fixed block 20a, and the direction toward the fixed block 20a, that is, in the directions of arrows I and J in FIG. It is provided in a freely movable form. At the center of the moving block 20c, the fixed block 20
A screw hole 20c1 is formed in the horizontal direction toward a, and a screw 20d is screwed into and penetrates the screw hole 20c1. At the tip of the screw 20d, a pressing plate 20e forming a C-shape is arranged so that its concave surface faces the fixed block 20a and is rotatable about the center line of the screw 20d.
Together with the movable block 20c, the fixed block 20a
Is provided so as to be movable in the direction toward the arrow, that is, in the directions of arrows I and J in FIG. As shown in FIG. 2, in the box 3, a shaft hole 3b is formed in a side surface 3a in a direction perpendicular to the side surface 3a. The shaft hole 3b has a worm 7, a worm wheel 9, and a roller, which will be described later. The drive shaft 5, which constitutes the pole feeding mechanism 8 together with 11, 16 and the guide roller 19, is passed through in the horizontal direction which is the direction perpendicular to the side surface 3a. A handwheel handle 6 is attached to the drive shaft 5 so as to rotate the drive shaft 5 around the axis CT. A cylindrical worm 7 is fitted on the outer peripheral surface of the end of the drive shaft 5 that is inserted into the box 3, and a worm wheel 9 is attached to the worm 7 perpendicularly to the worm 7. A shaft hole 9a bored in the center of the worm wheel 9 is meshed with the drive shaft 5 in a horizontal direction perpendicular to the drive shaft 5. As shown in FIGS. 2 and 4, the rotary shaft 10 is inserted into the shaft hole 9a of the worm wheel 9,
Both ends of the rotary shaft 10 are provided on two side faces 3c, 3c adjacent to the side face 3a of the box 3 at a position closer to the side face 3a than the center line CL of the box 3 shown in FIG. 4 and perpendicular to the side faces 3c, 3c. And is rotatably supported around its axis of rotation, that is, in the directions of arrows E and F in FIG. A roller 11 formed in an hourglass shape with an elastic material such as rubber is fitted in the central portion of the rotary shaft 10. The rotary shaft 10 is provided on the opposite side of the worm wheel 9 with the roller 11 interposed therebetween. The large spur gear 12 is fitted. A large spur gear 12 has a large spur gear 13 of the same shape as that of the large spur gear 12, which is horizontally adjacent to the large spur gear 12. The box 10 is attached to the box 10 in a laterally symmetrical position in FIG. 4 about the center line CL of the box 3. Both ends of the rotary shaft 15 are
On the side surfaces 3c, 3c of the box 3, perpendicularly to the side surfaces 3c, 3c, around the axis of the rotating shaft 15, that is, an arrow G in the drawing,
It is rotatably supported in the H direction, and is formed in an hourglass shape at the central portion of the rotary shaft 15, that is, at a position facing the roller 11, the elastic material having the same shape as the roller 11, that is, the same quality, that is, rubber or the like. The roller 16 is fitted to the roller 11 with a predetermined gap L1. As shown in FIG. 2, the rotary shaft 1 and the rotary shaft 10 arranged side by side at equal intervals from the center line CL in the horizontal plane above and below the rotary shaft 15, respectively.
0 and the rotary shaft 15, a plurality of sets of guide shafts 17, 17, which are arranged in parallel in the horizontal plane at equal intervals from the center line CL, are provided in parallel with the rotary shaft 10 and the rotary shaft 15. Both ends of the shafts 17 and 17 have side surfaces 3c and 3c.
Is pivoted by. In addition, the guide rollers 1 formed in a drum shape are provided at the central portions of the guide shafts 17 and 17, respectively.
9 and 19 are fitted to face each other with a predetermined gap L1. Further, as shown in FIG. 1, the box 3 is supported by the tripod 2 so that the height of the upper end of the spring type stopper 20 provided on the upper surface 3g of the box 3 becomes a predetermined height L4. Outlet hole 3e from insertion hole 3d of box 3
