CN115278794A - Communication switching system and method for low-earth-orbit satellite - Google Patents
Communication switching system and method for low-earth-orbit satellite Download PDFInfo
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- CN115278794A CN115278794A CN202210824226.8A CN202210824226A CN115278794A CN 115278794 A CN115278794 A CN 115278794A CN 202210824226 A CN202210824226 A CN 202210824226A CN 115278794 A CN115278794 A CN 115278794A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0094—Definition of hand-off measurement parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
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Abstract
The application discloses a communication switching system and method for a low-orbit satellite, which relate to the technical field of satellite communication and can avoid network delay caused by switching a satellite tracked by an antenna array surface by a servo system. The system at least comprises a main control device, an electronic switch, a first antenna array surface and a second antenna array surface; the main control device is configured to: monitoring a first signal intensity parameter between the first antenna array face and a first satellite passing through the top tracked by the first antenna array face when the current channel is the channel of the first antenna array face; in the process of monitoring the first signal strength parameter, determining a second overhead satellite from the current candidate overhead satellite according to the relative position parameter of the position of the current candidate overhead satellite and the current geographic position, and controlling a second antenna array to track the second overhead satellite; and switching the current channel to the channel of the second antenna array by controlling the electronic switch when the first signal strength parameter is determined to meet the first preset condition.
Description
Technical Field
The present application relates to the field of satellite communications technologies, and in particular, to a communication switching system and method for a low earth orbit satellite.
Background
In the prior art, in a low-orbit satellite communication system, a parabolic antenna can continuously track a satellite to realize network communication. Since the low-earth satellite is a satellite moving around the earth and the position of the low-earth satellite is constantly changing, when the low-earth satellite moves below the ground level (i.e. the parabolic antenna cannot track the satellite) during the tracking of the satellite by the parabolic antenna, another satellite needs to be tracked by switching to ensure normal network communication.
However, in the low earth orbit satellite communication system, the satellite tracked by the parabolic antenna is generally switched by the servo system, and the switching time delay is long, which may affect the experience of the user in using the network.
Disclosure of Invention
The application provides a communication switching system and method for a low-orbit satellite, which can avoid network time delay caused by switching a satellite tracked by an antenna array surface by a servo system by tracking the overhead satellite through two antenna array surfaces.
In order to achieve the purpose, the technical scheme is as follows:
in a first aspect, the present application provides a communication switching system for a low earth orbit satellite, the system at least comprising a main control device, an electronic switch, a first antenna array and a second antenna array; wherein the main control device is configured to: monitoring a first signal intensity parameter between a first antenna array face and a first overhead satellite tracked by the first antenna array face under the condition that a current channel is a channel of the first antenna array face; in the process of monitoring the first signal strength parameter, determining a second overhead satellite from the current candidate overhead satellite according to the relative position parameter of the position of the current candidate overhead satellite and the current geographic position, and controlling a second antenna array to track the second overhead satellite; and then, under the condition that the first signal strength parameter is determined to meet a first preset condition, switching the current channel to the channel of the second antenna array by controlling the electronic switch.
In the technical scheme provided by the application, the communication switching system of the low earth orbit satellite can comprise a first antenna array surface, a second antenna array surface, an electronic switch and a main control device. When the first antenna array surface tracks the first overhead satellite and the current channel is the channel of the first antenna array surface, the main control device may monitor the signal quality (i.e., the first signal strength parameter) of the current channel, and may determine the second overhead satellite from the current candidate overhead satellites in the monitoring process, and control the second antenna array surface to track the second overhead satellite. In the process that the first antenna array surface tracks the first overhead satellite, the signal quality of the channel of the first antenna array surface gradually weakens until the first antenna array surface disappears, and the main control device can switch the current channel into the channel of the second antenna array surface by controlling the electronic switch before the signal quality disappears (namely when the first signal strength parameter meets the first preset condition). Since the second antenna array has already been tracked to the second overhead satellite in advance before switching channels, network delay due to the servo system switching the satellite tracked by the second antenna array can be avoided. It can be seen that in the technical scheme provided by the application, the satellite over the top is tracked through the two antenna arrays, and the channels of the two antenna arrays are switched through the electronic switch, so that the network delay caused by switching the satellite tracked by the antenna arrays through the servo system can be avoided, and the experience of a user in using the network can be improved.
Optionally, in a possible design manner, the relative position parameter is an off-axis angle of the position of the current candidate overhead satellite relative to the current geographic position; the off-axis angle is an included angle between the first line segment and a first coordinate axis in a preset three-dimensional coordinate system; the first line segment is a connecting line between the position of the current candidate overhead satellite and the current geographic position; the method comprises the steps that a coordinate origin of a three-dimensional coordinate system is preset as a current geographic position, the positive direction of a first coordinate axis is vertical to a ground plane and upwards, the positive direction of a second coordinate axis in the three-dimensional coordinate system is a geographic true south direction, and the positive direction of a third coordinate axis in the three-dimensional coordinate system is a geographic true east direction;
the master control device is specifically configured to:
in the process of monitoring the first signal strength parameter, the over-top satellite with the smallest off-axis angle relative to the current geographic position in the current candidate over-top satellites is determined as the second over-top satellite.
