CN116432670A - Energy-saving RFID method and system capable of self-adjusting power - Google Patents
Energy-saving RFID method and system capable of self-adjusting power Download PDFInfo
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- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- G06K7/10198—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves setting parameters for the interrogator, e.g. programming parameters and operating modes
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Abstract
The invention discloses an energy-saving RFID method and system for self-regulating power, wherein the method comprises the following steps: acquiring electronic tag information; comparing and analyzing the electronic tag with electronic tags in a preset electronic tag library, and judging whether the same electronic tag exists or not, if yes, setting the distance value from the same electronic tag to the RFID reader as the distance value from the corresponding electronic tag to the RFID reader; if not, acquiring the direction of the electronic tag based on a preset camera device, and acquiring a measurement distance value of the electronic tag to the RFID reader based on a preset distance measuring device according to the direction of the electronic tag; obtaining transmitting power according to the distance value from the electronic tag to the RFID reader; and sending a reading instruction to the electronic tag according to the direction of the electronic tag and the transmitting power of the corresponding RFID reader. The invention saves the transmitting power of the RFID system and reduces the electromagnetic radiation to the environment.
Description
Technical Field
The application relates to the technical field of data processing and radio frequency identification, in particular to an energy-saving RFID method and system capable of automatically adjusting power.
Background
The maximum distance of the electronic tag which can be read by the radio frequency identification (Radio Frequency Identification, RFID) system is in a linear relation with the transmitting power of the RFID system, and the greater the power, the farther the distance of the tag which can be read. In the case that the specific position of the electronic tag is unknown, if the electronic tag is read with maximum power in order to pursue fast reading, a great amount of energy loss is caused, and electromagnetic radiation is also acted on the environment.
Accordingly, there is a need for improvement in the art.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an energy-saving RFID method and system capable of automatically adjusting power, which can more effectively save the transmission power of an RFID system.
The first aspect of the invention provides an energy-efficient RFID method of self-regulating power, comprising:
acquiring electronic tag information;
comparing and analyzing the electronic tag with electronic tags in a preset electronic tag library, and judging whether the same electronic tag exists or not, if yes, setting the distance value from the same electronic tag to the RFID reader as the distance value from the corresponding electronic tag to the RFID reader;
if not, acquiring the direction of the electronic tag based on a preset camera device, and acquiring a measurement distance value of the electronic tag to the RFID reader based on a preset distance measuring device according to the direction of the electronic tag;
Obtaining the transmitting power of the corresponding RFID reader according to the distance value from the electronic tag to the RFID reader;
and sending a reading instruction to the electronic tag according to the direction of the electronic tag and the transmitting power of the corresponding RFID reader.
In this scheme, still include:
acquiring a historical measurement distance value and a historical real distance value of a preset distance measuring device;
performing difference value calculation on the historical measured distance value and the historical real distance value of the preset distance measuring device to obtain a measured error value corresponding to the preset distance measuring device;
judging whether the measurement error value of the preset distance measuring device is larger than a preset first error threshold value, if so, deleting the measurement error value of the preset distance measuring device; if not, the measurement error value of the distance measuring device is sent to a preset measurement error value set for storage.
In this scheme, still include:
acquiring the number of measurement error values of a preset distance measuring device larger than a preset first error threshold value;
acquiring the total number of measurement error values of a preset distance measuring device;
obtaining the occurrence probability of the measurement error value larger than the preset first error threshold according to the number of the measurement error values of the preset distance measuring device larger than the preset first error threshold and the total number of the measurement error values of the preset distance measuring device;
Judging whether the occurrence probability of the measurement error value larger than a preset first error threshold is larger than a preset first probability threshold, if so, triggering error prompt information of a preset distance measuring device;
and sending the error information of the preset distance measuring device to a preset management terminal for prompting.