In between, as shown in FIG. 1, a pole 21 formed of a highly rigid material with a predetermined length L3 that is easy to carry is formed by a plurality of guide rollers 19, and the center line of the rollers 11 and 16. Is rectified so as to coincide with the center line CL of the box 3, and the pole 21 is moved by the roller 11 and the roller 16 in the vertical direction, that is, the positions of the arrows A and B in FIG. It is supported so that it can be positioned freely. The pole 21 has a female screw 21 on the upper end.
a has a male screw 21b screwed on the lower end, and a pole 21 of the same shape and quality is added in such a manner that the centers thereof coincide with each other.
It is designed to be detachable. Roller 11 roller 1
Above the pole 21 supported by 6, a plurality of
The poles 21 are added along the center line CL of the box 3, and the plurality of added poles 21 form one upright column 22. In addition, each pole 21 has a scale 21c at predetermined intervals in the longitudinal direction of the pole 21.
Is engraved. A video input device 30 is provided on the upper end of the pole 21 that forms the upper end of the support column 22. As shown in FIG. 5, the video input device 30 has a cylindrical camera built-in case 31, and the camera built-in case 31 is erected on the upper end of the pole 21. A male screw 31a is formed so as to project from the lower surface of the camera built-in case 31, and the male screw 31a is formed on the pole 21 at the upper end of the column 22.
Is screwed into the female screw 21a. Case with built-in camera 31
Has a built-in CCD camera 32 with its objective lens 32a facing upward, and an upper end 31c of the camera built-in case 31 is open. A lower end opening 35a of a lens mounting tube 35 formed in a divergent shape toward the upper side is connected to an upper end opening 31c of the camera built-in case 31, and the lens mounting tube 35 has a fisheye lens 36.
However, the optical axis CT2 is made vertical, and the CCD camera 3
The second objective lens 32a is provided so as to match the optical axis CT2 and face upward. In addition, a transparent cap 37 formed of a transparent material and having a cylindrical shape having an opening 37a at the lower end is provided at the upper end opening 35b of the lens mounting cylinder 35.
Is connected in such a manner that its lower end opening 37a is aligned with the upper end opening 35b of the lens mounting cylinder 35, and the transparent cap 37 has its central axis aligned with the optical axis CL2 of the fisheye lens 36. Further, on the side surface 37b of the transparent cap 37, from the bottom, the first, second and third isoelevation lines 39 are formed.
a, 39b, 39c are respectively provided horizontally, and the first isoelevation angle line 39a is incident on the fisheye lens 36,
Among the light rays entering the CCD camera 32, the light rays that enter the fisheye lens 36 toward the center CP1 of the image input device 30 at an elevation angle of 5 degrees are provided around the height position where they intersect the side surface 37b of the transparent cap 37. The second isoelevation line 39b is incident on the fisheye lens 36, and among the light rays entering the CCD camera 32, the light ray incident on the fisheye lens 36 toward the center CP1 of the image input device 30 at the elevation angle of 10 degrees is of the transparent cap 37. The third equi-elevation line 39c is provided at a height position intersecting the side surface 37b, and the third equal elevation angle line 39c is incident on the fisheye lens 36 and enters the CCD camera 32.
The light rays that are incident on the fisheye lens 36 toward the center CP1 of the transparent cap 37 are provided at a height position where they intersect the side surface 37b of the transparent cap 37. A magnet plate 40 is provided at the center of the top plate 37c of the transparent cap 37.
As shown in FIG. 6, is composed of a transparent case 40b and a magnetic needle 40a in the case 40b.
A cable outlet 31b is formed on the lower side surface of the camera built-in case 31, and the cable 33 of the CCD camera 32 is drawn out of the camera built-in case 31 through the cable outlet 31b. The cable 33
1, has a length reaching the ground 70, and a small monitor 41 is connected to the end of the cable 33 on the ground 70 side.

