CN117595914A - Transmission path power gain analysis method based on double RIS auxiliary space-earth mobile communication - Google Patents

Transmission path power gain analysis method based on double RIS auxiliary space-earth mobile communication Download PDF

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CN117595914A
CN117595914A CN202311543815.XA CN202311543815A CN117595914A CN 117595914 A CN117595914 A CN 117595914A CN 202311543815 A CN202311543815 A CN 202311543815A CN 117595914 A CN117595914 A CN 117595914A
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array
ris
electromagnetic wave
regulation
mobile communication
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江浩
孙俊
张语欣
达勳
付丽娜
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NANJING CHINA-SPACENET SATELLITE TELECOM CO LTD
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NANJING CHINA-SPACENET SATELLITE TELECOM CO LTD
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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
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H04B7/18543—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for adaptation of transmission parameters, e.g. power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The invention discloses a transmission path power gain analysis method based on double RIS auxiliary air-ground mobile communication. By introducing double RIS auxiliary air-ground wireless communication, effective transmission of wireless signals can be realized; based on the geometric relations among the high altitude aircraft, the double RIS and road users, the nonlinear relation between the transmission path gain and the physical parameters of the double RIS is deduced in a numerical value mode, and the fact that the provided algorithm can describe the transmission characteristics of the double RIS auxiliary air-ground mobile communication system more easily is verified, so that the matching degree of a channel model in the design process of the double RIS auxiliary air-ground mobile communication system is improved, and important theoretical support is provided for the design and analysis of the performance of the double RIS auxiliary air-ground mobile communication system by research personnel.

Description

Transmission path power gain analysis method based on double RIS auxiliary space-earth mobile communication
Technical Field
The invention relates to a transmission path power gain analysis method based on double RIS auxiliary air-ground mobile communication, and belongs to the technical field of wireless communication.
Background
The air-ground wireless communication is used as an important component in the air-space-ground-sea integrated information network, theoretical research is developed towards the air-ground wireless communication, and the method has important theoretical significance and practical value for promoting development requirements of 6G wireless communication in a fourteen-five planning. In recent years, intelligent supersurface (RIS) is considered as an emerging technology that enables an uncontrollable wireless transmission environment to be controlled by regulating the amplitude and phase of electromagnetic wave signals. Therefore, the RIS technology is introduced into the air-to-ground wireless communication transmission scene, so that the performance of a communication system can be effectively improved. Research shows that the transmission model is always an important basis for system design whether the algorithm design of a small-scale multipath transmission channel or the network optimization of a large-scale fading channel is adopted.
A plurality of domestic subject groups are currently conducting theoretical research on air-to-ground wireless communication. In recent years, a team of Cui Tiejun university of southeast provides support for engineering application effectively by analyzing and measuring experiments of transmission characteristics under various parameter configurations aiming at various RIS auxiliary wireless communication scenes. Meanwhile, the university of southeast Zhang Zaichen teaches a team to search the influence of physical parameters (such as the number of array elements, the arrangement shape of the array elements and the like) of the RIS array on the electromagnetic wave transmission characteristic by deducing channel matrixes under different parameter configurations according to the RIS auxiliary high-altitude aircraft-ground user wireless communication scene. The university of south China university of technology Zhang Xiuyin teaches a plurality of effective optimization algorithms for RIS auxiliary wireless communication scenes, and the provided algorithms are verified by combining simulation results to effectively improve the performance of the RIS auxiliary wireless communication system. In addition, the university of Nanjing information engineering Jiang Hao teaches that a team establishes a double RIS auxiliary air-ground wireless communication channel model based on geometric characteristics aiming at an air-ground wireless communication scene, and analyzes the influence of the motion characteristics of an aircraft on the channel transmission characteristics. However, this study did not develop a study on path characteristics, and thus presented difficulties in accurately and efficiently analyzing and designing the RIS-assisted air-to-ground wireless communication system.
Disclosure of Invention
The invention aims to: the invention provides a transmission path power gain analysis method based on double RIS auxiliary air-ground mobile communication, which improves the matching degree of channel models in the design process of a double RIS auxiliary air-ground mobile communication system.
