CN112910559A - Wireless ultraviolet light covert communication system and method for unmanned aerial vehicle auxiliary fleet - Google Patents
Wireless ultraviolet light covert communication system and method for unmanned aerial vehicle auxiliary fleet Download PDFInfo
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- H—ELECTRICITY
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
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- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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Abstract
The invention discloses a wireless ultraviolet light covert communication system of an unmanned aerial vehicle auxiliary fleet, which comprises a communication base station, wherein the communication base station is electrically connected with an unmanned aerial vehicle relay system, and the unmanned aerial vehicle relay system comprises a signal receiving module, an information processing module a and a driving circuit which are sequentially connected through electric signals; the communication base station is electrically connected with the signal receiving module, and the driving circuit is electrically connected with an ultraviolet light transceiving module arranged on the relay of the unmanned aerial vehicle; the device also comprises an ultraviolet light transceiving module arranged on the battlefield vehicle, and a photoelectric conversion module electrically connected with the ultraviolet light transceiving module, wherein the photoelectric conversion module is sequentially connected with an information processing module b and a display module through electric signals. The invention also discloses a wireless ultraviolet light secret communication method. The wireless ultraviolet light communication is adopted, so that the hidden communication between the relay of the unmanned aerial vehicle and the battlefield vehicle is easy to realize, and the reliable transmission of information can be realized; other interference sources in the hostile environment in the wartime environment are also difficult to implement for long-distance interference.
Description
Technical Field
The invention belongs to the technical field of photoelectric information, and particularly relates to a wireless ultraviolet light covert communication system of an unmanned aerial vehicle auxiliary fleet and a wireless ultraviolet light covert communication method of the unmanned aerial vehicle auxiliary fleet.
Background
The information security is a precondition for winning modern wars, and the ultraviolet light communication has the advantages of strong anti-jamming capability, high confidentiality, low eavesdropping rate, low position resolution, omnidirectionality, all-weather working, non-direct-view communication and the like, so that the method is particularly suitable for military secret communication of unmanned aerial vehicle formation flight, naval vessel formation, army armor formation and guided missile vehicle fleet under radio silence and complex environment, can meet the requirement of a battlefield on secret communication, and becomes an effective means of battlefield safety communication. Ultraviolet communication is a novel communication mode which mainly adopts ultraviolet rays with a solar blind waveband (200 nm-280 nm) in short-wave ultraviolet rays as a transmission carrier and utilizes the scattering effect of particles, aerosol, dust and the like in the atmosphere on the solar blind ultraviolet rays to transmit information.
With the development of communication technology, in the modern war taking informatization and network centralization as the core, the speed of battlefield communication can be greatly improved, so that information transmission is faster and more stable in wartime, and the real-time performance and integration of information and command information transmission can be guaranteed. By means of the wireless communication technology, necessary information exchange, real-time tracking of the fighting state and flexible change of the fighting plan can be carried out. However, due to the influence of the geographical environment of the battlefield, it is difficult to erect base stations in areas such as mountains, lakes, etc.; the fixed communication equipment is damaged and large-area communication paralysis is caused by natural disasters such as earthquakes, tsunamis and the like in the combat area; the severe combat conditions lead to the damage of the short-distance base station, and the situations all lead to communication paralysis. The unmanned aerial vehicle is a portable multi-task device which has power, is controlled by radio remote control or depends on self programs to autonomously fly, executes various tasks, becomes a better choice for connecting a base station and a combat tank for communication by virtue of the unique advantages of flexibility, vertical take-off and landing, hovering in the air, flying in a low-altitude and ground-attached manner and the like, can be deployed rapidly and flexibly as a communication relay to participate in communication tasks, and provides communication service for the area where the base station is lost. Compared with a ground communication relay platform, the deployment period is short, the flexibility is high, and the communication quality is good; compared with the piloted airplane relay, the unmanned aerial vehicle is more intelligent to control and has high economic benefit; compared with a satellite communication relay, the satellite communication relay has stronger anti-interference capability. As a main device of the information station, the unmanned aerial vehicle can be widely applied to communication, investigation, detection and search, and has great research value and immeasurable application potential in the military field.
Disclosure of Invention
The invention aims to provide a wireless ultraviolet light covert communication system of an unmanned aerial vehicle auxiliary fleet, which solves the problem that normal communication of battlefield vehicles cannot be realized due to the fact that ground basic communication equipment is damaged or coverage rate is low in a wartime scene.