In this scheme, still include:
judging whether the total number of the measurement error values of the preset distance measuring device is larger than a preset first number threshold value, and if so, judging that the occurrence probability that the measurement error values are larger than the preset first error threshold value is effective data; if not, continuing to acquire the measurement error value of the preset distance measuring device.
In this scheme, still include:
acquiring the number of the preset measurement error values in the centralized measurement error value;
judging whether the number of the measurement error values in the preset measurement error value set is larger than a preset second number threshold value, if so, starting measurement error value probability calculation;
obtaining an error revision value through measuring error value probability calculation;
and revising the distance value from the electronic tag to the RFID reader according to the error revising value.
In this scheme, the step of obtaining the error revised value by measuring the probability calculation of the error value specifically includes:
sequentially numbering the measurement error values in the preset measurement error value sets according to the sequence from large to small;
Setting the same measurement error value as the same number, and recording the number of the corresponding same measurement error value and the total number of the preset measurement error concentrated measurement error values;
obtaining the occurrence probability P of measurement error values with different numbers according to the number of the same measurement error values and the total number of the measurement error values in the preset measurement error set i The formula is as follows:
wherein N is i The number of the measurement error values of the ith number is represented, and N represents the total number of the measurement error values in the preset measurement error set;
based on a preset probability threshold, the method passes through the formula
Obtaining the minimum number m of the measurement error values, and setting the measurement error value corresponding to the minimum number m as an error revision value, wherein the P is 0 Expressed as a preset probability threshold, m.epsilon.i.
In this solution, the step of setting the distance value from the same electronic tag to the RFID reader to the distance value from the corresponding electronic tag to the RFID reader specifically includes:
acquiring time information of a reading instruction sent by the RFID;
extracting the motion trail of the same electronic tag stored in a preset electronic tag library;
obtaining a distance value from the same electronic tag to the RFID reader at a corresponding time point according to the time when the RFID sends a reading instruction and the motion trail of the same electronic tag stored in a preset electronic tag library;
And setting the distance value of the same electronic tag RFID reader as the distance value of the corresponding electronic tag to the RFID reader.
The second aspect of the present invention provides a self-power-regulating energy-saving RFID system comprising a memory and a processor, said memory storing a self-power-regulating energy-saving RFID method program, said self-power-regulating energy-saving RFID method program when executed by said processor performing the steps of:
acquiring electronic tag information;
comparing and analyzing the electronic tag with electronic tags in a preset electronic tag library, and judging whether the same electronic tag exists or not, if yes, setting the distance value from the same electronic tag to the RFID reader as the distance value from the corresponding electronic tag to the RFID reader;
if not, acquiring the direction of the electronic tag based on a preset camera device, and acquiring a measurement distance value of the electronic tag to the RFID reader based on a preset distance measuring device according to the direction of the electronic tag;
obtaining the transmitting power of the corresponding RFID reader according to the distance value from the electronic tag to the RFID reader;
and sending a reading instruction to the electronic tag according to the direction of the electronic tag and the transmitting power of the corresponding RFID reader.
In this scheme, still include:
acquiring a historical measurement distance value and a historical real distance value of a preset distance measuring device;
performing difference value calculation on the historical measured distance value and the historical real distance value of the preset distance measuring device to obtain a measured error value corresponding to the preset distance measuring device;
judging whether the measurement error value of the preset distance measuring device is larger than a preset first error threshold value, if so, deleting the measurement error value of the preset distance measuring device; if not, the measurement error value of the distance measuring device is sent to a preset measurement error value set for storage.
In this scheme, still include:
acquiring the number of measurement error values of a preset distance measuring device larger than a preset first error threshold value;
acquiring the total number of measurement error values of a preset distance measuring device;
obtaining the occurrence probability of the measurement error value larger than the preset first error threshold according to the number of the measurement error values of the preset distance measuring device larger than the preset first error threshold and the total number of the measurement error values of the preset distance measuring device;
judging whether the occurrence probability of the measurement error value larger than a preset first error threshold is larger than a preset first probability threshold, if so, triggering error prompt information of a preset distance measuring device;
And sending the error information of the preset distance measuring device to a preset management terminal for prompting.