The technical scheme is as follows: a transmission path power gain analysis method based on double RIS auxiliary space-to-ground mobile communication comprises the following steps:
step S1: constructing a double RIS auxiliary air-ground mobile communication transmission model, wherein the model comprises a coordinate system, a transmitting end, a double RIS array and a receiving end;
step S2: when an electromagnetic wave signal sent by a transmitting end reaches a nearby RIS array, calculating signal power of a regulating unit in the RIS array;
step S3: after the amplitude and the phase of electromagnetic wave signals are regulated and controlled by an RIS array near the aircraft, calculating the signal power leaving a regulating and controlling unit in the RIS array;
step S4: when electromagnetic wave signals sent by an RIS array near an aircraft are transmitted to an RIS array near a receiving end, calculating signal power of a regulating unit in the RIS array near the receiving end;
step S5: after the amplitude and the phase of electromagnetic wave signals are regulated and controlled by an RIS array near the aircraft and an RIS array near the receiving end, calculating the signal power leaving the RIS array near the receiving end;
step S6: after the amplitude and the phase of electromagnetic wave signals are regulated and controlled by an RIS array near the aircraft and an RIS array near the receiving end, calculating the signal power transmitted to the receiving end;
step S7: when the electromagnetic wave signal sent by the transmitting end is regulated by the double RIS arrays and then transmitted to a ground user, the power gain of the transmission path is calculated.
Preferably, in step S1, for the space-to-ground mobile communication scenario of the transmitting end-ground user, the space-to-ground mobile communication scenario is established in three-dimensional free spaceA rectangular coordinate system; wherein a line perpendicular to the horizontal plane passing through the midpoint of the transmitting-end antenna array is defined as +.>An axis defining the connection line between the projection of the midpoint of the transmitting end antenna array falling on the horizontal plane and the midpoint of the receiving end antenna array as +.>A shaft; define the projection of the midpoint falling on the horizontal plane through the transmitting end antenna array and perpendicular to +.>The axis is +.>A shaft; the electromagnetic wave signal sent by the transmitting end is firstly modulated by the RIS array nearby the receiving end and then is transmitted to the receiving end.
Preferably, the RIS array near the transmitting end is denoted asThe RIS array near the receiving end is marked as +.>The electromagnetic wave signal emitted at the transmitting end in step S2 is up to +.>In the case of an array, the incidence is calculated>The signal power of the regulation and control unit in the array comprises the following specific steps:
step 201: in a dual RIS-assisted air-to-ground mobile communication transmission model, definitionIndicating the moving speed of the transmitting end, < >>Representing the movement time of the transmitting end +.>And->Respectively representing the angles of the moving direction of the transmitting end in the horizontal direction and in the vertical direction, and furthermore, define +.>Denoted as->The array deviates from the angle parameter in the horizontal direction, so that when the electromagnetic wave signal emitted by the transmitting terminal is up to +.>In the case of an array, the incidence is calculated>The +.>Row (/ ->) First->'Liu' of) The angle parameters of the regulation and control unit are as follows:
wherein,、/>and->Respectively indicate->The +.>Line->The geometric position of the column control units is +.>Shaft(s)>Shaft and->An on-axis component; definitions->And->Respectively indicate->The number of regulatory units in the direction of the horizontal axis and the direction of the vertical axis in the array; in addition, for the convenience of the clear display of the formula, the formula is just +.>Defined as A>Defined as B;
step 202: in a dual RIS auxiliary space-to-ground mobile communication transmission model, calculating the midpoint distance of an antenna array of a transmitting end toThe +.>Line->The geometric distance of the column control units is as follows:
step 202: electromagnetic wave signal emitted from transmitting endIn the case of an array, the incidence is calculated>The +.>Line->The signal power of the column control unit is:
wherein (1)>And->Respectively representing the power and gain of electromagnetic wave signals transmitted by a transmitting end; />Representation->Spacing between any two regulation units in the horizontal axis direction in the array, < > and->Representation->And the distance between any two regulation units in the longitudinal axis direction in the array is T, and the T represents a transmitting end.
Preferably, in the step S3, the amplitude and phase of the electromagnetic wave signal are determined byAfter array modulation, calculate departureThe +.>Line->The signal power of the column control unit is:
wherein,representing plural units->And->Respectively indicate->The +.>Line->The regulation amplitude and the regulation phase of the column regulation unit.
