CN113691301A - Method and device for measuring shielding of ship satellite communication antenna - Google Patents
Method and device for measuring shielding of ship satellite communication antenna Download PDFInfo
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- CN113691301A CN113691301A CN202110968971.5A CN202110968971A CN113691301A CN 113691301 A CN113691301 A CN 113691301A CN 202110968971 A CN202110968971 A CN 202110968971A CN 113691301 A CN113691301 A CN 113691301A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/40—Monitoring; Testing of relay systems
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Abstract
The invention discloses a method and a device for measuring the shielding of a ship satellite communication antenna, which are characterized by firstly obtaining the current pitch angle and the shielding pitch angle of the satellite communication antenna and the absolute shielding angle of a ship mast on the satellite communication antenna, then calculating a reference included angle, judging that the satellite communication antenna is in a first shielding state when the current pitch angle of the satellite communication antenna is smaller than the shielding pitch angle and is larger than zero and smaller than half of the absolute shielding angle, and judging that the satellite communication antenna is in a second shielding state when the reference included angle is smaller than zero and larger than a negative value of half of the absolute shielding angle. The technical scheme of the invention can find whether the shielding is caused and give the processing suggestion in time, thereby avoiding communication interruption.
Description
Technical Field
The application belongs to the technical field of satellite communication, and particularly relates to a method and a device for measuring ship satellite communication antenna shielding.
Background
The ship basically depends on satellite communication to transmit information, the VSAT installed on the ship and a ship mast are arranged on the ship, the VSAT communication is possibly interrupted due to shielding between the satellites, the satellite communication can be influenced after the interruption, and if the navigation is not influenced and a network is needed, the communication can be recovered by adjusting the course and the like. In general, to avoid interruption of satellite communication, it is necessary to grasp the blocking condition in time to avoid interruption of communication.
The VSAT occlusion can calculate an absolute occlusion angle at present, and the communication condition in the later use process can be measured through the occlusion angle. When the ship sails and is anchored, whether the current position under the network-accessing satellite is blocked or not can not be calculated. In the traditional technical scheme, the problem can be solved only after the VSAT of the ship is shielded, and the time and the cost for processing the problem are increased.
Disclosure of Invention
The application aims to provide a method and a device for measuring the shielding of a ship satellite communication antenna, which are used for measuring the shielding of the satellite communication antenna when a ship VSAT is to be shielded, early warning is carried out in advance, and communication interruption is avoided.
In order to achieve the purpose, the technical scheme of the application is as follows:
a method for measuring shielding of a ship satellite communication antenna comprises the following steps:
acquiring longitude and latitude of a ship and a satellite, height and width of a ship mast, installation height of a satellite communication antenna, and horizontal distance and vertical distance between the ship mast and the satellite communication antenna;
calculating the current pitch angle and the shielding pitch angle of the satellite communication antenna and the absolute shielding angle of the ship mast on the satellite communication antenna through the following formulas:
wherein x is1As longitude, x, of the vessel2Is the longitude, y, of the satellite1The latitude of the ship, alpha is a parameter and represents the ratio of the radius of the earth to the distance from the satellite to the geocenter. W is the width of the ship mast, H1For satellite communication antenna mounting height, H2Height of vessel mast, L1For the horizontal distance, L, between ship mast and satellite communication antenna2For the horizontal distance, theta, between the ship mast and the satellite communication antennaHTo block the pitch angle, θCFor absolute shielding angle, θUThe current pitch angle is the satellite communication antenna;
acquiring an included angle of a ray from a satellite communication antenna to a ship mast relative to the due north direction, an included angle of a bow relative to the due north direction and an included angle between the projection of a connecting line between the satellite communication antenna and a satellite on a ground plane and the due north direction, and calculating a reference included angle;
when the current pitch angle of the satellite communication antenna is smaller than the shielding pitch angle, the satellite communication antenna is judged to be in a first shielding state when the reference included angle is larger than zero and smaller than half of the absolute shielding angle, and is judged to be in a second shielding state when the reference included angle is smaller than zero and larger than a negative value of half of the absolute shielding angle.
