CN110943789A - Method for generating energy receiving node detection signal and wireless energy transmission method - Google Patents
Method for generating energy receiving node detection signal and wireless energy transmission method Download PDFInfo
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- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
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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
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Abstract
An embodiment of the present invention provides a method for generating an energy-receiving node probe signal, including: acquiring a plurality of OVSF codes; respectively carrying out pulse position modulation on the OVSF codes to generate a plurality of pulse modulation signals; and distributing a plurality of pulse modulation signals to a plurality of energy-receiving nodes as detection signals of the energy-receiving nodes, wherein each energy-receiving node corresponds to one pulse modulation signal. Correspondingly, the invention also provides a device for generating the detection signal of the energy-receiving node and a readable storage medium. Another embodiment of the present invention provides a wireless power transmission method, including: the energy receiving node sends the detection signal generated in the step to the energy transmission node so that the energy transmission node obtains an acquisition signal corresponding to the detection signal; the energy transmission node performs correlation operation on the acquired signal and the detection signal of the energy receiving node to generate an energy transmission signal; and sending the energy transmission signal to the corresponding energy receiving node to supply energy to the energy receiving node. The invention improves the energy transmission efficiency and can realize broadband energy transmission.
Description
Technical Field
The invention relates to the technical field of wireless energy transmission, in particular to a method for generating an energy-receiving node detection signal and a wireless energy transmission method.
Background
Pipelines are used for transmitting energy such as petroleum and natural gas in a large quantity, and in order to prevent environmental pollution and loss of personnel and property caused by pipeline leakage, a sensor is required to be installed on the pipeline to monitor the state of the pipeline. The sensors need energy supply in the working process, but some pipelines are laid underground, in mountainous areas or even in the ocean, so that energy can not be supplied to the sensors (energy receiving nodes) directly through manpower. Therefore, Wireless Power Transmission (WPT) is a research hotspot in the field of current energy Transmission.
Chinese patent application 201810697568.1 discloses a wireless common-source energy transmission method, which uses N TR (Time Reversal) energy transmission units as energy relay devices of a single wireless common-source device to realize energy transmission for M users. The use of multiple energy relay devices results in increased energy losses and lower energy transfer efficiency.
Chinese patent application 201810580750.9 discloses a multi-target selective wireless energy transmission method based on focused waves, which linearly superimposes energy transmission request signals obtained by a time reversal mirror according to a certain superposition coefficient to synthesize energy transmission signals. The method needs to detect all channels of the target needing energy transmission independently, and needs a large amount of channel detection and storage when a large amount of charging targets exist, so that the scheme is complex.
Chinese patent application 201611006929.0 discloses a microwave narrowband wireless energy transmission method based on focused waves, which is based on time reversal technology, and concentrates electromagnetic energy in an energy receiving area by utilizing the environment adaptivity and space-time focusing characteristic of time reversal. However, due to the fact that the time reversal technology has a near-far effect, when the energy transmission source transmits energy to a plurality of energy receiving targets, most energy is divided by energy receiving nodes close to each other, and energy receiving nodes far away from the energy transmission source or energy receiving nodes small in detection signals cannot obtain energy.
Chinese patent application 201810698828.7 discloses a single-to-multiple multi-frequency wireless energy transmission method, which performs energy transmission by selecting energy transmission frequency points with high energy transmission efficiency, and if there are one or more energy receiving devices with low energy transmission efficiency at all frequency points, the scheme only selects the frequency points with high energy transmission efficiency instead of the frequency points with low energy transmission efficiency, which will result in some energy receiving devices not being able to obtain energy supply.
Chinese patent application 201810580731.6 discloses a frequency division multiple access multi-target parallel wireless energy transmission method, which charges targets by allocating a single frequency spectrum for each charging target, and the energy transmission end sends broadband and multi-frequency signals, and the charging target only receives energy of a single frequency point, which causes energy waste of other frequency points and low energy transmission efficiency.
