RFID-based positioning method and device and electronic equipment

[0033] In order to make skilled in the art better understand the technical solutions of the embodiments of the present invention, in conjunction with the following drawings of the present invention embodiments, the technical solutions in the embodiments of the present invention will be clearly and completely described, obviously, the described Example embodiments are merely part of embodiments of the present invention embodiments, but not all. Based on the embodiments in the embodiment of the present invention, all other embodiments obtained by those of ordinary skill in the art, the present invention should belong to the scope of protection of the embodiment.

[0034] Sight propagation (line-of-sight propagation, LOS propagation) refers to the use of the propagation time between the ultrashort wave, and microwave communications for terrestrial broadcasting, which can reach space wave in two points. A distance in line of sight with the ground and the distance can be the Master of similar, but the path of sight propagation path can be referred to as direct. like figure 1 As shown, figure 1 It is a schematic diagram for LoS propagation and NLOS propagation. In the absence of other interferents, the signal sent through the transmission antenna and tag processing directly reflected to a receiving antenna, wherein a line of sight LOS propagation route that is, if the reflected signal is also passed to other objects (e.g., walls, floors, etc. etc.) before reaching the receiving antenna reflector ( figure 1 The propagation path 2 and 3), that is, a non-line of sight NLOS propagation, or other object through the transmission signal is reflected before reaching the label, such as figure 1 Propagation path 4, is also an NLOS NLOS propagation.

[0035] I.e., the formation of NLOS propagation multipath effects, when reading RFID tags, tag reading system will be such that a serious interference with the angle of arrival of the reflected signal, resulting in a large positioning error, leading to possible leakage string read or read. Based on this, the present embodiment provides a manual RFID-based positioning, to achieve precise positioning of the label.

[0036] like figure 2 As shown, figure 2 A system architecture diagram of the embodiment according to embodiments of the present application. In this system, comprising a positioning means, the positioning means comprises at least one of a transmitting antenna and at least one receiving antenna array, the receive antenna array includes M receive antennas, M being an integer greater than 1, each receiving antenna may be received in parallel. Note that, although the transmit and receive antennas are separated in the diagram, but in practical applications, both may be integrated in one functional block.

[0037] like Figure 3A As shown, Figure 3A The method of the present application is based on the positioning of the RFID process schematic embodiment includes one embodiment is provided:

[0038] S301,, transmitting the superposed signal, wherein the superimposing includes N signal detection frequency signal within a specified frequency band.

[0039] Transmit antenna transmits a special signal is superimposed, the superimposed signal contains N different frequency detection signals. For example, from f0, f1 to fN N signals. The spacing between the frequency may be regular, e.g., the interval between any two frequencies are equal; may be irregular, e.g., randomly selected N bins within a specified frequency band.

[0040]The specified frequency band can be selected according to actual needs. For example, in practical applications, 800-1000Mh is selected as the specified frequency band, and in order to avoid 2G signals to the interference of the present application, two interference bands are avoided from 870-885 MHz and 935-960 MHz. Obviously, the frequency bands here are only one example, and in practical applications, they can be based on the setup of the specified band and the interference band. When the interference channel is set, no more frequently falls into the range of the interference band in the transmitted superimposed signal.

[0041] When transmitting an overlay signal, the protocol stack of EPC Gen2 can be performed each time, but the transmit power outside the ISM (Industrial Scientific Medical band needs to be larger, so the communication distance is shorter; Execute an EPCGEN2 protocol stack in an ISM frequency (such as 915MHz), in other frequency points, the low power signal can be effectively improved, but the number of frequency points is relatively long when the number of frequencies; A ISM frequency point (such as 915MHz) performs the EPC Gen2 protocol stack, and the signal acquisition time can be further shortened by the other frequency point to simultaneously transmit and process multiple frequency points by custom hardware.

[0042] After the superimposed signal passes the modulation reflection of the RFID tag, the reflection signal can be generated to receive an antenna array reception.

[0043] S303, receives the RFID tag to the reflected signal of the laminated signal, determine the channel state information CSI of the reflected signal on the N frequency point.

