JP2006258501A - Antenna forecast value generation program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna forecast value generation program for allowing a computer to generate an antenna forecast value for a tracking device not generating useless reverse rotation. <P>SOLUTION: This program has a determination step for determining whether an azimuth existence range shown by the antenna forecast value supplied to a computer 10 generating the antenna forecast value for the tracking device 20 capable of controlling an azimuth by positive rotation or negative rotation is within a driving restriction of the tracking device 20 or not, and a conversion step for converting the azimuth existence range within the driving restriction in an azimuth existence range shown by the antenna forecast into an azimuth angle of reverse rotation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an antenna forecast value creation program, and more particularly to an antenna forecast value creation program that causes a computer to create an antenna forecast value for a tracking device.

  A so-called tracking device is used in a tracking facility for tracking a spacecraft such as an artificial satellite or space debris with an antenna or a radar. In the tracking facility, an antenna prediction value indicating which direction of the tracking device is directed from the predicted trajectory of the spacecraft is generated, and the tracking device is driven according to the antenna prediction value.

Usually, the antenna forecast value is series data in which time, azimuth and elevation are set. The azimuth angle is created in a range of 360 deg, such as 0 to 360 deg (degrees) and -180 to +180 deg. Patent Document 1 discloses a radar system that tracks a space navigation body such as a spacecraft.
JP 2000-9835 A

  2. Description of the Related Art In recent years, there are tracking devices that are used for tracking a space vehicle, in which driving restrictions such as −270 to +270 deg are set for the azimuth angle. FIG. 1 is an image diagram illustrating an example of driving limitation of the tracking device. In the image diagram of FIG. 1, the north is 0 deg, the west is 90 deg, the south is 180 deg, and the east is 270 deg. In the image diagram of FIG. 1, counterclockwise rotation is defined as + (positive) rotation, and clockwise rotation is defined as-(negative) rotation. 1 can drive from azimuth angle 0 deg to +270 deg with + rotation and from azimuth angle 0 deg to −270 deg with −rotation. In the tracking device in which the drive limitation as shown in FIG. 1 is set, the following problem occurs when the tracking device is driven with the antenna forecast value of the azimuth angle 0 to 360 deg.

  FIG. 2 is an image diagram showing the relationship between the antenna forecast value defined by the azimuth angle 0 to 360 deg and the drive limit −270 to +270 deg. The image diagram of FIG. 2 represents the azimuth angle change of the tracking device with respect to time. Moreover, the solid line in FIG. 2 represents the antenna forecast value prescribed | regulated by 0-360deg. The dotted line in FIG. 2 represents the antenna forecast value equivalent to the solid line.

  In general, a space vehicle such as space debris may be considered such that the change in azimuth angle during one visible period does not exceed 180 deg. Therefore, the image diagram of FIG. 2 represents an example in which the azimuth angle change during one visible period is 180 degrees or less.

  In FIG. 2A, the azimuth angle at the start of spacecraft supplementation is around 350 deg, and changes to around azimuth 100 deg. In A in FIG. 2, since there is a drive restriction at +270 deg, tracking cannot be smoothly performed with + rotation during one visible period. On the other hand, in A ′ in FIG. 2, tracking can be smoothly performed with −rotation during one visible period from around −10 deg to around −260 deg.

  In FIG. 2B, the azimuth angle at the start of supplementation is around 180 deg, and has changed to around azimuth 360 deg. In B in FIG. 2, when supplementation is started at + rotation, driving is limited at +270 deg. Therefore, after supplementing to +270 deg by + rotation, the rotation is reversed from +270 deg to −90 deg, and the remaining angle (from +270 deg to 360 deg) is obtained. There was a problem of trying to supplement the neighborhood with a single rotation. Note that B ′ in FIG. 2 can smoothly track from −180 deg. To 0 deg.