Chinese patent application 201710302251.9 discloses a system for wireless energy transmission for a sealed metal container, which uses a general direct energy transmission method, and has a good energy transmission efficiency in a sealed space, but a low energy transmission efficiency when used in a pipeline structure with a long size.
Therefore, it is desirable to provide a wireless energy transmission method with high energy transmission efficiency to solve the above problems in the prior art.
Disclosure of Invention
The invention aims to provide a method for generating a detection signal of an energy-receiving node, a device for generating a detection signal of an energy-receiving node, a computer-readable storage medium and a wireless energy transmission method, so as to improve the energy transmission efficiency and realize broadband energy transmission.
In order to achieve the above object, an embodiment of the present invention provides a method for generating a probe signal of an energy-receiving node, which is suitable for wireless energy transmission from an energy transmission node to a plurality of energy-receiving nodes, and includes the following steps:
(1) acquiring a plurality of OVSF codes (Orthogonal Variable Spreading Factor);
(2) respectively carrying out pulse position modulation on the OVSF codes to generate a plurality of pulse modulation signals;
(3) and distributing a plurality of pulse modulation signals to a plurality of the energy-bearing nodes as the detection signals of the energy-bearing nodes, wherein each energy-bearing node corresponds to one pulse modulation signal.
Preferably, each OVSF code includes a plurality of chips, each chip corresponds to a pulse signal, and the pulse signals are pulse position modulated to generate the pulse modulated signal.
Preferably based on a formula
Generating the pulse modulation signal; wherein x isn(t) is the nth said pulse modulated signal,
representing a convolution operation, g (t) is the pulse signal,
is the value of the mth chip of the nth OVSF code, M is the length of the nth OVSF code,
is the position of the pulse signal corresponding to the mth chip, t is the time, t0For a custom time interval, δ (t) is the ideal impulse response.
Meanwhile, the invention provides a device for generating the enabled node probing signal, which comprises a processor, a memory and one or more computer programs, wherein the computer programs are stored in the memory and configured to be executed by the processor, and when the processor executes the computer programs, the method for generating the enabled node probing signal is executed.
Meanwhile, the invention also provides a computer readable storage medium, which comprises one or more computer programs used in combination with the generation device of the enabled node detection signal, wherein the computer programs can be executed by a processor to complete the generation method of the enabled node detection signal.
In order to achieve the above object, another embodiment of the present invention provides a wireless energy transmission method, adapted to perform wireless energy transmission on a plurality of energy-receiving nodes by an energy transmission node, including the following steps:
(1) providing a plurality of OVSF codes;
(2) respectively carrying out pulse position modulation on the OVSF codes to generate a plurality of pulse modulation signals;
(3) distributing a plurality of pulse modulation signals to a plurality of the energy-receiving nodes as detection signals of the energy-receiving nodes, wherein each energy-receiving node corresponds to one pulse modulation signal;
(4) the energy receiving node sends the detection signal to the energy transmission node so that the energy transmission node obtains an acquisition signal corresponding to the detection signal;
(5) the energy transmission node carries out correlation operation on the acquisition signal and the detection signal of the energy receiving node to generate an energy transmission signal;
(6) and sending the energy transmission signal to the corresponding energy receiving node to supply energy to the energy receiving node.
Preferably, each OVSF code includes a plurality of chips, each chip corresponds to a pulse signal, and the pulse signals are pulse position modulated to generate the pulse modulated signal.
Preferably based on a formula
Generating the pulse signal; wherein g (t) is the pulse signal, wcIs the center frequency, T, of the pulse signalgIs the width of the pulse signal, t is the time, AgIs the amplitude of the pulse signal.
Preferably based on a formula
Generating the pulse modulation signal; wherein x isn(t) is the nth said pulse modulated signal,
representing a convolution operation, g (t) is the pulse signal,
is the value of the mth chip of the nth OVSF code, M is the length of the nth OVSF code,
is the position of the pulse signal corresponding to the mth chip, t is the time, t0For a custom time interval, δ (t) is the ideal impulse response.
Preferably, the energy transmission node is an energy transmission array including a plurality of energy transmission units, and the energy transmission signal is generated by superimposing signals generated by the plurality of energy transmission units according to the acquisition signal and the detection signal.
