CN117474026B - RFID handheld device data intelligent processing method - Google Patents
RFID handheld device data intelligent processing method Download PDFInfo
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Abstract
The invention relates to the field of RFID (radio frequency identification) equipment data processing, in particular to an RFID handheld equipment data intelligent processing method. Firstly, acquiring a tag response signal of each electronic tag, and acquiring an ideal signal reading rate of each tag response signal according to the distance between RFID handheld equipment and the electronic tag; segmenting the tag response signal to obtain a plurality of local signal segments and local frequencies and local amplitudes of each local signal segment, and analyzing the distribution characteristics of the local frequencies and the local amplitudes of all local signal segments in the tag response signal to obtain the signal aliasing degree of the tag response signal; obtaining a real signal reading rate of a response signal to the tag according to the signal aliasing degree and the ideal signal reading rate; each tag response signal is processed based on the true signal read rate. The method and the device can improve the calculation accuracy of the reading rate of the tag response signals and process the RFID handheld device data more effectively.
Description
Technical Field
The invention relates to the field of RFID (radio frequency identification) equipment data processing, in particular to an RFID handheld equipment data intelligent processing method.
Background
The RFID handheld device is based on radio frequency identification (Radio Frequency Identification, RFID) technology, and is widely applied to the fields of logistics, warehousing and the like by receiving response signals returned by electronic tags, and in the process of identifying the objects by using the RFID handheld device, the received response signals are affected by external factors, so that error of tag data after decoding the response signals is caused, and further processing of the RFID handheld device data is needed to prevent the decoding of the error tag data.
In the related art, the signal reading rate is generally calculated according to the distance between the RFID handheld device and the electronic tag, and the received response signal is subjected to cleaning processing based on the signal reading rate, but when an obstacle exists between the RFID handheld device and the electronic tag, the received response signal is overlapped, so that the calculation accuracy of the signal reading rate obtained by the existing method is lower, and the effect and accuracy of data processing of the RFID handheld device are reduced.
Disclosure of Invention
In order to solve the technical problem that the signal reading rate obtained by the existing method is low in calculation accuracy, so that the effect of data processing on the RFID handheld device is reduced, the invention aims to provide an intelligent data processing method for the RFID handheld device, which adopts the following technical scheme:
the invention provides an intelligent processing method for RFID handheld equipment data, which comprises the following steps:
acquiring a tag response signal of each RFID electronic tag, and acquiring an ideal signal reading rate of the RFID handheld device on each tag response signal according to the distance between the RFID handheld device and each RFID electronic tag;
segmenting each tag response signal to obtain different local signal segments and local frequencies and local amplitudes of each local signal segment; obtaining the frequency superposition degree of each tag response signal according to the distribution of the local frequencies of all the local signal segments in each tag response signal; obtaining the amplitude variation degree of each tag response signal according to the distribution of the local amplitude of all the local signal segments in each tag response signal and the local frequency; obtaining a signal aliasing degree of each tag response signal based on the frequency superposition degree and the amplitude variation degree;
according to the signal aliasing degree, the ideal signal reading rate is adjusted, and the real signal reading rate of the RFID handheld device for each tag response signal is obtained;
each tag response signal is processed based on the true signal read rate.
Further, the segmenting each tag response signal to obtain different local signal segments and local frequencies and local amplitudes of each local signal segment includes:
establishing a time domain diagram of each tag response signal;
taking the intersection point of the horizontal axis of the time domain diagram and the tag response signal as a dividing point, and dividing the tag response signal to obtain different local signal segments;
taking the two times of the difference between the ending time and the starting time of each local signal segment as the local period of the corresponding local signal segment, and taking the reciprocal of the local period as the local frequency of the corresponding local signal segment;
the maximum value of the amplitude of each local signal segment is taken as the local amplitude of the corresponding local signal segment.
