CN114339598A - UWB imaging positioning method and system based on time reversal - Google Patents
UWB imaging positioning method and system based on time reversal Download PDFInfo
- Publication number
- CN114339598A CN114339598A CN202111662009.5A CN202111662009A CN114339598A CN 114339598 A CN114339598 A CN 114339598A CN 202111662009 A CN202111662009 A CN 202111662009A CN 114339598 A CN114339598 A CN 114339598A
- Authority
- CN
- China
- Prior art keywords
- propagation
- uwb
- base station
- time
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The embodiment of the invention discloses a UWB imaging positioning method and a system based on time reversal, wherein the method comprises the following steps: the UWB terminal sends a UWB detection signal to an indoor space, wherein the indoor space is provided with a plurality of base station array units; each base station array unit in the indoor space captures UWB detection signals and performs time reversal on the captured UWB detection signals to obtain corresponding time reversal signals; all base station array units send respective time reversal signals to a space propagation simulation model in target computer equipment; the target computer device simulates the propagation paths of the time reversal signals of all the base station array units in the space propagation simulation model, and generates a space propagation intensity graph corresponding to the propagation paths according to the propagation paths; and all the spatial propagation intensity maps are subjected to normalization processing to generate an imaging pixel map, and the position of the UWB terminal is confirmed according to the pixel imaging map. The invention can improve the accuracy of positioning the UWB terminal.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a UWB imaging positioning method and system based on time reversal.
Background
The Ultra Wide Band (UWB) technology is a wireless carrier communication technology, which does not adopt sinusoidal carrier, but utilizes nanosecond-level non-sinusoidal narrow pulse to transmit data, so that the occupied frequency spectrum range is Wide, and the UWB technology has the advantages of low system complexity, low power spectrum density of transmitted signals, insensitivity to channel fading, low interception capability, high positioning accuracy and the like, and is particularly suitable for high-speed wireless access in dense multipath places such as indoor places. However, in the current method for positioning the position of the UWB terminal, generally, the base station transmits a probe signal, the UWB terminal captures the probe signal and returns the probe signal, and the position of the UWB terminal is positioned according to the round trip time of the probe signal.
Disclosure of Invention
The embodiment of the invention provides a time reversal-based UWB imaging positioning method and system, which improve the positioning accuracy of a UWB terminal.
In a first aspect, an embodiment of the present invention provides a time reversal based UWB imaging positioning method, where the method includes:
the UWB terminal sends a UWB detection signal to an indoor space, wherein the indoor space is provided with a plurality of base station array units;
each base station array unit in the indoor space captures the UWB detection signal and performs time reversal on the captured UWB detection signal to obtain a corresponding time reversal signal;
all the base station array units send respective time reversal signals to a space propagation simulation model in target computer equipment;
the target computer device simulates propagation paths of time-reversal signals of all the base station array units in the spatial propagation simulation model, and generates a spatial propagation intensity map corresponding to the propagation paths according to the propagation paths, wherein the spatial propagation intensity map is used for reflecting the propagation signal intensities of the time-reversal signals sent by the corresponding base station array units at different moments, and one spatial propagation intensity map corresponds to one base station array unit;
and normalizing all the spatial propagation intensity maps to generate an imaging pixel map, and confirming the position of the UWB terminal according to the pixel imaging map.
In a second aspect, the embodiment of the present invention further provides a UWB imaging positioning system based on time reversal, where the system includes a UWB terminal, a pixel imaging generation device, and a plurality of base station array units; the system is used for realizing the UWB imaging positioning method based on time reversal in any one of the above embodiments.