Optionally, in another possible design, the main control device is further configured to:
and updating the candidate overhead satellites once at preset intervals according to the off-axis angles of the positions of the satellites in the low-orbit satellite constellation relative to the current geographic position.
Optionally, in another possible design, the main control device is configured to:
determining the target satellite as a candidate overhead satellite under the condition that the off-axis angle of the position of the target satellite relative to the current geographic position is larger than a preset angle; the target satellite is any one of a constellation of low earth orbit satellites.
Optionally, in another possible design manner, the first preset condition is that the parameter value is less than or equal to a first preset parameter value; the master control device is specifically configured to:
determining that a parameter value of a first signal strength parameter is less than or equal to a second preset parameter value before determining a second overhead satellite from the current candidate overhead satellites according to a relative position parameter between the position of the current candidate overhead satellite and the current geographic position; the second preset parameter value is greater than the first preset parameter value.
Optionally, in another possible design, the main control device is further configured to:
monitoring a second signal strength parameter between the second antenna array and a second over-the-top satellite after switching the current channel to the channel of the second antenna array by controlling the electronic switch;
in the process of monitoring the second signal intensity parameter, determining a third overhead satellite from the current candidate overhead satellite according to the relative position parameter of the position of the current candidate overhead satellite and the current geographic position, and controlling the first antenna array to track the third overhead satellite; and then, under the condition that the second signal strength parameter is determined to meet the first preset condition, switching the current channel to the channel of the first antenna array by controlling the electronic switch.
Optionally, in another possible design, the communication handover system for a low earth orbit satellite further includes: the servo control system comprises a first servo motor, a first servo controller, a second servo motor and a second servo controller; the first servo motor is respectively connected with the first antenna array surface and the first servo controller, and the second servo motor is respectively connected with the second antenna array surface and the second servo controller; the first servo controller is respectively connected with the main control equipment and the electronic switch through a first external interface, and the second servo controller is respectively connected with the main control equipment and the electronic switch through a second external interface;
the main control device is further configured to: before monitoring a first signal intensity parameter between a first antenna array face and a first overhead satellite tracked by the first antenna array face, determining the first overhead satellite from current candidate overhead satellites, and sending a first control signal to a first servo controller through a first external interface; the first control signal is used for indicating the first servo controller to control the first servo motor to start, so that the first servo motor drives the first antenna array surface to rotate until the first overhead satellite is tracked;
the master control device is specifically configured to: after a second overhead satellite is determined from the current candidate overhead satellites, sending a second control signal to a second servo controller through a second external interface; the second control signal is used for indicating the second servo controller to control the second servo motor to start, so that the second servo motor drives the second antenna array surface to rotate until the second overhead satellite is tracked.
Optionally, in another possible design, the communication handover system for a low earth orbit satellite further includes: a first tracker and a second tracker; the first tracking machine is used for acquiring signal intensity parameters between the first antenna array surface and the overhead satellite tracked by the first antenna array surface; and the second tracking machine is used for acquiring the signal strength parameters between the second antenna array and the overhead satellite tracked by the second antenna array.
In a second aspect, the present application provides a communication handover method for a low earth orbit satellite, which is applied to the communication handover system for a low earth orbit satellite described in the first aspect, and the method includes:
the method comprises the steps that under the condition that a current channel is a channel of a first antenna array face, a main control device monitors a first signal intensity parameter between the first antenna array face and a first overhead satellite tracked by the first antenna array face;
in the process of monitoring the first signal strength parameter, the main control equipment determines a second overhead satellite from the current candidate overhead satellite according to the relative position parameter of the position of the current candidate overhead satellite and the current geographic position, and controls a second antenna array to track the second overhead satellite; and then, under the condition that the first signal strength parameter is determined to meet a first preset condition, switching the current channel to the channel of the second antenna array by controlling the electronic switch.
Optionally, in a possible design manner, the relative position parameter is an off-axis angle of the position of the current candidate overhead satellite relative to the current geographic position; the off-axis angle is an included angle between the first line segment and a first coordinate axis in a preset three-dimensional coordinate system; the first line segment is a connecting line between the position of the current candidate overhead satellite and the current geographic position; the method comprises the steps that a coordinate origin of a three-dimensional coordinate system is preset as a current geographic position, the positive direction of a first coordinate axis is vertical to a ground plane and upwards, the positive direction of a second coordinate axis in the three-dimensional coordinate system is a geographic true south direction, and the positive direction of a third coordinate axis in the three-dimensional coordinate system is a geographic true east direction;
the "determining a second overhead satellite from the current candidate overhead satellite according to the relative position parameter between the position of the current candidate overhead satellite and the current geographic position" may include:
and determining the over-top satellite with the smallest off-axis angle relative to the current geographic position in the current candidate over-top satellites as a second over-top satellite.
Optionally, in another possible design, the communication handover method for a low earth orbit satellite provided by the present application may further include:
and updating the candidate overhead satellites once at preset time intervals according to the off-axis angles of the positions of the satellites in the low-orbit satellite constellation relative to the current geographic position.
Optionally, in another possible design manner, the "updating the candidate overhead satellite once at preset intervals according to the off-axis angle of the position of each satellite in the low-orbit satellite constellation relative to the current geographic position" may include:
determining the target satellite as a candidate overhead satellite under the condition that the off-axis angle of the position of the target satellite relative to the current geographic position is larger than a preset angle; the target satellite is any satellite in a low earth orbit satellite constellation.
Optionally, in another possible design manner, the first preset condition is that the parameter value is less than or equal to a first preset parameter value; the "determining a second overhead satellite from the current candidate overhead satellite according to the relative position parameter between the position of the current candidate overhead satellite and the current geographic position" may include:
under the condition that the parameter value of the first signal strength parameter is smaller than or equal to a second preset parameter value, determining a second overhead satellite from the current candidate overhead satellite according to the relative position parameter between the position of the current candidate overhead satellite and the current geographic position; the second preset parameter value is greater than the first preset parameter value.
Optionally, in another possible design, after "switching the current channel to the channel of the second antenna array by controlling the electronic switch", the method may further include:
monitoring a second signal strength parameter between the second antenna array and the second over-the-top satellite;
in the process of monitoring the second signal intensity parameter, determining a third overhead satellite from the current candidate overhead satellite according to the relative position parameter of the position of the current candidate overhead satellite and the current geographic position, and controlling the first antenna array to track the third overhead satellite; and then, under the condition that the second signal strength parameter is determined to meet the first preset condition, switching the current channel to the channel of the first antenna array by controlling the electronic switch.
Optionally, in another possible design, before the monitoring the first signal strength parameter between the first antenna array surface and the first overhead satellite tracked by the first antenna array surface, the method may further include:
determining a first overhead satellite from the current candidate overhead satellites, and sending a first control signal to a first servo controller through a first external interface; the first control signal is used for indicating the first servo controller to control the first servo motor to start, so that the first servo motor drives the first antenna array surface to rotate until the first overhead satellite is tracked;
after the "determining the second overhead satellite from the current candidate overhead satellites" is performed, the method may further include: sending a second control signal to a second servo controller through a second external interface; the second control signal is used for indicating the second servo controller to control the second servo motor to start, so that the second servo motor drives the second antenna array surface to rotate until the second overhead satellite is tracked.
For the description of the second aspect in the present application, reference may be made to the detailed description of the first aspect; in addition, for the beneficial effects described in the second aspect, reference may be made to the beneficial effect analysis of the first aspect, which is not described herein again.
In the present application, the names of the above-mentioned devices or functional modules are not limited, and in actual implementation, the devices or functional modules may be represented by other names. Insofar as the functions of the individual devices or functional modules are similar to those of the present application, they are within the scope of the claims and their equivalents.
These and other aspects of the present application will be more readily apparent from the following description.
Drawings
Fig. 1 is a schematic structural diagram of a communication switching system of a low earth orbit satellite according to an embodiment of the present application;
fig. 2 is a schematic coordinate diagram of a predetermined three-dimensional coordinate system according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another communication switching system for low earth orbit satellites according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a communication switching system for a low earth orbit satellite according to an embodiment of the present application;
fig. 5 is a flowchart illustrating a communication handover method for a low earth orbit satellite according to an embodiment of the present disclosure.
Detailed Description
The communication handover system and method for low earth orbit satellites provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.
The terms "first" and "second" and the like in the specification and drawings of the present application are used for distinguishing different objects or for distinguishing different processes for the same object, and are not used for describing a specific order of the objects.
Furthermore, the terms "including" and "having," and any variations thereof, as referred to in the description of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In the description of the present application, the meaning of "a plurality" means two or more unless otherwise specified.
In addition, the data acquisition, storage, use, processing and the like in the technical scheme of the application all conform to relevant regulations of national laws and regulations.
In the prior art, in a low-orbit satellite communication system, a parabolic antenna can continuously track a satellite to realize network communication. Since the low-orbit satellite is a satellite moving around the earth and the position of the low-orbit satellite is constantly changing, when the low-orbit satellite moves below the ground level (i.e. the parabolic antenna cannot track the satellite) during tracking the satellite, another satellite needs to be tracked by switching to ensure normal network communication. However, in the low earth orbit satellite communication system, the satellite tracked by the parabolic antenna is generally switched by the servo system, and the switching time delay is long, which may affect the user experience of using the network.
In view of the above problems in the prior art, an embodiment of the present application provides a communication switching system for a low earth orbit satellite, where the system tracks an overhead satellite through two antenna arrays and switches channels of two antenna arrays through an electronic switch, so as to avoid network delay caused by switching the satellite tracked by the antenna arrays by a servo system, thereby improving user experience in using a network.
Referring to fig. 1, an embodiment of the present application provides a schematic diagram of a possible structure of a communication handover system for a low earth orbit satellite. As shown in fig. 1, the communication switching system of the low earth orbit satellite may include: main control device 01, electronic switch 02, first antenna array 03 and second antenna array 04.
The main control device 01 is configured to: monitoring a first signal intensity parameter between the first antenna array face 03 and a first overhead satellite tracked by the first antenna array face 03 under the condition that the current channel is the channel of the first antenna array face 03; in the process of monitoring the first signal strength parameter, according to the relative position parameter of the position of the current candidate overhead satellite and the current geographic position, determining a second overhead satellite from the current candidate overhead satellite, and controlling a second antenna array surface 04 to track the second overhead satellite; then, in the case that it is determined that the first signal strength parameter satisfies the first preset condition, the current channel is switched to the channel of the second antenna array 04 by controlling the electronic switch 02.
The first signal strength parameter may be indicative of a network quality of a channel of the first antenna array 03 when the first antenna array 03 tracks the first satellite over the top. For example, the signal strength parameter in the embodiment of the present application may be an Automatic Gain Control (AGC) value, and the AGC value is gradually decreased to 0 if the tracked overhead satellite is not switched during the process of tracking the overhead satellite by the antenna.
In addition, the antenna array referred to in the embodiments of the present application may be a parabolic antenna.
The current geographical position may be the geographical position of the first antenna array plane 03 and the second antenna array plane 04. The current candidate over-the-top satellite is a low-orbit satellite which is in a visible range of the current geographic position at the current moment, namely the low-orbit satellite which can be tracked by the antenna array surface at the current moment. The communication switching system of the low-orbit satellite provided by the embodiment of the application can be applied to a low-orbit satellite constellation, the number of in-orbit low-orbit satellites in the low-orbit satellite constellation is large, most of the in-orbit low-orbit satellites are not in a visible range of the current geographic position, and namely, the antenna array surface cannot track the low-orbit satellites. Therefore, in the embodiment of the present application, when determining the second overhead satellite to be tracked by the second antenna array 04, the second overhead satellite may be determined from the current candidate overhead satellites. For example, there may be 864 low-orbit satellites in the low-orbit satellite constellation, and 20 of the 864 low-orbit satellites are in the visible range of the current geographic location at the current time, so the master control device 01 may determine the second over-top satellite from the 20 low-orbit satellites.
The first preset condition may be a predetermined condition that indicates that the communication network of the current channel is about to be disconnected, that is, a condition that the first signal strength parameter is about to disappear. For example, when the main control device 01 determines that the first signal strength parameter satisfies the first preset condition, a switching instruction may be sent to the electronic switch 02, and the electronic switch 02 may switch the current channel (the channel of the first antenna array 03) to the channel of the second antenna array 04 according to the switching instruction.
Optionally, the first preset condition may be that a parameter value of the first signal strength parameter is less than or equal to a first preset parameter value; the main control device 01 is specifically configured to: determining that a parameter value of a first signal strength parameter is less than or equal to a second preset parameter value before determining a second overhead satellite from the current candidate overhead satellites according to a relative position parameter between the position of the current candidate overhead satellite and the current geographic position; the second preset parameter value is greater than the first preset parameter value.
The first preset parameter value and the second preset parameter value may be predetermined parameter values, and illustratively, the first preset parameter value may be an AGC value =5, and the second preset parameter value may be an AGC value =7.
In the embodiment of the present application, since the position of the current candidate overhead satellite is also continuously updated, if the main control device 01 determines the second overhead satellite from the current candidate overhead satellite too early, the following situations may occur: after the channel of the first antenna array plane 03 is switched to the channel of the second antenna array plane 04, the network quality of the channel of the second antenna array plane 04 is rapidly deteriorated, so that frequent channel switching is required. Therefore, in order to reduce the number of times of switching channels as much as possible, in this embodiment of the application, the main control device 01 may determine the second satellite passing through the top from the current candidate satellites after determining that the parameter value of the first signal strength parameter is less than or equal to the second preset parameter value, as long as it is ensured that the second antenna array 04 successfully tracks the second satellite passing through the top during the period when the parameter value of the first signal strength parameter is reduced from the second preset parameter value to the first preset parameter value, and network delay caused by switching the satellite tracked by the second antenna array 04 by the servo system is avoided.
Optionally, in a possible implementation manner, the relative position parameter may be an off-axis angle of the position of the current candidate overhead satellite relative to the current geographic position; the off-axis angle is an included angle between the first line segment and a first coordinate axis in a preset three-dimensional coordinate system; the first line segment is a connecting line between the position of the current candidate overhead satellite and the current geographic position; the method comprises the steps that a coordinate origin of a three-dimensional coordinate system is preset as a current geographic position, the positive direction of a first coordinate axis is vertical to a ground plane and upwards, the positive direction of a second coordinate axis in the three-dimensional coordinate system is a geographic true south direction, and the positive direction of a third coordinate axis in the three-dimensional coordinate system is a geographic true east direction; the main control device 01 is specifically configured to: and in the process of monitoring the first signal strength parameter, determining the over-top satellite with the smallest off-axis angle relative to the current geographic position in the current candidate over-top satellites as a second over-top satellite.
Illustratively, referring to fig. 2, a schematic diagram of coordinates of a predetermined three-dimensional coordinate system is provided. As shown in fig. 2, the z axis is a first coordinate axis, and a positive direction of the first coordinate axis is perpendicular to the ground plane and faces upwards; the x axis is a second coordinate axis, and the positive direction of the second coordinate axis is the geographical south alignment direction; the y axis is a third coordinate axis, the positive direction of the third coordinate axis is the geographical east-righting direction, the point O represents the current geographical position, the point M represents the current candidate position of the overhead satellite, and the point OM represents a first line segment, so that the off-axis angle of the current candidate position of the overhead satellite relative to the current geographical position is ^ alpha in fig. 2.
In the embodiment of the application, any current candidate overhead satellite is determined as the second overhead satellite, so that network delay caused by switching the satellite tracked by the antenna array by the servo system can be avoided. However, different candidate overhead satellites have different connectable durations with the second antenna array 04, the smaller the off-axis angle the longer the connectable time. Therefore, to further reduce the number of times of switching channels, the over-top satellite with the smallest off-axis angle relative to the current geographical position in the current candidate over-top satellites may be determined as the second over-top satellite, thereby maximizing the connectable duration of the second over-top satellite with the second antenna array 04.
Optionally, the main control device 01 is further configured to: and updating the candidate overhead satellites once at preset intervals according to the off-axis angles of the positions of the satellites in the low-orbit satellite constellation relative to the current geographic position.
The preset time period may be a predetermined time period, for example, the preset time period may be 0.2 seconds.
Since the positions of the low-orbit satellites are constantly changed, the low-orbit satellites in the visible range of the current geographic position at different times are different, and therefore in the embodiment of the application, the candidate overhead satellites can be periodically updated to ensure that the finally determined second overhead satellite is in the visible range of the current geographic position.
Optionally, the main control device 01 is specifically configured to: determining the target satellite as a candidate overhead satellite under the condition that the off-axis angle of the position of the target satellite relative to the current geographic position is larger than a preset angle; the target satellite is any satellite in a low earth orbit satellite constellation.
The preset angle may be a predetermined angle, and for example, the preset angle may be 53 °, that is, in a case that the off-axis angle of the position of the target satellite relative to the current geographic position is greater than 53 °, the target satellite is located in the visible range of the current geographic position.
Optionally, the main control device 01 is further configured to: monitoring a second signal strength parameter between the second antenna array 04 and the second overhead satellite after switching the current channel to the channel of the second antenna array 04 by controlling the electronic switch 02; in the process of monitoring the second signal intensity parameter, according to the relative position parameter of the position of the current candidate overhead satellite and the current geographic position, a third overhead satellite is determined from the current candidate overhead satellite, and the first antenna array surface 03 is controlled to track the third overhead satellite; then, under the condition that it is determined that the second signal strength parameter satisfies the first preset condition, the current channel is switched to the channel of the first antenna array plane 03 by controlling the electronic switch 02.
In the embodiment of the present application, the channels of the first antenna array plane 03 and the second antenna array plane 04 may be alternately switched through the electronic switch 02, when the channel of the first antenna array plane 03 is used, the overhead satellite tracked by the second antenna array plane 04 may be switched through the servo system, and because the channel used at this time is the channel of the first antenna array plane 03, the network delay is not caused by the switching of the overhead satellite tracked by the second antenna array plane 04 by the servo system. When the network quality of the channel of the first antenna array face 03 is deteriorated, the channel of the first antenna array face 03 is switched to the channel of the second antenna array face 04, and then the overhead satellite tracked by the first antenna array face 03 is switched through the servo system, the used channel is the channel of the second antenna array face 04, and the network delay is not brought by the servo system for switching the overhead satellite tracked by the first antenna array face 03. Therefore, the technical scheme provided by the embodiment of the application can avoid network delay caused by switching the satellite tracked by the antenna array surface by the servo system.
Alternatively, the servo system may be composed of a servo motor and a servo controller. As shown in fig. 3, the communication switching system of the low earth orbit satellite provided in fig. 1 may further include: a first servo motor 05, a first servo controller 07, a second servo motor 06, and a second servo controller 08; the first servo motor 05 is respectively connected with the first antenna array surface 03 and the first servo controller 07, and the second servo motor 06 is respectively connected with the second antenna array surface 04 and the second servo controller 08; the first servo controller 07 is connected to the main control device 01 and the electronic switch 02 through a first external interface 09, and the second servo controller 08 is connected to the main control device 01 and the electronic switch 02 through a second external interface 10.
The main control device 01 is further configured to: before monitoring a first signal intensity parameter between a first antenna array face 03 and a first overhead satellite tracked by the first antenna array face 03, determining the first overhead satellite from current candidate overhead satellites, and sending a first control signal to a first servo controller 07 through a first external interface 09; the first control signal is used for indicating the first servo controller 07 to control the first servo motor 05 to start, so that the first servo motor 05 drives the first antenna array surface 03 to rotate until the first overhead satellite is tracked;
the main control device 01 is specifically configured to: after determining a second overhead satellite from the current candidate overhead satellites, sending a second control signal to the second servo controller 08 through the second external interface 10; the second control signal is used to instruct the second servo controller 08 to control the second servo motor 06 to start, so that the second servo motor 06 drives the second antenna array 04 to rotate until the second overhead satellite is tracked.
Optionally, the communication switching system for a low earth orbit satellite provided in the embodiment of the present application may further include: a first tracker and a second tracker; the first tracking machine is used for acquiring signal intensity parameters between the first antenna array face 03 and the overhead satellite tracked by the first antenna array face 03; and the second tracker is used for acquiring the signal strength parameter between the second antenna array 04 and the overhead satellite tracked by the second antenna array 04.
In practical applications of the embodiment of the present application, the first tracker and the second tracker do not directly acquire the signal strength parameter, but indirectly acquire the signal strength parameter through a receiving channel, a power divider, and other devices in a communication switching system of the low-orbit satellite. By way of example, with reference to fig. 4, a schematic diagram of a possible architecture of a communication switching system for low earth orbit satellites is provided. As shown in fig. 4, the communication switching system of the low earth orbit satellite includes a first outdoor unit, a second outdoor unit and an indoor unit. The first indoor unit comprises a main control device 01, an electronic switch 02, a baseband, a switch and a router, and the main control device 01 can transmit signals with the baseband. The first outdoor unit and the second outdoor unit have the same internal devices, the first outdoor unit includes a first antenna array 03, a first transmitting channel, a first receiving channel, a first power divider, a first tracker 11, a first servo motor 05, and a first servo controller 07, and the first transmitting channel, the first power divider, the first tracker 11, and the first servo controller 07 can transmit signals with the devices in the indoor unit through a first external interface 09. The second outdoor unit includes a second antenna array 04, a second transmitting channel, a second receiving channel, a second power divider, a second tracker 12, a second servo motor 06, and a second servo controller 08, and the second transmitting channel, the second power divider, the second tracker 12, and the second servo controller 08 can perform signal transmission with the devices in the indoor unit through the second external interface 10.
The power amplifier of the first transmitting channel receives the intermediate frequency signal of the baseband through the first external interface 09, then can filter and amplify the intermediate frequency signal for multiple times, then performs frequency mixing with a local oscillator to output the required frequency for transmitting, performs filtering and driving amplification, performs power amplification through a final-stage K-band power amplifier, and finally outputs the transmitting signal to the first antenna array surface 03. After receiving an input signal from the first antenna array plane 03, the channel low noise amplifier of the first receiving channel performs low noise amplification and filtering, performs frequency mixing with a local oscillator to output and receive a required intermediate frequency, and provides the intermediate frequency to a baseband through the first external interface 09 after performing multiple filtering amplification of the first power divider to realize signal demodulation. The first tracker 11 may obtain the signal strength parameter from the first power divider, perform filtering, difference processing, and the like on the signal strength parameter, and then convert the radio frequency signal into bitstream data by using a zero intermediate frequency technique, and at the same time convert the signal amplitude information into a voltage signal via a digital-to-analog converter, and then provide the voltage signal to the indoor unit through the first external interface 09. Similarly, the working principle of each device in the second outdoor unit may refer to the working principle of each device in the first outdoor unit, and the embodiments of the present application are not described herein again.
In addition, the baseband can not only realize the switching and modulation and demodulation of signals, but also complete the connection of equipment such as a user router and the like through an exchanger, thereby providing a network for users.
In summary, the communication switching system for low earth orbit satellites provided by the embodiment of the present application may include a first antenna array, a second antenna array, an electronic switch, and a main control device. When the first antenna array surface tracks the first overhead satellite and the current channel is the channel of the first antenna array surface, the main control device may monitor the signal quality (i.e., the first signal strength parameter) of the current channel, determine the second overhead satellite from the current candidate overhead satellites in the monitoring process, and control the second antenna array surface to track the second overhead satellite. In the process that the first antenna array surface tracks the first overhead satellite, the signal quality of the channel of the first antenna array surface gradually weakens until the first antenna array surface disappears, and the main control device can control the electronic switch to switch the current channel into the channel of the second antenna array surface before the signal quality disappears (namely, when the first signal strength parameter meets a first preset condition). Since the second antenna array has already been tracked to the second overhead satellite in advance before switching channels, the time delay caused by switching the satellite tracked by the second antenna array through a servo system can be avoided. It can be seen that in the technical scheme provided by the application, the satellite over the top is tracked through the two antenna arrays, and the channels of the two antenna arrays are switched through the electronic switch, so that the network delay caused by switching the satellite tracked by the antenna arrays through the servo system can be avoided, and the experience of a user in using the network can be improved.
It should be noted that, in the embodiment of the present application, the time delay of the network communication is only generated by the switching time delay of the electronic switch, and the switching time delay of the electronic switch is smaller than the switching time delay of the servo system, so that the embodiment of the present application can reduce the network communication time delay in the low-rail communication application, and thus can improve the experience of a user using a network.
The communication switching method of the low-orbit satellite provided by the embodiment of the application can be suitable for a communication switching system of the low-orbit satellite. The communication handover method for the low-earth-orbit satellite according to the embodiment of the present application will be described in detail below.
Referring to fig. 5, a communication handover method for a low earth orbit satellite according to an embodiment of the present application includes S501 to S502:
s501, monitoring a first signal intensity parameter between the first antenna array surface and a first overhead satellite tracked by the first antenna array surface by the main control equipment under the condition that the current channel is the channel of the first antenna array surface.
S502, in the process of monitoring the first signal strength parameter, the main control equipment determines a second overhead satellite from the current candidate overhead satellite according to the relative position parameter of the position of the current candidate overhead satellite and the current geographic position, and controls a second antenna array to track the second overhead satellite; and then, under the condition that the first signal strength parameter is determined to meet a first preset condition, switching the current channel to the channel of the second antenna array by controlling the electronic switch.
Optionally, in a possible implementation manner, the relative position parameter is an off-axis angle of the position of the current candidate overhead satellite relative to the current geographic position; the off-axis angle is an included angle between the first line segment and a first coordinate axis in a preset three-dimensional coordinate system; the first line segment is a connecting line between the position of the current candidate overhead satellite and the current geographic position; the method comprises the steps that a coordinate origin of a preset three-dimensional coordinate system is a current geographic position, the positive direction of a first coordinate axis is vertical to a ground plane and faces upwards, the positive direction of a second coordinate axis in the preset three-dimensional coordinate system is a geographic southward direction, and the positive direction of a third coordinate axis in the preset three-dimensional coordinate system is a geographic east-ward direction; the "determining a second overhead satellite from the current candidate overhead satellite according to the relative position parameter between the position of the current candidate overhead satellite and the current geographic position" may include: and determining the over-top satellite with the smallest off-axis angle relative to the current geographic position in the current candidate over-top satellites as a second over-top satellite.
Optionally, in another possible implementation manner, the communication handover method for a low earth orbit satellite provided by the present application may further include: and updating the candidate overhead satellites once at preset intervals according to the off-axis angles of the positions of the satellites in the low-orbit satellite constellation relative to the current geographic position.
Optionally, in another possible implementation manner, the "updating the candidate overhead satellite once at preset intervals according to the off-axis angle of the position of each satellite in the low-earth satellite constellation relative to the current geographic position" may include: determining the target satellite as a candidate overhead satellite under the condition that the off-axis angle of the position of the target satellite relative to the current geographic position is larger than a preset angle; the target satellite is any satellite in a low earth orbit satellite constellation.
Optionally, in another possible design manner, the first preset condition is that the parameter value is less than or equal to a first preset parameter value; the "determining a second overhead satellite from the current candidate overhead satellite according to the relative position parameter between the position of the current candidate overhead satellite and the current geographic position" may include: under the condition that the parameter value of the first signal strength parameter is determined to be smaller than or equal to a second preset parameter value, determining a second overhead satellite from the current candidate overhead satellites according to the relative position parameter between the position of the current candidate overhead satellite and the current geographic position; the second preset parameter value is greater than the first preset parameter value.
Optionally, in another possible design, after "switching the current channel to the channel of the second antenna array by controlling the electronic switch", the method may further include: monitoring a second signal strength parameter between the second antenna array and the second over-the-top satellite; in the process of monitoring the second signal intensity parameter, determining a third overhead satellite from the current candidate overhead satellite according to the relative position parameter of the position of the current candidate overhead satellite and the current geographic position, and controlling the first antenna array to track the third overhead satellite; and then, under the condition that the second signal strength parameter is determined to meet the first preset condition, switching the current channel to the channel of the first antenna array by controlling the electronic switch.
Optionally, in another possible design, before the monitoring the first signal strength parameter between the first antenna array surface and the first over-the-top satellite tracked by the first antenna array surface, the method may further include: determining a first overhead satellite from the current candidate overhead satellites, and sending a first control signal to a first servo controller through a first external interface; the first control signal is used for indicating the first servo controller to control the first servo motor to start, so that the first servo motor drives the first antenna array surface to rotate until the first overhead satellite is tracked;
after the "determining the second overhead satellite from the current candidate overhead satellites" is performed, the method may further include: sending a second control signal to a second servo controller through a second external interface; the second control signal is used for indicating the second servo controller to control the second servo motor to start, so that the second servo motor drives the second antenna array surface to rotate until the second overhead satellite is tracked.
For the explanation of the related contents in this embodiment, reference may be made to the above-mentioned embodiment of the communication switching system for low earth orbit satellites, and details are not repeated here.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A communication switching system of a low earth orbit satellite is characterized by at least comprising a main control device, an electronic switch, a first antenna array surface and a second antenna array surface;
the master control device is configured to: monitoring a first signal strength parameter between the first antenna array surface and a first overhead satellite tracked by the first antenna array surface under the condition that the current channel is the channel of the first antenna array surface;
in the process of monitoring the first signal strength parameter, determining a second overhead satellite from the current candidate overhead satellite according to the relative position parameter of the position of the current candidate overhead satellite and the current geographic position, and controlling the second antenna array to track the second overhead satellite; and then, under the condition that the first signal intensity parameter is determined to meet a first preset condition, the current channel is switched to the channel of the second antenna array by controlling the electronic switch.
2. The system of claim 1, wherein the relative position parameter is an off-axis angle of a current candidate over-the-top satellite position relative to the current geographic position; the off-axis angle is an included angle between the first line segment and a first coordinate axis in a preset three-dimensional coordinate system; the first line segment is a connecting line between the position of the current candidate overhead satellite and the current geographic position; the coordinate origin of the preset three-dimensional coordinate system is the current geographic position, the positive direction of the first coordinate axis is vertical to the ground plane and faces upwards, the positive direction of the second coordinate axis in the preset three-dimensional coordinate system is the geographic southward direction, and the positive direction of the third coordinate axis in the preset three-dimensional coordinate system is the geographic eastward direction;
the master control device is specifically configured to:
determining the over-top satellite with the smallest off-axis angle relative to the current geographic position in current candidate over-top satellites as the second over-top satellite in the process of monitoring the first signal strength parameter.
3. The low earth orbit satellite communication switching system of claim 2, wherein the master control device is further configured to:
and updating the candidate overhead satellite once at intervals of preset time according to the off-axis angle of the position of each satellite in the low-orbit satellite constellation relative to the current geographic position.
4. The low earth orbit satellite communication switching system of claim 3, wherein the master control device is specifically configured to:
determining a target satellite as the candidate over-the-top satellite when the off-axis angle of the position of the target satellite relative to the current geographic position is determined to be greater than a preset angle; the target satellite is any one of the low earth orbit satellite constellations.
5. The communication switching system for low earth orbit satellites as claimed in claim 1, wherein the first predetermined condition is that the parameter value is less than or equal to a first predetermined parameter value; the master control device is specifically configured to:
determining that the parameter value of the first signal strength parameter is less than or equal to a second preset parameter value before determining a second overhead satellite from the current candidate overhead satellites according to the relative position parameter of the current candidate overhead satellites and the current geographic position; the second preset parameter value is larger than the first preset parameter value.
6. The communication switching system for low earth orbit satellites of claim 1 wherein the master control device is further configured to:
monitoring a second signal strength parameter between the second antenna array and the second over-the-top satellite after said switching the current channel to the channel of the second antenna array by controlling the electronic switch;
in the process of monitoring the second signal strength parameter, determining a third overhead satellite from the current candidate overhead satellite according to the position of the current candidate overhead satellite and the relative position parameter of the current geographic position, and controlling the first antenna array to track the third overhead satellite; and then, under the condition that the second signal strength parameter is determined to meet the first preset condition, switching the current channel to the channel of the first antenna array by controlling the electronic switch.
7. The system for communication switching of low earth orbit satellites of claim 1 further comprising: the servo control system comprises a first servo motor, a first servo controller, a second servo motor and a second servo controller; the first servo motor is respectively connected with the first antenna array surface and the first servo controller, and the second servo motor is respectively connected with the second antenna array surface and the second servo controller; the first servo controller is respectively connected with the main control equipment and the electronic switch through a first external interface, and the second servo controller is respectively connected with the main control equipment and the electronic switch through a second external interface;
the master control device is further configured to: before monitoring a first signal strength parameter between the first antenna array face and a first overhead satellite tracked by the first antenna array face, determining the first overhead satellite from current candidate overhead satellites, and sending a first control signal to the first servo controller through the first external interface; the first control signal is used for indicating the first servo controller to control the first servo motor to start, so that the first servo motor drives the first antenna array surface to rotate until the first overhead satellite is tracked;
the master control device is specifically configured to: after a second overhead satellite is determined from the current candidate overhead satellites, sending a second control signal to the second servo controller through the second external interface; the second control signal is used for indicating the second servo controller to control the second servo motor to start, so that the second servo motor drives the second antenna array surface to rotate until the second overhead satellite is tracked.
8. The communication switching system for a low earth orbit satellite of claim 1, wherein the system further comprises: a first tracker and a second tracker; the first tracker is used for acquiring a signal intensity parameter between the first antenna array face and an overhead satellite tracked by the first antenna array face; the second tracker is configured to obtain a signal strength parameter between the second antenna array and an over-the-top satellite tracked by the second antenna array.
9. A communication switching method for a low earth orbit satellite, which is applied to the communication switching system for a low earth orbit satellite according to any one of claims 1 to 8, comprising:
the method comprises the steps that under the condition that a current channel is a channel of a first antenna array face, a main control device monitors a first signal intensity parameter between the first antenna array face and a first overhead satellite tracked by the first antenna array face;
the main control equipment determines a second overhead satellite from the current candidate overhead satellites according to the relative position parameter of the position of the current candidate overhead satellite and the current geographic position in the process of monitoring the first signal strength parameter, and controls a second antenna array to track the second overhead satellite; and then, under the condition that the first signal intensity parameter is determined to meet a first preset condition, switching the current channel to the channel of the second antenna array by controlling an electronic switch.
10. The method of claim 9, wherein the relative position parameter is an off-axis angle of a current candidate over-the-top satellite position relative to the current geographic position; the off-axis angle is an included angle between the first line segment and a first coordinate axis in a preset three-dimensional coordinate system; the first line segment is a connecting line between the position of the current candidate overhead satellite and the current geographic position; the coordinate origin of the preset three-dimensional coordinate system is the current geographic position, the positive direction of the first coordinate axis is vertical to the ground plane and faces upwards, the positive direction of the second coordinate axis in the preset three-dimensional coordinate system is the geographic southward direction, and the positive direction of the third coordinate axis in the preset three-dimensional coordinate system is the geographic eastward direction;
the determining a second overhead satellite from the current candidate overhead satellite according to the relative position parameter between the position of the current candidate overhead satellite and the current geographic position includes:
determining an over-top satellite with the smallest off-axis angle relative to the current geographic location from among current candidate over-top satellites as the second over-top satellite.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116743224A (en) * | 2023-08-09 | 2023-09-12 | 西安欣创电子技术有限公司 | Satellite automatic tracking method, satellite tracking system and satellite tracking device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116743224A (en) * | 2023-08-09 | 2023-09-12 | 西安欣创电子技术有限公司 | Satellite automatic tracking method, satellite tracking system and satellite tracking device |
| CN116743224B (en) * | 2023-08-09 | 2023-11-24 | 西安欣创电子技术有限公司 | Satellite automatic tracking method, satellite tracking system and satellite tracking device |
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