[0044] The reflected signal also includes signals of n frequencies, in other words, channel state information, CSI) is the channel properties of the communication link. It describes how signals propagates in channels, combining multiple effects such as delay, amplitude attenuation, and phase offset, and describes the amplitude of the time domain of the reflection signal on each frequency point and the phase of the frequency domain. In other words, the amplitude and phase of the reflected signals on each frequency point are included in the CSI.

[0045] S305, based on the channel state information CSI obtains the channel impact response CIR of the signal intensity in the specified frequency band.

[0046] First, the frequency FourierTransform, IFFT can be measured, and the INVERSE FAST FOURTRANSFORM, INVER can be obtained, and the measurement channel impact response CIR can be obtained.

[0047] For the specified frequency band, even if there are some interference bands that have not been taken in advance, as long as the interference band (i.e., understand the intercept window in the specified frequency band), the signal intensity can be obtained directly to obtain signal strength sorting front columns. Templates corresponding to CIR. This is already more mature, and details will not be described here. The specified number of sorted forefellets can be performed as needed, for example, sorting is 1, which can be obtained by simulating the strongest CIR corresponding to the strongest CIR. CIR sorting signal strength is 1 can also be the most powerful CIR.

[0048] Direct radius is corresponding to the reflected signal corresponding to the transmission. If a signal passes through the non-viewpread propagation to the receiving antenna, it is clear that the power is less than the reflection signal corresponding to the distance transmission, which is reflected in the CIR, ie the peak value of the corresponding reflection signal is smaller than the peak of the Direction. In other words, if the direct reflection is found from the measurement CIR, the signal corresponding to the receiving antenna is found in this line.

[0049] Further, the CIR template of the measurement CIR and the signal intensity can be sorted by each other, and the channel impact response CIR of the signal intensity sorting prior column can be determined according to the cross-correlation result.

[0050] The cross-correlation refers to the two functions of the two functions, respectively, and the infinite integral of the multiplication, which reflects the CIR template of the measurement CIR and the signal intensity order from the result of the multiplication. Sexual measure. In particular, for the CIR template of the measurement CIR and the signal strength sorted prior column, its cross-correlation operation corresponds to the curve of the two functions relatively straight to the overlapping portion formed and the area of ​​the horizontal axis. The size of this translational parameter is to be adjusted according to the needs, and in practice, the number of variations of the two can be translated into one direction (e.g., right), and the like may be performed.

[0051] So in such a way, since the CIR template in the preceding line of signal strength sorted itself reflects the theoretical situation of the straight radius. At this time, if the CIR and signal strength sorting prior to measurement of the CIR and signal strength can be similarly similar (embodied in the mutual relationship, whether it is to left or On the right flush one unit's parameter, it will reduce the similarity), then the channel impact response CIR of the measurement CIR in this time has been quite close is quite close.

[0052] Specifically, since the peak value is included in the image of the CIR (including the measurement CIR and signal intensity sorting the forego) (a peak corresponding to one signal), the width of the peak value can be determined. For example, a portion of the peak 3/4 in the peak neighborhood is considered to be the width of the peak. If the peak of a peak is 4, the height of the peak adjacent to 3 is a wide range of peaks.

[0053] In measurement CIR, since there may be a peak is superimposed in multiple signals (eg, the distance propagation signal and the non-viewpread propagation signal), then it is clear that if there is a case where the interference signal of the non-viewpoint propagation is, the CIR is related to each other. The width of the peak will be large. At this time, it can be considered that the measurement CIR consists of the reflected signals on the plurality of paths, and the signal of the distance propagation is also there, and the signals of other paths are relatively close to stripping, then At this time, it is necessary to retain the measurement CIR for positioning, i.e., directly determined that the measurement CIR is a direct radius CIR. That is, the second width of the peak value in the peak value of the peak value and the sum of the signal strength sorted, respectively; if the ratio of the first width and the second width exceeds the preset value (for example, related The width of the peak is 1.5 times larger than the peak of the template CIR), and the measurement CIR is determined as the channel impact response CIR of the signal intensity.