The embodiment of the invention provides a UWB imaging positioning method and a UWB imaging positioning system based on time reversal. Wherein the method comprises the following steps: the UWB terminal sends a UWB detection signal to an indoor space, wherein the indoor space is provided with a plurality of base station array units; each base station array unit in the indoor space captures the UWB detection signal and performs time reversal on the captured UWB detection signal to obtain a corresponding time reversal signal; all the base station array units send respective time reversal signals to a space propagation simulation model in target computer equipment; the target computer device simulates propagation paths of time-reversal signals of all the base station array units in the spatial propagation simulation model, and generates a spatial propagation intensity map corresponding to the propagation paths according to the propagation paths, wherein the spatial propagation intensity map is used for reflecting the propagation signal intensities of the time-reversal signals sent by the corresponding base station array units at different moments, and one spatial propagation intensity map corresponds to one base station array unit; and all the space propagation intensity maps are subjected to normalization processing to generate an imaging pixel map, and the position of the UWB terminal is confirmed according to the pixel imaging map. The invention adopts a UWB terminal to send a UWB detection signal, a base station array unit carries out time reversal processing on the UWB detection signal to obtain a time reversal signal when receiving the UWB detection signal, sends the time reversal signal to a space propagation simulation model, simulates the propagation path of the time reversal signal corresponding to each base station through the space propagation simulation model, and generates a corresponding space propagation intensity map according to the propagation path, namely, one base station array unit corresponds to one propagation path, one propagation path corresponds to one space propagation intensity map, the space propagation intensity map reflects the position of the time reversal signal in the propagation process and the intensity of the propagation signal, all the space propagation intensity maps are normalized to obtain a pixel imaging map, and finally, the position of the UWB terminal is confirmed according to the pixel imaging map, thereby avoiding returning the UWB detection signal to the UWB terminal, the accuracy of positioning the UWB terminal is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a UWB imaging positioning method based on time reversal according to an embodiment of the invention;
FIG. 2 is a mathematical flow chart for generating a time-reversal signal of a UWB imaging positioning method based on time reversal according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an indoor space of a UWB imaging positioning method based on time reversal provided by an embodiment of the invention;
fig. 4 is a pixel imaging diagram of a UWB imaging positioning system based on time reversal provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic flowchart of a UWB imaging positioning method based on time reversal according to an embodiment of the present invention. As shown in fig. 1, the method includes steps S110 to S150.
And S110, the UWB terminal sends a UWB detection signal to an indoor space, wherein the indoor space is provided with a plurality of base station array units.
And S120, each base station array unit in the indoor space captures the UWB detection signal and performs time reversal on the captured UWB detection signal to obtain a corresponding time reversal signal.
And S130, all the base station array units send respective time reversal signals to a space propagation simulation model in target computer equipment.
In the embodiment of the invention, the UWB terminal sends UWB detection signals to all directions of the indoor space, the base station array unit can capture the UWB detection signals and perform time reversal processing on the UWB detection signals to obtain time reversal signals. Time-reversal, which is the transformation of changing sign of a time coordinate while keeping a space coordinate constant, refers to a kind of inverse operation on a time domain signal, which reverses the signal back and forth in the order of arrival at a receiving point. In the frequency domain, it is equivalent to phase conjugation. According to the reciprocity principle, time reversal has a space-time focusing characteristic, which is embodied as follows: after time reversal processing is carried out on received signals measured at multiple points in space, the obtained multipath time reversal signals can pass through a complex medium in a self-adaptive mode without prior knowledge and can be superposed to obtain maximum energy (space focusing characteristic) at the excitation point of the original space transmitting signal at the same time, and a focusing signal (time focusing characteristic) similar to the reverse time domain waveform of the original transmitting signal is formed.
As shown in fig. 2, which is a time reversal mathematical description process, the input signal x (t) refers to a detection signal sent by a UWB terminal, the transfer function h (t) refers to a medium for transferring the detection signal between the UWB terminal and the base station array unit, and the base station array unit sends the time reversal signal to the spatial propagation simulation model after performing time reversal processing on the detection signal. The spatial propagation simulation model is a model simulating a time reversal signal propagation path, and can confirm the propagation path of the time reversal signal and the corresponding propagation signal intensity in the process of simulating the time reversal signal propagation, and meanwhile, in order to position the UWB terminal through the propagation paths of all the time reversal signals, the spatial propagation simulation model associates the propagation signal intensity and coordinate points with pixel values, and can judge the position of the UWB terminal according to the pixel values, and the specific process is described later.