Further, the obtaining the frequency superposition degree of each tag response signal according to the distribution of the local frequencies of all the local signal segments in each tag response signal includes:
taking the average value of the local frequencies of all the local signal segments in each tag response signal as the overall frequency of the tag response signal;
obtaining the frequency difference degree of each tag response signal according to the difference between the overall frequency and the preset standard frequency;
and normalizing the product value of the standard deviation of the local frequencies of all the local signal segments and the frequency difference degree in each tag response signal to obtain the frequency superposition degree of each tag response signal.
Further, the obtaining the frequency difference degree of each tag response signal according to the difference between the overall frequency and the preset standard frequency includes:
taking the absolute value of the difference between the integral frequency and the preset standard frequency as a numerator, taking the preset standard frequency as a denominator, and taking the ratio as the frequency difference degree of each tag response signal.
Further, the obtaining the amplitude variation degree of each tag response signal according to the local amplitude distribution of all the local signal segments in each tag response signal and the local frequency includes:
the calculation formula of the amplitude variation degree of each tag response signal is as follows:
wherein,indicate->The degree of amplitude variation of the individual tag response signals; />Indicate->An average of the local amplitudes of all local signal segments of the individual tag response signals; />Representing a preset standard amplitude; />Indicate->The number of local signal segments of the individual tag response signals; />Indicate->The +.>Local frequencies of the individual local signal segments; />Indicate->An average of the local frequencies of all local signal segments of the individual tag response signals; />Indicate->The +.>Local amplitudes of the individual local signal segments; />Expressed as natural constant->A logarithmic function of the base; />Representing a hyperbolic tangent function.
Further, the obtaining the signal aliasing degree of each tag response signal based on the frequency superposition degree and the amplitude variation degree includes:
and taking the product value of the frequency superposition degree and the amplitude variation degree as the signal aliasing degree of each tag response signal.
Further, the adjusting the ideal signal reading rate according to the signal aliasing degree, and obtaining the real signal reading rate of the RFID handheld device for each tag response signal includes:
carrying out negative correlation normalization on the signal aliasing degree to obtain an adjustment parameter of each tag response signal;
and taking the product value of the adjustment parameter and the ideal signal reading rate as the actual signal reading rate of the response signal of the RFID handheld device to each tag.
Further, the processing each tag response signal based on the true signal read rate includes:
and screening out the tag response signals with the real signal reading rate smaller than a preset reading rate threshold.
Further, the obtaining the ideal signal reading rate of the response signal of the RFID handheld device to each tag according to the distance between the RFID handheld device and each RFID electronic tag comprises:
and carrying out inversely related normalization on the ratio of the distance to the preset standard readable distance of the RFID handheld device to obtain the ideal signal reading rate of the RFID handheld device on each tag response signal.
Further, the preset read rate threshold is set to 0.8.
The invention has the following beneficial effects:
according to the invention, the fact that the calculated accuracy of the signal reading rate is lower due to the fact that the obstacle between the RFID handheld device and the electronic tag is considered, so that the processing effect of tag data after the tag response signal is decoded is reduced; the method and the device can obtain the real signal reading rate with higher precision based on the ideal signal reading rate, and consider that the existence of the obstacle can cause the aliasing of the tag response signal so as to change the frequency and the amplitude of the received tag response signal, so that the method and the device segment the tag response signal, analyze the distribution of the local frequency and the distribution of the local amplitude of the local signal segment, reflect the frequency change condition of the tag response signal through the frequency superposition degree, reflect the amplitude change condition of the tag response signal through the amplitude change degree, further regulate the ideal signal reading rate through the acquired signal aliasing degree, and acquire the real signal reading rate with higher precision, thereby carrying out more effective and accurate processing on the tag response signal based on the real signal reading rate in the follow-up.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions and advantages of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an intelligent processing method for data of an RFID handheld device according to an embodiment of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following is a detailed description of specific implementation, structure, characteristics and effects of an RFID handheld device data intelligent processing method according to the invention with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" means that the embodiments are not necessarily the same. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The following specifically describes a specific scheme of the data intelligent processing method of the RFID handheld device provided by the invention with reference to the accompanying drawings.