Furthermore, the included angle of the ray from the satellite communication antenna to the ship mast relative to the due north direction is thetaDThe included angle between the projection of the connecting line between the satellite communication antenna and the satellite on the ground plane and the true north direction is thetaGSaid reference angle is equal to thetaDAnd thetaGThe difference between them.
Furthermore, the projection of a connecting line between the satellite communication antenna and the satellite on the ground plane forms an included angle theta with the true north directionGCalculated according to the following formula:
θG＝((180/π)*(x1-x2))/sin((180/π)/y1)。
further, the included angle between the bow and the due north direction is thetaEWhen the first shielding state, the clockwise rotation angle is to avoid shielding: thetaC/2+θG-θD-θE(ii) a In the second shielding state, the counterclockwise rotation angle is thetaE-(θG-θC/2-θD)。
The application also provides a device for measuring the shielding of the ship satellite communication antenna, which comprises a processor and a memory, wherein the memory is stored with a plurality of computer instructions, and the computer instructions are executed by the processor to realize the steps of the method for measuring the shielding of the ship satellite communication antenna.
According to the ship satellite communication antenna shielding measuring method and device, whether shielding is achieved or not is calculated through the height, width, longitude and latitude, VSAT networking satellite longitude and other parameters of the ship shielding object, ship processing suggestions can be informed in advance through calculated shielding, communication interruption is avoided, and the ability of a service client can be effectively improved, and problems can be timely and accurately found and processed.
Drawings
FIG. 1 is a flowchart of a method for measuring the shielding of a ship satellite communication antenna according to the present application;
fig. 2 is a schematic view of the measurement principle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The application provides a method for measuring the shielding of a ship satellite communication antenna, which can calculate whether the shielding exists below a current network-accessing satellite when a ship sails and is anchored, particularly can not well let the ship know the impending communication condition in advance when the ship is in a severe weather condition, and can prejudge whether the shielding exists in VSAT communication in advance by the method, so that measures are taken to avoid communication interruption.
In one embodiment, as shown in fig. 1, there is provided a method for measuring ship satellite communication antenna shielding, including:
and S1, acquiring longitude and latitude of the ship and the satellite, the height and width of a ship mast, the installation height of the satellite communication antenna, and the horizontal distance and the vertical distance between the ship mast and the satellite communication antenna.
The longitude and latitude information can be obtained through a satellite communication earth station VSAT installed on a ship, and the longitude and latitude information of the satellite can also be obtained when the VAST carries out communication on the satellite. Based on the method, the longitude and latitude information of the ship and the satellite can be conveniently acquired.
The height and width of the ship mast, the installation height of the satellite communication antenna, the horizontal distance and the vertical distance between the ship mast and the satellite communication antenna, and the like, wherein the installation positions of the ship mast and the satellite communication antenna on the ship are generally fixed. Therefore, by adopting some conventional measuring means, the data such as the height and the width of the ship mast, the installation height of the satellite communication antenna, the horizontal distance and the vertical distance between the ship mast and the satellite communication antenna and the like can be conveniently acquired.
Step S2, calculating the current pitch angle and the shielding pitch angle of the satellite communication antenna and the absolute shielding angle of the ship mast to the satellite communication antenna through the following formulas:
wherein x is1As longitude, x, of the vessel2Is the longitude, y, of the satellite1The latitude of the ship, alpha is a parameter and represents the ratio of the radius of the earth to the distance from the satellite to the geocenter. W is the width of the ship mast, H1For satellite communication antenna mounting height, H2Height of vessel mast, L1For the horizontal distance, L, between ship mast and satellite communication antenna2The horizontal distance between the ship mast and the satellite communication antenna. ThetaHTo block the pitch angle, θCIs the absolute shielding angle. ThetaUIs the current pitch angle of the satellite communication antenna.
And step S3, acquiring an included angle of a ray from the satellite communication antenna to the ship mast relative to the due north direction, an included angle of a bow relative to the due north direction and an included angle between the projection of a connecting line between the satellite communication antenna and the satellite on the ground plane and the due north direction, and calculating a reference included angle.