  In FIG. 2, the azimuth angle at the start of supplementation is around 200 deg, and changes to around azimuth angle 30 deg. In C ′ in FIG. 2, when supplementation is started at −rotation, driving is limited at −270 deg. Therefore, after supplementing up to −270 deg by one rotation, reverse rotation from −270 deg to +90 deg is performed, and the remaining angle ( There was a problem of trying to supplement the azimuth angle from 90 deg to around 30 deg) by + rotation. In FIG. 2, C can be smoothly tracked by + rotation during one visible period from around 200 deg to around 30 deg.

  As described above, in the tracking device in which the drive restriction is set, when driving is performed according to the antenna forecast value of the azimuth angle 0 to 360 deg, it is useless depending on whether the supplement is started by + rotation or the supplement is started by -rotation. There was a problem that reverse rotation would occur. Note that the above problem does not occur in a tracking device in which drive restriction is not set.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an antenna forecast value creation program that causes a computer to create an antenna forecast value for a tracking device that does not cause unnecessary reverse rotation.

  Therefore, in order to solve the above problems, the present invention provides an azimuth angle existence range indicated by an antenna prediction value supplied to a computer that creates an antenna prediction value for a tracking device capable of controlling the azimuth angle by positive rotation or negative rotation. Determining whether or not the tracking device is subject to drive restriction, and converting the azimuth angle existence range relating to the drive restriction out of the azimuth angle existence range indicated by the antenna forecast value into a reverse rotation azimuth angle It is an antenna forecast value creation program for executing the conversion step.

  In the present invention, when it is determined that the azimuth angle presence range indicated by the supplied antenna forecast value is related to the drive limitation of the tracking device, by converting the azimuth angle presence range related to the drive limitation to a reverse rotation azimuth, An antenna forecast value that does not limit the drive of the tracking device is created. That is, if the predicted antenna value created by the present invention is used for driving the tracking device, the space vehicle can be tracked without reverse rotation of the tracking device during one visible period.

  Moreover, in order to solve the said subject, this invention is good also as a recording medium which recorded the antenna forecast value production apparatus, the antenna forecast value creation method, and the antenna forecast value creation program.

  As described above, according to the present invention, it is possible to provide an antenna forecast value creation program that causes a computer to create an antenna forecast value for a tracking device that does not cause unnecessary reverse rotation.

  Next, the best mode for carrying out the present invention will be described based on the following embodiments with reference to the drawings.

  FIG. 3 is a system configuration diagram of an example of a tracking facility that uses a tracking device to track a space vehicle with an antenna, a radar, or the like. The tracking facility 1 in FIG. 3 is configured to include an antenna forecast value creation device 10 and a tracking device 20. Space vehicles that are tracked and supplemented by the tracking facility 1 are artificial satellites and space debris. Space debris is space debris such as remnants of spacecraft flying in outer space around the earth. In the tracking facility 1, the antenna prediction value generation device 10 generates an antenna prediction value indicating which direction of the tracking device 20 is directed from the predicted trajectory of the spacecraft, and the tracking device 20 is driven according to the antenna prediction value.

  The antenna predicted value generation apparatus 10 includes a trajectory prediction function unit 11, an antenna predicted value generation function unit 13 of 0 to 360 deg, and an antenna predicted value generation function unit 15 defined by ± 270 deg. The orbit prediction function unit 11 outputs the orbit prediction value 12 of the spacecraft. FIG. 4 is a configuration diagram illustrating an example of a predicted trajectory value. The predicted trajectory value consists of parameters representing date, time, position and speed.

  The antenna forecast value creation function unit 13 of 0 to 360 deg creates and outputs a source antenna forecast value 14 defined by 0 to 360 deg from the predicted trajectory value 12. The source antenna forecast value 14 includes parameters representing time, azimuth, and elevation.

  The antenna predicted value creation function unit 15 defined by ± 270 deg creates and outputs an antenna predicted value 16 defined by ± 270 deg from the source antenna predicted value 14 defined by 0 to 360 deg as described later. The antenna forecast value 16 includes parameters representing time, azimuth angle, and elevation angle, similar to the source antenna forecast value 14.