S140, the target computer device simulates propagation paths of time-reversal signals of all the base station array units in the spatial propagation simulation model, and generates a spatial propagation strength map corresponding to the propagation paths according to the propagation paths, where the spatial propagation strength map is used to reflect propagation signal strengths of the time-reversal signals sent by the corresponding base station array units at different times, and one spatial propagation strength map corresponds to one base station array unit.
In some embodiments, such as this embodiment, the step of the target computer device simulating the propagation paths of the time-reversed signals of all the base station array units in the spatial propagation simulation model may include the steps of: generating simulated positions of all the base station array units in the indoor space in the space propagation simulation model; confirming a base station array unit sending the time reversal signals according to the received time reversal signals, and confirming the simulation position of the base station array unit sending the time reversal signals in the space propagation simulation model; simulating and transmitting a time reversal signal matched with the base station array unit by taking the simulation position as a starting point; and simulating the propagation path according to the propagation process of the time reversal signals in the space propagation simulation model.
In the embodiment of the present invention, the spatial propagation simulation model is used to simulate the positions of the base station array unit, the UWB terminal and the target computer device in an indoor environment, when the spatial propagation simulation model receives a time reversal signal, the base station array unit that sends out the time reversal signal is determined, a corresponding simulated position is generated in the spatial propagation simulation model, and then the time reversal signal sent out by the base station array unit is sent out from the simulated position to simulate the propagation of the time reversal signal, that is, the time reversal signal will propagate in the spatial propagation simulation model and form a corresponding propagation path, that is, one base station array unit corresponds to one time reversal signal, and one time reversal signal corresponds to one propagation path.
In some embodiments, for example, in this embodiment, the step of generating the simulated positions of all the base station array units in the indoor space in the spatial propagation simulation model may include the following steps: acquiring the physical positions of all the base station array units in the indoor space; and generating corresponding simulation positions in the space propagation simulation model according to the physical positions of all the base station array units.
In the embodiment of the invention, the spatial propagation simulation model can acquire the physical positions of the base station array unit and the base station array unit in the indoor environment, and generate a matched simulation position in the spatial propagation simulation model according to the physical positions.
In some embodiments, for example, in this embodiment, the step of generating the spatial propagation strength map corresponding to the propagation path according to the propagation path may include the following steps: confirming the propagation paths of all the time reversal signals in the space propagation model, and confirming the coordinate point passed by each propagation path; confirming the propagation signal intensity corresponding to each coordinate point, and generating a space propagation intensity map matched with the propagation path.
In the embodiment of the present invention, the propagation path is generated according to the process of propagating the time-reversal signal in the spatial propagation simulation model, and the spatial propagation simulation model has a corresponding coordinate for each point, so after the propagation path is confirmed, the coordinate point where the propagation path is routed can be confirmed, and meanwhile, the spatial propagation simulation model can also simulate the propagation signal strength of the time-reversal signal in the propagation process, so that for each coordinate point, a propagation signal strength can be corresponded, and a spatial propagation strength map is generated according to the propagation signal strength of each coordinate point, that is, one propagation path corresponds to one spatial propagation strength map.
S150, normalizing all the space propagation intensity maps to generate an imaging pixel map, and confirming the position of the UWB terminal according to the pixel imaging map.