In this scheme, still include:
judging whether the total number of the measurement error values of the preset distance measuring device is larger than a preset first number threshold value, and if so, judging that the occurrence probability that the measurement error values are larger than the preset first error threshold value is effective data; if not, continuing to acquire the measurement error value of the preset distance measuring device.
In this scheme, still include:
acquiring the number of the preset measurement error values in the centralized measurement error value;
judging whether the number of the measurement error values in the preset measurement error value set is larger than a preset second number threshold value, if so, starting measurement error value probability calculation;
obtaining an error revision value through measuring error value probability calculation;
and revising the distance value from the electronic tag to the RFID reader according to the error revising value.
In this scheme, the step of obtaining the error revised value by measuring the probability calculation of the error value specifically includes:
sequentially numbering the measurement error values in the preset measurement error value sets according to the sequence from large to small;
setting the same measurement error value as the same number, and recording the number of the corresponding same measurement error value and the total number of the preset measurement error concentrated measurement error values;
Obtaining the occurrence probability P of measurement error values with different numbers according to the number of the same measurement error values and the total number of the measurement error values in the preset measurement error set i The formula is as follows:
wherein N is i The number of the measurement error values of the ith number is represented, and N represents the total number of the measurement error values in the preset measurement error set;
based on a preset probability threshold, the method passes through the formula
Obtaining the minimum number m of the measurement error values, and setting the measurement error value corresponding to the minimum number m as an error revision value, wherein the P is 0 Expressed as a preset probability threshold, m.epsilon.i.
In this solution, the step of setting the distance value from the same electronic tag to the RFID reader to the distance value from the corresponding electronic tag to the RFID reader specifically includes:
acquiring time information of a reading instruction sent by the RFID;
extracting the motion trail of the same electronic tag stored in a preset electronic tag library;
obtaining a distance value from the same electronic tag to the RFID reader at a corresponding time point according to the time when the RFID sends a reading instruction and the motion trail of the same electronic tag stored in a preset electronic tag library;
and setting the distance value of the same electronic tag RFID reader as the distance value of the corresponding electronic tag to the RFID reader.
According to the energy-saving RFID method and system with self-adjusting power, a camera and a laser range finder are added in an RFID reader system, the target azimuth of an electronic tag is captured through the camera, and the distance from the target position to the RFID reader is measured through the laser range finder; in addition, for the regularly moving electronic tag, the distance from the target position to the RFID reader is directly obtained through the movement track of the electronic tag, and then the power of the RFID reader is controlled appropriately, and a reading instruction is sent to the direction of the electronic tag object, so that the optimal power saving effect is achieved.
Drawings
FIG. 1 illustrates a flow chart of an energy efficient RFID method of self-regulating power of the present invention;
FIG. 2 shows a schematic diagram of a self-regulating power energy-efficient RFID of the present invention;
FIG. 3 shows a schematic diagram of a self-regulating power energy efficient RFID system of the present invention;
fig. 4 shows a block diagram of a self-regulating power energy efficient RFID system of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
FIG. 1 shows a flow chart of an energy efficient RFID method of self-regulating power of the present invention.
As shown in fig. 1, the present invention discloses an energy-saving RFID method for self-regulating power, comprising:
s102, acquiring electronic tag information;
s104, comparing and analyzing the electronic tag with the electronic tag in the preset electronic tag library, and judging whether the same electronic tag exists, if so, setting the distance value from the same electronic tag to the RFID reader as the distance value from the corresponding electronic tag to the RFID reader;
s106, if not, acquiring the direction of the electronic tag based on a preset camera device, and acquiring a measurement distance value of the electronic tag to the RFID reader based on a preset distance measuring device according to the direction of the electronic tag;
s108, obtaining the transmitting power of the corresponding RFID reader according to the distance value from the electronic tag to the RFID reader;
s110, sending a reading instruction to the electronic tag according to the direction of the electronic tag and the transmitting power of the corresponding RFID reader.