Another object of the present invention is to provide a wireless ultraviolet light stealth method for the unmanned aerial vehicle assisted fleet.
The invention adopts the technical scheme that the wireless ultraviolet light covert communication system of the unmanned aerial vehicle auxiliary fleet comprises a communication base station, wherein the communication base station is electrically connected with an unmanned aerial vehicle relay system, and the unmanned aerial vehicle relay system comprises a signal receiving module, an information processing module a and a driving circuit which are sequentially connected through electric signals; the communication base station is electrically connected with the signal receiving module, and the driving circuit is electrically connected with an ultraviolet light transceiving module arranged on the relay of the unmanned aerial vehicle; the device also comprises an ultraviolet light transceiving module arranged on the battlefield vehicle, and a photoelectric conversion module electrically connected with the ultraviolet light transceiving module, wherein the photoelectric conversion module is sequentially connected with an information processing module b and a display module through electric signals; the information processing module a and the information processing module b are also respectively connected with the power supply module.
The present invention is also characterized in that,
the ultraviolet light transceiving modules are all hemispherical ultraviolet LED arrays and are arranged in weft and warp.
The wavelength of each ultraviolet LED is 200 nm-280 nm.
The invention adopts another technical scheme that a wireless ultraviolet light covert communication method for an unmanned aerial vehicle auxiliary fleet is implemented according to the following steps:
step 1, a communication base station sends instruction information to be transmitted to a battlefield vehicle to a signal receiving module through a radio signal;
step 2, the signal receiving module sends the received encrypted instruction information to the information processing module a for decryption through a radio signal;
step 3, the information processing module a sends the decrypted instruction information to a driving circuit, the instruction information is amplified and then sent to an ultraviolet light transceiving module of the unmanned aerial vehicle relay, and the battlefield vehicle and the unmanned aerial vehicle relay perform information interaction in a wireless ultraviolet light mode;
and 4, the unmanned aerial vehicle relay transmits information with the battlefield vehicle, the unmanned aerial vehicle relay sends instruction information to the battlefield vehicle in the form of optical signals, and the battlefield vehicle sends the received information to the photoelectric conversion module and the information processing module b to receive, convert and process the information.
The present invention is also characterized in that,
in step 1, the instruction information is transmitted in an encryption mode, and the encryption method adopts an RSA asymmetric encryption algorithm, which specifically comprises the following steps: before communication, firstly, respectively generating a public key and a private key of a communication base station and an unmanned aerial vehicle relay system by using an RSA encryption algorithm, broadcasting the respective public keys, and locally storing the private keys; the communication base station uses the public key of the unmanned aerial vehicle relay to encrypt the instruction information to be transmitted, and sends the instruction information to the signal receiving module of the unmanned aerial vehicle relay in a radio mode.
In step 2, the information processing module a decrypts the received encrypted information by using a local private key in the RSA algorithm.
In step 3, the method specifically comprises the following steps: in the process of information transmission between unmanned aerial vehicle relay and battlefield vehicle, path loss PL is generated in the process of line-of-sight propagation and non-line-of-sight propagation of signals in the air-to-ground channel modelLOSAnd PLNLOSAs shown in formula (1) and formula (2):
wherein: etaLOSAnd ηNLOSExtra loss in line-of-sight and non-line-of-sight propagation, respectively, c is the speed of light, fcIs the carrier frequency, d is the distance between the unmanned aerial vehicle relay and the battlefield vehicle; due to the influence of the battle environment, only line-of-sight communication or non-line-of-sight communication link cannot be considered singly, so that the average path loss threshold value PL for battle field vehicle battles is shown as formula (3);
PL＝P(LOS)×PLLOS+P(NLOS)×PLNLOS (3)；
wherein, p (los), p (nlos) are propagation probabilities corresponding to the line-of-sight propagation and the non-line-of-sight propagation, respectively, as shown in formulas (4) and (5);
P(NLOS)＝1-P(LOS) (5)；
wherein: a is 4.88, b is 0.43,
the elevation angle of the battlefield vehicle to the unmanned aerial vehicle relay is r, the distance from a vertical projection point of the unmanned aerial vehicle relay to the ground to the battlefield vehicle is r, and the flight height of the unmanned aerial vehicle is h;
substituting the formula (4) and the formula (5) into the formula of the obtained average path loss threshold value, as shown in the formula (6);
when the environment and the carrier frequency are constant, A and B are constant, as shown in formula (7) and formula (8);
A＝ηLOS-ηNLOS (7)；
after the average path loss formula is calculated, the unmanned aerial vehicle relays smaller than the average path loss threshold value are added into the communication list by the battlefield vehicle, after the unmanned aerial vehicle relays are updated at fixed time intervals, the unmanned aerial vehicle relays in the communication list are sequenced according to the path loss, the number of the accessed vehicles is inquired from the unmanned aerial vehicle relays meeting the path loss requirement in the communication list, after the unmanned aerial vehicle relays respond to the number of the accessed vehicles, response messages are placed into the communication list, the response messages are arranged in an ascending sequence, and the unmanned aerial vehicle relay with the minimum number of the accessed vehicles is selected to be added into the communication, so that the unmanned aerial vehicle relays are successfully connected with the battlefield vehicle.