Preferably, in the step S4Electromagnetic wave signal emitted by the array>In the case of an array, the incidence is calculatedThe signal power of the regulation and control unit in the array comprises the following specific steps:
step 401: at the position ofThe electromagnetic wave signal emitted by the array is transmitted to +.>In the path of the array, calculate +.>The +.>Line->Column control unit and->The +.>Row (/ ->) First->Column (/ -)>) The geometric distance of the column control units is as follows:
wherein (1)>、/>And->Respectively indicate->The +.>Line->The geometric position of the column control units is +.>Shaft(s)>Shaft and->An on-axis component;
step 402: at the position ofThe electromagnetic wave signal emitted by the array is transmitted to +.>In the path of the array, calculate the incidence +.>The +.>Line->The angle parameters of the column control unit are as follows:
wherein (1)>Denoted as->The angular parameter of the array deviates from the horizontal direction;
step 403: at the position ofThe electromagnetic wave signal emitted by the array is transmitted to +.>In the path of the array, calculate incidence toThe +.>Line->The signal power of the column regulating unit is as follows:
wherein (1)>Representation->Spacing between any two regulation units in the horizontal axis direction in the array, < > and->Representation->The spacing between any two regulatory units in the longitudinal axis direction in the array.
Preferably, in the step S5, the amplitude and phase of the electromagnetic wave signal are determinedThe +.>Line->After the regulation of the column regulating unit, the column regulating unit is controlled by +.>The +.>Line->Column control unit controls, calculates leaving->The +.>Line->The signal power of the column control unit is:
wherein,and->Respectively indicate->The +.>Line->The regulation amplitude and the regulation phase of the column regulation unit;
。
preferably, in step S6, the amplitude and phase of the electromagnetic wave signal are sequentially determinedArray and->After array regulation, calculating the signal power transmitted to a receiving end, wherein the method comprises the following specific steps:
step 601: the electromagnetic wave signal sent out by the transmitting end is transmitted toWhen in array, the transmitting end of the aircraft is calculatedThe +.>Line->The functional expression of the angle parameter among the column control units is as follows:
。
step 602: in the electromagnetic signal pathWhen the array regulation is transmitted to the receiving end, the receiving end and the +.>The +.>Line->The functional expression of the angle parameter among the column control units is as follows:
wherein,representing the movement speed of the receiving end +.>Representing the included angle of the moving direction of the receiving end in the horizontal direction; step 603: in the electromagnetic signal channel->When the array regulation is transmitted to the receiving end, the receiving end and the +.>The +.>Line->The geometric path length between the column control units is as follows:
step 604: in the amplitude and phase of electromagnetic wave signalArray and->After array regulation, calculating the signal power transmitted to the receiving end as follows:
wherein,respectively represent the gain of the electromagnetic wave signal received by the receiving end, < + >>Indicating the wavelength of the electromagnetic wave.
Preferably, in the step S7, when the electromagnetic wave signal sent by the transmitting end is transmitted to the ground user after being regulated by the dual RIS, the power gain of the transmission path is calculated as follows:
。
compared with the prior art, the prior analysis on the large-scale path loss is mostly based on experimental measurement, the cost is high, the pertinence is weak, and the method provided by the invention can be used for researching the transmission path power gain of the double RIS auxiliary air-ground mobile communication under various parameter configurations by adjusting model parameters, and shows very ideal universal characteristics;
in a dual RIS assisted air-to-ground mobile communication scenario, where the high altitude aircraft is far from the road user, the signal emanating from the high altitude aircraft will experience a verified path loss. By introducing double RIS auxiliary air-ground wireless communication, effective transmission of wireless signals can be realized;
based on the geometric relations among the high altitude aircraft, the double RIS and road users, the nonlinear relation between the transmission path gain and the physical parameters of the double RIS is deduced in a numerical value mode, and the fact that the provided algorithm can describe the transmission characteristics of the double RIS-assisted air-ground mobile communication more accurately is verified, so that the matching degree of a channel model in the design process of the double RIS-assisted air-ground mobile communication system is improved, and important theoretical support is provided for the design and analysis of the performance of the double RIS-assisted air-ground mobile communication system by research personnel.
Drawings
Fig. 1: the invention provides a double RIS-based auxiliary air-ground mobile communication transmission model schematic diagram;
fig. 2: influence of different RIS array offset angles on transmission path power gain
Fig. 3: different RIS array phase regulation modes influence the power gain of the transmission path.