Further, as shown in FIG. 8, the video input device 30 is provided at the upper end of the pole 21 forming the upper end of the support column 22.
Instead, the GPS antenna 25 can be connected, that is, the GPS antenna 25 has an auxiliary pole 25a connected to the lower surface thereof. A male screw 25b is provided at the lower end of the auxiliary pole 25a.
5b is formed in such a shape that it can be screwed into the female screw 21a of the pole 21 forming the upper end of the column 22. Also, GP
The length L2 from the center CP2 of the S antenna 25 to the lower end of the auxiliary pole 25a is the length L2 from the center CP1 of the video input device 30 shown in FIG.
Is formed equal to two. In addition, the GPS antenna 25
A receiver main body 27 installed on the ground 70 is connected to the via a sufficiently long cable 26.

Since the antenna installation height position selecting device 1 has the above-mentioned structure, as shown in FIG. 8, when the GPS antenna 25 is installed in a place with many shields such as the forest 50, first. Using the antenna installation height position selection device 1, a height position with good reception conditions is selected. That is, first, as shown in FIG. 1, the box 3 is first grounded with the tripod 2 so that the center line CL of the box 3 is oriented in the vertical direction and the installation point TP is positioned on the extension line of the center line CL.
Install on top of 0. As a result, the pole 21 is placed in the box 3
The tip of the pole 21 can be positioned on the center line CL when it is inserted into the insertion hole 3d and inserted into the box 3 so as to project from the feeding hole 3e. Therefore, the first pole 21 is inserted through the insertion hole 3d of the box 3. The pole 21 inserted from the insertion hole 3d is shown in FIG.
While being positioned on the center line CL of the box 3 by a plurality of sets of guide rollers 19 shown in FIG.
It is inserted vertically upward along with and is inserted between the roller 11 and the roller 16 as shown in FIG. Then, as shown in FIG.
The rotation of the rollers 1 and 16 makes it movable in the vertical direction on the center line CL, and the pole 21 moves the rollers 11 and 16 together.
And a plurality of sets of guide rollers 19, 19, the center line C
It is in a state of being held on L. Then, the handwheel 6 is rotated around the drive shaft axis CT in the direction of arrow C in the figure.
Then, the worm 7 also rotates in the arrow C direction via the drive shaft 5. Then, the worm wheel 9 meshing with the worm 7 rotates in the direction of arrow E around the axis of the rotary shaft 10 perpendicular to the drive shaft axis CT, as shown in FIG. 4, and the rotary shaft 10 rotates. . When the rotary shaft 10 rotates, the pole 21
The roller 11 that holds n is rotated. At this time, the large spur gear 12 fitted to the rotary shaft 10 also rotates in the direction of arrow E in the drawing, and the large spur gear 13 meshing with the large spur gear 12 moves in the direction of arrow G in the drawing, that is, the large spur gear. It rotates in the opposite direction to 12. Then, the rotary shaft 15 to which the large spur gear 13 is fitted rotates in the direction of the arrow G, and the roller 16 holding the pole 21 together with the roller 11 becomes
It rotates in the opposite direction to. As a result, the pole 21
As shown in FIG. 2, vertically above the center line CL, that is,
It moves in the direction of arrow A in the figure, and the upper portion of the pole 21 is fed out from the feeding hole 3e. At this time, as shown in FIG. 3, the pressing plate 20e of the spring-type stopper 20 attached to the feeding hole 3e is not in contact with the pole 21 and the pole 2