  The drive control function unit 21 of the tracking device 20 controls the directivity direction of the tracking device 20 according to the antenna forecast value 16. Further, the tracking device 20 is set to have a driving limit of azimuth angle 270 deg. That is, the tracking device 20 can be driven from azimuth angle 0 deg to +270 deg with + rotation and from azimuth angle 0 deg to −270 deg with −rotation.

  Next, the hardware configuration of the antenna predicted value generation apparatus 10 will be described. FIG. 5 is a hardware configuration diagram of an example of the antenna predicted value generation apparatus. 5 includes an input device 31, an output device 32, a drive device 33, an auxiliary storage device 34, a memory device 35, an arithmetic processing device 36, and an interface device 37, which are mutually connected by a bus. Configured to have. 5 may be housed in one housing or may be housed in a plurality of housings.

  The input device 31 includes a keyboard and a mouse, and is used for inputting various operation instructions. The output device 32 displays various windows and data necessary for operation. The interface device 37 is an interface for connecting to a network or the like, and includes, for example, a modem, a router, a LAN card, and the like.

  An antenna forecast value creation program for controlling the antenna forecast value creation apparatus 10 is provided by a recording medium 38 such as a CD-ROM. The recording medium 38 in which the antenna predicted value creation program is recorded is set in the drive device 33, and the antenna predicted value creation program is installed in the auxiliary storage device 34 from the recording medium 38 via the drive device 33.

  The recording medium 38 on which the antenna forecast value creation program is recorded is a recording medium for recording information optically, electrically or magnetically, such as a CD-ROM, flexible disk, magneto-optical disk (MO), or ROM. Various types of recording media, such as a semiconductor memory that electrically records information, such as a flash memory, can be used.

  Further, the antenna forecast value creation program includes a program recorded in a recording medium or the like of another computer connected via the interface device 37. The antenna forecast value creation program recorded in a recording medium or the like of another computer is downloaded via the interface device 37 and installed in the auxiliary storage device 34. The auxiliary storage device 34 stores the installed antenna forecast value creation program and various files necessary for the processing of the antenna forecast value creation program. For example, the auxiliary storage device 34 stores the orbit prediction value 12, the source antenna prediction value 14, and the antenna prediction value 16.

  The memory device 35 reads and stores the antenna forecast value creation program from the auxiliary storage device 34 at the time of activation. The arithmetic processing device 36 can realize a part or all of the functional units of the antenna predicted value generation device 10 according to the antenna predicted value generation program stored in the memory device 35.

  From here on, the processing of the ± 270 deg prescribed antenna forecast value creation function unit (hereinafter simply referred to as the antenna forecast value creation function unit) 15 included in the antenna forecast value creation device 10 will be mainly described.

  The antenna forecast value creation function unit 15 does not give an extra load to the tracking device 20 and does not cause unnecessary reverse rotation (+270 deg to −90 deg or −270 deg to +90 deg) during one visible period. An antenna forecast value 16 defined in the range of ± 270 deg from the source antenna forecast value 14 defined by 0 to 360 deg is created.

  The azimuth angle Xi (i = 1, N) of the source antenna forecast value 14 is as shown in FIGS. 6A to 6D according to the azimuth angle existence range (azimuth angle change) during one visible period. It can be divided into four cases (types). FIG. 6 is an explanatory diagram showing a case of the azimuth existing range during one visible period and an equation for calculating the antenna prediction value according to the case. In the example of FIG. 6, it is assumed that the azimuth existing range during one visible period is 180 deg or less.

  FIG. 6A shows a case where the azimuth angle Xi in one visible period does not cross the azimuth angle 0 deg, and the Xmax of the azimuth angle Xi is smaller than 270 deg. ing. FIG. 6B shows a case where the azimuth angle Xi in one visible period does not cross the azimuth angle 0 deg and the Xmax of the azimuth angle Xi is 270 deg or more, and the azimuth angle existence range is indicated by an arrow 42. Yes.