Detailed Description
The present invention is further illustrated below in conjunction with specific embodiments, it being understood that these embodiments are meant to be illustrative of the invention only and not limiting the scope of the invention, and that modifications of the invention, which are equivalent to those skilled in the art to which the invention pertains, will fall within the scope of the invention as defined in the claims appended hereto.
In the scheme of the invention, the method mainly aims at establishing a transmission path power gain analysis method based on double RIS auxiliary space-earth mobile communication.
The method specifically comprises the following 6 steps:
firstly, constructing a double RIS auxiliary air-ground mobile communication transmission model, and building in a three-dimensional free spaceRectangular coordinate system, define->Shaft(s)>Shaft and->The shaft is arranged in a mode. Wherein a line perpendicular to the horizontal plane through the mid-point of the aerial vehicle antenna array is defined as +.>An axis defining the connection line between the projection of the midpoint of the aerial array of the high-altitude aircraft falling on the horizontal plane and the midpoint of the aerial array of the receiving end as +.>A shaft; define the projection of the midpoint falling on the horizontal plane through the aerial vehicle antenna array and perpendicular to +.>The axis is +.>A shaft. In the dual RIS-assisted air-ground mobile communication scenario shown in fig. 1, the electromagnetic wave signal emitted from the high-altitude aircraft first passes through its nearby RIS (denoted as +.>) Then through RIS (denoted as) And after regulation, the regulated water is transmitted to a receiving end (namely road users).
And secondly, calculating the signal power of the regulating and controlling unit in the RIS array when the electromagnetic wave signal emitted by the high-altitude aircraft reaches the RIS array nearby. Definition of the definitionAnd->Respectively indicate->The number of the regulating units in the horizontal axis direction and the vertical axis direction in the array is regulated, and electromagnetic wave signals emitted by the high-altitude aircraft are transmitted to +.>In the case of an array, the incidence is calculated>The signal power of the cells in the array is regulated. The method comprises the following specific steps:
step 201: in a dual RIS-assisted air-to-ground mobile communication transmission model, definitionIndicating the moving speed of the transmitting end,representing the movement time of the transmitting end +.>And->Respectively representing the angles of the moving direction of the transmitting end in the horizontal direction and in the vertical direction, and furthermore, define +.>Denoted as->The array deviates from the angle parameter in the horizontal direction, so that when the electromagnetic wave signal emitted by the transmitting terminal is up to +.>In the case of an array, the incidence is calculated>The +.>Row (/ ->) First->'Liu' of) The angle parameters of the regulation and control unit are as follows:
wherein,、/>and->Respectively indicate->In array No/>Line->The geometric position of the column control units is +.>Shaft(s)>Shaft and->An on-axis component; definitions->And->Respectively indicate->The number of regulatory units in the direction of the horizontal axis and the direction of the vertical axis in the array; in addition, for the convenience of the clear display of the formula, the formula is just +.>Defined as A>Defined as B;
step 202: in a dual RIS auxiliary space-to-ground mobile communication transmission model, calculating the midpoint distance of an antenna array of a transmitting end toThe +.>Line->The geometric distance of the column control units is as follows:
step 202: electromagnetic wave signal emitted from transmitting endIn the case of an array, the incidence is calculated>The +.>Line->The signal power of the column control unit is:
wherein,and->Respectively representing the power and gain of electromagnetic wave signals transmitted by a transmitting end; />Representation->Spacing between any two regulation units in the horizontal axis direction in the array, < > and->Representation->And the distance between any two regulation units in the longitudinal axis direction in the array is T, and the T represents a transmitting end.
Third step, the amplitude and phase of the electromagnetic wave signal are measuredAfter array modulation, calculate leave ∈ ->In array NoLine->The signal power of the column control unit is:
wherein,representing plural units->And->Respectively indicate->The +.>Line->The regulation amplitude and the regulation phase of the column regulation unit.