1, the spring type stopper 20 does not hinder the feeding. Next, as shown in FIG. 5, the video input device 30 is attached to the female screw 21 a formed on the upper end of the pole 21.
Male screw 3 provided on the lower surface of the camera built-in case 31
It is screwed by 1a. Then, the fish-eye lens 36 of the image input device 30 is set with its optical axis CT2 aligned with the center line CL and directed vertically upward. Then, the fish-eye lens 36 can capture the view above the image input device 30 with a visual field of 180 degrees centering on the box center line CL set vertically, that is, the vertical optical axis CT2. Then, the CCD camera 3 provided below the fisheye lens 36
2 can capture the scenery, so it was captured with a field of view of 180 degrees centering on this vertical optical axis CT2,
The view above the video input device 30 is displayed on the small monitor 41 shown in FIG. 1 via the cable 33. Also,
As shown in FIG. 5, a cylindrical transparent cap 37 made of a transparent material has a central axis at the upper end opening 35b of the lens mounting tube 35 having the fisheye lens 36 mounted, and the central axis thereof is the optical axis of the fisheye lens 36. It is provided so as to match CL2, and on the side surface 37b of the transparent cap 37, from the bottom, the first, second, and third isometric elevation lines 39a, 39b, 39c.
, Each of which is horizontally circumscribed, and has a first equal elevation line 3
9a is the center CP of the image input device 30 at an elevation angle of 5 degrees among the rays that enter the fisheye lens 36 and enter the CCD camera 32.
The light rays incident on the fisheye lens 36 toward 1 are provided at a height position intersecting the side surface 37b of the transparent cap 37, and the second equi-elevation angle line 39b is incident on the fisheye lens 36 and enters the CCD camera 32. Video input device 3 with an elevation angle of 10 degrees
A ray incident on the fisheye lens 36 toward the center CP1 of 0 is provided around a height position where it intersects the side surface 37b of the transparent cap 37, and a third isoelevation line 39c is incident on the fisheye lens 36 and enters the CCD camera 32. Among them, the light beam incident on the fisheye lens 36 toward the center CP1 of the image input device 30 at an elevation angle of 15 degrees is provided at a height position where it intersects with the side surface 37b of the transparent cap 37. Therefore, the CCD camera 32
The image above the video input device 30, which is input to the small monitor 41 as shown in FIG.
Third elevation lines 39a, 39b, 39c are displayed simultaneously. Then, the first, second and third elevation angles 39a, 3
9b and 39c, when the landscape above the video input device 30 is output to the small monitor 41, the elevation angle is 5 °, 10 °, 1 ° with respect to the center of the video input device 30 in the landscape.
You can know the position of 5 degrees. Therefore, when a shielding object such as the forest 50 appears in the scenery, the elevation angle α of the upper end of the shielding object can be known. Further, as shown in FIG. 6, a magnetic needle 40a in a transparent case 40b is provided at the center of the top plate 37c of the transparent cap 37. The magnetic needle 40a is also CC through the fisheye lens 36 of FIG.
Since it is taken by the D camera 32, the small monitor 41 of FIG.
In the view above the video input device 30 output to the
The direction can be displayed by 0a. Therefore, when a shielding object such as the forest 50 appears in the scenery, the direction in which the shielding object is located can be known.