[0054] If the ratio of the first width and the second width does not exceed the preset value (eg, no more than 1.5 times), then first, it can be confirmed that there may be a possible direct diameter CIR (ie, the CIR to be determined), then At this time, it is possible to obtain a CIR according to the cross-correlation result and the template CIR, and the measurement CIR and the pending CIR are still a function and an image similar to the CIR, there is also some peaks, if The pendant CIR is the actual direct radius CIR, then pass through the difference, in fact, the remaining difference should not contain a direct radius CIR, and only a number of paths of the path propagating. Even if there is still peak in the poor, its peak should be smaller, so it can be set by setting if the ratio of the peak of the measurement CIR does not exceed the predetermined ratio (for example, 0.6 times), that is, the peak value is relatively small, then That is, it can be considered that the pending CIR to be subjected is actually a true direct radius CIR, so that the pending CIR is determined to be a channel impact response CIR of the signal strength sorted prior column.

[0055] Further, if the peak value of the difference is more than the predetermined ratio of the ratio of the peak value of the measurement CIR, the transmitter diameter CIR can be considered to be in the difference, and the difference can be determined as a new measurement CIR, cross-correction The new measurement CIR and the signal strength sorted CIR template, and determines the channel impact response CIR of the signal intensity sorting in accordance with the cross-correlation result. Specifically, the determined manner is the same as that of the foregoing, that is, the difference can be overlapped until the actual Direct Number CIR is found.

[0056] Of course, in practical applications, other modes can be employed to determine the channel impact response CIR of the straight range signal strength sorting in the first column of the straight range signal strength, and this scheme is not specified.

[0057] S307, converts the channel shock of the signal intensity sorted preceding column in response to the channel state information CSI of the corresponding Direct diameter, the reach of the detection signal of the N frequency point including the detection signal of the N frequency point in the channel state information CSI, the channel state information CSI, including the detection signal of the N frequency point. Phase.

[0058] Specifically, the frequency Fourier Transform, FFT can be used to convert the signal intensity sorted channel impact response CIR to channel state information CSI, thereby obtaining a channel state information of Direct diameter CSI, at this time The CSI is a CSI corresponding to the signal at the time of transmission, including the reaching phase and amplitude of the reflected signal corresponding to the detection signal of the n frequency point, and the like.

[0059] S309, according to the point of the N intendment phase and the point to the point to the position of the positioning device, the power of each point in the power holographic imaging is sorted from large to small, and the power is sorted. The preceding point is determined as the location of the RFID tag.

[0060] After obtaining the phase phase, it can be imaged based on each point in the space to reach the phase. Specifically, a point (x, y) to the positioning device is D. 0 , Then you can reach the phase, distance D 0 To calculate the phase of the signal at point (x, y) at point (x, y), in turn, it can be known that the power of the frequency point at the point (x, y), puts all the frequency points at this point of this point. Add, that is, the image of this point. Obviously, in the image, the point at which the RFID tag should be strong, in turn, the power of each point is from large to small, and the coordinates of the power sorted in the forefront are the location of the RFID tag. For example, determine the power of power as the position where the RFID tag is located.

[0061] That is, the point in the space can be traveled, and the distance to the point to the positioning device is determined for any point on the space; determined according to the distance and the arrival phase to determine the MA sky, respectively, corresponding to the The sum of the power of the N frequency points, and the sum of the power is determined as the imaging power corresponding to the point. Specifically, the following formula can be used to generate power holographic imaging:

[0062] Among them, P is the abscissa and ordinate of the power, X and Y are in the space, and J is a plurality of imaginary symbols, λ is wavelength, π is a circumferential rate, D n,m Distance to the mth receiving antenna to point (x, y), D tx To transmit antenna to point (x, y) distance, ф n，m The arrival phase of the reflected signal corresponding to the detection signal of the nthik area for the mth antenna.

