JP5957101B2 - Geostationary satellite position detection device, portable terminal device, and program - Google Patents

Description

  The present invention relates to a geostationary satellite position detection device, a portable terminal device, and a program for detecting the position of a geostationary satellite placed in a geosynchronous orbit over the equator.

  Many geostationary satellites are connected in geostationary orbit called Clark belt at 36,000km above the equator. There is a parabolic antenna installation method called the polar mount method in order to sequentially receive radio waves from these geostationary satellites running from the west to the east of the observation point. In the polar mount system, the rotation axis of the parabolic antenna is made parallel to the ground axis to track the communication satellite on the Clark belt.

  Since the position of a geostationary satellite is called by the longitude on the equator directly below the geostationary satellite, when the parabolic antenna is installed, the position of the geostationary satellite must be accurately detected at the installation point. Conventionally, as an apparatus for detecting the position of a geostationary satellite, an azimuth indicating apparatus described in Patent Document 1 is known.

  Patent Document 1 discloses a position information input unit that inputs position information of a measurement point, and a direction in which the direction of the sun is detected by detecting light from the sun, which is an object whose relative position to the measurement point is known. Based on the detection means, the sun direction detected by the direction detection means and the position information of the measurement point, the sun direction is calculated, and the true north direction is calculated based on the sun direction calculated by the calculation means. Instruction means for instructing.

  With this configuration, the device described in Patent Document 1 can always know the exact true north even in a place where the geomagnetism is affected. Therefore, it becomes possible to accurately indicate the azimuth of the geostationary satellite with reference to this true north. ing.

Japanese Patent Laid-Open No. 08-247759

  However, in the thing of patent document 1, there existed a subject that a complicated operation repeated.

  Specifically, in the case of the one described in Patent Document 1, the position of a series of geostationary satellites connected in geostationary orbit is obtained, or the radio waves from geostationary satellites are received while avoiding the influence of surrounding structures. In other words, it was necessary to repeat the work of obtaining the position information of the measurement point and the work of calculating the direction of the sun. Therefore, there has been a demand for a device that allows a user to accurately and intuitively recognize the position of a geostationary satellite with a simple configuration.

  The present invention has been made in view of the circumstances as described above, and a geostationary satellite position detecting device, a portable terminal device, and a mobile terminal device capable of allowing a user to accurately and intuitively recognize the position of a geostationary satellite with a simple configuration. The purpose is to provide a program.

  The geostationary satellite position detection apparatus of the present invention detects an observation point satellite azimuth and an observation point satellite elevation angle that respectively indicate the azimuth and elevation angle of the geostationary satellite at an observation point that observes the geostationary satellite arranged in a geosynchronous orbit above the equator. A satellite position detecting device having a semicircular outer periphery, and the direction from the first angle center point serving as a reference for angle measurement toward the apex of the semicircular outer periphery is true north and true south. Angle measurement with a first protractor arranged in a direction toward either one and indicating the observation point satellite orientation, and a semi-elliptical outer periphery having a point corresponding to the longitude of the observation point as a vertex A second protractor for indicating the azimuth of the geostationary satellite at the equator, the direction from the second central point of the angle to the apex of the semi-elliptical outer peripheral portion is disposed in the direction toward the one side, The first and second An azimuth reading line for rotating the angle center point as a rotation center and reading the azimuth indicated by the first and second protractors, and the observation point satellite elevation angle with zero as the rotation center along the azimuth reading line. An azimuth reading slide having an elevation graduation, and an elevation curve drawn based on the observation point satellite azimuth and the observation point satellite elevation obtained in advance by calculation, wherein the azimuth reading line is the first reading line Elevation angle having an elevation angle curve drawn so that the distance from the rotation center along the azimuth reading line corresponds to the observation point satellite elevation angle of the stationary satellite in the predetermined azimuth when aligned with the predetermined azimuth of the protractor And when the azimuth on the equator of the predetermined geostationary satellite is set in the second protractor by the azimuth reading line, the observation satellite position of the predetermined geostationary satellite is Shown in the first protractor by azimuth reading line has a configuration in which observation point satellite elevation angle of the predetermined geostationary satellite is indicated by the elevation angle scale as the intersection of the elevation angle curve and the azimuth reading line.

