CN114039689A - Multi-dynamic-target-oriented wireless energy transmission rapid time inversion algorithm and generation device - Google Patents
Multi-dynamic-target-oriented wireless energy transmission rapid time inversion algorithm and generation device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/025—Filter arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
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- 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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Abstract
The invention provides a multi-dynamic-target wireless energy transmission-oriented rapid time inversion algorithm and a generation device, which control multi-target energy transmission in a time division multiplexing mode, realize phase conjugation in a radio frequency mixing mode, realize wireless energy transmission based on phase conjugation and self-adaptive tracking of multi-dynamic-target wireless energy transmission based on a heterodyne mixing direction backtracking array. The technical key points of the invention comprise the main technologies of mode control based on time division multiplexing, navigation signal transmitting and receiving, phase conjugation signal processing, klystron amplification and the like. The invention carries out wireless energy transmission based on time division multiplexing and phase conjugation, solves the problem of point-to-multipoint moving target energy transmission, and can be applied to a microwave wireless energy transmission system of a medium-low speed moving target. The invention backtracks the incoming wave in any direction by receiving the incoming wave in any direction through the forwarding antenna unit and meeting the phase conjugation principle, and has the advantages of concise principle, simple and efficient scheme and stronger engineering practicability.
Description
Technical Field
The invention belongs to the technical field of microwave wireless energy transmission, and particularly relates to a multi-dynamic-target wireless energy transmission-oriented rapid time inversion algorithm and a generation device.
Background
Nowadays, wireless intelligent devices play an increasingly important role in people's life, from parking spaces to unmanned aerial vehicles, from smart homes to smart cities, along with the upgrading of these device functions, the power consumption thereof is also increasingly high. The growth in the demand for wireless charging by these devices has driven the development of wireless energy transfer technologies.
Wireless energy transfer systems rely on electromagnetic radiation for operation. From Fris's formula
PRM＝(λ/4πD)2PtGtGr (1)
Due to the spatial attenuation characteristic of electromagnetic waves, the transmission efficiency decreases as the working distance increases, and if the transmission efficiency is to be improved, the gain of the transmitting/receiving antenna needs to be improved, and meanwhile, the precise beam pointing is ensured.
Because a precise beam control system needs higher cost, most of the existing microwave energy transmission systems are point-to-point static target energy transmission, and the use scenes of wireless energy transmission are greatly limited.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a rapid time inversion algorithm and a generating device for multi-dynamic-target wireless energy transmission are provided, which are used for wireless energy transmission based on phase conjugation.
The technical scheme adopted by the invention for solving the technical problems is as follows: the fast time inversion algorithm for multi-dynamic target wireless energy transfer comprises the following steps:
s0: building a multi-dynamic-target-oriented wireless energy transmission generating device, wherein the multi-dynamic-target-oriented wireless energy transmission generating device comprises an energy transmission end and a plurality of corresponding energy receiving ends in a local area network, and the energy transmission end and the energy receiving ends are communicated or transmitted through wireless signals; the energy transfer end comprises a receiving antenna, a frequency mixer, a signal generator, a power divider, a phase shifter, a klystron and a transmitting antenna; the receiving antenna is connected with the frequency mixer; the signal generator, the power divider, the phase shifter and the frequency mixer are sequentially connected according to the signal flow direction; the frequency mixer, the klystron and the transmitting antenna are connected in sequence according to the signal flow direction;
s1: in a communication mode based on time division multiplexing, a plurality of dynamic energy-receiving terminals send energy transmission requests to energy transmission terminals;
s2: after agreeing, the energy transmitting end sends the time sequence of transmitting the navigation signal to each energy receiving end to avoid mutual interference;
s3: the dynamic energy receiving end sends a navigation signal to the energy transmitting end according to the time sequence;
s4: the energy transfer end carries out time reversal on the received navigation signal;
s5: after the energy transfer end completes time reversal and power amplification, the energy carrying signal is forwarded through the transmitting antenna to align to the direction of the received navigation signal, and dynamic wireless energy transfer is completed.