The invention has the beneficial effects that:
the wireless ultraviolet light communication technology is adopted to easily realize the secret communication between the relay of the unmanned aerial vehicle and the vehicles in the battlefield, the wireless ultraviolet light non-direct-view scattering communication can realize the reliable transmission of information without tracking and aiming, and the all-weather non-direct-view scattering communication in the system is ensured; ultraviolet light in a solar blind wave band (200 nm-280 nm) has a very strong absorption effect, and other interference sources of enemies in a wartime environment are difficult to implement remote interference.
Drawings
Fig. 1 is a block diagram of a wireless ultraviolet covert communication system of an unmanned aerial vehicle assisted fleet of vehicles according to the present invention;
fig. 2 is a diagram of an ultraviolet LED array in a wireless ultraviolet light covert communication system of an unmanned aerial vehicle assisted fleet according to the present invention;
fig. 3 is a schematic diagram of a relay platform of an unmanned aerial vehicle in a wireless ultraviolet light covert communication system of an unmanned aerial vehicle assisted fleet according to the present invention;
fig. 4 is a schematic diagram of information transmission between a relay of an unmanned aerial vehicle and a battlefield vehicle in a wireless ultraviolet light covert communication system of an unmanned aerial vehicle assisted fleet according to the present invention;
fig. 5 is a scene diagram of a ground user covered by a base station of an unmanned aerial vehicle in a wireless ultraviolet light covert communication system of an unmanned aerial vehicle assisted fleet.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a wireless ultraviolet light covert communication system for an unmanned aerial vehicle auxiliary fleet, which comprises a communication base station, wherein the communication base station is a central processing module and is electrically connected with an unmanned aerial vehicle relay system, and the unmanned aerial vehicle relay system comprises a signal receiving module, an information processing module a and a driving circuit which are sequentially connected through electric signals; the central processing module is electrically connected with the signal receiving module, and the driving circuit is electrically connected with an ultraviolet light transceiving module arranged on the relay of the unmanned aerial vehicle;
the system also comprises an ultraviolet light transceiving module arranged on the standing vehicle, and a photoelectric conversion module electrically connected with the ultraviolet light transceiving module, wherein the photoelectric conversion module is sequentially connected with an information processing module b and a display module through electric signals;
the information processing module a and the information processing module b are also respectively connected with the power supply module;
the ultraviolet light transceiving modules are all hemispherical ultraviolet LED arrays which are arranged in weft and warp, and as shown in figure 2, the wavelength of each ultraviolet LED is 200 nm-280 nm; the two ultraviolet light transceiving modules are respectively installed on the unmanned aerial vehicle relay and the battlefield vehicle;
the invention relates to a wireless ultraviolet light covert communication method for an unmanned aerial vehicle auxiliary fleet, which is implemented according to the following steps:
step 1, a communication base station sends instruction information to be transmitted to a battlefield vehicle to a signal receiving module through a radio signal;
the instruction information is transmitted in an encryption mode, and the encryption method adopts an RSA asymmetric encryption algorithm, and specifically comprises the following steps: before communication, firstly, respectively generating a public key and a private key of a communication base station and an unmanned aerial vehicle relay system by using an RSA encryption algorithm, broadcasting the respective public keys, and locally storing the private keys; the communication base station uses the public key of the unmanned aerial vehicle relay to encrypt the instruction information to be transmitted, and sends the instruction information to the signal receiving module of the unmanned aerial vehicle relay in a radio mode.