Referring to fig. 1, a flowchart of a method for intelligently processing data of an RFID handheld device according to an embodiment of the present invention is shown, where the method includes:
step S1: and acquiring a tag response signal of each RFID electronic tag, and acquiring an ideal signal reading rate of the RFID handheld device on each tag response signal according to the distance between the RFID handheld device and each RFID electronic tag.
The RFID handheld device is based on a radio frequency identification technology, objects are identified by receiving response signals returned by the electronic tag, the received response signals are influenced by external factors in the process of identifying the objects by using the RFID handheld device, so that tag data acquired after decoding the response signals are wrong, the received response signals are usually screened out through a signal reading rate by the conventional method, erroneous electronic tag data are prevented from being decoded out by the response signals with serious loss, however, when obstacles exist between the RFID handheld device and the electronic tag, superposition phenomenon occurs to the received response signals, the calculation accuracy of the signal reading rate acquired through the conventional method is low, and the effect and accuracy of data processing of the RFID handheld device are reduced. The invention provides an intelligent processing method for RFID handheld device data to solve the problem.
The principle of the radio frequency identification technology is that radio frequency signals are sent to an electronic tag through an RFID handheld device, the electronic tag encodes tag data after receiving the radio frequency signals and returns response signals to the RFID handheld device in an electromagnetic wave mode, the RFID handheld device decodes the response signals to obtain the tag data after receiving the response signals, but in the process, the response signals are influenced by external factors such as barriers, signal superposition phenomenon occurs, the response signals are abnormal, and error of the decoded tag data is caused, so that further processing is needed to be carried out on the response signals, and error of the tag data obtained after decoding the response signals is prevented.
According to the embodiment of the invention, the RFID handheld device is used for acquiring the tag response signal returned by each electronic tag, the distance between the RFID handheld device and each electronic tag is acquired through the distance sensing module in the RFID handheld device, and under the ideal condition of no obstacle, the main influencing factor of the RFID handheld device on the reading rate of the tag response signal returned by the electronic tag is the distance between the RFID handheld device and each electronic tag, so that the ideal signal reading rate of the RFID handheld device on each tag response signal is initially acquired according to the distance between the RFID handheld device and each RFID electronic tag, and in the follow-up, the adjustment can be performed on the basis of the ideal signal reading rate, so that the accuracy is further improved, and the data processing effect of the RFID handheld device is improved.
Preferably, in one embodiment of the present invention, the method for acquiring the ideal signal reading rate of the RFID handheld device for each tag response signal specifically includes:
the ratio of the distance between the RFID handheld device and each RFID electronic tag to the preset standard readable distance is normalized in a negative correlation manner, so that the ideal signal reading rate of the RFID handheld device for each tag response signal is obtained, wherein the preset standard readable distance is used for prompting a user that the distance between the RFID handheld device and the electronic tag is required to be smaller than the preset standard readable distance when the RFID handheld device is used, the preset standard readable distances of the RFID handheld devices of different models are different, the preset standard readable distance is set to be 5 meters in one embodiment of the invention, and the specific value of the preset standard readable distance can be set by an implementer according to specific implementation situations and is not limited. The expression of the ideal signal reading rate may specifically be, for example:
wherein,indicating the RFID hand-held device pair->Ideal signal read rate of individual tag response signals; />Indicating RFID handheld device and +>The distance between the electronic tags; />Representing a readable distance of a preset standard; />Expressed as natural constant->An exponential function of the base.
In the process of acquiring the ideal signal reading rate of the response signal of each tag by the RFID handheld device, the distance between the RFID handheld device and each electronic tag is in the ideal condition of no obstacleThe larger the RFID handheld device, the worse the reading effect of the RFID handheld device on the tag response signal is, the ideal signal reading rate of the RFID handheld device on the tag response signal is +.>The smaller is, wherein the standard readable distance is preset +.>For limiting and standardizing->Prevent->Is too large.