According to the scheme, in the step S4, the specific steps are as follows:
s41: under the condition that the position information of an incoming wave is unknown, the energy transfer end receives a navigation signal as a radio frequency signal of the frequency mixer through the receiving antenna;
s42: the signal generator generates a navigation signal frequency-doubled signal, and the navigation signal frequency-doubled signal passes through the power divider and the phase shifter and then serves as a local oscillation signal of the frequency mixer;
s43: carrying out heterodyne frequency mixing on the radio-frequency signal and the local oscillator signal through a frequency mixer to finish phase conjugation, and outputting a time reversal signal after the phase conjugation by the intermediate frequency of the frequency mixer;
s44: the power of the time reversal signal is amplified through the klystron, and the energy receiving end is traced back through the transmitting antenna, so that the navigation signal is automatically traced.
Further, in step S43, the phase conjugation specifically includes:
phase conjugation is realized by optimizing a conjugation frequency mixer and adopting a radio frequency heterodyne frequency mixing method for once frequency conversion.
Further, in step S43, the mixing specifically includes:
radio frequency signalAmplitude of signal RF is VRFFrequency of the radio frequency signal RF is ωRFThe phase value of the radio frequency signal RF is
The radio frequency signal RF is
The frequency of the local oscillator signal LO is twice of the frequency of the radio frequency signal RF;
mixing a radio frequency signal RF and a local oscillator signal LO, wherein the frequency of an obtained intermediate frequency signal IF is equal to the RF frequency, and the phase conjugation:
a generation device for multi-dynamic-target wireless energy transmission comprises an energy transmission end and a plurality of corresponding energy receiving ends in a local area network, wherein the energy transmission end and the energy receiving ends communicate or transmit energy through wireless signals; the energy transfer end comprises a receiving antenna, a frequency mixer, a signal generator, a power divider, a phase shifter, a klystron and a transmitting antenna; the receiving antenna is connected with the frequency mixer; the signal generator, the power divider, the phase shifter and the frequency mixer are sequentially connected according to the signal flow direction; the frequency mixer, the klystron and the transmitting antenna are connected in sequence according to the signal flow direction.
Further, the mixer comprises a nonlinear element and a frequency selection loop; the signal generator comprises a voltage-controlled oscillator working in a radio frequency band, and a local oscillation signal LO works in an ultra-wideband range; the operating frequency band of the mixer is greater than or equal to the operating frequency band of the local oscillator signal LO.
Further, the mixer is used for 10GHz wireless energy transfer, and the indexes of the mixer are as follows:
the frequency range of the radio frequency signal is 8 GHz-12 GHz;
the local oscillation frequency range is 18 GHz-22 GHz;
the frequency range of the intermediate frequency signal is 8 GHz-12 GHz;
the variable frequency loss is less than 8 dB;
L-R isolation <20 dB.
Further, the mixer further comprises a low pass filter for low pass filtering the signal input to the mixer.
A computer storage medium having stored therein a computer program executable by a computer processor, the computer program executing a fast time inversion algorithm for multi-dynamic object wireless energy transfer.
The invention has the beneficial effects that:
1. the multi-dynamic-target wireless energy transmission-oriented rapid time inversion algorithm and the generation device control multi-target energy transmission in a time division multiplexing mode, realize phase conjugation in a radio frequency mixing mode, realize wireless energy transmission based on phase conjugation and self-adaptive tracking of multi-dynamic-target wireless energy transmission based on a heterodyne mixing direction backtracking array.
2. The technical key points of the invention comprise the main technologies of mode control based on time division multiplexing, navigation signal transmitting and receiving, phase conjugation signal processing, klystron amplification and the like.
3. The invention carries out wireless energy transmission based on time division multiplexing and phase conjugation, solves the problem of point-to-multipoint moving target energy transmission, and can be applied to a microwave wireless energy transmission system of a medium-low speed moving target.