In the embodiment of the invention, the principle of generating the pixel imaging graph in the space propagation simulation model is as follows: n base station display units are arranged, and the coordinate of the pixel model space in the space propagation simulation model is Pn(1≤n≤N)，PnThe coordinates of a certain base station array unit are represented,coordinate of UWB terminal is PdThe transfer function between the UWB terminal and the base station display unit is h (p)d,pnT) in the frequency domain of the transfer function H (P)d,Pnω). If the sounding signal sent by the UWB terminal is X (t), the frequency domain form of the sounding signal is X (ω). After the base station array unit sends out the time reversal signal, the coordinate of the space propagation simulation model (target computer equipment) is PkThen the space propagation simulation model receives the data from the station PnThe time-reversal signal of (a) is:
by performing inverse Fourier transform on the formula (1), the method can be obtained
Time domain representation of (a):
rewriting formula (2) to the following form:
wherein the content of the first and second substances,
is that
The phase function of (a); to the formula (3)
Defining a magnitude function cn(pk,t)：
Wherein, ω is0Is the working frequency of the detection signal;
c is ton(pkT) can be obtained by substituting formula (3):
as can be seen from equation (4), the simulation model p for spatial propagationkPoint, which received from PnThe propagation signal of the base station array unit reaches the maximum value
The time of (a) is:
then, formula (1) is substituted for formula (2) to give:
in the formula (6), θ (ω) is the phase of X (ω), φn(pk,pnω) is H (p)k,pnω) of the phase phin(pd,pnω) is H (p)d,pnω) phase;
thus, according to equations (3) and (6), it is possible to obtain:
when p iskAt the target, i.e. pk＝pdWhen the temperature of the water is higher than the set temperature,
can be obtained by the following formula (5),
from the formula (7), located at PnThe time when the time-reversal signal sent by the base station array unit reaches the maximum value at the target and T and theta' (omega)0) In respect of received signal intercept length and initial target scattered signal phase, independently of the position and propagation path of the base station array unit, i.e.
Therefore, we have a characteristic of the time-reversal focusing signal at the target, that is, the time for the time-reversal signals of the respective base station array units to reach the maximum value at the target is the same, that is, the focusing time is the same. According to the characteristic, time reversal imaging can be independently carried out on each base station unit, and the imaging results of multiple paths are further processed to obtain the imaging information of the UWB terminal.
According to the calculation principle, the time of the time reversal signals of each base station array unit reaching the maximum value at the target position is the same, so that the time reversal signals can be obtained by independently carrying out time reversal processing on the detection signals through the base station units, all the time reversal signals are concentrated in a space propagation simulation model, all the time reversal signals are calculated through the space propagation simulation model to obtain the coordinates of the pixel points of each array unit, a pixel imaging graph is generated according to the coordinates of the pixel points, and the UWB terminal position is confirmed according to the pixel imaging graph.
In some embodiments, for example, in this embodiment, the step of normalizing the spatial propagation intensity map to generate an imaging pixel map may include the steps of: confirming the propagation signal intensity corresponding to each coordinate point according to the space propagation intensity graph, and carrying out normalization processing on each propagation signal intensity to obtain a signal intensity value corresponding to the coordinate point; and generating the pixel imaging graph according to all the signal intensity values.
In the embodiment of the present invention, as can be seen from the foregoing, the spatial propagation strength map is generated from the propagation signal strengths corresponding to the coordinate points through which the propagation paths of the time-reversal signals propagate in the spatial propagation simulation model, and one propagation signal strength corresponds to each coordinate point through which the propagation path passes in the spatial propagation simulation model. The propagation paths of different time reversal signals may have overlapped parts, namely parts with the same coordinates, in the space propagation simulation model, the propagation signal intensity corresponding to the parts with the same coordinates is normalized to obtain a signal intensity value corresponding to the coordinates, and a pixel imaging graph is generated according to the signal intensity values of all coordinate points.
In some embodiments, for example, in this embodiment, the step of normalizing each of the propagation signal intensities to obtain a signal intensity value corresponding to the coordinate point may include the following steps: multiplying the propagation signal intensities with the same coordinate and the same propagation time to obtain an intermediate propagation signal intensity; adding the intermediate propagated signal strengths having different propagation times to obtain the signal strength value; and generating the pixel imaging graph according to the signal intensity value.