[0063] According to an embodiment of the present invention, an overlapping signal of a probe signal containing a plurality of frequencies is transmitted, and the superimposed signal is received after the modulation of the RFID tag, and the receiving antenna is received, by determining the channel state of the reflected signal. Information CSI, and converted into a corresponding measurement channel impact response CIR, and determined the CIR template of the preceded column of signal intensity under the specified frequency band, the CIR template of the measurement CIR and the signal strength can be correlated, and from each other The result is determined to determine the direction of direct radius CIR included in the measurement CIR, and finally convert the reaching phase of each frequency point signal by reverse transmission of the direct number CIR, thereby constructing a power holographic imaging based on different frequency points of these different antennas. The point in holographic imaging is determined to be the position of the RFID tag, eliminating the interference component in the received signal, implements a precise label positioning.

[0064]In one embodiment, the method further comprises: for any of the N-frequency points prior to determining the channel state information CSI of the N frequency point, determined to be The consistency index of the phase of the continuous plurality of reflected signals under the frequency point, if the consistency indicator does not exceed the predetermined value, the reflection signal under this frequency is not used, and the consistency indicator characterizes the frequency point. The degree of stability of the reflected signal. Specific consistency indicators can be determined based on need to be self-contained. For example, for a continuous N reflected signal under a frequency, set the phase consistency index as Where θ n The phase of the nth reflection signal. By setting the phase consistency index, the phase fluctuation of the signal when the signal is worse, and the subsequent positioning accuracy can be further improved.

[0065] In one embodiment, phase calibration and power calibration can also be performed during positioning. Specifically, the arrival phase calibration matrix can be based on the preset phase calibration matrix before the power holographic imaging on the distance to the position of the positioning device is constructed according to the distance to the position of the positioning device. The preset phase calibration matrix performs phase calibration. The phase calibration matrix is ​​in the form of: in For the midth antenna, the phase calibration value of the Nth frequency point, that is, the elements in the calibration matrix and "antenna + frequency point" one by one. The specific value can be given by the actual test, or it can be obtained based on experience. There is also the same correspondence in the power calibration matrix.

[0066] For example, a method based on the actual test gives the phase calibration matrix: fixed a RFID tag in the front square air of the antenna in the antenna array, keeps the label and the antenna center at the same horizontal plane, and the linear distance of the measurement space is D; The transmit frequency is pressed in turn F 0 , F 1 , ..., f N Switch, obtain the phase θ of the corresponding received signal 10 , Θ 11 , ..., θ 1N , Subtracting phase changes caused by distance transmission The phase obtained is Replace the antenna 1 link to replace the antenna 1 link, repeat the above steps to obtain the phase calibration value The above operations are sequentially performed in turn, and finally the phase calibration matrix of the system is obtained. The calibration matrix represents the phase offset of the hardware link to different frequency points and different antennas, which can eliminate the effect to eliminate the corresponding phase calibration value in the actual measured reach phase to achieve more accurate positioning.

[0067] The mode in which the power calibration is similar to the above-mentioned phase calibration, the preset power calibration matrix is: Where P mn For the power calibration value of the Mth antenna for the nth frequency point, the calibration matrix contains hardware link attenuation and free space propagation at each of the antenna of each frequency point. In actual measured power values, different frequency points in each antenna decay, free space propagation attenuation, the same change. Therefore, after the measured power matrix subtracts the calibration matrix, it can eliminate the power influence of the signal multipath effect, and achieve more accurate positioning. In the entire system, the flow of signal processing is like Figure 3B Distance Figure 3B The processing flow of signals in one system provided in the present application embodiment.

[0068] In one embodiment, a plurality of antenna arrays may also be provided so that each antenna array generates a power holographic imaging, ie, a plurality of power holographic imaging corresponds to one by one by one by one by one by one by one by one by one, and can be superimposed. Power holographic imaging, generate a superimposed power holographic image. Specifically, it is assumed that there is a k air array, and the imaging value of the plurality of power holographic imaging can be superimposed, and the absolute value of the power of the holographic imaging as an imaging value as the imaging value), and the plurality of power holographic imaging The inverse ratio of the middle value is less than zero as the value of the updated power holographic imaging, the value of the updated plurality of power holographic imaging, and generates a superposition of power holographic image, that is, p k That is, the hologram imaging in the space in the space, P is the superimposed power holographic imaging.