Regardless of the direction of the incoming wave, as long as the forwarding antenna unit can receive the incoming wave in any direction and meet the phase conjugation principle, the incoming wave in any direction can be traced back. The method has the advantages of simple principle, simple and efficient generation scheme and strong engineering practicability.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Fig. 2 is a schematic block diagram of an embodiment of the present invention.
Fig. 3 is a schematic diagram of radio frequency heterodyne mixing according to an embodiment of the present invention.
Fig. 4 is a simulation diagram of heterodyne mixing of navigation signals according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention comprises that the energy transmitting end and the energy receiving end are in a one-to-many relationship and are positioned in the local area network, and when the energy transmitting end sends the energy transmitting request, the energy transmitting end can transmit the time sequence of the navigation signal to each energy receiving end to avoid mutual interference. In order to meet the requirement of a radio frequency system, the heterodyne mixing method is determined to be adopted to realize phase conjugation by integrating cost and function consideration. Considering that wireless energy transmission does not need a broadband and cost is controlled as much as possible, phase conjugation is realized by adopting a radio frequency mixing method through one-time frequency conversion, and meanwhile, a conjugation mixer is reasonably optimized and isolation and cost are considered.
Referring to fig. 1, the fast time inversion algorithm for multi-dynamic-target wireless energy transfer of the present invention comprises the following steps:
mode control based on time division multiplexing: the multiple energy receiving ends and the energy transmitting ends are in a communication mode, when the multiple energy receiving ends send energy transmitting requests, the energy transmitting ends send time sequences for transmitting navigation signals to all the energy receiving ends after agreeing, and the dynamic energy receiving ends send the navigation signals according to the time sequences to conduct wireless energy transmission. Firstly, when a plurality of dynamic energy receiving ends send energy transmitting requests to the energy transmitting end, the energy transmitting end will send the time sequence of transmitting navigation signals to each energy receiving end after agreeing, and the dynamic energy receiving end sends the navigation signals according to the time sequence to carry out wireless energy transmission.
Navigation signal transmitting and receiving: the energy receiving end needs to transmit navigation signals to a moving target, and the receiving antenna of the energy transmitting end receives the navigation signals under the condition that the incoming wave position information is unknown. After time reversal and power amplification are completed, the transmitting antenna is responsible for forwarding the energy carrying signal to align the incoming wave direction. The energy transfer end receives the navigation signal as a radio frequency signal of the frequency mixer by using the receiving antenna, and the other routing signal generator generates a frequency-doubled signal as a local oscillation signal of the frequency mixer.
Phase conjugate signal processing: heterodyne mixing is performed with a mixer. The received navigation signal is used as a radio frequency signal of the frequency mixer, and the signal generator generates frequency-doubled signals which are used as local oscillation signals of the frequency mixer through the phase shifter. The intermediate frequency of the mixer may output a phase conjugated signal. After the two signals are mixed, phase conjugation is completed, a time reversal signal is obtained, and self-tracking of the navigation signal can be achieved.
Amplifying a klystron: and amplifying the power of the signal after phase conjugation through a klystron. And the time-reversed signal amplifies power through a klystron and backtracks to an energy receiving end through a transmitting antenna to complete dynamic wireless energy transmission.
Fig. 2 is a schematic diagram of a wireless energy transfer system, in which a navigation signal is first sent by an energy receiving end, the energy transfer end uses the navigation signal received by a receiving antenna as a radio frequency signal of a mixer, and another routing signal generator generates a signal of double frequency of the navigation signal, and then the signal passes through a power divider and then is used as a local oscillation signal of the mixer. After the two signals are mixed, the power is amplified through a klystron, and the signals are traced back to an energy receiving end through a transmitting antenna.
Fig. 3 is a diagram illustrating a typical rf heterodyne mixing scheme. For a radio frequency signal, it can be expressed as:
in the radio frequency mixing, a local oscillator signal (LO) with a frequency twice that of a Radio Frequency (RF) is mixed with a received radio frequency signal to obtain an Intermediate Frequency (IF) with the same frequency as the RF frequency and a phase conjugate.