Fourth step, inElectromagnetic wave signal emitted by the array>In the case of an array, the incidence is calculated>The signal power of the cells in the array is regulated. Concrete embodimentsThe method comprises the following steps:
step 401: at the position ofThe electromagnetic wave signal emitted by the array is transmitted to +.>In the path of the array, calculate +.>The +.>Line->Column control unit and->The +.>Row (/ ->) First->Column (/ -)>) The geometric distance of the column control units is as follows:
wherein,、/>and->Respectively indicate->The +.>Line->The geometric position of the column control units is +.>Shaft(s)>Shaft and->An on-axis component;
step 402: at the position ofThe electromagnetic wave signal emitted by the array is transmitted to +.>In the path of the array, calculate incidence toThe +.>Line->The angle parameters of the column control unit are as follows:
wherein,denoted as->The array being offset in the horizontal directionAngle parameters of (2);
step 403: at the position ofThe electromagnetic wave signal emitted by the array is transmitted to +.>In the path of the array, calculate incidence toThe +.>Line->The signal power of the column regulating unit is as follows:
wherein,representation->Spacing between any two regulation units in the horizontal axis direction in the array, < > and->Representation->The spacing between any two regulatory units in the longitudinal axis direction in the array.
Fifth step, the amplitude and phase of the electromagnetic wave signal are measuredThe +.>Line->After the regulation of the column regulating unit, the column regulating unit is controlled by +.>The +.>Line->Column control unit controls, calculates leaving->The +.>Line->The signal power of the column control unit is:
wherein (1)>And->Respectively indicate->The +.>Line->The regulation amplitude and the regulation phase of the column regulation unit;
。
sixth, the amplitude and phase of the electromagnetic wave signal are successively changedArray and->After the array is regulated, the signal power transmitted to the road surface user is calculated. The method comprises the following specific steps:
step 601: the electromagnetic wave signal sent out by the transmitting end is transmitted toWhen in array, the transmitting end of the aircraft is calculatedThe +.>Line->The functional expression of the angle parameter among the column control units is as follows:
。
step 602: in the electromagnetic signal pathWhen the array regulation is transmitted to the receiving end, the receiving end and the +.>The +.>Line->The functional expression of the angle parameter among the column control units is as follows:
wherein,representing the movement speed of the receiving end +.>Representing the included angle of the moving direction of the receiving end in the horizontal direction;
step 603: in the electromagnetic signal pathWhen the array regulation is transmitted to the receiving end, the receiving end and the +.>The +.>Line->The geometric path length between the column control units is as follows:
step 604: in the amplitude and phase of electromagnetic wave signalArray and->After array regulation, calculating the signal power transmitted to the receiving end as follows:
wherein,respectively represent the gain of the electromagnetic wave signal received by the receiving end, < + >>Indicating the wavelength of the electromagnetic wave.
Seventh, when electromagnetic wave signals sent by the high-altitude aircraft are transmitted to ground users after being regulated by double RIS, calculating the power gain of the transmission path as follows:
based on the above deduction, fig. 1 shows a transmission path power gain analysis method based on dual RIS assisted air-ground mobile communication according to the present invention. Fig. 2 depicts the effect of different RIS array offset angles on transmission path power gain in a dual RIS assisted air-to-ground mobile communication scenario. Simulation results indicate that as the high-altitude aircraft and road users move in timeThe power gain of the transmission path of the double RIS auxiliary air-ground mobile communication is continuously changed. This shows that the proposed algorithm is relatively sensitive to the moving time of the scene, exhibiting a time-domain non-stationary characteristic. In addition, the tilt angle of the RIS array is measured from the road surface user's vicinityIncrease to->In this case, the power gain of the transmission path of the dual RIS auxiliary air-to-ground mobile communication is continuously reduced. Therefore, in evaluating the performance of the dual RIS assisted air-to-ground wireless communication system, it is necessary to explore the transmission path power gain of the dual RIS assisted air-to-ground mobile communication for a specific time node.