After the tag response signal of each electronic tag and the ideal signal reading rate of the RFID handheld device for each tag response signal are obtained, the tag response signal can be analyzed in the follow-up process, and the ideal signal reading rate is adjusted, so that the effect of data processing of the RFID handheld device is improved.
Step S2: segmenting each tag response signal to obtain different local signal segments and local frequencies and local amplitudes of each local signal segment; obtaining the frequency superposition degree of each tag response signal according to the distribution of the local frequencies of all local signal segments in each tag response signal; obtaining the amplitude variation degree of each tag response signal according to the distribution of the local amplitudes and the local frequencies of all local signal segments in each tag response signal; the signal aliasing degree of each tag response signal is obtained based on the frequency superposition degree and the amplitude variation degree.
The obtained ideal signal reading rate is that under the ideal condition without an obstacle, the RFID handheld device is always influenced by the obstacle when receiving the tag response signal in practical application, so that the tag influence signal can generate multipath propagation effect, namely the tag response signal returned by the electronic tag can propagate along a plurality of paths in space to reach a receiver of the RFID handheld device, and different propagation delays exist on different propagation paths, so that the tag response signal received by the RFID handheld device is subjected to aliasing phenomenon, the actual reading rate of the tag response signal by the RFID handheld device is greatly different from the obtained ideal signal reading rate, and the frequency and the amplitude of the tag response signal received by the RFID handheld device are changed in consideration of the aliasing phenomenon.
Preferably, in one embodiment of the present invention, the method for acquiring the local frequency and the local amplitude of the different local signal segments and each local signal segment specifically includes:
establishing a time domain diagram of each tag response signal, wherein the abscissa of the time domain diagram represents time and the ordinate represents the amplitude of the tag response signal; taking the intersection point of the horizontal axis of the time domain diagram and the tag response signal as a dividing point, and dividing the tag response signal to obtain different local signal segments; because the splitting mode takes one peak or trough of the tag response signal as one local signal segment, the two times of the difference value between the ending time and the starting time of each local signal segment can be taken as the local period of the corresponding local signal segment, and the reciprocal of the local period is taken as the local frequency of the corresponding local signal segment; the maximum value of the amplitude of each local signal segment is taken as the local amplitude of the corresponding local signal segment.
When the aliasing phenomenon occurs in the tag response signal due to the existence of the obstacle, false frequency components are introduced into the tag response signal, so that the frequency of the tag response signal changes, the frequency of the tag response signal expected to be received by the RFID handheld device is greatly different from the frequency of the tag response signal actually received, therefore, the received change of the tag response frequency needs to be analyzed, the time spans of different local signal segments are different due to the aliasing phenomenon, namely, the difference between the ending time and the starting time of the local signal segments is caused, and the local frequency of the different local signal segments is further caused, therefore, the distribution situation of the local frequencies of all the local signal segments of each tag response signal can be analyzed, and the frequency change degree when the aliasing phenomenon occurs in the tag response signal is reflected through the obtained frequency superposition degree.
Preferably, in one embodiment of the present invention, the method for acquiring the amplitude variation degree of each tag response signal specifically includes:
taking the average value of the local frequencies of all the local signal segments as the overall frequency of the tag response signal; taking the absolute value of the difference between the integral frequency and the preset standard frequency as a numerator, taking the preset standard frequency as a denominator, taking the ratio as the frequency difference degree of each tag response signal, wherein the preset standard frequency is the frequency of the tag response signal expected to be received by the RFID handheld device, wherein the preset standard frequencies of the RFID handheld devices with different models are different, setting the preset standard frequency as 125kHz in one embodiment of the invention, and setting the specific numerical value of the preset standard frequency by an implementer according to specific implementation scenes without limitation; and normalizing the product value of the standard deviation of the local frequencies and the frequency difference degree of all the local signal segments in each tag response signal to obtain the frequency superposition degree of each tag response signal. The expression of the degree of frequency superimposition may specifically be, for example:
wherein,indicate->The degree of frequency superposition of the individual tag response signals; />Indicate->The average value of the local frequencies of all local signal segments in the individual tag response signals, i.e. +.>The overall frequency of the individual tag response signals; />Representing a preset standard frequency; />Indicate->The +.>Local frequencies of the individual local signal segments; />Indicate->The number of local signal segments in the individual tag response signals; />The hyperbolic tangent function is shown for normalization.