[0069] Alternatively, the numerical value of the plurality of power holographic imaging may be superimposed, and the positive and negative of the superimposed result may be judged, and when the superimposed result is negative, the opposite is taken as a superimposed power holographic image. The plurality of power holographic imaging is added to take an absolute value, ie Alternatively, the generated plurality of power holographic imaging can be performed, which can be determined according to the situation of the actual experience, using multiple antenna arrays to perform comprehensive imaging and positioning, can reduce a single image positioning Error fluctuations make the positioning more stable.

[0070] Corresponding, the embodiment of the present invention also provides an RFID-based positioning device, including a transmission antenna and a positioning device of at least one receiving antenna array, such as Figure 4 Distance Figure 4 A structural diagram of an RFID-based positioning device provided in the embodiment of the present invention, including:

[0071] The transmitting antenna 401 transmits a superimposed signal, wherein the superimposed signal contains a detection signal of N frequency points within the specified frequency band;

[0072] The receiving antenna 403 receives the RFID tag to the reflected signal of the laminated signal, determine the channel state information CSI of the reflected signal on the N frequency point;

[0073] Direct Arcks Determination Module 407, obtains the channel impact response CIR of the inner column in the first column of the direct-radius signal intensity in the specified frequency section according to the channel state information CSI;

[0074] The phase determination module 409 converts the channel impact of the signal intensity sorted front column in response to the channel state information CSI corresponding to the corresponding straight radiator, and the channel state information CSI contains the detection signal of the N frequency point. Reflection corresponding to the reflection The arrival phase of the signal;

[0075] The positioning module 411, according to the reachable phase of the n frequency point to the point to construct the power holographic image on the distance of the positioning device, the power in the power holographic image from the power holographic imaging, will be sorted from large Points of power sorting prior column are determined as the location of the RFID tag.

[0076] Further, the apparatus also includes a consistency verification module 413, which determines the consistency index of the phase of continuous plurality of reflected signals under this frequency point for any of the frequency points of the N frequency point. If the indicator does not exceed the preset value, the reflected signal under this frequency is not used.

[0077] Further, the direction of direct transmission module 407 converts the channel state information CSI to a measurement channel impact response CIR, determines the CIR template of the signal strength sorted by the signal intensity according to the channel status information CSI and the specified frequency band; the measurement of each other CIR and the signal strength sorted CIR template, and determine the channel impact response CIR of the signal intensity sorting in accordance with the cross-correlation result;

[0078] Further, the designated frequency band includes: (800 MHz, 870 MHz), (885 MHz, 935 MHz) and (960 MHz, 1000 MHz).

[0079] Further, the straight range determining module 407 determines a second width of the first width of the peak value and the first width of the peak in the CIR template of the signal intensity, respectively; if the first width and the second width are The ratio exceeds the preset value, then the measurement CIR is determined as the channel impact response CIR of the signal strength sorting front column; if the ratio of the first width and the second width does not exceed the preset value, according to the mutual The associated result and the signal strength sorted CIR template determines that the CIR is determined to determine the difference in the measurement CIR and the peak CIR. If the ratio of the peak value of the peak value does not exceed the predetermined ratio, Then, the pending CIR is determined as the channel impact response CIR of the signal strength sorted prior column.

[0080] Further, the straight range determining module 407, if the ratio of the peak value of the difference is exceeded the predetermined ratio, the difference is determined as a new measurement CIR, and the new measurement CIR is related to each other. The signal strength is sorted, and the channel impact response CIR of the signal intensity sorting prior column is determined according to the result of the cross-correlation result.

[0081] Further, the positioning module 411, the point in the space, determines the distance to the positioning device for any point in the space, and determines the distance of the positioning device according to the distance and the arrival phase. The sum of the power of the N frequency point corresponding to the antenna, and the power is determined to be the imaging power corresponding to the point.