Next, as shown in FIG.
While watching the view above the video input device 30 output to 1, the video input device 30 is moved upward to the position where the elevation angle α of the upper end of the shield such as the forest 50 becomes 15 degrees. That is,
On the male screw 21b formed at the lower end of the first pole 21,
Attach the second pole 21 to the female screw 21 at the upper end of the pole 21.
a is screwed together, rejoined so that the centers thereof coincide with each other, and the handwheel 6 is rotated in the direction of arrow C to rotate the roller 11 in the direction of arrow E and the roller 16 in the direction of arrow G. 21 and the upper portion of the second pole 21 connected to the pole 21 are vertically extended from the feeding hole 3e, that is, in the arrow A direction. Then, the image input device 30 moves to a higher place on the extension of the center line CL, that is, vertically above the installation point TP. Here, when the elevation angle α of the upper end of the shield such as the forest 50 in the landscape above the video input device 30 output to the small monitor 41 is 15 degrees or more, the lower end of the second pole 21 is further extended. , The third pole 21 is added as described above, and the handwheel handle 6 is again rotated in the direction of arrow C, and the upper portions of the second pole 21 and the third pole 21 are extended vertically upward, that is, in the direction of arrow A. , Move the image input device 30 to a higher place.
By repeating the work of replenishing by adding the pole 21 and rotating the hand-turning handle 6 in the direction of arrow C in this way, a forest 50 or the like in the landscape above the video input device 30 output to the small monitor 41 is displayed. The video input device 30 is moved upward to a position where the elevation angle α of the upper end of the shield becomes 15 degrees. Then, the video input device 30
Even if the GPS antenna 25 of FIG. 8 is installed at the position where the elevation angle α of the upper end of the shield such as the forest 50 is 15 degrees, the GPS antenna 25 can perform good reception. It can be moved and positioned at the height position. Next, at this time, the length L5 of the pole 21 inserted into the box 3 and protruding upward from the spring type stopper 20 is detected and recorded by reading the scale 21c engraved on the pole 21. Further, the number of poles 21 located above the poles 21 and having a predetermined length L3 is recorded. As a result, the support column 22 formed by adding the poles 21 can be restored in the same manner as described above, and the support column 22 can be fitted into the box 3 in the same manner as described above. The height from the ground 70 to the spring type stopper 20 is a predetermined height L.
4 and the length from the upper end of the uppermost pole 21 to the center CP1 of the image input device 30 is a predetermined length L2. Therefore, by adding these, the ground 70 to the center of the image input device 30 can be obtained. The height L6 up to CP1 can be detected. As a result, the height position L with good reception conditions
Six selections can be made.