It should be noted that, the electronic tags in the electronic tag library are regularly moved, and the movement track of the corresponding electronic tag is stored, and the distance value from the corresponding electronic tag to the RFID reader can be calculated through the current time, where the same electronic tag is the same electronic tag in the electronic tag library and the preset electronic tag library. The preset distance measuring device is one of infrared distance measuring, ultrasonic distance measuring, millimeter wave distance measuring and other distance measuring devices, the maximum distance of the electronic tag which can be read by the RFID system is in linear relation with the transmitting power of the RFID system, the greater the power is, the farther the distance of the tag which can be read is, and the formula is W=k x L+W 0 Wherein W represents the RFID reader transmit power, k represents the distance value of the electronic tag to the RFID reader and the conversion coefficient of the RFID reader transmit power, L represents the measured distance value of the electronic tag to the RFID reader, W 0 Representing the base transmit power of the RFID reader.
According to an embodiment of the present invention, further comprising:
acquiring a historical measurement distance value and a historical real distance value of a preset distance measuring device;
performing difference value calculation on the historical measured distance value and the historical real distance value of the preset distance measuring device to obtain a measured error value corresponding to the preset distance measuring device;
Judging whether the measurement error value of the preset distance measuring device is larger than a preset first error threshold value, if so, deleting the measurement error value of the preset distance measuring device; if not, the measurement error value of the distance measuring device is sent to a preset measurement error value set for storage.
It should be noted that, comparing and analyzing the historical measured distance value and the historical true distance value of the preset distance measuring device to determine an error value of the corresponding distance measuring device, wherein when the historical measured distance value and the historical true distance value are the same, the measured error value of the corresponding preset distance measuring device is zero, and the preset first error threshold is set by a person skilled in the art according to actual requirements.
According to an embodiment of the present invention, further comprising:
acquiring the number of measurement error values of a preset distance measuring device larger than a preset first error threshold value;
acquiring the total number of measurement error values of a preset distance measuring device;
obtaining the occurrence probability of the measurement error value larger than the preset first error threshold according to the number of the measurement error values of the preset distance measuring device larger than the preset first error threshold and the total number of the measurement error values of the preset distance measuring device;
judging whether the occurrence probability of the measurement error value larger than a preset first error threshold is larger than a preset first probability threshold, if so, triggering error prompt information of a preset distance measuring device;
And sending the error information of the preset distance measuring device to a preset management terminal for prompting.
It should be noted that, the number of the measurement error values of the preset distance measuring device larger than the preset first error threshold is set as x 1 Setting the total number of the measurement error values of the preset distance measuring device as x, and correspondingly setting the occurrence probability that the measurement error value is larger than the preset first error threshold value
Setting the preset first probability threshold to A, when P x >When A, the occurrence probability of the corresponding measurement error value larger than a preset first error threshold value is too high, and error prompt information of a preset distance measuring device is triggered; then when P x And when the occurrence probability of the corresponding preset first error threshold value is lower than or equal to A, setting the corresponding event as an event which cannot occur, and setting the corresponding distance measuring device to be normal.
According to an embodiment of the present invention, further comprising:
judging whether the total number of the measurement error values of the preset distance measuring device is larger than a preset first number threshold value, and if so, judging that the occurrence probability that the measurement error values are larger than the preset first error threshold value is effective data; if not, continuing to acquire the measurement error value of the preset distance measuring device.
In order to prevent accidental operation of the preset distance measuring device, the preset distance measuring device is improved Processing the measurement error value of the preset distance measuring device when the total number of the measurement error values of the preset distance measuring device is larger than a preset first number threshold value; for example, the first quantity threshold is preset to x max1 Then when x>x max1 And when the measurement error value is larger than the occurrence probability of the preset first error threshold value, setting the measurement error value as effective data, otherwise, continuously adding the measurement error value of the preset distance measuring device, wherein the total number of the measurement error values of the preset distance measuring device comprises the same measurement error value.