[0082] Further, the positioning module 411, the power holographic imaging on the distance to the point to the point to the positioning device in accordance with the point to the positioning device, including: generating power holographic imaging using the following formula:

[0083] Among them, P is the abscissa and ordinate of the power, X and Y are in the space, and J is a plurality of imaginary symbols, λ is wavelength, π is a circumferential rate, D n,m Distance to the mth receiving antenna to point (x, y), D tx To transmit antenna to point (x, y) distance, ф n，m The arrival phase of the reflected signal corresponding to the detection signal of the nthik area for the mth antenna.

[0084] Further, the apparatus further includes a phase calibration module 415 for reaching the power holographic imaging on the distance to the position of the positioning device according to the point to the point of the positioning device. The phase calibration is performed according to the preset phase calibration matrix, and the preset phase calibration matrix is: in The arrival phase calibration value of each of the two frequencies of the mid-m respective antenna.

[0085] Further, in the apparatus, D is a preset test distance, θ mn In order to test the mth receiving antenna in the test distance D For the frequency f n The phase obtained by the detection signal, π is the circumference rate, C is the radius, For the mth receiving antenna for frequency f n The phase calibration value of the detection signal.

[0086] Further, the apparatus also includes a power calibration module 417 for sorting the power of each point in the power holographic imaging, the point of the power sorted prior to the precedent column is determined as the position of the RFID tag, the space points. The power is power calibrated based on the preset power calibration matrix, the preset power calibration matrix: Where P mn The power calibration value for the nth node of the mth antenna.

[0087] Further, the positioning module 411, when there is a plurality of antenna arrays, determine a plurality of power holographic imaging corresponding to the plurality of antenna array; superimposing the plurality of power holographic imaging, generating a superimposed power hologram image.

[0088] Further, the positioning module 411 superimpoes the numerical value of the plurality of power holographic imaging, and judges the positive and negative of the superimposed result, and takes the opposite of the superimposed power hologram image when the superimposed result is negative; or The correction of the numerical value of the plurality of power holographic imaging is less than zero as the value of the updated power holographic imaging, the value of the updated plurality of power holographic imaging, and generates a superimposed power holographic image.

[0089] The positioning method of this embodiment can be performed by an electronic device having a data processing power, including, but not limited to, a server, a mobile terminal (such as mobile phone, PAD, etc.) and PCs.

[0090] The positioning device of the present embodiment is used to implement the corresponding positioning method in the plurality of method embodiments, and has the advantageous effects of the corresponding method embodiment, and will not be described herein. Further, the functional implementation of the respective modules in the positioning of the present embodiment can be referred to the description of the corresponding portion in the foregoing method embodiment, and will not be described herein.

[0091] Refer Figure 5 The structural schematic diagram of an electronic device according to Embodiment 5 of the present invention is shown, and the specific embodiments of the present invention do not limit the specific implementation of electronic devices.

[0092] like Figure 5 As shown, the electronic device may include a processor 502, a communication interface 504, a memory 506, a communication bus 508, a transmitter 503, a receiver 505, and a display 507.

[0093] The processor, the transmitter, the receiver, the display, the memory, and the communication interface through the communication bus to complete communication between each other;

[0094] The transmitter 503 is configured to transmit superposition signals, wherein the superimposed signal contains a detection signal of N frequency points in the specified frequency band, and n is an integer greater than 1;

[0095] The receiver 505 is configured to receive the RFID tag to display the reflected signal of the laminated signal, and display the reflection information by the display, and transmitting the reflection information to the processor;

[0096] The processor 502 is configured to determine the channel state information CSI of the reflected signal on the N frequency point; obtain the channel impact response CIR of signal strength sorting in the specified frequency section according to the channel status information CSI; Converting the channel impact of the signal intensity sorted preceding column in response to the channel status information CSI of the corresponding Direct diameter, the reach of the reflected signal corresponding to the detection signal of the N frequency point; According to the distance to the point of the n frequency point to the point to the distance to the position of the positioning device, the power of each point in the power holographic imaging is sorted from large to small, and the power is sorted in front. Click to determine the location of the RFID tag;

[0097] The display 507 is further configured to acquire the power holographic imaging and the location of the RFID tag from the processor, and exhibit the position of the power holographic imaging and the RFID tag;

[0098] The memory 506 is configured to store the reflected signal, the CSI, the CIR, the power holographic image, and the RFID tag.