  FIG. 6C shows a case in which the azimuth angle Xi in one visible period crosses the azimuth angle 0 deg and the azimuth angle Xi does not cross the azimuth angle 90 deg. Yes. FIG. 6D shows a case where the azimuth angle Xi in one visible period crosses the azimuth angle 0 deg, and the azimuth angle Xi straddles the azimuth angle 90 deg. The azimuth angle existence range is indicated by an arrow 44. .

  Here, the azimuth angles 90 and 270 deg used to divide the case of the azimuth existing range during one visible period are set in the tracking device 20 -the azimuth angle -270 deg and + rotation which is the drive limitation of rotation. This corresponds to an azimuth angle of +270 deg which is a drive limitation.

  In the case of FIG. 6 (A), if the rotation is +, the drive is not limited. Therefore, the following formula (1) is used as a formula for calculating the antenna forecast value. That is, in the case of FIG. 6A, the azimuth angle Xi is directly converted to the azimuth angle Yi.

Yi = Xi (1)
In the case of FIG. 6 (B), if it is -rotation, it will not be a driving | running | working restriction | limiting, Therefore The following formula | equation (2) is utilized as a calculation formula of an antenna forecast value. That is, in the case of FIG. 6B, the azimuth angle Xi is converted into a -rotation azimuth angle Yi.

Yi = Xi-360deg (2)
In the case of FIG. 6 (C), since the drive limitation of -rotation is not applied, the following formulas (3) and (4) are used as formulas for calculating the antenna forecast value. That is, in the case of FIG. 6C, the azimuth angle Xi is divided into less than 90 deg and greater than 90 deg, the azimuth angle Xi less than 90 deg is directly converted into the azimuth angle Yi, and the azimuth angle Xi greater than 90 deg is converted to the azimuth angle of rotation. Convert to Yi.

Yi = Xi (Xi <90 deg) (3)
Yi = Xi-360 deg (Xi ≧ 90 deg) (4)
In addition, in the case of FIG. 6D, since + rotation drive restriction is not applied, the following formulas (5) and (6) are used as formulas for calculating the antenna forecast value. That is, in the case of FIG. 6D, the azimuth angle Xi is divided into less than 270 deg and 270 deg or more, and the azimuth angle Xi less than 270 deg is directly converted to the azimuth angle Yi, and the azimuth angle Xi of 270 deg or more is − Convert to angle Yi.

Yi = Xi (Xi <270 deg) (5)
Yi = Xi-360 deg (Xi ≧ 270 deg) (6)
The antenna forecast value creation function unit 15 creates the antenna forecast value 16 by the process of the flowchart of FIG. 7 using the above-described antenna forecast value calculation formulas (1) to (6). FIG. 7 is a flowchart of an example of a process for creating an antenna prediction value.

  In step S1, the antenna forecast value creation function unit 15 reads the source antenna forecast value Xi for one visible period from the source antenna forecast value file. Proceeding to step S2, the antenna forecast value creation function unit 15 obtains Xmax and Xmin of the source antenna forecast value Xi.

  Proceeding to step S3, the antenna predicted value generation function unit 15 determines whether or not the azimuth angle Xi in one visible period crosses the azimuth angle 0 deg according to the following equation (7). Α is a margin considering that the calculated value of the azimuth angle Xi is discrete. For example, a value of about 5 to 10 deg may be set.

Xmax−Xmin> 360 deg−α (7)
If it is determined that the azimuth angle Xi during one visible period does not cross the azimuth angle 0 deg (NO in S3), the antenna forecast value creation function unit 15 proceeds to step S4, and Xmax of the azimuth angle Xi is smaller than 270 deg. Invert whether or not. If it is determined that Xmax of azimuth angle Xi is smaller than 270 deg (YES in S4), antenna predicted value generation function unit 15 proceeds to step S5 and determines that the case of FIG. ) Converts the azimuth angle Xi to the azimuth angle Yi as it is.

  On the other hand, if it is determined that Xmax of azimuth angle Xi is larger than 270 deg (NO in S4), antenna predicted value generation function unit 15 proceeds to step S6 and determines that the case is shown in FIG. The azimuth angle Xi is converted to a -rotation azimuth angle Yi by (2).