On the ship, the included angle of the ray from the satellite communication antenna to the ship mast relative to the due north direction, the included angle of the bow relative to the due north direction, and the included angle between the projection of the connecting line between the satellite communication antenna and the satellite on the ground plane and the due north direction can be obtained and calculated.
For example: the ship can obtain the direction theta of the bow through the position for installing the VSAT and inertial navigation in the VSATE。
Theta when the bow is oriented in the north directionEEqual to 0, the angle between the ray from the satellite communication antenna to the mast and the true north is thetaD(satellite communication antenna is located at the lower left of the ship mast):
the difference of the installation positions of the satellite communication antennas leads to the included angle thetaDIn contrast, for example, when the satellite communications antenna is located on the upper right of the ship mast:
when the satellite communication antenna is positioned below the right of the ship mast:
when the satellite communication antenna is positioned on the left upper part of the ship mast:
and the included angle theta between the bow and the due north directionEWhen the angle is not equal to 0, the included angle theta between the ray from the satellite communication antenna to the mast and the true northDWhen the satellite communication antenna is positioned at the lower left of the ship mast, the satellite communication antenna is calculated by the following formula:
it should be noted that θ is the position of the satellite communication antenna at the other position of the ship mastDAlso need to add thetaEThe formula is similar to the above formula, and is not described herein again. The angle is expressed in radian units, and the conversion of the angle to the radian is required to be multiplied by pi/180, which is not described in detail herein. If theta is greater than thetaDThe result of the calculation of (d) is greater than 2 pi, and 2 pi needs to be subtracted.
The projection of a connecting line between the satellite communication antenna and the satellite on the ground plane forms an included angle theta with the true north directionGThe calculation formula is as follows:
θG＝((180/π)*(x1-x2))/sin((180/π)*y1)。
to which this application refershThe difference between the included angles in the north and the south is:
θh＝θD-θG。
and step S4, when the current pitch angle of the satellite communication antenna is smaller than the shielding pitch angle, judging that the satellite communication antenna is in a first shielding state when the reference included angle is larger than zero and smaller than a half of the absolute shielding angle, and judging that the satellite communication antenna is in a second shielding state when the reference included angle is smaller than zero and larger than a negative value of the half of the absolute shielding angle.
This application has two kinds to shelter from the state, when judging, earlier compare the satellite communication antenna current every single move angle with shelter from every single move angle, then compare reference contained angle and the absolute angle of sheltering from.
Specifically, the first shielding state is set when the reference included angle is greater than zero and less than half of the absolute shielding angle.
Namely: thetaU＜θH，θh＞0，θh＜θCAnd/2, in a first shielding state.
At this time, the shielding rate K is:
K＝1-2*(θh/θC)
when in the first shielding state, the shielding can be avoided by clockwise rotating a certain angle, and the rotating angle is thetaC/2+θG-θD-θE。
And when the reference included angle is smaller than zero and is larger than a negative value of half of the absolute shielding angle, the shielding state is in a second shielding state.
Namely: thetaU<θH，θh<0，θh>-θCAnd/2, in a second shielding state.
At this time, the shielding rate K is:
K＝1-2*(θh/θC)
in the second shielding state, the shielding can be avoided by rotating counterclockwise by a certain angle, and the rotating angle is thetaE-(θG-θC/2-θD)。
The above-mentioned non-listed condition is a non-occlusion state, and the processing may not be necessary, which is not described herein again.
Whether the ship shelter from is calculated through the height, width, longitude and latitude, VSAT networking satellite longitude and other parameters of the ship shelter from, ship processing suggestions can be informed in advance through the calculated shelter from, communication interruption is avoided, and the ability of a service client can be effectively improved, and problems can be timely and accurately found and processed.
In another embodiment, the application further provides a device for measuring the ship satellite communication antenna occlusion, which includes a processor and a memory storing several computer instructions, and the computer instructions, when executed by the processor, implement the steps of the method for measuring the ship satellite communication antenna occlusion.