Next, the GPS antenna 25 is installed at a height position where the receiving condition detected by the antenna installation height position selecting device 1 is good. That is, first, the video input device 30
In order to lower, the handwheel 6 is rotated in the direction of arrow D in FIG. Then, the roller 11 that sandwiches the support column 22 movably in the vertical direction on the center line CL rotates in the arrow F direction and the roller 16 rotates in the arrow H direction, so that the support column 22 is vertically downward, that is, the arrow B direction. Move to the stanchion 22
The pole 21 at the lowermost end is extended vertically downward from the insertion hole 3d of the box 3. Therefore, the bottom pole 21
Is removed from the column 22 by releasing the screwing. After the bottommost pole 21 is removed, as described above, the handwheel 6 is rotated in the direction of the arrow D, and the pole 21 at the next lowermost end of the column 22 is extended from the insertion hole 3d. Remove. In this way, the video input device 30 attached to the upper end of the support column 22 is lowered toward the box 3 while the support column 22 is disassembled. Then, if only one pole 21 to which the video input device 30 is attached is left in the box 3, as shown in FIG.
0 is removed and the GPS antenna 25 is attached instead. The GPS antenna 25 has an auxiliary pole 25a connected to the lower surface thereof, and a male screw 25b is provided at the lower end of the auxiliary pole 25a. Therefore, the GPS antenna 25 is attached in such a manner that the male screw 25b is screwed into the female screw 21a of the pole 21 forming the upper end of the support column 22. In addition, the length L2 from the center CP2 of the GPS antenna 25 to the lower end of the auxiliary pole 25a is measured from the center CP1 of the video input device 30 shown in FIG.
Is equal to the length L2 to the lower end of the. Then, as shown in FIG. 8, the pole 2 inserted into the box 3 is inserted.
While extending 1 upward, the same number of poles 21 as when the video input device 30 is extended is added, and the length of the last pole 21 protruding upward from the spring type stopper 20 is also the scale 21c engraved on the pole 21. , Scale 21c at the same position as when the height position L6 with good reception conditions is selected
To have the same length L5. And
As shown in FIG. 3, when the screw 20d of the spring-type stopper 20 provided around the feeding hole 3e is rotated and tightened toward the fixed block 20a, the pressing plate 20e pivotally supported at the tip of the screw 20d moves. With respect to the block 20c, move in the direction of the column 22, that is, in the direction of arrow J in FIG.
It contacts the side surface of the column 22. Therefore, when the screw 20d is further tightened to the movable block 20c toward the fixed block 20a, the movable block 20c moves in a direction away from the support column 22 and thus the fixed block 20a, that is, in the direction of arrow I. Then, the springs 20b, 20b extend and pull the moving block 20c in the direction of the column 22, that is, in the direction of the arrow J. Therefore, the pressing plate 20e connected to the moving block 20c via the screw 20d strongly pushes the column 22. Press. Then, the support column 22 is sandwiched between the semicircular concave surface of the fixed block 20a and the pressing plate 20e, and the support column 22 is positioned in the up-down direction with respect to the box 3, that is, in the positions of the arrows A and B in FIG. Fixed. This enables GPS
The antenna 25 can be installed at a height position where the receiving condition detected by the antenna installation height position selecting device 1 is good. Therefore, since the GPS antenna 25 is installed at a height that is higher than the shield by visual inspection as in the conventional case, whether the GPS antenna 25 is actually installed at a height position where reception conditions are good or not. However, the GPS antenna 25 is actually too low and is installed at a height position where reception conditions are poor.
The antenna 25 is never actually installed at a position higher than necessary.