The step of generating the pixel imaging map according to the signal intensity value may include the steps of: confirming and generating the position of a pre-estimated pixel point in the space propagation simulation model according to the coordinate point corresponding to the signal intensity value; and confirming the pixel value of the pre-estimated pixel point according to the signal intensity value and generating the pre-estimated pixel point, wherein the plurality of pre-estimated pixel points form the pixel imaging graph.
In the embodiment of the present invention, as can be seen from the foregoing, a plurality of time reversal cleaning corresponds to a plurality of propagation paths in the spatial propagation simulation model, and there are overlapping portions between different propagation paths, while in general, propagation paths overlap only near the UWB terminal, that is, more overlapping portions indicate positions closer to the UWB terminal. The propagation signal strengths of all coordinate points can be confirmed according to the spatial propagation strength map, and the propagation signal strengths corresponding to the coordinate points having the same coordinate and the same propagation time are multiplied to obtain an intermediate propagation signal strength, for example, if the propagation signal strengths corresponding to the three coordinate points having the same coordinate and the same propagation time are a, b, and c, respectively, the multiplication results of the propagation signal strengths corresponding to the three coordinate points having the same coordinate and the same propagation time are abc, wherein the propagation time refers to the time length of the time reversal signal propagating in the spatial propagation simulation model. Since the propagation signal intensities corresponding to the coordinate points having the same coordinate and the same propagation time are multiplied, the intermediate propagation signal intensities corresponding to all the coordinates having the same coordinate and different propagation times are added by a plurality of intermediate propagation signal intensities to obtain a signal intensity value corresponding to the coordinate corresponding to different propagation times, and finally, a pixel imaging graph is generated according to the signal intensity values of all the coordinates, wherein the specific process is as follows: confirming the coordinates of the pre-estimated pixel points according to the coordinates of the signal intensity values, adjusting the pixel values of the pre-estimated pixel points according to the signal intensity values, and finally generating the pre-estimated pixel points, wherein the signal intensity values correspond to the pre-estimated pixel points.
As shown in fig. 3 and 4, fig. 3 is a physical position of a base station array unit and a UWB terminal in an indoor environment, a middle black dot indicates the UWB terminal, four black dots surrounding the UWB terminal are the base station array unit, fig. 4 is a pixel imaging diagram, the middle four black dots indicate estimated pixel points finally generated, and it can be seen that the four black dots are all at a center position of the pixel imaging diagram and are substantially the same as the physical position of the UWB terminal.
In some embodiments, for example, in this embodiment, the step of confirming the position of the UWB terminal according to the pixel imaging map may include the steps of: acquiring the numerical values of all the signal intensity values; and taking a coordinate point corresponding to the signal intensity value with the largest value in all the signal intensity values as the position of the UWB terminal.
In the embodiment of the present invention, the greater the signal strength value, the closer to the UWB terminal is indicated, and therefore, the coordinate corresponding to the signal strength value having the largest value may be used as the position of the UWB terminal.
In a second aspect, the present invention also provides a time-reversal UWB imaging positioning system, which includes a UWB terminal, a pixel imaging generation device, and a plurality of base station array units; the system is used for realizing the UWB imaging positioning method based on time reversal in any embodiment.
Further, the space propagation simulation model simulates the position of the base station array unit through a coordinate system.