FIG. 3 depicts transmission of different RIS array phase modulation schemes in a dual RIS assisted air-to-ground mobile communication scenarioThe effect of the power gain of the transmission path. Simulation results indicate that the power gain of the dual-hop transmission component is nearly negligible when the RIS near the high-altitude aircraft and road users, respectively, employ independent optimal phase regulation. When the RIS near the high-altitude aircraft and the road surface user adopts the combined optimal phase regulation, the incident light is incident toAs much of the signal energy as possible is reflected toThe power gain of the dual-hop transmission component is significantly increased, indicating the potential for the dual-hop transmission component to enhance communication performance. Therefore, when evaluating the performance of the dual RIS-assisted air-to-ground wireless communication system, it is necessary to explore the transmission path power gain of the dual RIS-assisted air-to-ground mobile communication for a specific RIS array phase adjustment mode.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (8)

1. The transmission path power gain analysis method based on the double RIS auxiliary space-to-ground mobile communication is characterized by comprising the following steps:
step S1: constructing a double RIS auxiliary air-ground mobile communication transmission model, wherein the model comprises a coordinate system, a transmitting end, a double RIS array and a receiving end;
step S2: when an electromagnetic wave signal sent by a transmitting end reaches a nearby RIS array, calculating signal power of a regulating unit in the RIS array;
step S3: after the amplitude and the phase of electromagnetic wave signals are regulated and controlled by an RIS array near the aircraft, calculating the signal power leaving a regulating and controlling unit in the RIS array;
step S4: when electromagnetic wave signals sent by an RIS array near an aircraft are transmitted to an RIS array near a receiving end, calculating signal power of a regulating unit in the RIS array near the receiving end;
step S5: after the amplitude and the phase of electromagnetic wave signals are regulated and controlled by an RIS array near the aircraft and an RIS array near the receiving end, calculating the signal power leaving the RIS array near the receiving end;
step S6: after the amplitude and the phase of electromagnetic wave signals are regulated and controlled by an RIS array near the aircraft and an RIS array near the receiving end, calculating the signal power transmitted to the receiving end;
step S7: when the electromagnetic wave signal sent by the transmitting end is regulated by the double RIS arrays and then transmitted to a ground user, the power gain of the transmission path is calculated.
2. The transmission path power gain analysis method based on the dual RIS assisted air-to-ground mobile communication according to claim 1, wherein: in the step S1, the space-to-ground mobile communication scene of the transmitting end-ground user is established in a three-dimensional free spaceA rectangular coordinate system; wherein, a line which passes through the midpoint of the antenna array at the transmitting end and is vertical to the horizontal plane is defined asAn axis defining the connection line between the projection of the midpoint of the transmitting end antenna array falling on the horizontal plane and the midpoint of the receiving end antenna array as +.>A shaft; define the projection of the midpoint falling on the horizontal plane through the transmitting end antenna array and perpendicular to +.>The axis is +.>A shaft; the electromagnetic wave signal sent by the transmitting end is firstly modulated by the RIS array nearby the receiving end and then is transmitted to the receiving end.
3. The transmission path power gain analysis method based on the dual RIS assisted air-to-ground mobile communication according to claim 1, wherein: the RIS array near the transmitting end is marked asThe RIS array near the receiving end is marked as +.>The electromagnetic wave signal emitted at the transmitting end in step S2 is up to +.>In the case of an array, the incidence is calculated>The signal power of the regulation and control unit in the array comprises the following specific steps:
step 201: in a dual RIS-assisted air-to-ground mobile communication transmission model, definitionIndicating the moving speed of the transmitting end, < >>Representing the movement time of the transmitting end +.>And->Respectively representing the angles of the moving direction of the transmitting end in the horizontal direction and in the vertical direction, and furthermore, define +.>Denoted as->The array deviates from the angular parameter in the horizontal direction,thus, when the electromagnetic wave signal emitted from the emitting terminal is up to +.>In the case of an array, the incidence is calculated>The +.>Row (/ ->) First->Column (/ -)>) The angle parameters of the regulation and control unit are as follows:
；
wherein,、/>and->Respectively indicate->The +.>Line->The geometric position of the column control units is that/>Shaft(s)>Shaft and->An on-axis component; definitions->And->Respectively indicate->The number of regulatory units in the direction of the horizontal axis and the direction of the vertical axis in the array; in addition, for the convenience of the clear display of the formula, the formula is just +.>Defined as A>Defined as B;
step 202: in a dual RIS auxiliary space-to-ground mobile communication transmission model, calculating the midpoint distance of an antenna array of a transmitting end toThe +.>Line->The geometric distance of the column control units is as follows:
；
step 202: electromagnetic wave signal emitted from transmitting endIn the case of an array, the incidence is calculated>The +.>Line 1The signal power of the column control unit is:
；
wherein,and->Respectively representing the power and gain of electromagnetic wave signals transmitted by a transmitting end; />Representation->Spacing between any two regulation units in the horizontal axis direction in the array, < > and->Representation->And the distance between any two regulation units in the longitudinal axis direction in the array is T, and the T represents a transmitting end.