Compared with the prior art, the invention utilizes the OVSF code to carry out pulse position modulation to generate a plurality of groups of pulse modulation signals which are mutually irrelevant, each energy receiving node adopts different pulse modulation signals as the detection signal thereof, and the proportion of signal energy corresponding to a target energy receiving node in the energy transmission signal is enhanced by carrying out relevant operation on the acquired signal and the detection signal at the energy transmission node, thereby greatly improving the energy at the target energy receiving node and improving the directional energy transmission efficiency of the energy transmission node; moreover, by pulse position modulation of the OVSF code, broadband energy transmission can be achieved. In addition, because the detection signals of all the energy receiving nodes are not related to each other, energy can be transmitted to the energy receiving nodes through a plurality of energy transmission units together, and the signals transmitted by all the energy transmission units are overlapped with each other at the energy receiving nodes, so that the energy receiving nodes can obtain enhanced energy transmission signals, and the energy transmission efficiency is further improved. In addition, the invention does not need to detect the detection signal of each energy receiving node independently, and can improve the energy of the area where the target energy receiving node is located under the condition of lacking the information such as the position, the channel and the like of the target energy transmission node, thereby greatly shortening the energy transmission time and improving the reaction speed.
Drawings
Fig. 1 is a flowchart of a method for generating a probe signal of an enabled node according to an embodiment of the present invention.
Fig. 2 is a flowchart of a wireless energy transmission method according to an embodiment of the present invention.
Fig. 3a is a schematic diagram of an energy transmission node in a pipeline according to an embodiment of the invention.
Fig. 3b is a cross-sectional view of the energy delivery node of fig. 3a in a pipeline.
Figure 3c is a side view of the energy delivery node of figure 3a in a pipeline.
Fig. 4 is a schematic diagram of an energy transmission node and an energy receiving node in a pipeline during a wireless energy transmission test according to an embodiment of the present invention.
Fig. 5a is a graph of the output power of the energy transfer node of fig. 4 at the first energy receiving node when energy is transferred using the energy transfer method of the present invention and using other energy transfer methods.
Fig. 5b is a graph of the output power of the energy transfer node of fig. 4 at the second energy receiving node when energy is transferred using the energy transfer method of the present invention and using other energy transfer methods.
Fig. 5c is a graph of the output power of the energy transfer node of fig. 4 at the third energy-receiving node when energy is transferred using the energy transfer method of the present invention and using other energy transfer methods.
Detailed Description
The technical solutions of the present invention are further illustrated by the following specific embodiments, but the present invention is not limited thereto.
The invention discloses a method for generating energy receiving node detection signals and a wireless energy transmission method, which are suitable for wirelessly transmitting energy to a plurality of energy receiving nodes by an energy transmission node, so that in places where energy supply cannot be performed on devices (such as sensors) in a wired mode through cables and the like, the traditional wired energy supply mode is replaced to supply energy to the devices needing energy supply, and normal work of the devices is ensured.
The first embodiment is as follows:
referring to fig. 1, fig. 1 shows a method for generating a probe signal of a enabled node according to an embodiment of the present invention, which includes the following steps:
(1) acquiring a plurality of OVSF codes;
(2) respectively carrying out pulse position modulation on the OVSF codes to generate a plurality of pulse modulation signals;
(3) and distributing a plurality of pulse modulation signals to a plurality of energy-receiving nodes as detection signals of the energy-receiving nodes, wherein each energy-receiving node corresponds to one pulse modulation signal.
In this embodiment, each OVSF code includes a plurality of chips, each chip corresponds to a pulse signal, and the pulse signals are pulse position modulated to generate pulse modulated signals.
In particular, in this embodiment, based on a formula
Generating a pulse modulation signal; wherein x isn(t) is the nth pulse modulated signal,
representing a convolution operation, g (t) is an impulse signal,
is the value of the mth chip of the nth OVSF code, M is the length of the nth OVSF code,
is the position of the pulse signal corresponding to the mth chip, t is the time, t0For a custom time interval, δ (t) is the ideal impulse response.