In the embodiment of the invention, the UWB terminal sends UWB detection signals to all directions of the indoor space, the base station array unit can capture the UWB detection signals and perform time reversal processing on the UWB detection signals to obtain time reversal signals. The spatial propagation simulation model may be loaded in a computer, notebook, or other intelligent device. The space propagation simulation model is used for simulating the positions of the base station array unit, the UWB terminal and the pixel imaging generation equipment in an indoor environment, when the space propagation simulation model receives a time reversal signal, the time reversal signal confirms the base station array unit sending the time reversal signal, a corresponding simulation position is generated in the space propagation simulation model, then the time reversal signal sent by the base station array unit is sent out from the simulation position to simulate the transmission of the time reversal signal, and a corresponding propagation path is generated. The space propagation simulation model is provided with a coordinate system, and the coordinate system takes pixel values as an abscissa and an ordinate. The spatial propagation simulation model can acquire the physical positions of the base station array unit and the base station array unit in the indoor environment, and generate a matched simulation position in the spatial propagation simulation model according to the physical positions.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs. The units in the device of the embodiment of the invention can be merged, divided and deleted according to actual needs. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a storage medium. Based on such understanding, the technical solution of the present invention essentially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device to execute all or part of the steps of the method according to the embodiments of the present invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, while the invention has been described with respect to the above-described embodiments, it will be understood that the invention is not limited thereto but may be embodied with various modifications and changes.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A UWB imaging positioning method based on time reversal, characterized in that the method comprises:
the UWB terminal sends a UWB detection signal to an indoor space, wherein the indoor space is provided with a plurality of base station array units;
each base station array unit in the indoor space captures the UWB detection signal and performs time reversal on the captured UWB detection signal to obtain a corresponding time reversal signal;
all the base station array units send respective time reversal signals to a space propagation simulation model in target computer equipment;
the target computer device simulates propagation paths of time-reversal signals of all the base station array units in the spatial propagation simulation model, and generates a spatial propagation intensity map corresponding to the propagation paths according to the propagation paths, wherein the spatial propagation intensity map is used for reflecting the propagation signal intensities of the time-reversal signals sent by the corresponding base station array units at different moments, and one spatial propagation intensity map corresponds to one base station array unit;
and normalizing all the spatial propagation intensity maps to generate an imaging pixel map, and confirming the position of the UWB terminal according to the pixel imaging map.
2. The time-reversal based UWB imaging localization method of claim 1, said target computer device simulating the propagation paths of time-reversed signals of all of said base station array units in said spatial propagation simulation model, comprising:
generating simulated positions of all the base station array units in the indoor space in the space propagation simulation model;
confirming a base station array unit sending the time reversal signals according to the received time reversal signals, and confirming the simulation position of the base station array unit sending the time reversal signals in the space propagation simulation model;
simulating and transmitting a time reversal signal matched with the base station array unit by taking the simulation position as a starting point;
and simulating the propagation path according to the propagation process of the time reversal signals in the space propagation simulation model.
3. The time-reversal based UWB imaging location method of claim 2 wherein the step of generating simulated positions of all the base station array units in the indoor space in the spatial propagation simulation model comprises:
acquiring the physical positions of all the base station array units in the indoor space;
and generating corresponding simulation positions in the space propagation simulation model according to the physical positions of all the base station array units.
4. The time-reversal based UWB imaging location method of claim 1 wherein the step of generating a spatial propagation strength map corresponding to the propagation path from the propagation path comprises:
confirming the propagation paths of all the time reversal signals in the space propagation model, and confirming the coordinate point passed by each propagation path;
confirming the propagation signal intensity corresponding to each coordinate point, and generating a space propagation intensity map matched with the propagation path.
5. The time-reversal based UWB imaging location method of claim 4 wherein the step of normalizing the spatial propagation intensity map to generate an imaging pixel map comprises:
confirming the propagation signal intensity corresponding to each coordinate point according to the space propagation intensity graph, and carrying out normalization processing on each propagation signal intensity to obtain a signal intensity value corresponding to the coordinate point;
and generating the pixel imaging graph according to all the signal intensity values.
6. The time-reversal based UWB imaging location method of claim 5 wherein the step of normalizing each of the propagated signal strengths to obtain a signal strength value corresponding to the coordinate point comprises:
multiplying the propagation signal intensities with the same coordinate and the same propagation time to obtain an intermediate propagation signal intensity;
adding the intermediate propagated signal strengths having different propagation times to obtain the signal strength value;
and generating the pixel imaging graph according to the signal intensity value.