  If it is determined in step S3 that the azimuth angle Xi in one visible period crosses the azimuth angle 0 deg (YES in S3), the antenna predicted value generation function unit 15 proceeds to step S7. In step S7, the antenna forecast value creation function unit 15 determines whether or not the azimuth angle Xi in one visible period crosses the azimuth angle 90 deg according to the following equation (8). Β is a margin considering that the calculated value of the azimuth angle Xi is discrete. For example, a value of about 5 to 10 degrees may be set.

90−β <(Xi + Xi + 1) / 2 <90 + β (8)
If it is determined that the azimuth angle Xi during one visible period does not straddle the azimuth angle 90 deg (NO in S7), the antenna forecast value creation function unit 15 proceeds to step S8 and determines that the case is shown in FIG. Then, the azimuth angle Xi of less than 90 deg is directly converted into the azimuth angle Yi and the azimuth angle Xi of 90 deg or more is converted into the -rotation azimuth angle Yi by the equations (3) and (4).

  On the other hand, if it is determined that the azimuth angle Xi in one visible period crosses the azimuth angle 90 deg (YES in S7), the antenna forecast value creation function unit 15 proceeds to step S9 and determines that the case is shown in FIG. Then, the azimuth angle Xi of less than 270 deg is directly converted into the azimuth angle Yi by the equations (5) and (6), and the azimuth angle Xi of 270 deg or more is converted into the -rotation azimuth angle Yi.

  According to the processing of the flowchart of FIG. 7, the antenna forecast value 16 defined in a range of ± 270 deg in which unnecessary reverse rotation does not occur during one visible period is generated from the source antenna forecast value 14 defined in 0 to 360 deg. it can.

  FIG. 8 is an image diagram of a process of creating an antenna forecast value defined by ± 270 deg from a source antenna forecast value defined by 0 to 360 deg according to the present invention. The image diagram of FIG. 8 represents the change in the azimuth angle of the tracking device 20 with respect to time. The solid line in FIG. 8 represents the source antenna forecast value 14 defined by 0 to 360 deg. The dotted line in FIG. 8 represents the antenna forecast value 16 defined by ± 270 deg.

  A solid line 51 and a dotted line 52 in FIG. 8 represent the case of FIG. A solid line 53 and a dotted line 54 represent the case of FIG. A solid line 55 and a dotted line 56 represent the case of FIG. A solid line 57 and a dotted line 58 represent the case of FIG. It can be seen from the antenna forecast values 16 indicated by the dotted lines 52, 54, 56 and 58 in FIG. 8 that the spacecraft can be smoothly tracked during one visible period without being restricted in driving.

  9 to 11 are configuration diagrams illustrating specific examples of source antenna forecast values and antenna forecast values converted so as not to be subject to driving restrictions. The antenna forecast value creation function unit 15 can create the antenna forecast value 16 as shown on the right side of FIGS. 9 to 11 from the source antenna forecast value 14 as shown on the left side of FIGS.

  FIG. 12 is an image diagram showing the source antenna forecast value and the antenna forecast value converted so as not to be subject to driving restrictions. The image diagram of FIG. 12 is based on the source antenna forecast value 14 shown on the left side of FIGS. 9 to 11 and the antenna forecast value 16 shown on the right side of FIGS. 9 to 11.

  In the case of the source antenna forecast value 14 shown in FIG. 9, the source antenna forecast value 14 is converted into the antenna forecast value 16 as it is. In the case of the source antenna predicted value 14 shown in FIG. 10, the source antenna predicted value 14 is converted into the antenna predicted value 16 so as not to be driven by the tracking device 20. Further, in the case of the source antenna forecast value 14 shown in FIG. 11, the source antenna forecast value 14 is converted into the antenna forecast value 16 so as not to be driven by the tracking device 20.