  The present invention can provide a geostationary satellite position detection device, a portable terminal device, and a program having an effect of allowing a user to accurately and intuitively recognize the position of a geostationary satellite with a simple configuration. .

1 is an external view of a geostationary satellite position detection device according to a first embodiment of the present invention. It is an external view of the handle in 1st Embodiment of this invention. It is an external view of the observation locality indicating board in 1st Embodiment of this invention. It is a figure for demonstrating the production method of the satellite direction indicator board in 1st Embodiment of this invention. It is an external view of the satellite direction indicator board in 1st Embodiment of this invention. It is an external view of the elevation curve display board in 1st Embodiment of this invention. It is explanatory drawing for drawing the elevation curve in 1st Embodiment of this invention. It is an external view of the azimuth | direction reading slide in 1st Embodiment of this invention. It is a block block diagram of the portable terminal device in 2nd Embodiment of this invention. It is a figure which shows the example of a display of the stationary satellite position detection image which the portable terminal device in 2nd Embodiment of this invention displays.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, the configuration of the geostationary satellite position detection apparatus according to the first embodiment of the present invention will be described.

  In the following explanation, the observation point for observing geostationary satellites is assumed to be in Japan. In addition, the azimuth and elevation angle of the geostationary satellite at the observation point are referred to as the observation point satellite azimuth and the observation point satellite elevation angle, respectively. In addition, the observation point satellite orientation is generally expressed as an orientation based on true north, with true north as 0 °, true east as 90 °, true south as 180 °, true west as 270 °. In the form, in order to make it easy for the user to intuitively recognize, the true west is 0 °, the true south is 90 °, the true east is 180 °, the true north is 270 °, and the orientation is expressed with reference to the true west.

  As shown in FIG. 1, the geostationary satellite position detection apparatus 1 according to the present embodiment includes a handle 10, an observation local position instruction board 20, a satellite orientation instruction board 30, an elevation curve display board 40, an orientation reading slide 50, and an orientation magnet 14. The fixing part 15 is provided.

  In the example shown in the figure, an observation locality indicating board 20, a satellite direction indicating board 30, an elevation curve display board 40, and an orientation reading slide 50 are sequentially stacked on the upper surface of the handle 10, and these are fixed to each other by the fixing unit 15. ing. However, each component is not completely fixed, but is preferably fixed to the extent that it can be rotated about the fixing portion 15 as a rotation center. Hereinafter, each component will be described with reference to FIGS.

  First, the handle 10 will be described. As shown in FIG. 2, the handle 10 includes a main body 11 formed in an elongated rectangular plate shape, a reference line 12 drawn along the longitudinal direction of the main body 11, and a predetermined position on the reference line 12. A through hole 13 is formed and a fixing portion 15 (see FIG. 1) is inserted, and a compass magnet 14 fixed on the surface of the main body 11.

  The compass magnet 14 includes a central axis 14a, a magnetic needle 14b supported so as to be rotatable about the central axis 14a, a dial 14c, and a magnetic north mark 14d for directing the magnetic needle 14b toward magnetic north. Further, the azimuth magnet 14 is fixed to the handle 10 so that the center axis 14 a is positioned on the reference line 12 of the handle 10 and the north-south direction displayed on the dial 14 c coincides with the reference line 12. The compass 14 and the magnetic north mark 14d are examples of direction detecting means.

  The magnetic north mark 14d is a mark for correcting a declination angle (west west angle or east east angle) at an observation point. As shown in the figure, in the state where the north pole of the magnetic needle 14b points to the magnetic north mark 14d, the angle α formed by the reference line 12 of the handle 10 and the direction in which the magnetic needle 14b is directed corresponds to the declination. In FIG. 2, the angle α corresponds to the west angle.

  Next, the observation locality indicating board 20 will be described. As shown in FIG. 3, the observation locality indicating board 20 has a semicircular outer peripheral portion 21 and a through hole 23, and the semicircular outer peripheral portion from the angle center point 22 which is a reference for angle measurement. The direction toward the vertex 24 of 21 is arranged in a direction toward true south (true north in the southern hemisphere). This observation location indicator 20 can be used regardless of the latitude and longitude of the observation site. Note that the observation locality instruction board 20 is an example of a first protractor, and may be configured with, for example, a commercially available protractor. Moreover, the shape of the observation locality indicating board 20 is not limited to a semicircular shape, and may be a circular shape, for example.