4. A dual RIS-based assist as claimed in claim 1A transmission path power gain analysis method for space-to-ground mobile communication is characterized in that: in the step S3, the amplitude and phase of the electromagnetic wave signal are measuredAfter array modulation, calculate departureThe +.>Line->The signal power of the column control unit is:
；
wherein,representing plural units->And->Respectively indicate->The +.>Line->The regulation amplitude and the regulation phase of the column regulation unit.
5. The transmission path for air-ground mobile communication based on dual RIS assistance as claimed in claim 1The power gain analysis method is characterized in that: in the step S4Electromagnetic wave signal emitted by the array>In the case of an array, the incidence is calculatedThe signal power of the regulation and control unit in the array comprises the following specific steps:
step 401: at the position ofThe electromagnetic wave signal emitted by the array is transmitted to +.>In the path of the array, calculate +.>In array NoLine->Column control unit and->The +.>Row (/ ->) First->Column (/ -)>) The geometric distance of the column control units is as follows:
；
wherein,、/>and->Respectively indicate->The +.>Line->The geometric position of the column control units is +.>Shaft(s)>Shaft and->An on-axis component;
step 402: at the position ofThe electromagnetic wave signal emitted by the array is transmitted to +.>In the path of the array, calculate the incidence +.>The +.>Line->The angle parameters of the column control unit are as follows:
；
wherein,denoted as->The angular parameter of the array deviates from the horizontal direction;
step 403: at the position ofThe electromagnetic wave signal emitted by the array is transmitted to +.>In the path of the array, calculate the incidence +.>The +.>Line->The signal power of the column regulating unit is as follows:
；
wherein,representation->Spacing between any two regulation units in the horizontal axis direction in the array, < > and->Representation->The spacing between any two regulatory units in the longitudinal axis direction in the array.
6. The transmission path power gain analysis method based on the dual RIS assisted air-to-ground mobile communication according to claim 1, wherein: in the step S5, the amplitude and phase of the electromagnetic wave signal are measuredThe +.>Line->After the regulation of the column regulating unit, the column regulating unit is controlled by +.>The +.>Line->Column control unit controls, calculates leaving->The +.>Line->The signal power of the column control unit is:
；
wherein,and->Respectively indicate->The +.>Line->The regulation amplitude and the regulation phase of the column regulation unit;
。
7. the transmission path power gain analysis method based on the dual RIS assisted air-to-ground mobile communication according to claim 1, wherein: in the step S6, the amplitude and the phase of the electromagnetic wave signal are successively processedArray and->After array regulation, calculating the signal power transmitted to a receiving end, wherein the method comprises the following specific steps:
step 601: the electromagnetic wave signal sent out by the transmitting end is transmitted toIn the array, the transmitting end and the +.>The +.>Line->The functional expression of the angle parameter among the column control units is as follows:
；
。；
step 602: in the electromagnetic signal pathWhen the array regulation is transmitted to the receiving end, the receiving end and the +.>In array NoLine->The functional expression of the angle parameter among the column control units is as follows:
；
；
wherein,representing the movement speed of the receiving end +.>Representing the included angle of the moving direction of the receiving end in the horizontal direction;
step 603: in the electromagnetic signal pathWhen the array regulation is transmitted to the receiving end, the receiving end and the +.>The +.>Line->The geometric path length between the column control units is as follows:
；
step 604: in the amplitude and phase of electromagnetic wave signalArray and->After array regulation, calculating the signal power transmitted to the receiving end as follows:
；
wherein,respectively represent the gain of the electromagnetic wave signal received by the receiving end, < + >>Indicating the wavelength of the electromagnetic wave.
8. The transmission path power gain analysis method based on the dual RIS assisted air-to-ground mobile communication according to claim 1, wherein: in the step S7, when the electromagnetic wave signal sent by the transmitting end is transmitted to the ground user after being regulated by the dual RIS, the power gain of the transmission path is calculated as follows:
。
CN202311543815.XA 2023-11-20 2023-11-20 Transmission path power gain analysis method based on double RIS auxiliary space-earth mobile communication Pending CN117595914A (en)

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