7. The time-reversal based UWB imaging positioning method of claim 6 wherein the step of confirming the position of the UWB terminal from the pixel imaging map comprises:
acquiring the numerical values of all the signal intensity values;
and taking a coordinate point corresponding to the signal intensity value with the largest value in all the signal intensity values as the position of the UWB terminal.
8. The time-reversal based UWB imaging location method of claim 6 wherein the step of generating the imaging map of pixels from the signal intensity values comprises:
confirming and generating the position of a pre-estimated pixel point in the space propagation simulation model according to the coordinate point corresponding to the signal intensity value;
and confirming the pixel value of the pre-estimated pixel point according to the signal intensity value and generating the pre-estimated pixel point, wherein the plurality of pre-estimated pixel points form the pixel imaging graph.
9. A time reversal based UWB imaging positioning system, which is characterized by comprising a UWB terminal, a pixel imaging generation device and a plurality of base station array units, and is used for realizing the time reversal based UWB imaging positioning method according to any one of claims 1-8.
10. The time-reversal based UWB imaging location system of claim 9 wherein the spatial propagation simulation model models the location of the base station array unit via a coordinate system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111662009.5A CN114339598A (en) | 2021-12-31 | 2021-12-31 | UWB imaging positioning method and system based on time reversal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111662009.5A CN114339598A (en) | 2021-12-31 | 2021-12-31 | UWB imaging positioning method and system based on time reversal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114339598A true CN114339598A (en) | 2022-04-12 |
Family
ID=81020951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111662009.5A Pending CN114339598A (en) | 2021-12-31 | 2021-12-31 | UWB imaging positioning method and system based on time reversal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114339598A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050170778A1 (en) * | 2003-10-17 | 2005-08-04 | Fujitsu Component Limited | Pointing device and receiving unit with UWB signal |
| US20070205937A1 (en) * | 2006-03-03 | 2007-09-06 | Realtronics Corporation | Apparatus and Method to Identify Targets Through Opaque Barriers |
| CN101986756A (en) * | 2010-10-25 | 2011-03-16 | 电子科技大学 | Time-reversal signal-based wireless positioning scheme |
| US20150257167A1 (en) * | 2014-03-10 | 2015-09-10 | Origin Wireless Communications, Inc. | Time-reversal wireless paradigm for internet of things |
| US20160018508A1 (en) * | 2014-07-17 | 2016-01-21 | Origin Wireless Communications, Inc. | Wireless positioning systems |
| US20160266232A1 (en) * | 2013-10-25 | 2016-09-15 | Zte Corporation | Virtual Anchor Point-based Wireless Positioning Method and Device, and Terminal |
| CN207603651U (en) * | 2017-12-11 | 2018-07-10 | 云南电网有限责任公司红河供电局 | UWB Precise Position Systems with time-domain synchronizing device |
| CN111007487A (en) * | 2019-12-11 | 2020-04-14 | 西安电子科技大学 | Multi-base radar target detection method based on time reversal |
| CN111107626A (en) * | 2019-12-13 | 2020-05-05 | 重庆邮电大学 | DOA positioning method based on time reversal |
| CN111610202A (en) * | 2020-06-03 | 2020-09-01 | 西安电子科技大学 | Medium material damage detection system and method based on time reversal |
-
2021
- 2021-12-31 CN CN202111662009.5A patent/CN114339598A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050170778A1 (en) * | 2003-10-17 | 2005-08-04 | Fujitsu Component Limited | Pointing device and receiving unit with UWB signal |
| US20070205937A1 (en) * | 2006-03-03 | 2007-09-06 | Realtronics Corporation | Apparatus and Method to Identify Targets Through Opaque Barriers |