  The semicircular outer peripheral portion 21 is provided with an angle scale with a minimum angle of 0.5 °. Along the angle scale, a west reference azimuth scale number 25 based on true west and an east reference azimuth scale number 26 based on true east are described. For example, the satellite reference setting target parabolic antenna can adopt the west reference azimuth scale number 25 when the satellite is oriented in the initial state, and can adopt the east reference azimuth scale number 26 when the parabolic antenna faces the east. . For example, when the west reference orientation scale number 25 is used, 0 ° indicates true west, 90 ° indicates true south, and 180 ° indicates true east.

  The through hole 23 is formed with the angle center point 22 as a center, and the fixing portion 15 (see FIG. 1) is inserted therein.

  Next, the satellite direction indicating board 30 will be described. The satellite direction indicating board 30 is formed based on the shape of the equator plane projected onto the observation point plane including the observation point and the earth center according to the latitude of the observation point, and will be described with reference to FIG.

  As shown in FIG. 4, the observation point plane that is the tangent plane between the earth and the observation point is in contact with the earth at one point of the observation point. Assuming that the plane that appears when the earth is cut along the equator is the equator plane, the angle formed by the observation point plane and the equator plane is (90 ° −observation point latitude).

  On the other hand, the azimuth of a geostationary satellite linked to a geostationary orbit above the equator is called the longitude just below the satellite, so it is equal to the angle when a protractor is applied to the equator plane. Since the equatorial plane including the azimuth angle of the geostationary satellite is inclined by (90 ° -observation point latitude) with respect to the observation point plane, the equator plane is projected onto the observation point plane at COS (90 ° -observation point latitude). . Therefore, if the length corresponding to the observation point is reduced by COS (90 ° −observation point latitude), a semi-elliptical shape 36 is obtained. The satellite direction indicating board 30 is formed based on a shape similar to the semi-elliptical shape 36.

  Specifically, as shown in FIG. 5, the satellite direction indicating board 30 includes a semi-elliptical outer peripheral portion 31 having a point corresponding to the longitude of the observation point as a vertex 34, a through hole 33, and a west reference direction scale. And the direction from the angle center point 32 serving as a reference for angle measurement toward the apex 34 of the outer periphery of the semi-elliptical shape is arranged in a direction toward true south (true north in the southern hemisphere), and is stationary at the equator. It shows the direction of the satellite. The satellite direction indicating board 30 is an example of a second protractor, and can be easily manufactured using, for example, a personal computer.

  The semi-elliptical outer peripheral portion 31 is provided with an angle scale with a minimum angle of 0.5 °. For example, when the longitude of the observation point is 130 ° east longitude, the apex 34 becomes a scale of 130 ° and is pointed to the south at the time of geostationary satellite observation, and the 40 ° scale rotated 90 ° clockwise is the true west. The 220 ° scale, which is turned 90 ° counterclockwise, points to the east.

  The through-hole 33 is formed around the angle center point 32, and the fixing portion 15 (see FIG. 1) is inserted therein.

  Next, the elevation curve display board 40 will be described. As shown in FIG. 6 (a), the elevation angle curve display board 40 includes an elevation angle curve 41 drawn based on the observation point satellite azimuth and observation point satellite elevation angle obtained in advance, and the observation locality indication board 20 ( Azimuth line 42 corresponding to the azimuth shown in FIG. 3, azimuth line center point 43 of azimuth line 42, and through hole 44.

  The through-hole 44 is formed around the azimuth center point 43, and the fixing portion 15 (see FIG. 1) is inserted therein.

  A method for creating the elevation curve 41 will be described with reference to FIG. Fig. 7 shows that the observation point is 33.88 ° north latitude and 130.87 ° east longitude, the names of some geostationary satellites that can be observed at the observation point, the location of the geostationary satellites, and the true north reference observation point satellite orientation. And the observation point satellite orientation of the true west reference and the observation point satellite elevation angle.