The concrete theoretical derivation is shown in formula (2). The actual mixer also includes a low-pass filtering process, and the direction backtracking can be realized by using the mixing mode with a simpler circuit.
FIG. 4 is a simulation diagram of heterodyne mixing of navigation signals, and in accordance with the result of equation (2), a low-pass filter is built in an actual mixer, and the signals pass through the mixer to obtain time-reversal signals.
The mixer is usually made up of a non-linear element and a frequency selective loop. To implement the mixing function, the mixer also needs to receive a Local Oscillator (LO) signal from a voltage controlled oscillator, and its circuit is fully operated in the rf frequency band. The local oscillator signal operates in the ultra wide band range, so that the frequency band of the mixer is at least greater than or equal to the frequency band of the local oscillator signal. Table 1 shows the mixer index for 10GHz wireless power transmission.
TABLE 1 Mixer index for 10GHz
| Index (I) | Range |
| Radio frequency signal frequency range (GHz) | 8～12 |
| Local oscillator frequency range (GHz) | 18～22 |
| Frequency range of intermediate frequency signals (GHz) | 8～12 |
| Variable frequency loss [ dB ]] | <8 |
| L-R isolation [ dB ]] | <20 |
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (9)
1. The fast time inversion algorithm facing to the wireless energy transmission of multiple dynamic targets is characterized in that: the method comprises the following steps:
s0: building a multi-dynamic-target-oriented wireless energy transmission generating device, wherein the multi-dynamic-target-oriented wireless energy transmission generating device comprises an energy transmission end and a plurality of corresponding energy receiving ends in a local area network, and the energy transmission end and the energy receiving ends are communicated or transmitted through wireless signals; the energy transfer end comprises a receiving antenna, a frequency mixer, a signal generator, a power divider, a phase shifter, a klystron and a transmitting antenna; the receiving antenna is connected with the frequency mixer; the signal generator, the power divider, the phase shifter and the frequency mixer are sequentially connected according to the signal flow direction; the frequency mixer, the klystron and the transmitting antenna are connected in sequence according to the signal flow direction;
s1: in a communication mode based on time division multiplexing, a plurality of dynamic energy-receiving terminals send energy transmission requests to energy transmission terminals;
s2: after agreeing, the energy transmitting end sends the time sequence of transmitting the navigation signal to each energy receiving end to avoid mutual interference;
s3: the dynamic energy receiving end sends a navigation signal to the energy transmitting end according to the time sequence;
s4: the energy transfer end carries out time reversal on the received navigation signal;
s5: after the energy transfer end completes time reversal and power amplification, the energy carrying signal is forwarded through the transmitting antenna to align to the direction of the received navigation signal, and dynamic wireless energy transfer is completed.
2. The multi-dynamic-target-oriented wireless energy transfer fast time inversion algorithm of claim 1, wherein: in the step S4, the specific steps are as follows:
s41: under the condition that the position information of an incoming wave is unknown, the energy transfer end receives a navigation signal as a radio frequency signal of the frequency mixer through the receiving antenna;
s42: the signal generator generates a navigation signal frequency-doubled signal, and the navigation signal frequency-doubled signal passes through the power divider and the phase shifter and then serves as a local oscillation signal of the frequency mixer;
s43: carrying out heterodyne frequency mixing on the radio-frequency signal and the local oscillator signal through a frequency mixer to finish phase conjugation, and outputting a time reversal signal after the phase conjugation by the intermediate frequency of the frequency mixer;
s44: the power of the time reversal signal is amplified through the klystron, and the energy receiving end is traced back through the transmitting antenna, so that the navigation signal is automatically traced.
3. The multi-dynamic-target-oriented wireless energy transfer fast time inversion algorithm of claim 2, wherein: in step S43, the specific step of phase conjugation is:
phase conjugation is realized by optimizing a conjugation frequency mixer and adopting a radio frequency heterodyne frequency mixing method for once frequency conversion.