According to an embodiment of the present invention, further comprising:
acquiring the number of the preset measurement error values in the centralized measurement error value;
judging whether the number of the measurement error values in the preset measurement error value set is larger than a preset second number threshold value, if so, starting measurement error value probability calculation;
obtaining an error revision value through measuring error value probability calculation;
and revising the distance value from the electronic tag to the RFID reader according to the error revising value.
It should be noted that, the number of the measurement error values in the preset measurement error value set is set as N, and the preset second number threshold is set as x max2 Wherein when N>x max2 And when the number of the measurement error values in the set corresponding to the preset measurement error values meets the requirement, starting the calculation of the probability of the measurement error values, and obtaining an error revision value delta L through the calculation of the probability of the measurement error values, wherein the distance value from the electronic tag to the RFID reader is revised to be L+delta L.
According to the embodiment of the invention, the step of obtaining the error revised value through measuring the error value probability calculation specifically comprises the following steps:
sequentially numbering the measurement error values in the preset measurement error value sets according to the sequence from large to small;
setting the same measurement error value as the same number, and recording the number of the corresponding same measurement error value and the total number of the preset measurement error concentrated measurement error values;
based on the same measurement errorThe number of the values and the total number of the measurement error values in the preset measurement error set obtain the occurrence probability P of the measurement error values with different numbers i The formula is as follows:
wherein N is i The number of the measurement error values of the ith number is represented, and N represents the total number of the measurement error values in the preset measurement error set;
based on a preset probability threshold, the method passes through the formula
Obtaining the minimum number m of the measurement error values, and setting the measurement error value corresponding to the minimum number m as an error revision value, wherein the P is 0 Expressed as a preset probability threshold, m.epsilon.i.
It should be noted that, the measurement error values in the preset measurement error value set are numbered sequentially in order from large to small, for example, if the number of the first measurement error value is set to 1, the number of the second measurement error value is set to 2, and the measurement error value corresponding to the minimum number m is set to the error revision value Δl.
According to an embodiment of the present invention, the step of setting the distance value from the same electronic tag to the RFID reader to the distance value from the corresponding electronic tag to the RFID reader specifically includes:
acquiring time information of a reading instruction sent by the RFID;
extracting the motion trail of the same electronic tag stored in a preset electronic tag library;
obtaining a distance value from the same electronic tag to the RFID reader at a corresponding time point according to the time when the RFID sends a reading instruction and the motion trail of the same electronic tag stored in a preset electronic tag library;
and setting the distance value of the same electronic tag RFID reader as the distance value of the corresponding electronic tag to the RFID reader.
It should be noted that the same electronic tag is the same electronic tag in the electronic tag and the preset electronic tag library, the motion trail stored in the preset electronic tag library corresponding to the electronic tag is extracted through the same electronic tag, the motion trail includes the motion trail of the corresponding electronic tag changing along with time, the position of the electronic tag corresponding to time on the motion trail is determined by acquiring the time when the RFID sends a reading instruction, and the distance value from the same electronic tag to the RFID reader is determined by the position of the electronic tag on the motion trail.
According to an embodiment of the present invention, the step of acquiring the direction of the electronic tag based on the preset image capturing device specifically includes:
shooting the electronic tag through a preset shooting device to obtain an electronic tag photo;
extracting the position of an electronic tag in the electronic tag photo;
based on a preset reference point, the direction of the position of the electronic tag at the preset reference point is obtained;
and setting the direction of the position of the electronic tag at the preset reference point as the direction corresponding to the electronic tag.
It should be noted that, taking a picture of the electronic tag through a preset camera device to obtain a photo of the electronic tag, extracting a position of the electronic tag in the photo of the electronic tag, determining a direction of the position of the corresponding electronic tag at the preset reference point based on the preset reference point, for example, if the position of the corresponding electronic tag is 30 degrees right in front of the preset reference point, the direction of the electronic tag uses an emission direction of the RFID reader as a reference, and the preset reference point is set by a person skilled in the art according to actual requirements.