  The position of the geostationary satellite is indicated by the longitude (east longitude in the case of FIG. 7) on the equator immediately below the geostationary satellite. The true north reference observation point azimuth is data obtained by using a known calculation formula to determine the position of a geostationary satellite as the azimuth at the observation point based on a commonly used true north reference. The true west reference observation point satellite direction is data obtained by converting the true north reference observation point satellite direction into the true west reference. For example, since a geostationary satellite with a satellite position of 166 ° east has a true north reference observation point satellite orientation of 128.4 °, the true western reference observation point satellite orientation = 270 ° -128.4 ° = 141.6. ° is obtained. The observation point satellite elevation angle is an elevation angle obtained by a known calculation formula. In this embodiment, since the azimuth of the geostationary satellite is observed with the true west reference, the observation point azimuth and observation point elevation angle with the west reference are used.

  For each geostationary satellite shown in FIG. 7, the elevation angle curve 41 is drawn as shown below using the data of the observation point azimuth and observation point elevation angle based on the true west. In this description, “observation direction of the west reference point” is simply referred to as “direction”, and “observation point elevation angle” is simply referred to as “elevation angle”.

  For example, as shown in FIG. 6B, the azimuth in the elevation angle curve 41 is represented by an angle β with the azimuth line center point 43 as a reference, and the elevation angle is a distance L (unit: mm) from the azimuth line center point 43. Represent. Since the angle β is based on the azimuth line center point 43, it is equal to the azimuth indicated by the observation local position indicating board 20 (see FIG. 3).

  Since the geostationary satellite with the satellite position = 55 ° east has azimuth = 8.0 ° and elevation angle = 3.0 °, a point 61 determined by β = 8.0 ° and L = 3.0 mm is plotted.

  Since the geostationary satellite with the satellite position = 83 ° east has azimuth = 26.8 ° and elevation angle = 26.0 °, the point 62 determined by β = 26.8 ° and L = 26.0 mm is plotted.

  Since the geostationary satellite with the satellite position = 105 ° east has an azimuth = 49.0 ° and an elevation angle = 41.9 °, a point 63 determined by β = 49.0 ° and L = 41.9 mm is plotted.

  Since the geostationary satellite with satellite position = 128 ° east has azimuth = 84.9 ° and elevation angle = 50.5 °, a point 64 determined by β = 84.9 ° and L = 50.5 mm is plotted.

  Since the geostationary satellite with the satellite position = 166 ° east has azimuth = 141.6 ° and elevation angle = 35.7 °, a point 65 determined by β = 141.6 ° and L = 35.7 mm is plotted.

  Similarly, for each geostationary satellite whose description is omitted in FIG. 7, points determined by the azimuth and the elevation angle are plotted, and by connecting the plotted points, the elevation curve 41 shown in FIG. 6A is obtained. The elevation angle curve 41 can be easily obtained by causing the personal computer to execute the above-described procedure.

  Next, the orientation reading slide 50 will be described. As shown in FIG. 8, the azimuth reading slide 50 includes a slide main body 51 formed of a transparent material, an azimuth reading line 52 drawn at the center in the width direction along the longitudinal direction of the slide main body 51, and an azimuth direction. An elevation angle scale 53 with a scale along the reading line 52 and a through hole 54 formed at a predetermined position on the azimuth reading line 52 and into which the fixing portion 15 (see FIG. 1) is inserted. .

  The slide body 51 is centered on the center point 55 of the through hole 54, that is, the angle center point 22 (see FIG. 3) of the observation local position indicating board 20 and the angle center point 32 (see FIG. 5) of the satellite orientation indicating board 30. Rotate around the center.

  The azimuth reading line 52 is for reading the azimuth indicated by the observation locality instruction board 20 and the satellite azimuth instruction board 30.

  The elevation angle scale 53 is for reading the elevation angle indicated by the intersection of the azimuth reading line 52 and the elevation angle curve 41, and the center point 55 of the through hole 54 is set at an elevation angle = 0 °. In this embodiment, the scale of the elevation scale 53 is given in units of millimeters (mm).

  Next, a procedure for detecting the position of a geostationary satellite using the geostationary satellite position detection apparatus 1 in the present embodiment will be described. In this description, the observation point is assumed to be 33.88 ° north latitude and 130.87 ° east longitude. The geostationary satellite to be observed is the satellite position = 166 ° east longitude (see FIG. 7).