Step 2, the unmanned aerial vehicle relay sends the received encryption instruction information to the information processing module a for decryption through a radio signal;
the information processing module a decrypts the received encrypted information by using a local private key in an RSA algorithm;
step 3, the information processing module a sends the decrypted instruction information to a driving circuit, the instruction information is amplified and then sent to an ultraviolet light transceiving module of the unmanned aerial vehicle relay, and the battlefield vehicle and the unmanned aerial vehicle relay perform information interaction in a wireless ultraviolet light mode;
wireless ultraviolet light communication light source structure is shown in fig. 2, constitutes the hemisphere array structure with ultraviolet light LED, and the signal transmission of all directions in the space can be realized to the unmanned aerial vehicle relay, and the vehicle in the battlefield can both receive stronger ultraviolet light signal in all directions, thereby both sides all regard as the signal carrier with the ultraviolet light to realize reliable communication.
Fig. 3 shows a schematic diagram of a deployed unmanned aerial vehicle relay platform, and the unmanned aerial vehicle relay broadcasts an ID number and position information of the unmanned aerial vehicle to a battlefield vehicle in real time. The battlefield vehicle updates information such as ID and position of the unmanned aerial vehicle relay at fixed time intervals according to the received signal strength, selects one unmanned aerial vehicle base station in the unmanned aerial vehicle base stations to access the network according to the access strategy of the minimum access number meeting the path loss, and then communicates with the unmanned aerial vehicle relay.
In the process of information transmission between unmanned aerial vehicle relay and battlefield vehicle, path loss PL is generated in the process of line-of-sight propagation and non-line-of-sight propagation of signals in the air-to-ground channel modelLOSAnd PLNLOSAs shown in formula (1) and formula (2):
wherein: etaLOSAnd ηNLOSExtra loss in line-of-sight and non-line-of-sight propagation, respectively, c is the speed of light, fcIs the carrier frequency, d is the distance between the unmanned aerial vehicle relay and the battlefield vehicle; due to the influence of the combat environment, only line-of-sight communication or non-line-of-sight communication links cannot be considered singly, so that the average path loss threshold PL for any one battlefield vehicle is shown as a formula (3);
PL＝P(LOS)×PLLOS+P(NLOS)×PLNLOS (3)；
wherein, p (los), p (nlos) are propagation probabilities corresponding to line-of-sight propagation and non-line-of-sight propagation, respectively, and the calculation method is obtained by ITU (international telecommunication union), specifically as shown in formula (4) and formula (5);
P(NLOS)＝1-P(LOS) (5)；
wherein: a. b is a constant parameter, the value of which depends on the environment, a is 4.88, b is 0.43,
the elevation angle of the battlefield vehicle to the unmanned aerial vehicle relay is r, the distance from a vertical projection point of the unmanned aerial vehicle relay to the ground to the battlefield vehicle is r, and the flight height of the unmanned aerial vehicle is h;
substituting the formula (4) and the formula (5) into the formula of the obtained average path loss threshold value, as shown in the formula (6);
when the environment and the carrier frequency are constant, A and B are constant, as shown in formula (7) and formula (8);
A＝ηLOS-ηNLOS (7)；
after the calculation of the average path loss formula, the unmanned aerial vehicle relays smaller than the average path loss threshold value are added into the communication list by the battlefield vehicle, after the updating of a fixed time interval, the unmanned aerial vehicle relays of the communication list are sequenced according to the path loss, the number of the accessed vehicles is inquired from the unmanned aerial vehicle relays meeting the path loss requirement in the communication list, after the unmanned aerial vehicle relays respond to the number of the accessed vehicles, response messages are placed into the communication list, the response messages are arranged in an ascending sequence, and the unmanned aerial vehicle relay with the minimum number of the accessed vehicles is selected to be added into the communication, so that the unmanned aerial vehicle relays are successfully connected with the battlefield vehicle;
and 4, the unmanned aerial vehicle relay transmits information with the battlefield vehicle, the unmanned aerial vehicle relay sends instruction information to the battlefield vehicle in the form of optical signals, and the battlefield vehicle sends the received information to the photoelectric conversion module and the information processing module b to receive, convert and process the information.