  As described above, if the antenna forecast value 14 created by the antenna forecast value creation device 10 according to the present invention is used, even if the tracking device 20 has a drive restriction with respect to the azimuth angle, useless reverse rotation occurs during the visible period. The spacecraft can be tracked smoothly.

In the present invention, the following configurations as described below are conceivable.
(Appendix 1)
In the computer that creates the antenna forecast value for the tracking device that can control the azimuth by positive rotation or negative rotation,
A determination step of determining whether or not the azimuth angle existence range indicated by the supplied antenna forecast value is subject to drive restriction of the tracking device;
An antenna prediction value creation program for executing a conversion step of converting an azimuth angle existence range related to the drive restriction into an azimuth angle of reverse rotation in the azimuth angle existence range indicated by the antenna prediction value.
(Appendix 2)
The determination step divides the azimuth angle existence range indicated by the antenna forecast value into a plurality of types according to the azimuth angle range of positive rotation or negative rotation that can be controlled by the tracking device,
2. The antenna forecast value creation program according to claim 1, wherein the conversion step converts the azimuth angle existence range related to the drive restriction into a reverse rotation azimuth angle using a mathematical formula corresponding to the type.
(Appendix 3)
In the determination step, the azimuth angle existence range X indicated by the antenna forecast value in accordance with the positive rotation azimuth maximum value A or the negative rotation azimuth maximum value B that can be controlled by the tracking device,
A type that does not straddle an azimuth angle of 0 degrees and the maximum value of the azimuth angle existence range X is smaller than the azimuth angle maximum value A;
A type that does not straddle an azimuth angle of 0 degrees and the maximum value of the azimuth angle existence range X is an azimuth angle maximum value A or more,
A type that spans an azimuth angle of 0 degrees and the azimuth angle existence range X does not cross the azimuth angle maximum value B,
The antenna forecast value creation program according to appendix 2, wherein the azimuth angle existence range X is divided into a type that straddles the azimuth angle maximum value B and straddles the azimuth angle of 0 degrees.
(Appendix 4)
The converting step includes
Formula Yi (i = 1 to N) = Xi corresponding to the type that does not cross the azimuth angle of 0 degrees and the maximum value of the azimuth angle existence range X is smaller than the maximum azimuth angle value A,
Formula Yi = Xi-360 degrees corresponding to a type that does not cross azimuth angle 0 degrees and the maximum value of azimuth angle existence range X is azimuth angle maximum value A or more,
Formula Yi = Xi (Xi <B), Formula Yi = Xi-360 degrees (X ≧ B) corresponding to the type in which the azimuth angle range spans 0 degrees and the azimuth angle existence range X does not cross the maximum azimuth angle B. ,
Formula Yi = Xi−360 degrees (A <Xi) and Formula Yi = Xi (A ≧ X) corresponding to the type in which the azimuth angle range spans the azimuth angle maximum value B across the azimuth angle 0 degree. The antenna forecast value creation program according to appendix 3, wherein the azimuth angle existence range related to the drive restriction is converted into a reverse rotation azimuth angle.
(Appendix 5)
An antenna forecast value creation device for creating an antenna forecast value for a tracking device capable of controlling an azimuth by positive rotation or negative rotation,
It is determined whether or not the azimuth angle existence range indicated by the supplied antenna forecast value is subject to drive restriction of the tracking device, and among the azimuth angle existence ranges indicated by the antenna forecast value, the azimuth angle existence range relevant to the drive restriction is determined. An antenna forecast value creation device comprising an antenna forecast value creation function unit for converting the azimuth into a reverse rotation azimuth.

  The present invention is not limited to the specifically disclosed embodiments, and various modifications and changes can be made without departing from the scope of the claims. For example, the drive limit ± 270 deg set in the tracking device 20 described above is an example, and may be a drive limit with a different azimuth. Even if the driving is limited to different azimuth angles, the present invention can be applied by adjusting the conditions for dividing the four cases shown in FIG.