  First, the azimuth reading line 52 of the azimuth reading slide 50 is aligned with the 166 ° scale position of the satellite azimuth indicating board 30. Next, the angle scale of the observation locality indicating board 20 indicated by the azimuth reading line 52 is read. As a result, the observation point satellite orientation of 141.6 ° is obtained. Further, when the intersection of the azimuth reading line 52 and the elevation curve 41 is read by the elevation scale 53, 35.7 ° is obtained as the observation point satellite elevation angle.

  In this state, the handle 10 is held in the hand so that the back surface of the handle 10 is parallel to the ground, and the direction is confirmed by the direction magnet 14. Next, the handle 10 is rotated in the horizontal direction so that the north pole of the magnetic needle 14b of the azimuth magnet 14 points to the magnetic north mark 14d. As a result, the length direction of the reference line 12 of the handle 10 is correctly directed to the south direction, and the direction of the azimuth reading slide 50 correctly indicates the direction of the geostationary satellite with satellite position = 166 ° east longitude. .

  The observation point satellite elevation angle obtained as described above can be confirmed by the angle formed by the axis where the parabolic antenna faces the geostationary satellite and the vertical line where the weight is suspended.

  As described above, the geostationary satellite position detection apparatus 1 according to the present embodiment includes the observation local position instruction board 20, the satellite direction instruction board 30, the elevation curve display board 40, the direction reading slide 50, the handle 10, It has. With this configuration, the geostationary satellite position detection device 1 according to the present embodiment matches the azimuth of the stationary satellite to be observed with the satellite azimuth instruction board 30 by the azimuth reading line 52 of the azimuth reading slide 50, thereby Thus, the observation point satellite orientation of the geostationary satellite to be observed can be easily obtained, and the observation point satellite elevation angle can be easily obtained by the elevation angle curve display board 40. Furthermore, by pointing the handle 10 toward the south in this state, it is possible to easily grasp the direction of the stationary satellite to be observed from the direction in which the direction reading slide 50 is facing.

  Therefore, the geostationary satellite position detection apparatus 1 in the present embodiment can make the user recognize the position of the geostationary satellite accurately and intuitively with a simple configuration.

  In addition, the geostationary satellite position detection device 1 in the present embodiment does not require electric power in the position calculation of the geostationary satellite and is not affected by temperature, humidity, or the like, compared to a detection device using a general electronic device. It can also be used in a poor environment in an emergency or in a place where power supply is difficult.

  In addition, the geostationary satellite position detection apparatus 1 according to the present embodiment can easily identify a geostationary satellite that is viewed from a valley of a high-rise building in an urban area, for example, and can easily perform satellite broadcast reception settings.

(Second Embodiment)
Next, the portable terminal device in 2nd Embodiment is demonstrated using FIG. FIG. 9 is a block configuration diagram of the mobile terminal device 70 in the present embodiment.

  As shown in FIG. 9, the mobile terminal device 70 in this embodiment includes an input unit 71, a GPS 72, a gyro compass 73, a touch panel 74, and a control unit 80.

  The control unit 80 includes a true north detection unit 81, a geostationary satellite information storage unit 82, an image generation unit 83, an image display control unit 84, and a program storage unit 85. The control unit 80 is constituted by a computer, for example, and is constituted by a CPU, a ROM, a RAM, an input / output interface and the like.

  The input unit 71 is operated by a user to input declination information of observation points, an azimuth reference method such as whether the azimuth display is the west reference direction or the east reference. The GPS 72 acquires information on the latitude and longitude of the observation point. The gyrocompass 73 detects magnetic north.

  The true north detection unit 81 detects true south or true north based on the declination information input by the input unit 71 and the magnetic north information detected by the gyrocompass 73. The gyro compass 73 and the true north detection unit 81 are an example of a true north direction detection unit.

  The geostationary satellite information storage unit 82 stores longitude information immediately below the equator of all geostationary satellites.

  Based on the azimuth reference information input by the input unit 71 and the latitude and longitude information acquired by the GPS 72, the image generation unit 83 uses the observation local position instruction board 20 and the satellite azimuth direction described in the first embodiment. Each image of the board 30, the elevation curve display board 40 and the azimuth reading slide 50 (hereinafter referred to as “stationary satellite position detection image”) is generated. The image generation unit 83 generates a cursor image indicating true south (true north in the southern hemisphere) based on true north information detected by the true north detection unit 81.

  The image display control unit 84 performs control for displaying the stationary satellite position detection image and the cursor image generated by the image generation unit 83 on the touch panel 74.

  The touch panel 74 displays a geostationary satellite position detection image and a cursor image, and detects a user's touch operation. The touch panel 74 is an example of a display unit.

  The touch panel 74 outputs operation information to the image generation unit 83 particularly when the user slides and rotates the image of the orientation reading slide 50 with a finger. In this case, the image generation unit 83 performs a process of rotating the image of the azimuth reading slide 50 around the center point 55 (see FIG. 8) of the azimuth reading slide 50 in accordance with the slide operation. The image data is output to the image display control unit 84. That is, the image generation unit 83 is an example of a slide image rotation unit.

  The program storage unit 85 generates a geostationary satellite position detection image, displays the geostationary satellite position detection image on the touch panel 74, rotates the image of the orientation reading slide 50 according to the user's slide operation, Alternatively, a program for executing processing for detecting true north, processing for generating a cursor image directed to true south, and data necessary for each processing are stored.

  FIG. 10 is a table in which the mobile terminal device 70 according to the present embodiment displays a stationary satellite position detection image 91, a cursor image 92 pointing to the south, and a reference line 93 of the stationary satellite position detection image on the touch panel 74. An example is shown. In addition, although the image of each component is displayed on the touch panel 74, the same reference numerals as those of the components in the first embodiment are given for convenience.

  For example, the user slides his / her finger on the image of the azimuth reading slide 50 to bring the image of the azimuth reading slide 50 around the center point 55 (see FIG. 8) of the azimuth reading slide 50. By rotating and aligning the azimuth reading line 52 of the azimuth reading slide 50 with the scale of the satellite azimuth indicating board 30 so as to be in the desired geostationary satellite azimuth, the scale of the observation local position indicating board 20 indicated by the azimuth reading line 52 is read. The desired geostationary observation point satellite orientation can be obtained. In this state, if the intersection of the azimuth reading line 52 and the elevation curve drawn on the elevation curve display board 40 is read by the elevation scale of the azimuth reading slide 50, the observation point satellite elevation angle is obtained.

  Further, the user rotates the mobile terminal device 70 in the horizontal direction so that the cursor image 92 coincides with the reference line 93 of the stationary satellite position detection image, so that the desired stationary satellite in the direction indicated by the image of the azimuth reading slide 50. You can easily grasp that there is.

  As described above, the mobile terminal device 70 according to the present embodiment allows the user to accurately and intuitively recognize the position of the geostationary satellite with a simple configuration, similar to the geostationary satellite position detection device 1 of the first embodiment. Can do.

  As described above, the geostationary satellite position detection device, the mobile terminal device, and the program according to the present invention have an effect that the position of the geostationary satellite can be accurately and intuitively recognized by the user with a simple configuration. This is useful as a geostationary satellite position detection device, a portable terminal device, and a program for detecting the position of a geostationary satellite placed in a geostationary orbit over the equator.

1 geostationary satellite position detector 10 handle 12 reference line 14 azimuth magnet (direction detection means)
14d magnetic north mark (direction detection means)
20 Observation location indicator board (first protractor)
21 Peripheral part 22 Angle center point 24 Vertex 30 Satellite direction indicator board (second protractor)
31 Peripheral part 32 Angle center point 34 Vertex 40 Elevation curve display board 41 Elevation curve 50 Azimuth reading slide 52 Azimuth reading line 53 Elevation scale 55 Center point 70 Mobile terminal device 71 Input unit 72 GPS
73 Gyro compass (true north direction detection means)
74 Touch panel (display means)
80 Control unit (computer)
81 True north detection unit (true north direction detection means)
82 Geostationary satellite information storage unit 83 Image generation unit (slide image rotation means)
85 Program storage

Claims (5)