For specific limitations of the measurement device for the ship satellite communication antenna shielding, reference may be made to the above limitations of the measurement method for the ship satellite communication antenna shielding, and details are not repeated here. The device for measuring the shielding of the ship satellite communication antenna can be completely or partially realized by software, hardware and a combination thereof. The method can be embedded in hardware or independent from a processor in the computer device, and can also be stored in a memory in the computer device in software, so that the processor can call and execute the corresponding operation.
The memory and the processor are electrically connected, directly or indirectly, to enable transmission or interaction of data. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The memory stores a computer program that can be executed on the processor, and the processor executes the computer program stored in the memory, thereby implementing the network topology layout method in the embodiment of the present invention.
The Memory may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory is used for storing programs, and the processor executes the programs after receiving the execution instructions.
The processor may be an integrated circuit chip having data processing capabilities. The Processor may be a general-purpose Processor including a Central Processing Unit (CPU), a Network Processor (NP), and the like. The various methods, steps and logic blocks disclosed in embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A method for measuring the shielding of a ship satellite communication antenna is characterized by comprising the following steps:
acquiring longitude and latitude of a ship and a satellite, height and width of a ship mast, installation height of a satellite communication antenna, and horizontal distance and vertical distance between the ship mast and the satellite communication antenna;
calculating the current pitch angle and the shielding pitch angle of the satellite communication antenna and the absolute shielding angle of the ship mast on the satellite communication antenna through the following formulas:
wherein x is1As longitude, x, of the vessel2Is the longitude, y, of the satellite1Is the latitude of the ship, alpha is a parameter and represents the ratio of the radius of the earth to the distance from the satellite to the geocentric, W is the width of a ship mast, and H1For satellite communication antenna mounting height, H2Height of vessel mast, L1For the horizontal distance, L, between ship mast and satellite communication antenna2For the horizontal distance, theta, between the ship mast and the satellite communication antennaHTo block the pitch angle, θCFor absolute shielding angle, θUThe current pitch angle is the satellite communication antenna;
acquiring an included angle of a ray from a satellite communication antenna to a ship mast relative to the due north direction, an included angle of a bow relative to the due north direction and an included angle between the projection of a connecting line between the satellite communication antenna and a satellite on a ground plane and the due north direction, and calculating a reference included angle;
when the current pitch angle of the satellite communication antenna is smaller than the shielding pitch angle, the satellite communication antenna is judged to be in a first shielding state when the reference included angle is larger than zero and smaller than half of the absolute shielding angle, and is judged to be in a second shielding state when the reference included angle is smaller than zero and larger than a negative value of half of the absolute shielding angle.
2. The method for measuring the shielding of the ship satellite communication antenna according to claim 1, wherein the included angle of the ray from the satellite communication antenna to the ship mast relative to the due north direction is thetaDThe included angle between the projection of the connecting line between the satellite communication antenna and the satellite on the ground plane and the true north direction is thetaGSaid reference angle is equal to thetaDAnd thetaGThe difference between them.
3. The method for measuring the shielding of a ship satellite communication antenna according to claim 2, wherein the angle θ between the projection of the connecting line between the satellite communication antenna and the satellite on the ground plane and the due north directionGCalculated according to the following formula:
θG＝((180/π)*(x1-x2))/sin((180/π)*y1)。
4. the method for measuring the shielding of a ship satellite communication antenna according to claim 2, wherein the included angle of the bow relative to the due north direction is thetaEWhen the first shielding state, the clockwise rotation angle is to avoid shielding: thetaC/2+θG-θD-θE(ii) a In the second shielding state, the counterclockwise rotation angle is thetaE-(θG-θC/2-θD)。
5. A device for measuring the blockage of a ship satellite communication antenna, comprising a processor and a memory storing computer instructions, wherein the computer instructions, when executed by the processor, implement the steps of the method according to any one of claims 1 to 4.
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| CN202110968971.5A CN113691301B (en) | 2021-08-23 | 2021-08-23 | Method and device for measuring shielding of ship satellite communication antenna |
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2021
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| JP2003344091A (en) * | 2002-05-24 | 2003-12-03 | Mitsubishi Heavy Ind Ltd | System for finding direction of bow to transmit and receive electric wave of geostationary satellite |
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