In this embodiment, each OVSF code includes 64 chips, i.e., M is 64, although in other embodiments, the length M of the OVSF code may be other values; each OVSF code includes chip "1" and chip "-1", i.e., is
The value of (1) or (1) and each OVSF code consists of chips '1' and chips '-1' which are arranged according to different orders.
In the present embodiment, based on the formula
Generating a pulse signal; wherein g (t) is a pulse signal, wcIs the center frequency, T, of the pulse signalgIs the width of the pulse signal, t is the time, AgIs the amplitude of the pulse signal. In particular, TgIs 0.05ms, t0Is 0.167ms, wcIs 40kHz, AgIs 2.5V, although the specific implementation is not limited thereto.
Example two:
referring to fig. 2, fig. 2 shows a wireless energy transmission method according to an embodiment of the present invention, which includes the following steps:
(1) providing a plurality of OVSF codes;
(2) respectively carrying out pulse position modulation on the OVSF codes to generate a plurality of pulse modulation signals;
(3) distributing a plurality of pulse modulation signals to a plurality of energy-receiving nodes to serve as detection signals of the energy-receiving nodes, wherein each energy-receiving node corresponds to one pulse modulation signal;
(4) the energy receiving node sends the detection signal to the energy transmission node so that the energy transmission node obtains an acquisition signal corresponding to the detection signal;
(5) the energy transmission node performs correlation operation on the acquired signal and the detection signal of the energy receiving node to generate an energy transmission signal;
(6) and sending the energy transmission signal to the corresponding energy receiving node to supply energy to the energy receiving node.
In this embodiment, each OVSF code includes a plurality of chips, each chip corresponds to a pulse signal, and the pulse signals are pulse position modulated to generate pulse modulated signals.
In particular, in this embodiment, based on a formula
Generating a pulse modulation signal; wherein x isn(t) is the nth pulse modulated signal,
representing a convolution operation, g (t) is an impulse signal,
is the value of the mth chip of the nth OVSF code, M is the length of the nth OVSF code,
is the position of the pulse signal corresponding to the mth chip, t is the time, t0For a custom time interval, δ (t) is the ideal impulse response.
In this embodiment, each OVSF code includes 64 chips, i.e., M is 64, although in other embodiments, the length M of the OVSF code may be other values; each OVSF code includes chip "1" and chip "-1", i.e., is
The value of (1) or (1) and each OVSF code consists of chips '1' and chips '-1' which are arranged according to different orders.
In the present embodiment, based on the formula
Generating a pulse signal; wherein g (t) is a pulse signal, wcIs the center frequency of the pulse signal, is the width of the pulse signal, t is the time, AgIs the amplitude of the pulse signal. In particular, TgIs 0.05ms, t0Is 0.167ms, wcIs 40kHz, AgIs 2.5V, although the specific implementation is not limited thereto.
Referring to fig. 3a, in the present embodiment, the energy transmission node 10 is an energy transmission array including a plurality of energy transmission units 101, and the energy transmission signals are generated by superimposing signals generated by performing correlation operations on the collected signals and the detection signals of the energy receiving nodes by the plurality of energy transmission units 101, respectively. Because the detection signals are not related to each other, when the energy is transmitted to the energy receiving node by the plurality of energy transmission units 101, the interference signals can be inhibited by each energy transmission unit 101, and the acquisition signals obtained by each energy transmission unit 101 are synchronous with each other; in the energy transmission process, the signals transmitted by each energy transmission unit 101 can be well compensated, and at the energy receiving node, the signals of each energy transmission unit 101 have the same waveform and the same arrival time, so that the signals transmitted by each energy transmission unit 101 are mutually superposed at the energy receiving node, so that the energy receiving node can obtain an enhanced energy transmission signal, and the energy transmission efficiency is further improved.