[0099] Processor 502, for executing program 510, specifically, the relevant steps in the above positioning method embodiment are specifically executed.

[0100] Specifically, program 510 can include program code, which includes computer operation instructions.

[0101] Processor 502 may be a central processor CPU, or a particular integrated circuit ASIC (ApplicationSpecific Integrated Circuit, or is configured to implement one or more integrated circuits of the embodiment of the present invention. One or more processors included in the smart device can be the same type of processor, such as one or more CPUs, or different types of processors, such as one or more CPUs, and one or more ASICs.

[0102] Memory 506 is used to store program 510. Memory 506 may include a high speed RAM memory, and may also include non-Volatile memory, such as at least one disk memory.

[0103] In an alternative embodiment, the program 510 is further configured to make a specific implementation of the processor 502 in the program 510 to see the corresponding steps and the corresponding description in the above method embodiment, and will not be described herein. Those skilled in the art can clearly understand that the specific operation of the device and module described above can be referred to in the foregoing method embodiment described above, and details are not described herein.

[0104] Through the electronic device of the present embodiment, the superimposed signal containing a plurality of frequencies, the superimposed signal is received after the modulation reflection of the RFID tag, and the receiving antenna is received, by determining the channel state information of the reflected signal CSI, and converted A corresponding measurement channel impact response CIR, and determining the CIR template of the signal strength sorted in the specified frequency band, the CIR template of the measurement CIR and the signal intensity can be corrected, and it is determined from the cross-correlation result. Measure the direct radius CIR included in the CIR, and finally converted to the reach of each frequency point signal with a direct number CIR, thereby constructing a power holographic imaging based on different frequency points of these different antennas, power holographic imaging amplitude The larger point is determined as the position of the RFID tag, eliminates the interference component in the received signal to realize the precise tag positioning.

[0105] It should be noted that the respective components / steps described in the embodiments of the present invention can be split into more components / steps according to the requirements of the implementation, or some of the two or more components / steps or components / steps can also be combined into The new component / step is to achieve the object of the embodiment of the present invention.

[0106] The method according to an embodiment of the present invention can be implemented in hardware, firmware, or is implemented in software or computer code that can be stored in a recording medium, such as a CD ROM, a RAM, a floppy disk, a hard disk, or magnetic disc, or is implemented. The original storage of the network download is stored in the remote recording medium or the non-transitory machine readable medium and will be stored in the local recording medium, so that the methods described here can be stored in using a general purpose computer, a dedicated processor or programmable. Or such software processing on a record medium (such as an ASIC or FPGA). It will be appreciated that the computer, processor, microprocessor controller or programmable hardware includes storage components (eg, RAM, ROM, flash memory, etc.) that can store or receive software or computer code, when the software or computer code is computed, The positioning method described here is implemented when the processor or hardware is accessed and executed. Further, when a general purpose computer accesses the code for implementing the positioning method shown here, the execution of the code converts the general-purpose computer into a dedicated computer for performing the positioning method shown here.

[0107] One of ordinary skill in the art will appreciate that the unit and method steps of the various examples described herein can be accomplished by electronic hardware, or computer software and electronic hardware. These functions are executed in hardware or software, depending on the specific application and design constraint conditions of the technical solution. Professional technicians can use different methods to implement the described functions for each particular application, but this implementation should not be considered exceeding the scope of the embodiments of the invention.

[0108] The above embodiment is intended to illustrate the embodiments of the present invention, and is not limited to the embodiments of the present invention, and various articles in the art will also make various kinds without departing from the spirit and scope of the embodiments of the invention. Variations and variations, so all equivalent technical solutions also belong to the scope of the embodiments of the present invention, and the scope of patent protection according to the embodiment of the present invention should be limited by the claims.