  Further, the antenna forecast value creation device 10 shown in FIG. 3 has a configuration including the trajectory prediction function unit 11, the antenna forecast value creation function unit 13 of 0 to 360 deg, and the antenna forecast value creation function unit 15 defined by ± 270 deg. Further, the trajectory prediction function unit 11 and the antenna predicted value creation function unit 13 of 0 to 360 deg may be mounted on another device.

  The antenna prediction value creation function unit 13 of the trajectory prediction function unit 11, 0 to 360 deg, and the antenna prediction value creation function unit 15 defined by ± 270 deg can be appropriately aggregated and distributed.

It is an image figure of an example showing the drive restriction | limiting of a tracking apparatus. It is an image figure showing the relationship between the antenna forecast value prescribed | regulated by the azimuth | direction angle 0-360deg, and drive restrictions -270- + 270deg. It is a system configuration diagram of an example of a tracking facility for tracking a space vehicle with an antenna, a radar, or the like by a tracking device. It is a block diagram showing an example of an orbit prediction value. It is a hardware block diagram of an example of an antenna forecast value production apparatus. It is explanatory drawing showing the case of the azimuth existing range in 1 visible period, and the calculation formula of the antenna forecast value according to the case. It is a flowchart of an example of the process which produces an antenna forecast value. It is an image figure of the process which produces the antenna forecast value prescribed | regulated by +/- 270deg from the source antenna forecast value prescribed | regulated by 0-360deg by this invention. It is a block diagram showing the specific example of the antenna forecast value converted so that it might not be subject to a source antenna forecast value and drive restrictions. It is a block diagram showing the specific example of the antenna forecast value converted so that it might not be subject to a source antenna forecast value and drive restrictions. It is a block diagram showing the specific example of the antenna forecast value converted so that it might not be subject to a source antenna forecast value and drive restrictions. It is an image figure showing the antenna forecast value converted so that it may not be applied to a source antenna forecast value and drive restrictions.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tracking equipment 10 Antenna forecast value preparation apparatus 11 Trajectory prediction function part 12 Orbit prediction value 13 Antenna forecast value creation function part of 0-360 deg 14 Source antenna forecast value 15 Antenna forecast value creation function part of ± 270 deg regulation 16 Antenna forecast value 20 Tracking device 21 Drive control function unit 31 Input device 32 Output device 33 Drive device 34 Auxiliary storage device 35 Memory device 36 Arithmetic processing device 37 Interface device 38 Recording medium

Claims (3)

In the computer that creates the antenna forecast value for the tracking device that can control the azimuth by positive rotation or negative rotation,
A determination step of determining whether or not the azimuth angle existence range indicated by the supplied antenna forecast value is subject to drive restriction of the tracking device;
An antenna prediction value creation program for executing a conversion step of converting an azimuth angle existence range related to the drive restriction into an azimuth angle of reverse rotation in the azimuth angle existence range indicated by the antenna prediction value. The determination step divides the azimuth angle existence range indicated by the antenna forecast value into a plurality of types according to the azimuth angle range of positive rotation or negative rotation that can be controlled by the tracking device,
2. The antenna forecast value creation program according to claim 1, wherein the conversion step converts the azimuth angle existence range applied to the drive restriction into a reverse rotation azimuth angle using a mathematical formula corresponding to the type. In the determination step, the azimuth angle existence range X indicated by the antenna forecast value in accordance with the positive rotation azimuth maximum value A or the negative rotation azimuth maximum value B that can be controlled by the tracking device,
A type that does not straddle an azimuth angle of 0 degrees and the maximum value of the azimuth angle existence range X is smaller than the azimuth angle maximum value A;
A type that does not straddle an azimuth angle of 0 degrees and the maximum value of the azimuth angle existence range X is an azimuth angle maximum value A or more,
A type that spans an azimuth angle of 0 degrees and the azimuth angle existence range X does not cross the azimuth angle maximum value B,
3. The antenna forecast value creation program according to claim 2, wherein the antenna forecast value creation program is divided into types that span an azimuth angle of 0 degrees and the azimuth angle existence range X straddles an azimuth angle maximum value B.

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