Specifically, in this embodiment, the energy transmission node 10 is an energy transmission array including 16 energy transmission units 101, every four energy transmission units 101 form an energy transmission group, two adjacent energy transmission units 101 in each energy transmission group are at an angle of 90 degrees, and the distance between two adjacent energy transmission groups is 5cm, as shown in fig. 3a to 3 c. Of course, the number, arrangement, and spacing of the energy transmission units 101 are not limited in the specific implementation.
Referring to fig. 4, fig. 4 is a schematic diagram of an embodiment of an energy transmission node 10 and each energy receiving node in a pipeline 200, where three energy receiving nodes are disposed on the pipeline 200. For convenience of description, the three enabled nodes are referred to as a first enabled node 20, a second enabled node 30 and a third enabled node 40, respectively, where the first enabled node 20 is disposed on the left side of the energy transmission node 10, the second enabled node 30 and the third enabled node 40 are disposed on the right side of the energy transmission node 10, and the second enabled node 30 is located between the third enabled node 40 and the energy transmission node 10. The 16 energy transmission units 101 are installed at different positions of the pipeline 200, each energy transmission unit 101 sends stress wave energy (energy transmission signal) through a piezoelectric transducer, and the first energy receiving node 20, the second energy receiving node 30 and the third energy receiving node 40 are provided with piezoelectric sheets to collect stress wave signals.
The following describes the output power obtained by the first, second, and third enabled nodes 20, 30, and 40 when the present invention is energized, by taking the energy transfer node 10 as an energy transfer array including 16 energy transfer units 101, and the average power transmitted by the energy transfer node 10 as 20 dBm. Fig. 5a shows a graph of the output power of each energy transmission group of the energy transmission node 10 at the first energy receiving node 20 when the energy transmission method of the present invention is used and the energy transmission is performed on the first energy receiving node 20 by using the pulse waveform and the time reversal waveform, and it can be known from fig. 5a that the average output power obtained at the first energy receiving node 20 when the energy transmission is performed by using the present invention is 10dBm (i.e. 10 times) higher than that obtained by using the other two energy transmission waveforms. Fig. 5b shows a graph of output power of each energy transmission group of the energy transmission node 10 at the second energy receiving node 30 when the energy transmission method of the present invention and the energy transmission of the second energy receiving node 30 are performed by using the pulse waveform and the time reversal waveform, and it can be known from fig. 5b that the average output power obtained at the second energy receiving node 30 is 15dBm (about 32 times) higher than the energy transmission by using the pulse waveform and 11dBm (about 13 times) higher than the energy transmission by using the time reversal waveform when the energy transmission method of the present invention is performed. Fig. 5c shows a graph of the output power of each energy transmission group of the energy transmission node 10 at the third energy receiving node 40 when the energy transmission method of the present invention is used and the energy transmission is performed on the third energy receiving node 40 by using the pulse waveform and the time reversal waveform, and it can be known from fig. 5c that the average output power obtained at the third energy receiving node 40 when the energy transmission is performed by using the present invention is 15dBm (about 32 times) higher than that obtained by using the other two energy transmission waveforms. Therefore, the energy transmission method can greatly improve the energy transmission efficiency.
Compared with the prior art, the invention utilizes the OVSF code to carry out pulse position modulation to generate a plurality of groups of pulse modulation signals which are mutually irrelevant, each energy receiving node adopts different pulse modulation signals as the detection signal thereof, and the proportion of signal energy corresponding to a target energy receiving node in the energy transmission signal is enhanced by carrying out relevant operation on the acquired signal and the detection signal at the energy transmission node, thereby greatly improving the energy at the target energy receiving node and improving the directional energy transmission efficiency of the energy transmission node; moreover, by pulse position modulation of the OVSF code, broadband energy transmission can be achieved. In addition, because the detection signals of all the energy receiving nodes are not related to each other, energy can be transmitted to the energy receiving nodes through a plurality of energy transmission units together, and the signals transmitted by all the energy transmission units are overlapped with each other at the energy receiving nodes, so that the energy receiving nodes can obtain enhanced energy transmission signals, and the energy transmission efficiency is further improved. In addition, the invention does not need to detect the detection signal of each energy receiving node independently, and can improve the energy of the area where the target energy receiving node is located under the condition of lacking the information such as the position, the channel and the like of the target energy transmission node, thereby greatly shortening the energy transmission time and improving the reaction speed.