A geostationary satellite position detecting device for detecting an observation point satellite azimuth and an observation point satellite elevation angle indicating an azimuth and an elevation angle of the geostationary satellite at an observation point observing a geostationary satellite arranged in a geosynchronous orbit above the equator,
It has a semicircular outer periphery, and the direction from the first angle center point, which is a reference for angle measurement, to the apex of the semicircular outer periphery is arranged in a direction toward either true north or true south A first protractor for indicating the observation point satellite orientation;
A semi-elliptical outer periphery having a point corresponding to the longitude of the observation point as a vertex, and a direction from a second angle center point serving as a reference for angle measurement toward the vertex of the semi-elliptical outer periphery is A second protractor arranged in one direction to indicate the bearing of the geostationary satellite at the equator;
Rotating around the first and second angular center points as a rotation center, an azimuth reading line for reading the azimuth indicated by the first and second protractors, and the rotation center along the azimuth reading line An azimuth reading slide having an elevation scale indicating zero as the observation point satellite elevation angle, and
An elevation curve drawn based on the observation point satellite azimuth and the observation point satellite elevation obtained in advance, and when the azimuth read line is aligned with a predetermined azimuth of the first protractor, An elevation curve display board having an elevation curve drawn so that the distance from the rotation center along the azimuth reading line corresponds to the observation point satellite elevation angle of the stationary satellite in the predetermined orientation;
With
When the azimuth on the equator of a predetermined geostationary satellite is set in the second protractor by the azimuth reading line, the observation point satellite azimuth of the predetermined geostationary satellite is indicated in the first protractor by the azimuth reading line. An observation point satellite elevation angle of the predetermined geostationary satellite is indicated by the elevation angle scale as an intersection of the azimuth reading line and the elevation angle curve.   When the latitude of the observation point is represented by θ °, the second protractor is a semicircular arc whose apex is the observation point obtained by rotating the equator plane by θ ° with respect to an axis passing through the earth center, 2. The geostationary satellite position detecting device according to claim 1, which is a protractor similar to a shape obtained by reducing the center line of the semicircular arc by a ratio corresponding to COS (90 ° −θ °).   The geostationary satellite position detection device according to claim 1, further comprising a direction detection unit that detects a direction toward either one of the true north and the true south. Computer for realizing a geostationary satellite position detecting device for detecting an observation point satellite azimuth and an observation point satellite elevation angle indicating an azimuth and elevation angle of the geostationary satellite at an observation point observing a geostationary satellite placed in a geosynchronous orbit over the equator An executable program, wherein the program
It has a semicircular outer periphery, and the direction from the first angle center point, which is a reference for angle measurement, to the apex of the semicircular outer periphery is arranged in a direction toward either true north or true south A first protractor for indicating the observation point satellite orientation;
A semi-elliptical outer periphery having a point corresponding to the longitude of the observation point as a vertex, and a direction from a second angle center point serving as a reference for angle measurement toward the vertex of the semi-elliptical outer periphery is A second protractor, arranged in one direction, to indicate the orientation of the geostationary satellite at the equator,
Rotating around the first and second angular center points as a rotation center, an azimuth reading line for reading the azimuth indicated by the first and second protractors, and the rotation center along the azimuth reading line An azimuth reading slide having an elevation scale indicating zero as the observation point satellite elevation angle, and
An elevation curve drawn based on the observation point satellite azimuth and the observation point satellite elevation obtained in advance, and when the azimuth read line is aligned with a predetermined azimuth of the first protractor, An elevation curve display board having an elevation curve drawn so that the distance from the rotation center along the azimuth reading line corresponds to the observation point satellite elevation angle of the stationary satellite in the predetermined orientation;
As a program to function as
When the azimuth on the equator of a predetermined geostationary satellite is set in the second protractor by the azimuth reading line, the observation point satellite azimuth of the predetermined geostationary satellite is indicated in the first protractor by the azimuth reading line. An observation point satellite elevation angle of the predetermined geostationary satellite is indicated by the elevation angle scale as an intersection of the azimuth reading line and the elevation curve. A program storage unit storing the program according to claim 4;
A computer for executing the program stored in the program storage unit;
A true north direction detecting means for detecting the true north direction;
Display means for displaying each image of the first and second protractors, the slide and the elevation curve display board;
Slide image rotation means for rotating the image of the slide with reference to the rotation center;
A portable terminal device comprising:

Images