| CN101986756A (en) * | 2010-10-25 | 2011-03-16 | 电子科技大学 | Time-reversal signal-based wireless positioning scheme |
| US20160266232A1 (en) * | 2013-10-25 | 2016-09-15 | Zte Corporation | Virtual Anchor Point-based Wireless Positioning Method and Device, and Terminal |
| US20150257167A1 (en) * | 2014-03-10 | 2015-09-10 | Origin Wireless Communications, Inc. | Time-reversal wireless paradigm for internet of things |
| US20160018508A1 (en) * | 2014-07-17 | 2016-01-21 | Origin Wireless Communications, Inc. | Wireless positioning systems |
| CN207603651U (en) * | 2017-12-11 | 2018-07-10 | 云南电网有限责任公司红河供电局 | UWB Precise Position Systems with time-domain synchronizing device |
| CN111007487A (en) * | 2019-12-11 | 2020-04-14 | 西安电子科技大学 | Multi-base radar target detection method based on time reversal |
| CN111107626A (en) * | 2019-12-13 | 2020-05-05 | 重庆邮电大学 | DOA positioning method based on time reversal |
| CN111610202A (en) * | 2020-06-03 | 2020-09-01 | 西安电子科技大学 | Medium material damage detection system and method based on time reversal |
Non-Patent Citations (3)
| Title |
|---|
| 吴斯栋: "基于主动声发射法的金属绞线结构损伤成像监测机理研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》, pages 2 - 3 * |
| 张翼: "基于RSSI预测模型的TRM无线室内定位技术研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》, pages 2 * |
| 薛峰 等: "时间反演无线传感器网络节点定位方法研究", 《中国新通信》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wang et al. | Push the limit of acoustic gesture recognition | |
| Cui et al. | LOS/NLOS identification for indoor UWB positioning based on Morlet wavelet transform and convolutional neural networks | |
| Ho et al. | Passive source localization using time differences of arrival and gain ratios of arrival | |
| Zhang et al. | Joint range and velocity estimation with intrapulse and intersubcarrier Doppler effects for OFDM-based RadCom systems | |
| CN109669077A (en) | Antenna assembly and measurement method | |
| CN109039506B (en) | A kind of underwater mobile channel emulation mode | |
| JP4208717B2 (en) | Radio channel simulation method and device | |
| CN109452953A (en) | Method, apparatus, ultrasonic probe and the terminal of a kind of adjustment detection position | |
| CN113777575B (en) | MIMO radar multi-target parameter estimation evaluation method applied to complex environment | |
| Gong et al. | A machine learning-based approach for auto-detection and localization of targets in underwater acoustic array networks | |
| CN107942284A (en) | Underwater Wave arrival direction estimating method and device based on two-dimensional quadrature Nonuniform Linear Array | |
| Zhou et al. | Study of propagation channel characteristics for underwater acoustic communication environments | |
| CN106772324B (en) | A kind of method, underwater sound signal simulator and the Imaging sonar of underwater sound signal simulation | |
| Jiang et al. | Digital twin based beam prediction: Can we train in the digital world and deploy in reality? | |
| JP3718342B2 (en) | Wide area radio wave monitoring method and apparatus | |
| CN106125059B (en) | Nonparametric Combined estimator signal and the Passive Location of position | |
| Feng et al. | Time-reversal source reconstruction with space and time kurtoses | |
| Liu et al. | A shared cluster-based stochastic channel model for joint communication and sensing systems | |
| CN109932690A (en) | A kind of multi-target underwater acoustic positioning method based on received signal strength | |
| JP2002064440A (en) | Method and apparatus for monitoring radio wave | |
| CN114339598A (en) | UWB imaging positioning method and system based on time reversal | |
| Khan et al. | Review of computational techniques for performance evaluation of RF localization inside the human body | |
| US20100081426A1 (en) | Method for Classifying Radio Channels | |
| Chen et al. | Signal transmission using underwater acoustic vector transducers | |
| CN112255469B (en) | Antenna arbitrary curved surface near field test phase acquisition device and method without reference signal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |