CN111585633B - Aircraft platform and networking method thereof - Google Patents
Aircraft platform and networking method thereof Download PDFInfo
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- CN111585633B CN111585633B CN202010220429.7A CN202010220429A CN111585633B CN 111585633 B CN111585633 B CN 111585633B CN 202010220429 A CN202010220429 A CN 202010220429A CN 111585633 B CN111585633 B CN 111585633B
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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
- H04B7/18502—Airborne stations
- H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
- H04B7/0604—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching with predefined switching scheme
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
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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]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
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Abstract
The invention provides an aircraft platform and a networking method thereof, wherein a set of antenna groups are respectively arranged at the front end and the rear end of the aircraft platform, and only one set of antenna group works in the two sets of antenna groups at the same time; each set of antenna group comprises two antennas with different directions, all the antennas have the same antenna beam angle, only one antenna in the two antennas of the same set of antenna group is in a working state at the same moment, and by switching among the antennas, a wider range can be covered, and the anti-interference capability in the networking process is improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an aircraft platform and a networking method of the aircraft platform.
Background
In the modern air-space integrated battlefield background, wireless communication is used as an effective means for information interaction among various combat units and plays an irreplaceable role in a military data chain. For example, the TTNT tactical targeting network technology in the United states has multi-platform dynamic networking capability as a weapon data chain, and the Ad-hoc wireless network structure is adopted to connect each node with a central node, so that the TTNT tactical targeting network technology has the characteristics of high transmission rate and large capacity.
With the development of intellectualization and scale of a combat unit, a High speed vehicle platform (High speed vehicle) has wide combat radius and large action scale, and not only needs a front-end vehicle and a rear-end High speed vehicle as an intermediary to communicate with a command center, but also needs two-by-two communication among the vehicle platforms.
Due to the presence of interfering signals in wireless channel transmissions and the selectively debilitating nature of the channels, interference-resistant measures are required for communications between high-speed aircraft platforms. In the process of high-speed flight, the flight attitude of the platform can change frequently, and the networking process of working by a single antenna faces the risk of being incapable of receiving effective signals.
Disclosure of Invention
Embodiments of the present invention provide an aircraft platform and a method of networking an aircraft platform that overcome, or at least partially address, the above-mentioned problems.
In a first aspect, an embodiment of the present invention provides an aircraft platform, where a set of antenna groups is respectively disposed at front and rear ends of the aircraft platform, and only one of the two sets of antenna groups works at the same time;
each set of antenna group comprises two antennas with different positions, all the antennas have the same antenna beam angle, and only one of the two antennas of the same set of antenna group is in a working state at the same time.
Optionally, the antenna satisfies the following condition:
the beam angle azimuth of the antenna is not less than 30 degrees, and the pitch angle comprises-15 degrees to 30 degrees;
the equivalent omnidirectional radiation power output by the antenna is not less than 30dBm, and the adjustable range is as follows: 0-60 dB, stepping is 1 dB;
acceptable doppler dynamic range: 300 KHz.
In a second aspect, an embodiment of the present invention provides a networking method for the above aircraft platform, where in the networking process of two aircraft platforms, the two aircraft platforms both communicate in a time division multiplexing manner:
for an aircraft platform serving as a front networking node, firstly entering a sending time slot to send a handshake frame, starting from the first time of switching to a receiving time slot, if the handshake frame from a rear networking node is received at the current receiving time slot, sending a data frame after the next time of switching to the sending time slot, and successfully networking the front networking node and the rear networking node;
for an aircraft platform serving as a rear networking node, firstly entering and maintaining a time slot until a handshake frame from a front networking node is received for the first time, directly entering a sending time slot and sending the handshake frame after the handshake frame is received, and successfully networking the front networking node and the rear networking node; the time length of the sending time slot is the same as that of the receiving time slot.
Furthermore, the front networking node firstly enters a sending time slot and then enters a receiving time slot, and the process is repeated until networking is successful;
furthermore, the rear networking node firstly enters a receiving time slot, and immediately enters a sending time slot after receiving the handshake frame from the front networking node, so that the receiving and sending time slots between the two nodes are ensured to be synchronous.