According to an embodiment of the present invention, further comprising:
acquiring historical distance values from the electronic tag to the RFID reader at different time points;
The historical distance values from the electronic tag to the RFID reader at different time points are sent to preset drawing software, and a historical motion track of the corresponding electronic tag is obtained;
judging whether the historical motion trail of the electronic tag has the same association coefficient or association function on the distance values corresponding to different time points, if so, setting the historical motion trail of the corresponding electronic tag as a regular motion trail;
and sending the regular motion trail and the corresponding electronic tag to a preset electronic tag library for storage.
It should be noted that, the historical distance values from the electronic tag to the RFID reader at different time points are sent to preset drawing software, such as autocad, and the historical distance values from the electronic tag to the RFID reader at different time points are arranged according to time sequence through the preset drawing software, and the historical motion trail of the corresponding electronic tag is drawn, if the historical motion trail of the electronic tag has the same association coefficient or association function at the distance values corresponding to different time points, the historical motion trail of the corresponding electronic tag is set to be a regular motion trail, and the corresponding association coefficient or association function is determined through the historical distance values from the electronic tag to the RFID reader at different time points, so as to obtain a motion trail formula corresponding to the RFID reader.
According to an embodiment of the present invention, further comprising:
acquiring historical calculation transmitting power and historical actual transmitting power of the RFID reader;
according to the historical calculation transmitting power and the historical actual transmitting power of the RFID reader, obtaining a historical transmitting power difference of the corresponding RFID reader;
the current RFID reader transmission power is revised according to the historical transmission power difference of the corresponding RFID reader.
In order to avoid errors between the design power and the actual power of the RFID reader, the historically calculated transmit power of the RFID reader is set to W 1 The historical actual transmitting power is set to W 2 Then the historical transmission power difference Δw=w for the corresponding RFID reader 2 -W 1 The formula of the current RFID reader transmitting power after revising is W=k×L+W 0 +ΔW。
Fig. 2 shows a schematic diagram of a self-regulating power energy-efficient RFID of the present invention.
As shown in fig. 2, the object B represents an RFID system, the object a with an electronic tag performs large circular motion, and needs to detect the passing time of the object at three positions of points a, B and C of the circular track of the motion, because the distance between the RFID and the three detection points varies greatly, from less than one meter to 20 meters at the most, the requirement on the emitting power of the RFID varies greatly, and considering that the emitting device of the RFID is a mobile charging type device, the use of electric energy is saved to the greatest extent to improve the recharging interval. Before each time of measuring the target object, the camera captures the target object, after tracking and locking the target object, the laser range finder dynamically detects the distance of the target object, then the control system detects the actual distance of the target object, adjusts the proper RFID transmitting power, and detects and extracts data from the target object.
Fig. 3 shows a schematic diagram of a self-regulating power energy-efficient RFID system according to the invention.
As shown in fig. 3, the RFID system includes a control module, a ranging module, an RFID transmitting module and an electronic tag module, where the ranging module includes a camera device and a ranging device, and determines positions and directions of corresponding electronic tags through the camera device and the ranging device, the control module is associated with the ranging module and the RFID transmitting module, and dynamically adjusts transmitting power of the system according to distance data measured by the ranging module, and the electronic tag module includes current electronic tag information and historical electronic tag information.
Fig. 4 shows a block diagram of a self-regulating power energy efficient RFID system of the present invention.