In the acquisition of the frequency superimposition degree of each tag response signal, the frequency superimposition degreeThe greater the frequency change after the aliasing of the tag response signal, the greater the degree of +.>Representing the degree of frequency difference of each tag response signal for reflecting the overall frequency +.>Preset standard frequency expected by RFID handheld device>Degree of difference between them, degree of frequency difference +.>The larger the difference between the frequency of the tag response signal actually received by the RFID handheld device and the frequency expected to be received is larger, and the larger the frequency change of the tag response signal is, the frequency superposition degree is larger>The greater the +.>For the standard deviation of the local frequencies of all local signal segments in each tag response signal, the larger the standard deviation is, the larger the difference of the local frequencies among the local signal segments in the tag response signal is, and the larger the frequency change of the tag response signal is, the degree of frequency superposition is illustratedThe larger the frequency is, and the product value of the frequency difference degree and the standard deviation of the local frequency is normalized by using the hyperbolic tangent function, the frequency superposition degree is +>Is limited at->And in the range, the subsequent evaluation and analysis are convenient.
When the tag response signals received by the RFID handheld device are aliased, the tag response signals through a plurality of different propagation paths are overlapped or offset in time and space, so that the overall amplitude of the tag response signals is changed, therefore, the amplitude change condition of the tag response signals can be analyzed based on the local amplitude distribution characteristics of all local signal sections of each tag response signal, and the amplitude change condition of the tag response signals is considered to be probably not caused by the existence of obstacles in the propagation process, and when the amplitude of the tag response signals is overlapped or offset due to multipath propagation effect caused by the existence of the obstacles, frequency overlapping is often generated, so that false frequency components are generated, further analysis is needed by combining the local frequencies of the local signal sections, and the amplitude change degree of the tag response signals caused by the existence of the obstacles is reflected through the acquired amplitude change degree.
Preferably, in one embodiment of the present invention, the method for acquiring the amplitude variation degree of each tag response signal specifically includes:
taking the average value of the local amplitudes of all local signal segments in each tag response signal as the integral amplitude of the corresponding tag response signal; taking the absolute value of the difference between the overall amplitude and the preset standard amplitude as an amplitude difference value, wherein the preset standard amplitude is the amplitude of a tag response signal expected to be received by the RFID handheld device, and the preset standard amplitudes of the RFID handheld devices with different models are different, in one embodiment of the invention, the preset standard frequency is set to 80, and the specific value of the preset standard frequency can also be set by an implementer according to a specific implementation scene, so that the method is not limited; in order to be able to reflect that the amplitude variation of the tag response signal is caused by the presence of an obstacle, the absolute value of the difference between the local frequency of each local signal segment in the tag response signal and the overall frequency of the tag response signal is taken into account while calculating the standard deviation of the local amplitudes of all local signal segments of each tag response signal, thereby obtaining the amplitude distribution confusion of the tag response signal, and the amplitude variation degree of each tag response signal is obtained based on the amplitude difference value and the amplitude distribution confusion. The expression of the degree of amplitude variation may specifically be, for example:
wherein,indicate->The degree of amplitude variation of the individual tag response signals; />Indicate->An average of the local amplitudes of all local signal segments of the individual tag response signals; />Representing a preset standard amplitude; />Indicate->The number of local signal segments of the individual tag response signals; />Indicate->The +.>Local frequencies of the individual local signal segments; />Indicate->The average value of the local frequencies of all local signal segments in the individual tag response signals, i.e. +.>The overall frequency of the individual tag response signals; />Indicate->The +.>Local amplitudes of the individual local signal segments; />Expressed as natural constant->A logarithmic function of the base; />The hyperbolic tangent function is shown for normalization.
In the acquisition of the amplitude variation degree of each tag response signal, the amplitude variation degreeThe greater the amplitude change after the aliasing of the tag response signal, the greater the degree of amplitude change, wherein +.>For the amplitude difference value of the tag response signal, the larger the amplitude difference value is, the larger the difference between the amplitude of the tag response signal actually received by the RFID handheld device and the amplitude expected to be received is, and further the larger the amplitude change of the tag response signal is, the amplitude change degree is shown as follows>The greater the +.>For the amplitude distribution disorder of the tag response signals, the amplitude distribution disorder is in the form of a standard deviation as a whole, and the standard deviation of the local amplitudes of all local signal segments in each tag response signal is calculated while using +.>For->Is adjusted by natural constant +.>The logarithmic function of the base is used for the pair +.>The numerical limitation is performed to prevent the numerical value from being excessively large,the greater the amplitude distribution disturbance, the greater the degree of frequency change of the tag response signal, and the greater the amplitude distribution disturbance, the more likely the amplitude change of the tag response signal is due to the presence of an obstacle, the degree of amplitude changeThe larger the amplitude is, the more the product value of the amplitude difference value and the amplitude distribution disorder degree is normalized by using the hyperbolic tangent function, the amplitude variation degree is +>Is limited at->And in the range, the subsequent evaluation and analysis are convenient.
After the frequency superposition degree and the amplitude variation degree of each tag response signal are obtained, the condition that the tag response signals are subjected to signal aliasing can be analyzed by combining the frequency superposition degree and the amplitude variation degree, so that the signal aliasing degree of each tag response signal is calculated.
Preferably, in one embodiment of the present invention, the product value of the frequency superposition degree and the amplitude variation degree is used as the signal aliasing degree of each tag response signal, in order to facilitate analysis in the subsequent stepIndicate->The individual tags respond to the signal aliasing degree of the signal.
After the signal aliasing degree of each tag response signal is obtained, the influence degree of the obstacle on each tag response signal can be estimated based on the signal aliasing degree in the follow-up, so that the ideal signal reading rate of the tag response signals can be adjusted based on the signal aliasing degree, and the calculation accuracy of the tag response signal reading rate is improved.
Step S3: and adjusting the ideal signal reading rate according to the signal aliasing degree to obtain the real signal reading rate of the RFID handheld device for each tag response signal.
Because the ideal signal reading rate is obtained by calculation under the condition of no obstacle, when the obstacle exists between the RFID handheld device and the electronic tag, the tag influence signal can generate multipath propagation effect, so that the signal aliasing phenomenon occurs, the ideal signal reading rate of the RFID handheld device on the tag response signal is greatly different from the actual reading rate, the obtained signal aliasing degree can reflect the degree of signal aliasing when the tag response signal is influenced by the obstacle, therefore, the ideal signal reading rate can be adjusted according to the signal aliasing degree, the actual signal reading rate of the RFID handheld device on each tag response signal is obtained, the calculation accuracy of the tag response signal reading rate under the condition of the obstacle is improved, and the tag response signal can be processed more effectively in the follow-up based on the actual signal reading rate.
Preferably, in one embodiment of the present invention, the method for acquiring the real signal reading rate of the response signal of each tag by the RFID handheld device specifically includes:
the greater the signal aliasing degree is, the greater the degree of the tag response signal affected by the obstacle is, so that the signal aliasing degree can be normalized in a negative correlation manner, and the adjustment parameter of each tag response signal can be obtained; and taking the product value of the adjustment parameter and the ideal signal reading rate as the actual signal reading rate of the response signal of the RFID handheld device to each tag. The expression of the true signal reading rate may specifically be, for example:
wherein,indicating the RFID hand-held device pair->The true signal read rate of the individual tag response signals; />Indicating the RFID hand-held device pair->Ideal signal read rate of individual tag response signals; />Indicate->The degree of signal aliasing of the individual tag response signals; />Expressed as natural constant->An exponential function of the base.
In the process of acquiring the true signal reading rate of the response signal of the RFID handheld device to each tagFor the reading rate of the tag response signal by the RFID handheld device in the presence of an obstacle, wherein the degree of signal aliasing +.>The larger the tag response signal is, the more the tag response signal is affected by the obstacleThe greater the degree of aliasing, and thus the greater the degree of corruption of the tag response signal, the more unreadable the tag response signal, and the greater the need to reduce the ideal signal read rate +.>Thus use is made of a natural constant +.>The underlying exponential function versus the degree of signal aliasing>Carrying out normalization processing of negative correlation by adjusting parameter +.>Ideal signal read rate for tag response signal +.>And the signal is reduced to a certain extent, so that the actual signal reading rate which is more in line with the actual signal reading rate is obtained.
After the real signal reading rate of each tag response signal is obtained, each tag response signal can be processed more effectively and accurately based on the real signal reading rate in the following steps.
Step S4: each tag response signal is processed based on the true signal read rate.
The decoding unit in the RFID handheld device needs to decode the tag response signal to obtain tag data, and for the damaged tag response signal, because the damaged tag response signal cannot be decoded into accurate tag data, meaningless decoding work is not needed for the damaged tag response signal, the real signal reading rate can reflect the damage degree of the tag response signal, the smaller the real signal reading rate is, the greater the damage degree of the tag response signal under the influence of an obstacle is, and the greater the damage degree of the tag response signal in the propagation process is, so that each tag response signal can be processed based on the real signal reading rate.
Preferably, in one embodiment of the present invention, the tag response signal with the real signal reading rate smaller than the preset reading rate threshold is considered to be damaged due to the influence of an obstacle in the propagation process, that is, the tag data carried by the tag response signal is damaged or incomplete, so that the tag response signal needs to be screened out, and meaningless decoding work is avoided on the damaged tag response signal, so that the RFID handheld device data can be processed more effectively, in one embodiment of the present invention, the preset reading rate threshold is set to 0.8, and the specific value of the preset reading rate threshold can also be set by an operator according to specific implementation scenarios, which is not limited herein.
In summary, the embodiment of the invention firstly obtains the tag response signal of each RFID electronic tag, and obtains the ideal signal reading rate of the RFID handheld device to each tag response signal according to the distance between the RFID handheld device and each RFID electronic tag; then segmenting each tag response signal to obtain different local signal segments and local frequencies and local amplitudes of each local signal segment; obtaining the frequency superposition degree of each tag response signal according to the distribution of the local frequencies of all local signal segments in each tag response signal; obtaining the amplitude variation degree of each tag response signal according to the distribution of the local amplitudes and the local frequencies of all local signal segments in each tag response signal; the signal aliasing degree of each tag response signal is obtained by combining the frequency superposition degree and the amplitude variation degree, and the ideal signal reading rate is adjusted according to the signal aliasing degree, so that the real signal reading rate of the RFID handheld device on each tag response signal is obtained; each tag response signal is processed based on the true signal read rate.