Optionally, the two aircraft platforms specifically adopt an antenna switching mode to perform rapid networking;
wherein, for the aircraft platform as the former networking node, the antenna that works when the networking process is started is used as the first antenna, another antenna is used as the second antenna, and the switching sequence is as follows: the first antenna, the second antenna and the first antenna are circulated until the switching process is stopped at the antenna which is successfully networked;
for the aircraft platform as the post-networking node, the antenna working at the beginning of the networking process is used as a third antenna, the other antenna is used as a fourth antenna, and the switching sequence is as follows: and the third antenna, the fourth antenna and the fourth antenna are circulated until the switching process is stopped at the antenna which is successfully networked.
Optionally, after the networking of the front networking node and the rear networking node is successful, for an aircraft platform serving as the rear networking node, if no frame synchronization signal is detected in more than one time slot, switching an antenna group of the rear networking node according to a preset broken link reconstruction rule to restore the networking.
Optionally, the broken link reestablishment rule specifically includes:
switching the working antenna to another antenna of the same antenna group, then sending a frame synchronization signal through the switched antenna, and transferring to a receiving time slot;
if the frame synchronization signal is received in the time slot, the networking is recovered; and if the frame synchronization signal is not received in the receiving time slot, inquiring the antenna switching times in the broken link reconstruction process, if the switching times do not exceed the preset times, switching the working antenna to another antenna of the same antenna group, and if the switching times exceed the preset times, re-networking.
Optionally, for an aircraft platform as a front networking node, starting from the first transfer-to-receive time slot, the method further includes: and if the handshake frame from the rear networking node is not received in the current time slot, continuing to send the handshake frame after the next transfer time slot.
Optionally, the handshake frame structure includes a protection time period, a pilot band, a frame header segment, a transmission holding segment, and a volume trailer segment;
the data frame structure comprises a protection time period, a pilot frequency period, a frame head section, a frame data section, a frame number section, a reserved data section and a volume tail section;
the duration lengths of the handshake frame structure and the data frame structure are the same as the duration of the sending time slot, and the positions of the frame head sections in the handshake frame and the data frame are different.
Optionally, when a data frame occurs, the front networking node and the back networking node accumulate frame numbers in the frame number segment from 1 frame by frame.
According to the aircraft platform and the networking method of the aircraft platform provided by the embodiment of the invention, the antenna groups are arranged at the front end and the rear end of the aircraft platform, so that the relative positions of the aircraft platforms can be networked without limitation, and by arranging two antennas for each antenna group, a wider range can be covered, and the anti-interference capability in the networking process is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an aircraft platform according to an embodiment of the invention;
fig. 2 is a schematic diagram of a first case of antenna switching according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a second case of antenna switching according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a third case of antenna switching according to the embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a fourth situation of antenna switching according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a fifth case of antenna switching according to the embodiment of the present invention;
fig. 7 is a schematic diagram of a sixth case of antenna switching according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The front end and the rear end of the aircraft platform are respectively provided with a set of antenna groups, and only one set of antenna group works in the two sets of antenna groups at the same time;
each set of antenna group comprises two antennas with different positions, all the antennas have the same antenna beam angle, and only one of the two antennas of the same set of antenna group is in a working state at the same time.
The aircraft platform can be a missile, and the application scene of the embodiment of the invention can be understood as the process of a plurality of missiles in hitting a certain target or certain targets for communication. Fig. 1 is a schematic structural diagram of an aircraft platform according to an embodiment of the present invention, and as shown in fig. 1, two antennas of each antenna group are represented by an antenna a and an antenna B. Because a plurality of missiles have a sequential relation in the flying process, the front end and the rear end of each aircraft platform are respectively provided with one antenna group, so that one aircraft platform can communicate with the other aircraft platform when being closer to a target relative to the other aircraft platform, and one aircraft platform can communicate with the other aircraft platform when being farther away from the target relative to the other aircraft platform. In the embodiment of the present invention, the precedence relationship between two aircraft platforms is determined in advance in practical application, and since the antenna group at the rear end of the previous aircraft platform is more suitable for communicating with the antenna group at the front end of the following aircraft platform, the embodiment of the present invention defines: when the antenna group at the front end works, the aircraft platform serves as a rear networking node, and when the antenna group at the rear end works, the aircraft platform serves as a front networking node. If an aircraft only has one antenna in front of and behind the aircraft, the two antennas are only connected, but because the attitude of the aircraft changes in the high-speed flight process, the beam direction of a single antenna is limited, or because interference exists in a certain direction, the connection is likely to be interrupted, so that the two antennas are arranged for each antenna group in the embodiment of the invention.