As shown in fig. 4, the second aspect of the present invention provides a self-power-regulating energy-saving RFID system 4, comprising a memory 41 and a processor 42, said memory having stored therein a self-power-regulating energy-saving RFID method program which when executed by said processor implements the steps of:
acquiring electronic tag information;
comparing and analyzing the electronic tag with electronic tags in a preset electronic tag library, and judging whether the same electronic tag exists or not, if yes, setting the distance value from the same electronic tag to the RFID reader as the distance value from the corresponding electronic tag to the RFID reader;
If not, acquiring the direction of the electronic tag based on a preset camera device, and acquiring a measurement distance value of the electronic tag to the RFID reader based on a preset distance measuring device according to the direction of the electronic tag;
obtaining the transmitting power of the corresponding RFID reader according to the distance value from the electronic tag to the RFID reader;
and sending a reading instruction to the electronic tag according to the direction of the electronic tag and the transmitting power of the corresponding RFID reader.
It should be noted that, the electronic tags in the electronic tag library are regularly moved, and the movement track of the corresponding electronic tag is stored, and the distance value from the corresponding electronic tag to the RFID reader can be calculated through the current time, where the same electronic tag is the same electronic tag in the electronic tag library and the preset electronic tag library. The preset distance measuring device is one of infrared distance measuring, ultrasonic distance measuring, millimeter wave distance measuring and other distance measuring devices, the maximum distance of the electronic tag which can be read by the RFID system is in linear relation with the transmitting power of the RFID system, the greater the power is, the farther the distance of the tag which can be read is, and the formula is W=k x L+W 0 Wherein W represents the RFID reader transmit power, k represents the distance value of the electronic tag to the RFID reader and the conversion coefficient of the RFID reader transmit power, L represents the measured distance value of the electronic tag to the RFID reader, W 0 Representing the base transmit power of the RFID reader.
According to an embodiment of the present invention, further comprising:
acquiring a historical measurement distance value and a historical real distance value of a preset distance measuring device;
performing difference value calculation on the historical measured distance value and the historical real distance value of the preset distance measuring device to obtain a measured error value corresponding to the preset distance measuring device;
judging whether the measurement error value of the preset distance measuring device is larger than a preset first error threshold value, if so, deleting the measurement error value of the preset distance measuring device; if not, the measurement error value of the distance measuring device is sent to a preset measurement error value set for storage.
It should be noted that, comparing and analyzing the historical measured distance value and the historical true distance value of the preset distance measuring device to determine an error value of the corresponding distance measuring device, wherein when the historical measured distance value and the historical true distance value are the same, the measured error value of the corresponding preset distance measuring device is zero, and the preset first error threshold is set by a person skilled in the art according to actual requirements.
According to an embodiment of the present invention, further comprising:
acquiring the number of measurement error values of a preset distance measuring device larger than a preset first error threshold value;
Acquiring the total number of measurement error values of a preset distance measuring device;
obtaining the occurrence probability of the measurement error value larger than the preset first error threshold according to the number of the measurement error values of the preset distance measuring device larger than the preset first error threshold and the total number of the measurement error values of the preset distance measuring device;
judging whether the occurrence probability of the measurement error value larger than a preset first error threshold is larger than a preset first probability threshold, if so, triggering error prompt information of a preset distance measuring device;
and sending the error information of the preset distance measuring device to a preset management terminal for prompting.
It should be noted that, the number of the measurement error values of the preset distance measuring device larger than the preset first error threshold is set as x 1 Setting the total number of the measurement error values of the preset distance measuring device as x, and correspondingly setting the occurrence probability that the measurement error value is larger than the preset first error threshold value
Setting the preset first probability threshold to A, when P x >When A, the occurrence probability of the corresponding measurement error value larger than a preset first error threshold value is too high, and error prompt information of a preset distance measuring device is triggered; then when P x When A is less than or equal to A, corresponding to the preset first error threshold valueThe occurrence probability of the corresponding event is set to be an event which cannot occur, and the corresponding distance measuring device is normal.
According to an embodiment of the present invention, further comprising:
judging whether the total number of the measurement error values of the preset distance measuring device is larger than a preset first number threshold value, and if so, judging that the occurrence probability that the measurement error values are larger than the preset first error threshold value is effective data; if not, continuing to acquire the measurement error value of the preset distance measuring device.