The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the present invention, which is therefore intended to cover all equivalent changes and modifications within the scope of the present invention.
Claims (10)
1. A method for generating a probe signal of an energy receiving node is suitable for wireless energy transmission of a plurality of energy receiving nodes by an energy transmission node, and is characterized by comprising the following steps:
(1) acquiring a plurality of OVSF codes;
(2) respectively carrying out pulse position modulation on the OVSF codes to generate a plurality of pulse modulation signals;
(3) and distributing a plurality of pulse modulation signals to a plurality of the energy-bearing nodes as the detection signals of the energy-bearing nodes, wherein each energy-bearing node corresponds to one pulse modulation signal.
2. The method as claimed in claim 1, wherein each OVSF code comprises a plurality of chips, each chip corresponds to a pulse signal, and the pulse modulated signal is generated by pulse position modulating a plurality of pulse signals.
3. The method of claim 2, wherein the pulse modulated signal is generated based on the following equation,
wherein x isn(t) is the n-thThe pulse-modulated signal is then transmitted to the receiver,
representing a convolution operation, g (t) is the pulse signal,
is the value of the mth chip of the nth OVSF code, M is the length of the nth OVSF code,
is the position of the pulse signal corresponding to the mth chip, t is the time, t0For a custom time interval, δ (t) is the ideal impulse response.
4. An apparatus for generating an enabled node probe signal, comprising a processor, a memory, and one or more computer programs stored in the memory and configured to be executed by the processor, when executing the computer programs, performing the method of generating an enabled node probe signal according to any one of claims 1 to 3.
5. A computer-readable storage medium, comprising one or more computer programs for use in conjunction with an energy-enabled node probing signal generating apparatus, the computer programs being executable by a processor to perform the method of generating an energy-enabled node probing signal according to any of claims 1 to 3.
6. A wireless energy transmission method is suitable for wireless energy transmission of a plurality of energy receiving nodes by an energy transmission node, and is characterized by comprising the following steps:
(1) providing a plurality of OVSF codes;
(2) respectively carrying out pulse position modulation on the OVSF codes to generate a plurality of pulse modulation signals;
(3) distributing a plurality of pulse modulation signals to a plurality of the energy-receiving nodes as detection signals of the energy-receiving nodes, wherein each energy-receiving node corresponds to one pulse modulation signal;
(4) the energy receiving node sends the detection signal to the energy transmission node so that the energy transmission node obtains an acquisition signal corresponding to the detection signal;
(5) the energy transmission node carries out correlation operation on the acquisition signal and the detection signal of the energy receiving node to generate an energy transmission signal;
(6) and sending the energy transmission signal to the corresponding energy receiving node to supply energy to the energy receiving node.
7. The method of claim 6, wherein each of said OVSF codes comprises a plurality of chips, each of said chips corresponding to a pulse signal, and wherein said pulse signals are pulse position modulated to generate said pulse modulated signals.
8. The wireless energy transmission method according to claim 7, wherein the pulse signal is generated based on the following formula,
wherein g (t) is the pulse signal, wcIs the center frequency, T, of the pulse signalgIs the width of the pulse signal, t is the time, AgIs the amplitude of the pulse signal.
9. The wireless energy transfer method according to claim 7, wherein the pulse modulated signal is generated based on the following formula,
wherein x isn(t) is the nth said pulse modulated signal,
representing a convolution operation, g (t) is the pulse signal,
is the value of the mth chip of the nth OVSF code, M is the length of the nth OVSF code,
is the position of the pulse signal corresponding to the mth chip, t is the time, t0For a custom time interval, δ (t) is the ideal impulse response.
10. The wireless energy transmission method according to any one of claims 6 to 9, wherein the energy transmission node is an energy transmission array including a plurality of energy transmission units, and the energy transmission signal is generated by superimposing signals generated by correlating the collected signal and the detection signal of the energy receiving node by the plurality of energy transmission units.
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