On the basis of the above embodiments, the parameters of the antenna of the embodiments of the present invention are as follows:
the beam angle azimuth of the antenna is not less than 30 degrees, and the pitch angle comprises-15 degrees to 30 degrees;
the EIRP of the antenna output is not less than 30dBm, and the adjustable range is as follows: 0-60 dB, stepping is 1 dB;
acceptable doppler dynamic range: 300 KHz.
On the basis of the above embodiment, the embodiment of the invention also provides a networking method for the aircraft platform.
In the networking process of the two aircraft platforms, the two aircraft platforms are communicated in a time division multiplexing mode. When the current networking node is in the sending time slot, the later networking node is in the receiving time slot; when the rear networking node is in the sending time slot, the front networking node is in the receiving time slot.
For an aircraft platform serving as a front networking node, firstly entering a sending time slot to send a handshake frame, then entering a receiving time slot, repeating the process until networking is successful, specifically, starting from the first time of transferring to the receiving time slot, if the handshake frame from a rear networking node is received in the current receiving time slot, sending a data frame after transferring to the sending time slot next time, and successfully networking the front networking node and the rear networking node.
For an aircraft platform serving as a rear networking node, firstly entering and maintaining a time slot until a handshake frame from a front networking node is received for the first time, directly entering a sending time slot and sending the handshake frame after the handshake frame is received, and successfully networking the front networking node and the rear networking node; the time length of the sending time slot is the same as that of the receiving time slot.
It should be noted that, in the embodiment of the present invention, the front networking node first enters the sending time slot to send the handshake frame, the rear networking node first enters the receiving time slot to wait for receiving the handshake frame, and the rear networking node is always in the receiving time slot before receiving the handshake frame, when the rear networking node receives the handshake frame, it immediately enters the sending time slot to ensure that the receiving and sending time slots of the two nodes are synchronous, and sends a new handshake frame generated by the rear networking node to the front networking node. And then the networking node enters the receiving time slot again after sending the handshake frame, and if the rear networking node receives the data frame sent by the front networking node, the rear networking node sends a new data frame to the front networking node after entering the sending time slot, so that the data transmission is realized.
It can be understood that the frame synchronization signal includes a handshake frame and a data frame, where different nodes have different frame synchronization signals in different receive time slots, and the previous networking node switches to the receive time slot for the first time in the above embodiment, and if the handshake frame is received, the handshake frame is the frame synchronization signal, and since the subsequent networking node receives only the data frame before the receive time slot, the data frame is the frame synchronization signal.
On the basis of the above embodiment, the work flow of the aircraft platform as the front networking node may also be expressed as:
entering a sending time slot to send a handshake frame;
entering a receiving time slot after the handshake frame is sent, and receiving a frame synchronization signal;
if the frame synchronization signal is not received, switching to a sending time slot after the current time slot is finished, and continuously sending a handshake frame;
and if the frame synchronization signal is received, switching to a sending time slot after the current time slot is ended, and sending the data frame.
The workflow of an aircraft platform as a post-networking node may also be expressed as:
entering a receiving time slot until a handshake frame is received;
entering a sending time slot after receiving a handshake frame, and sending the handshake frame;
and entering a receiving time slot after sending the handshake frame, if receiving the data frame in the receiving time slot, switching to a sending time slot, and sending a new data frame to the front networking node.
On the basis of the above embodiments, as an optional embodiment, the two aircraft platforms specifically adopt a specific antenna switching mode to perform fast networking;
wherein, for the aircraft platform as the former networking node, the antenna that works when the networking process is started is used as the first antenna, another antenna is used as the second antenna, and the switching sequence is as follows: the first antenna, the second antenna and the first antenna are circulated until the switching process is stopped at the antenna which is successfully networked;
for the aircraft platform as the post-networking node, the antenna working at the beginning of the networking process is used as a third antenna, the other antenna is used as a fourth antenna, and the switching sequence is as follows: and the third antenna, the fourth antenna and the fourth antenna are circulated until the switching process is stopped at the antenna which is successfully networked.
On the basis of the above embodiments, several typical networking examples are given in the embodiments of the present invention, in the following examples, the time duration of the transmission time slot and the time duration of the reception time slot are both 0.5s, and for the purpose of simplicity and easy understanding, two antennas of one set of antenna groups are referred to as an antenna a and an antenna B. Fig. 2 is a schematic diagram of a first case of antenna switching according to an embodiment of the present invention, in which an a antenna of a front networking node and an a antenna of a rear networking node may be networked, and a frame synchronization signal is received in a first frame.