Information transmission between the unmanned aerial vehicle relay and the battlefield vehicle is shown in fig. 4, the unmanned aerial vehicle relay sends a connection request message to the battlefield vehicle, and at the moment, the battlefield vehicle definitely succeeds in relay connection with the unmanned aerial vehicle; the battlefield vehicle sends a response message to the unmanned aerial vehicle relay to ensure that the unmanned aerial vehicle relay knows that the battlefield vehicle successfully receives the request of sending the message by the unmanned aerial vehicle relay, and at the moment, the unmanned aerial vehicle relay is definitely connected with the battlefield vehicle successfully; the unmanned aerial vehicle relay sends a confirmation packet to the battlefield vehicle for final confirmation, and after the confirmation is finished, the unmanned aerial vehicle relay forwards the received base station information (instruction information) to the battlefield vehicle.
The battlefield vehicle firstly converts the received instruction information into an electric signal through the photoelectric conversion module and then sends the electric signal to the information processing module to eliminate internal interference signals, and secondly sends the processed information to the display module to be displayed. In the same way, the battlefield vehicle relays and feeds back information such as mileage, track, oil consumption, speed, direction and the like to the unmanned aerial vehicle, and secret communication between the two parties is completed.
The wireless ultraviolet light covert communication system of the unmanned aerial vehicle auxiliary fleet is used for emergency communication scenes that natural disasters occur in a wartime environment and a ground base station is overloaded or fails, and the unmanned aerial vehicle base station performs communication coverage on a task area to provide communication services meeting requirements for battlefield vehicles. As shown in fig. 5, when there is no reliable communication link, the unmanned aerial vehicle relay system serves as a multi-hop path node to provide wireless connection service for a long-distance fleet. The unmanned aerial vehicle is used as a communication relay, is not influenced by complex ground or terrain, is convenient and flexible to deploy, has flexible communication equipment configuration and high transmission quality, can control the flight height of the unmanned aerial vehicle at any time, enables the coverage area of the unmanned aerial vehicle to change along with the size of a battlefield area and the communication requirement, and enables the flight height of the unmanned aerial vehicle to establish a sight distance transmission chain with a battlefield vehicle as far as possible, so that lower time delay and higher transmission rate are realized. The working mode of the wireless ultraviolet light source is narrow beam, low power emission and wide view field receiving, the wireless ultraviolet light communication technology is adopted to easily realize the secret communication between the relay of the unmanned aerial vehicle and the vehicles in the battlefield, the wireless ultraviolet light non-direct-view scattering communication can realize the reliable transmission of information without tracking and aiming, and the all-weather non-direct-view scattering communication in the system is ensured; ultraviolet light in a solar blind wave band (200 nm-280 nm) has a very strong absorption effect, and other interference sources of enemies in a wartime environment are difficult to implement remote interference.
The information safety has a decisive influence on war, the urgent need of a communication mobile scene and the miniaturization trend of relay equipment, so that the application scene of the wireless ultraviolet light covert communication system of the unmanned aerial vehicle auxiliary fleet has huge potential.
Claims (7)
1. A wireless ultraviolet light covert communication system of an unmanned aerial vehicle auxiliary fleet is characterized by comprising a communication base station, wherein the communication base station is electrically connected with an unmanned aerial vehicle relay system, and the unmanned aerial vehicle relay system comprises a signal receiving module, an information processing module a and a driving circuit which are sequentially connected through electric signals; the communication base station is electrically connected with the signal receiving module, and the driving circuit is electrically connected with an ultraviolet light transceiving module arranged on the relay of the unmanned aerial vehicle; the device also comprises an ultraviolet light transceiving module arranged on the battlefield vehicle, and a photoelectric conversion module electrically connected with the ultraviolet light transceiving module, wherein the photoelectric conversion module is sequentially connected with an information processing module b and a display module through electric signals; the information processing module a and the information processing module b are also respectively connected with the power supply module.
2. The system of claim 1, wherein the UV transceiver modules are all hemispherical UV LED arrays arranged in weft and warp.