Further, as described above, the transparent cap 37
Magnetic needle 40 in transparent case 40b on top plate 37c
With a, it is possible to know the direction in which the shield is located in the scene above the video input device 30 output to the small monitor 41. Therefore, when the video input device 30 is raised to a certain height, the video input device 30 By horizontally moving the device 30 together with the tripod 2 to a position where the elevation angle α of the shield is as small as possible, it is possible to select a low height position with good reception conditions selected by the antenna installation height position selection device 1. I can. Accordingly, when the GPS antenna 25 is installed at the height position so as to be supported by the support column 22, it is possible to prevent deterioration of the reception condition due to fluctuation of the support column 22 as much as possible. That is, it is possible to select a height position with better reception conditions.

In the above embodiment, each pole 21
The same scale 21c is provided on each
The video input device 30 is connected to the pole 21 which is located at the upper end of the poles 21 and the respective poles 21 are connected when the poles 21 are connected according to the order.
The scale 21c may be provided so as to indicate the distance from the center CP1 of the video input device 30.

[0013]

As described above, according to the first aspect of the present invention, the hand-held handle 6 and the worm having the support means such as the tripod 2 and the pole can be extended upward to the support means. 7, worm wheel 9, rollers 11, 1
6 or the like is provided, and a pillar, such as a pillar 22 formed by adding a plurality of additional poles, such as a pole 21 that is formed to be replenishable and detachable, is provided to the above-mentioned extending means so as to be vertically movable. Video input device 3 on top
A video input unit such as 0 is provided upward, and a video output unit such as a small monitor 41 that outputs a video input from the video input unit is connected to the video input unit, and the video input unit is transparent. A cap 37, first to third isometric elevation lines 39a,
The iso-elevation line indicating means 39b, 39c, etc. are replaced by the first to third iso-elevation lines 39a designated by the iso-elevation line indicating means.
The iso-elevation lines such as 39b and 39c are provided so as to be displayed on the image output to the image output unit, and the image input unit includes:
Since the azimuth indicating means such as the magnet board 40 is provided so that the azimuth indicated by the azimuth indicating means is displayed on the image output to the image output unit, there are many obstacles such as the forest 50. GPS such as GPS antenna 25 at location
When selecting the height position at which the antenna can be received, first, the feeding means is installed on the ground in a place where there are many shields by the supporting means. Then, the video input unit provided at the upper end of the support column can be moved and positioned in the vertical direction by operating the feeding means. Further, an image above the image input unit can be input from the image input unit, and the image can be output from the image output unit. Therefore, the image output unit can observe the shielding object in the image. Further, the video input unit is provided with the iso-elevation line instruction means in a form in which the iso-elevation line instructed by the iso-elevation angle instruction unit is displayed on the video output to the video output unit. Therefore, the iso-elevation line instructed by the iso-elevation line instruction means is displayed on the video on the video output to the video output unit. Therefore, in the image, it is possible to know the elevation angle such as the elevation angle α of the upper end of the shield with respect to the image input unit. Therefore, the elevation angle of the upper end of the shield with respect to the image input unit is G at the height position where the image input unit is located, instead of the image input unit.
When a PS antenna is installed, the feeding means is operated to move and position the video input unit in the vertical direction so as to obtain a predetermined elevation angle with which good reception conditions can be obtained. A good height position can be selected. Therefore, as in the past, the GPS antenna was installed at a height position that was higher than the shield by visual inspection, so whether the GPS antenna was actually installed at a height position where reception conditions were good was confirmed. It cannot be grasped, and the GPS antenna is actually installed at a height position where reception conditions are poor due to being too low, or conversely, the GPS antenna is actually installed at a position higher than necessary. The inconvenience of can be solved. Further, since the azimuth indicating means is provided in the video input section so that the azimuth instructed by the azimuth indicating means is displayed on the video output to the video output section. The azimuth instructed by the azimuth instructing means is displayed on the video output unit. Therefore, since the azimuth in which the shield is located can be known, when the image input unit is raised to a certain height, the image input unit, together with the supporting unit, is positioned at a position where the elevation angle of the shield is as small as possible. By horizontally moving to the lower position, it is possible to select a lower height position with good reception conditions selected by the antenna installation height position selecting device of the present invention. Thus, when the GPS antenna is installed at the height position so as to be supported by the supporting means such as the support column 22, it is possible to prevent deterioration of the reception condition due to the supporting means swinging due to its height. That is, it is possible to select a height position with better reception conditions. A second aspect of the present invention is the first aspect of the invention, which is configured by providing height display means such as a scale 21c on the column, so that the selected height position is provided on the column. Since it can be easily known by the height display means, it is possible to quickly and easily install the GPS antenna at the selected height position.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an antenna installation height position selecting device of the present invention.

2 is a view showing a pole feeding mechanism of the antenna installation height position selecting device of FIG.

FIG. 3 is a sectional view taken along the line I and I of FIG.

FIG. 4 is a sectional view taken along the line II and II in FIG.

5 is an enlarged front view showing the video input device of FIG. 1. FIG.

FIG. 6 is a plan view showing the video input device of FIG.

FIG. 7 is a diagram showing a small monitor outputting an image input from the image input device of FIG.

8 is a diagram in which a video input device of the antenna installation height position selecting device of FIG. 1 is removed and a GPS antenna is provided instead.

[Explanation of symbols]

2 ... Supporting means (tripod) 6 ... Feeding means (handwheel) 7 ... Feeding means (worm) 9 ... Feeding means (worm wheel) 11 ... Feeding means (roller) 16 ... Feeding means (roller) 21 ... Replenishing pole (pole) 21c ... Height display means (scale) 22 ... Support (support) 30 ... Image input unit (video input device) 37 ... Elevated angle line indicating means (transparent cap) 39a- 39c ... Equal elevation angle indicating means (first to third equal elevation angles) 40 ... Direction indicating means (magnet board) 41 ... Image output unit (small monitor)

Claims (2)

[Claims] 1. A support means, wherein the support means is provided with a payout means capable of paying out a pole upward, and the payout means is formed by adding a plurality of add-on poles that are added and detachable. And a video input unit is provided at an upper end of the support column so that the video input unit is connected to a video output unit that outputs a video input from the video input unit. The image input unit is provided with an iso-elevation line instruction means in a form in which the iso-elevation line instructed by the iso-elevation line instruction unit is displayed on the image output to the image output unit, and the image input unit, An antenna installation height position selecting device configured by providing azimuth indicating means so that the azimuth indicated by the azimuth indicating means is displayed on an image output to the image output unit. 2. An antenna installation height position selecting device according to claim 1, wherein height display means is provided on the support column.