As shown in fig. 2, in the antenna switching process, the current networking node is switched to the antenna a for the first time according to the ABBA sequence to perform the transmission time slot, and the back networking node is in the receiving time slot of the antenna a according to the AABB sequence, but due to the transmission delay existing between the front networking node and the back networking node, the difference of the starting time may cause the receiving time slot of the back networking node not to cover the transmission time slot of the whole front networking node, and may miss the frame synchronization signal.
When the receiving time slot of the rear networking node antenna A receives the handshake frame structure sent by the front networking node antenna A, the rear networking node antenna A switches into the sending time slot to send the handshake frame structure to the front networking node, the front networking node antenna A successfully networks after receiving, the sending frame structure between the two nodes is switched into a data frame for communication, and the time for the networking establishment process is 1 s.
Fig. 3 is a schematic diagram of a second case of antenna switching provided by the embodiment of the present invention, in which the a antenna of the front networking node and the a antenna of the rear networking node can be networked, and the received frame synchronization signal is missed in the first frame. As shown in fig. 3, the receiving time slot of the rear networking node antenna a misses the handshake frame structure sent by the front networking node antenna a, according to the antenna switching strategy, when the front networking node antenna a and the rear networking node antenna a receive and send each other again, the rear networking node antenna a receives the handshake frame structure sent by the front networking node antenna a, the rear networking node antenna a switches to the sending time slot to send the handshake frame structure to the front networking node, the front networking node antenna a succeeds in networking after receiving, the sending frame structure between the two nodes is switched to a data frame for communication, and the time for the networking establishment process is 8 s.
Fig. 4 is a schematic diagram of a third case of antenna switching according to an embodiment of the present invention, where an a antenna of a front networking node and a B antenna of a rear networking node may be networked. As shown in fig. 4, in the antenna switching process, the current networking node switches to the antenna a for the second time according to the ABBA sequence to perform the transmission time slot, and the back networking node is in the AABB sequence and keeps the receiving time slot of the antenna B twice, and may cover the transmission time slot of the whole front networking node.
The antenna B of the rear networking node receives the handshake frame structure sent by the antenna A of the front networking node, the antenna B of the rear networking node is switched to send a time slot to send the handshake frame structure to the front networking node, the front networking node antenna A successfully networks after receiving, the sending frame structure between the two nodes is switched to be a data frame for communication, and the time for the networking establishment process is 4 s.
Fig. 5 is a schematic diagram of a fourth case of antenna switching according to an embodiment of the present invention, where a B antenna of a front networking node and an a antenna of a rear networking node may be networked. As shown in fig. 5, in the antenna switching process, the current networking node is switched to the antenna B for the first time according to the ABBA sequence to perform the transmission time slot, and the back networking node is in the AABB sequence and keeps the receiving time slot of the antenna a twice, and may cover the transmission time slot of the whole front networking node.
The antenna A of the rear networking node receives the handshake frame structure sent by the antenna B of the front networking node, the antenna A of the rear networking node is switched to send a time slot to send the handshake frame structure to the front networking node, the front networking node antenna B successfully networks after receiving, the sending frame structure between the two nodes is switched to be a data frame for communication, and the time for networking is 2 s.
Fig. 6 is a schematic diagram of a fifth case of antenna switching according to an embodiment of the present invention, in which a B antenna of a front networking node and a B antenna of a rear networking node may be networked, and a frame synchronization signal is received in a first frame. As shown in fig. 6, in the antenna switching process, the current networking node is switched to the antenna B for the second time according to the ABBA sequence to perform the transmission time slot, and the back networking node is in the receiving time slot of the antenna B according to the AABB sequence, but due to the transmission delay existing between the front networking node and the back networking node, the difference of the starting time may cause the receiving time slot of the back networking node not to cover the transmitting time slot of the whole front networking node, and may miss the frame synchronization signal.
When the receiving time slot of the rear networking node antenna B receives the handshake frame structure sent by the front networking node antenna B, the rear networking node antenna B switches to the sending time slot to send the handshake frame structure to the front networking node, the front networking node antenna B successfully networks after receiving, the sending frame structure between the two nodes is switched into a data frame for communication, and the time for the networking establishing process is 3 s.
Fig. 7 is a diagram illustrating a sixth scenario of antenna switching according to an embodiment of the present invention, in which a B antenna of a front networking node and a B antenna of a rear networking node may be networked, and a received frame synchronization signal is missed in a first frame. When the receiving time slot of the rear networking node antenna B misses the handshake frame structure sent by the front networking node antenna B, according to an antenna switching strategy, when the front networking node antenna B and the rear networking node antenna B receive and send the handshake frame structure sent by the front networking node antenna B again, the rear networking node antenna B switches to the sending time slot to send the handshake frame structure to the front networking node, the front networking node antenna B successfully networks after receiving, the sending frame structure between the two nodes is switched into a data frame for communication, and the time of the networking establishing process is 6 s.
In the embodiments, it can be seen that the antenna switching manner can ensure that the networking process is completed quickly within 8 s.
On the basis of the above embodiments, as an optional embodiment, after the front networking node and the rear networking node successfully perform networking, for the aircraft platform serving as the rear networking node, if no frame synchronization signal is detected in more than one time slot of receiving, the antenna group of the rear networking node is switched according to a preset broken link reconstruction rule to recover the networking.
It should be noted that, after networking between the aircraft platforms is successful, due to uncertain factors such as attitude change, environmental interference and the like, a problem of chain breakage may occur during actual working between two nodes, compared with initial node networking, in the chain breakage process, it can be considered that delay between two nodes is aligned, and antenna groups of a front networking node and a rear networking node are switched according to a chain breakage reconstruction rule, that is, networking is recovered with probability.
On the basis of the foregoing embodiments, as an optional embodiment, the broken link reconstruction rule specifically includes:
switching the working antenna to another antenna of the same antenna group, then sending a frame synchronization signal through the switched antenna, and transferring to a receiving time slot;
if the frame synchronization signal is received in the time slot, the networking is recovered;
and if the frame synchronization signal is not received in the receiving time slot, inquiring the antenna switching times in the broken link reconstruction process, if the switching times do not exceed the preset times, switching the working antenna to another antenna of the same antenna group, and if the switching times exceed the preset times, re-networking.
Specifically, if the A antenna networking is broken and the frame synchronization signal is not waited at the end of the time slot, the B antenna is switched for the first time, a frame synchronization signal is sent, and the B antenna is switched to a receiving time slot; if the B antenna receives the synchronous signal, the networking is recovered, otherwise, the B antenna is switched to the A antenna for the first time, a frame of synchronous signal is sent, and the A antenna is switched to a receiving time slot; if the antenna A receives the synchronous signal, the networking is recovered, otherwise, the antenna A is switched to the antenna B for the second time, a frame of synchronous signal is sent, and the antenna B is switched to a receiving time slot; if the B antenna receives the synchronous signal, the networking is recovered, otherwise, the B antenna is switched to the A antenna for the second time, a frame of synchronous signal is sent, and the A antenna is switched to a receiving time slot; if the antenna A receives the synchronous signal, networking is recovered, otherwise, the antenna between the two nodes is considered to be incapable of recovering the networking, and the networking needs to be started again.
If the B antenna networking is broken and the frame synchronization signal is not waited at the end of the time slot, switching to the A antenna for the first time, sending a frame synchronization signal, and switching the A antenna to a receiving time slot; if the antenna A receives the synchronous signal, the networking is recovered, otherwise, the antenna A is switched to the antenna B for the first time, a frame of synchronous signal is sent, and the antenna B is switched to a receiving time slot; if the B antenna receives the synchronous signal, the networking is recovered, otherwise, the B antenna is switched to the A antenna for the second time, a frame of synchronous signal is sent, and the A antenna is switched to a receiving time slot; if the antenna A receives the synchronous signal, the networking is recovered, otherwise, the antenna A is switched to the antenna B for the second time, a frame of synchronous signal is sent, and the antenna B is switched to a receiving time slot; if the B antenna receives the synchronous signal, networking is recovered, otherwise, the antenna between the two nodes is considered to be incapable of recovering the networking, and the networking needs to be started again.
On the basis of the above embodiments, as an optional embodiment, the handshake frame structure includes a protection period, a pilot segment, a frame header segment, a transmission hold segment, and a volume trailer segment.
As an optional embodiment, the length of the protection period of the handshake frame is 6.4ms, the length of the transmission pilot is 307.2ms, the frame head of the handshake frame contains 8 bytes, the length is 25.6ms, the transmission holding segment data is all 0, the length is 153.6ms, the length of the tail segment is 7.2ms, and the total duration is 500 ms.
The data frame structure comprises a protection time period, a pilot frequency period, a frame head section, a frame data section, a frame number section, a reserved data section and a volume tail section.