3. The system of claim 2, wherein each of the uv LEDs has a wavelength of 200nm to 280 nm.
4. A wireless ultraviolet light secret communication method for an unmanned aerial vehicle auxiliary fleet is characterized by comprising the following steps:
step 1, a communication base station sends instruction information to be transmitted to a battlefield vehicle to a signal receiving module through a radio signal;
step 2, the signal receiving module sends the received encrypted instruction information to the information processing module a for decryption through a radio signal;
step 3, the information processing module a sends the decrypted instruction information to a driving circuit, the instruction information is amplified and then sent to an ultraviolet light transceiving module of the unmanned aerial vehicle relay, and the battlefield vehicle and the unmanned aerial vehicle relay perform information interaction in a wireless ultraviolet light mode;
and 4, the unmanned aerial vehicle relay transmits information with the battlefield vehicle, the unmanned aerial vehicle relay sends instruction information to the battlefield vehicle in the form of optical signals, and the battlefield vehicle sends the received information to the photoelectric conversion module and the information processing module b to receive, convert and process the information.
5. The wireless ultraviolet light covert communication method for the unmanned aerial vehicle auxiliary fleet according to claim 4, wherein in the step 1, the instruction information is transmitted in an encryption mode, and the encryption method adopts an RSA asymmetric encryption algorithm, and specifically comprises the following steps: before communication, firstly, respectively generating a public key and a private key of a communication base station and an unmanned aerial vehicle relay system by using an RSA encryption algorithm, broadcasting the respective public keys, and locally storing the private keys; the communication base station uses the public key of the unmanned aerial vehicle relay to encrypt the instruction information to be transmitted, and sends the instruction information to the signal receiving module of the unmanned aerial vehicle relay in a radio mode.
6. The method according to claim 5, wherein in step 2, the information processing module a decrypts the received encrypted information by using a local private key in RSA algorithm.
7. The method according to claim 4, wherein in step 3, the method specifically comprises: in the process of information transmission between unmanned aerial vehicle relay and battlefield vehicle, path loss PL is generated in the process of line-of-sight propagation and non-line-of-sight propagation of signals in the air-to-ground channel modelLOSAnd PLNLOSAs shown in formula (1) and formula (2):
wherein: etaLOSAnd ηNLOSExtra loss in line-of-sight and non-line-of-sight propagation, respectively, c is the speed of light, fcIs the carrier frequency, d is the distance between the unmanned aerial vehicle relay and the battlefield vehicle; due to the influence of the battle environment, only line-of-sight communication or non-line-of-sight communication link cannot be considered singly, so that the average path loss threshold value PL for battle field vehicle battles is shown as formula (3);
PL＝P(LOS)×PLLOS+P(NLOS)×PLNLOS (3)；
wherein, p (los), p (nlos) are propagation probabilities corresponding to the line-of-sight propagation and the non-line-of-sight propagation, respectively, as shown in formulas (4) and (5);
P(NLOS)＝1-P(LOS) (5)；
wherein: a is 4.88, b is 0.43,
the elevation angle of the battlefield vehicle to the unmanned aerial vehicle relay is r, the distance from a vertical projection point of the unmanned aerial vehicle relay to the ground to the battlefield vehicle is r, and the flight height of the unmanned aerial vehicle is h;
substituting the formula (4) and the formula (5) into the formula of the obtained average path loss threshold value, as shown in the formula (6);
when the environment and the carrier frequency are constant, A and B are constant, as shown in formula (7) and formula (8);
A＝ηLOS-ηNLOS (7)；
after the average path loss formula is calculated, the unmanned aerial vehicle relays smaller than the average path loss threshold value are added into the communication list by the battlefield vehicle, after the unmanned aerial vehicle relays are updated at fixed time intervals, the unmanned aerial vehicle relays in the communication list are sequenced according to the path loss, the number of the accessed vehicles is inquired from the unmanned aerial vehicle relays meeting the path loss requirement in the communication list, after the unmanned aerial vehicle relays respond to the number of the accessed vehicles, response messages are placed into the communication list, the response messages are arranged in an ascending sequence, and the unmanned aerial vehicle relay with the minimum number of the accessed vehicles is selected to be added into the communication, so that the unmanned aerial vehicle relays are successfully connected with the battlefield vehicle.
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| US20070253713A1 (en) * | 2004-10-25 | 2007-11-01 | Bae Systems Information And Electronic Systems Integration Inc. | Solar Blind Ultraviolet Communication System for Unattended Ground Sensor Network |
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