It should be noted that: the sequence of the embodiments of the present invention is only for description, and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
Claims (5)
1. An intelligent processing method for data of an RFID handheld device is characterized by comprising the following steps:
acquiring a tag response signal of each RFID electronic tag, and acquiring an ideal signal reading rate of the RFID handheld device on each tag response signal according to the distance between the RFID handheld device and each RFID electronic tag;
segmenting each tag response signal to obtain different local signal segments and local frequencies and local amplitudes of each local signal segment; obtaining the frequency superposition degree of each tag response signal according to the distribution of the local frequencies of all the local signal segments in each tag response signal; obtaining the amplitude variation degree of each tag response signal according to the distribution of the local amplitude of all the local signal segments in each tag response signal and the local frequency; obtaining a signal aliasing degree of each tag response signal based on the frequency superposition degree and the amplitude variation degree;
according to the signal aliasing degree, the ideal signal reading rate is adjusted, and the real signal reading rate of the RFID handheld device for each tag response signal is obtained;
processing each tag response signal based on the true signal read rate;
the obtaining the frequency superposition degree of each tag response signal according to the distribution of the local frequencies of all the local signal segments in each tag response signal comprises:
taking the average value of the local frequencies of all the local signal segments in each tag response signal as the overall frequency of the tag response signal;
obtaining the frequency difference degree of each tag response signal according to the difference between the overall frequency and the preset standard frequency;
normalizing the product value of the standard deviation of the local frequencies of all the local signal segments and the frequency difference degree in each tag response signal to obtain the frequency superposition degree of each tag response signal;
the step of obtaining the frequency difference degree of each tag response signal according to the difference between the overall frequency and the preset standard frequency comprises the following steps:
taking the absolute value of the difference value between the integral frequency and the preset standard frequency as a numerator, taking the preset standard frequency as a denominator, and taking the ratio as the frequency difference degree of each tag response signal;
the obtaining the amplitude variation degree of each tag response signal according to the local amplitude distribution of all the local signal segments in each tag response signal and the local frequency comprises:
the calculation formula of the amplitude variation degree of each tag response signal is as follows:
wherein,indicate->The degree of amplitude variation of the individual tag response signals; />Indicate->An average of the local amplitudes of all local signal segments of the individual tag response signals; />Representing a preset standard amplitude; />Indicate->The number of local signal segments of the individual tag response signals; />Indicate->The +.>Local frequencies of the individual local signal segments; />Indicate->An average of the local frequencies of all local signal segments of the individual tag response signals; />Indicate->The +.>Local amplitudes of the individual local signal segments; />Expressed as natural constant->A logarithmic function of the base; />Representing a hyperbolic tangent function;
the obtaining the signal aliasing degree of each tag response signal based on the frequency superposition degree and the amplitude variation degree includes:
taking the product value of the frequency superposition degree and the amplitude variation degree as the signal aliasing degree of each tag response signal;
the step of adjusting the ideal signal reading rate according to the signal aliasing degree to obtain the real signal reading rate of the RFID handheld device for each tag response signal comprises the following steps:
carrying out negative correlation normalization on the signal aliasing degree to obtain an adjustment parameter of each tag response signal;
and taking the product value of the adjustment parameter and the ideal signal reading rate as the actual signal reading rate of the response signal of the RFID handheld device to each tag.
2. The method for intelligently processing data of an RFID handheld device according to claim 1, wherein the segmenting each tag response signal to obtain different local signal segments and local frequencies and local amplitudes of each local signal segment comprises:
establishing a time domain diagram of each tag response signal;
taking the intersection point of the horizontal axis of the time domain diagram and the tag response signal as a dividing point, and dividing the tag response signal to obtain different local signal segments;
taking the two times of the difference between the ending time and the starting time of each local signal segment as the local period of the corresponding local signal segment, and taking the reciprocal of the local period as the local frequency of the corresponding local signal segment;
the maximum value of the amplitude of each local signal segment is taken as the local amplitude of the corresponding local signal segment.
3. The method for intelligently processing data of an RFID handheld device according to claim 1, wherein said processing each tag response signal based on said true signal reading rate comprises:
and screening out the tag response signals with the real signal reading rate smaller than a preset reading rate threshold.
4. The method for intelligently processing data of an RFID handheld device according to claim 1, wherein the obtaining an ideal signal reading rate of the response signal of the RFID handheld device to each tag according to the distance between the RFID handheld device and each RFID electronic tag comprises:
and carrying out inversely related normalization on the ratio of the distance to the preset standard readable distance of the RFID handheld device to obtain the ideal signal reading rate of the RFID handheld device on each tag response signal.
5. The method for intelligently processing data of an RFID handheld device according to claim 3, wherein the preset reading rate threshold is set to 0.8.
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