As an optional embodiment, the length of the guard period of the data frame is 6.4ms, the length of the transmission pilot is 128ms, the header of the data frame contains 8 bytes and 25.6ms, the frame data section contains 48 bytes and 307.2ms, the frame number section contains 2 bytes and 12.8ms, the reserved data section contains 2 bytes and 12.8ms, and the end-of-wrap section is 7.2ms
The duration lengths of the handshake frame structure and the data frame structure of the embodiment of the invention are the same as the time length of the transmission time slot, and the positions of the frame head sections in the handshake frame and the data frame are different. The aircraft platform can judge whether the data frame or the handshake frame is the received frame signal according to the position of the frame head section.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The networking method of the aircraft platforms is characterized in that in the networking process of the two aircraft platforms, the two aircraft platforms are communicated in a time division multiplexing mode: for an aircraft platform serving as a front networking node, firstly entering a sending time slot to send a handshake frame, starting from the first time of switching to a receiving time slot, if the handshake frame from a rear networking node is received at the current receiving time slot, sending a data frame after the next time of switching to the sending time slot, and successfully networking the front networking node and the rear networking node;
for an aircraft platform serving as a rear networking node, firstly entering and maintaining a time slot until a handshake frame from a front networking node is received for the first time, directly entering a sending time slot and sending the handshake frame after the handshake frame is received, and successfully networking the front networking node and the rear networking node; the time lengths of the sending time slot and the receiving time slot are the same;
after the front networking node and the rear networking node are successfully networked, for an aircraft platform serving as the rear networking node, if no frame synchronization signal is detected in more than one time of receiving time slot, switching an antenna group of the rear networking node according to a preset broken link reconstruction rule to restore networking;
the broken link reconstruction rule specifically comprises the following steps:
switching the working antenna to another antenna of the same antenna group, then sending a frame synchronization signal through the switched antenna, and transferring to a receiving time slot;
if the frame synchronization signal is received in the time slot, the networking is recovered; if the frame synchronization signal is not received in the receiving time slot, inquiring the switching times of the antennas in the broken link reconstruction process, if the switching times do not exceed the preset times, switching the working antennas to another antenna of the same antenna group again, and if the switching times exceed the preset times, re-networking;
the front end and the rear end of the aircraft platform are respectively provided with a set of antenna groups, and only one set of antenna group works in the two sets of antenna groups at the same time; each set of antenna group comprises two antennas with different directions, all the antennas have the same antenna beam angle, and only one of the two antennas of the same set of antenna group is in an operating state at the same time.
2. The networking method according to claim 1, wherein two aircraft platforms are networked specifically by means of antenna switching;
wherein, for the aircraft platform as the former networking node, the antenna that works when the networking process is started is used as the first antenna, another antenna is used as the second antenna, and the switching sequence is as follows: the first antenna, the second antenna and the first antenna are circulated until the switching process is stopped at the antenna which is successfully networked;
for the aircraft platform as the post-networking node, the antenna working at the beginning of the networking process is used as a third antenna, the other antenna is used as a fourth antenna, and the switching sequence is as follows: and the third antenna, the fourth antenna and the fourth antenna are circulated until the switching process is stopped at the antenna which is successfully networked.
3. The networking method according to claim 1, wherein for an aircraft platform as a front networking node, starting from a first turn-in-receive slot, the method further comprises: and if the handshake frame from the rear networking node is not received in the current time slot, continuing to send the handshake frame after the next transfer time slot.
4. The networking method according to claim 1, wherein the handshake frame structure comprises a guard period, a pilot period, a frame header, a transmission hold period, and a volume trailer;
the data frame structure comprises a protection time period, a pilot frequency period, a frame head section, a frame data section, a frame number section, a reserved data section and a volume tail section;
the duration lengths of the handshake frame structure and the data frame structure are the same as the duration of the sending time slot, and the positions of the frame head sections in the handshake frame and the data frame are different.
5. The networking method according to claim 4, wherein the front networking node and the back networking node accumulate frame numbers in the frame number segment from 1 frame by frame when a data frame occurs.
6. Method for networking an aircraft platform according to any one of claims 1 to 5, characterized in that the antenna satisfies the following condition:
the beam angle azimuth of the antenna is not less than 30 degrees, and the pitch angle comprises-15 degrees to 30 degrees;
the equivalent omnidirectional radiation power output by the antenna is not less than 30dBm, and the adjustable range is as follows: 0-60 dB, stepping is 1 dB;
acceptable doppler dynamic range: 300 KHz.
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