4. The multi-dynamic-target-oriented wireless energy transfer fast time inversion algorithm of claim 3, wherein: in step S43, the specific steps of mixing are:
let the amplitude of the RF signal be VRFThe frequency of the radio frequency signal RF is omegaRFThe phase value of the radio frequency signal RF is
The radio frequency signal RF is
The frequency of the local oscillator signal LO is twice of the frequency of the radio frequency signal RF;
mixing a radio frequency signal RF and a local oscillator signal LO, wherein the frequency of an obtained intermediate frequency signal IF is equal to the RF frequency, and the phase conjugation:
5. a generation device of the multi-dynamic-target wireless energy transfer oriented fast time inversion algorithm based on any one of claims 1 to 4, characterized in that: the system comprises an energy transmitting end and a plurality of corresponding energy receiving ends in a local area network, wherein the energy transmitting end and the energy receiving ends communicate or transmit energy through wireless signals; the energy transfer end comprises a receiving antenna, a frequency mixer, a signal generator, a power divider, a phase shifter, a klystron and a transmitting antenna; the receiving antenna is connected with the frequency mixer; the signal generator, the power divider, the phase shifter and the frequency mixer are sequentially connected according to the signal flow direction; the frequency mixer, the klystron and the transmitting antenna are connected in sequence according to the signal flow direction.
6. The generation apparatus according to claim 5, characterized in that:
the mixer comprises a nonlinear element and a frequency selection loop; the signal generator comprises a voltage-controlled oscillator working in a radio frequency band, and a local oscillation signal LO works in an ultra-wideband range; the operating frequency band of the mixer is greater than or equal to the operating frequency band of the local oscillator signal LO.
7. The generation apparatus according to claim 5, characterized in that:
the mixer is used for wireless energy transfer of 10GHz, and the indexes of the mixer are as follows:
the frequency range of the radio frequency signal is 8 GHz-12 GHz;
the local oscillation frequency range is 18 GHz-22 GHz;
the frequency range of the intermediate frequency signal is 8 GHz-12 GHz;
the variable frequency loss is less than 8 dB;
L-R isolation <20 dB.
8. The generation apparatus according to claim 5, characterized in that:
the mixer further comprises a low-pass filter for low-pass filtering the signal input to the mixer.
9. A computer storage medium, characterized in that: stored with a computer program executable by a computer processor, the computer program implementing the multi-dynamic object wireless energy transfer oriented fast time inversion algorithm according to any one of claims 1 to 4.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005828A (en) * | 2010-11-30 | 2011-04-06 | 电子科技大学 | Wireless sensor network node wireless charging system and method based on time reflection |
| CN108988914A (en) * | 2018-08-29 | 2018-12-11 | 西安空间无线电技术研究所 | A kind of Terahertz communication beams backtracking device and method based on biconjugate mixing |
| US20190140766A1 (en) * | 2016-04-25 | 2019-05-09 | University Of Maryland, College Park | System and method for wireless power transfer using time reversed electromagnetic wave propagation |
| CN113364474A (en) * | 2021-05-20 | 2021-09-07 | 电子科技大学 | Dynamic gain wireless energy transmission system and method based on time reversal |
| CN113507745A (en) * | 2021-06-23 | 2021-10-15 | 电子科技大学 | Multi-user power distribution method and system based on time reversal wireless energy transmission |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005828A (en) * | 2010-11-30 | 2011-04-06 | 电子科技大学 | Wireless sensor network node wireless charging system and method based on time reflection |
| US20190140766A1 (en) * | 2016-04-25 | 2019-05-09 | University Of Maryland, College Park | System and method for wireless power transfer using time reversed electromagnetic wave propagation |
| CN108988914A (en) * | 2018-08-29 | 2018-12-11 | 西安空间无线电技术研究所 | A kind of Terahertz communication beams backtracking device and method based on biconjugate mixing |
| CN113364474A (en) * | 2021-05-20 | 2021-09-07 | 电子科技大学 | Dynamic gain wireless energy transmission system and method based on time reversal |
| CN113507745A (en) * | 2021-06-23 | 2021-10-15 | 电子科技大学 | Multi-user power distribution method and system based on time reversal wireless energy transmission |
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