It should be noted that, in order to prevent the accident of the preset ranging device, the total number of measurement error values of the preset ranging device is increased, and the measurement error values of the preset ranging device are processed when the total number of measurement error values of the preset ranging device is greater than a preset first number threshold; for example, the first quantity threshold is preset to x max1 Then when x>x max1 And when the measurement error value is larger than the occurrence probability of the preset first error threshold value, setting the measurement error value as effective data, otherwise, continuously adding the measurement error value of the preset distance measuring device, wherein the total number of the measurement error values of the preset distance measuring device comprises the same measurement error value.
According to an embodiment of the present invention, further comprising:
acquiring the number of the preset measurement error values in the centralized measurement error value;
judging whether the number of the measurement error values in the preset measurement error value set is larger than a preset second number threshold value, if so, starting measurement error value probability calculation;
Obtaining an error revision value through measuring error value probability calculation;
and revising the distance value from the electronic tag to the RFID reader according to the error revising value.
It should be noted that, the number of the measurement error values in the preset measurement error value set is set as N, and the preset second number threshold is set as x max2 Wherein when N>x max2 When the number of the measurement error values in the set corresponding to the preset measurement error values meets the requirement, starting the calculation of the probability of the measurement error values, and obtaining an error revision value delta L through the calculation of the probability of the measurement error values, wherein the error revision value delta L is obtained by the calculation of the probability of the measurement error valuesThe distance value of the electronic tag to the RFID reader is revised to L + deltal.
According to the embodiment of the invention, the step of obtaining the error revised value through measuring the error value probability calculation specifically comprises the following steps:
sequentially numbering the measurement error values in the preset measurement error value sets according to the sequence from large to small;
setting the same measurement error value as the same number, and recording the number of the corresponding same measurement error value and the total number of the preset measurement error concentrated measurement error values;
obtaining the occurrence probability P of measurement error values with different numbers according to the number of the same measurement error values and the total number of the measurement error values in the preset measurement error set i The formula is as follows:
wherein N is i The number of the measurement error values of the ith number is represented, and N represents the total number of the measurement error values in the preset measurement error set;
based on a preset probability threshold, the method passes through the formula
Obtaining the minimum number m of the measurement error values, and setting the measurement error value corresponding to the minimum number m as an error revision value, wherein the P is 0 Expressed as a preset probability threshold, m.epsilon.i.
It should be noted that, the measurement error values in the preset measurement error value set are numbered sequentially in order from large to small, for example, if the number of the first measurement error value is set to 1, the number of the second measurement error value is set to 2, and the measurement error value corresponding to the minimum number m is set to the error revision value Δl.
According to an embodiment of the present invention, the step of setting the distance value from the same electronic tag to the RFID reader to the distance value from the corresponding electronic tag to the RFID reader specifically includes:
acquiring time information of a reading instruction sent by the RFID;
extracting the motion trail of the same electronic tag stored in a preset electronic tag library;
obtaining a distance value from the same electronic tag to the RFID reader at a corresponding time point according to the time when the RFID sends a reading instruction and the motion trail of the same electronic tag stored in a preset electronic tag library;
And setting the distance value of the same electronic tag RFID reader as the distance value of the corresponding electronic tag to the RFID reader.
It should be noted that the same electronic tag is the same electronic tag in the electronic tag and the preset electronic tag library, the motion trail stored in the preset electronic tag library corresponding to the electronic tag is extracted through the same electronic tag, the motion trail includes the motion trail of the corresponding electronic tag changing along with time, the position of the electronic tag corresponding to time on the motion trail is determined by acquiring the time when the RFID sends a reading instruction, and the distance value from the same electronic tag to the RFID reader is determined by the position of the electronic tag on the motion trail.
According to an embodiment of the present invention, the step of acquiring the direction of the electronic tag based on the preset image capturing device specifically includes:
shooting the electronic tag through a preset shooting device to obtain an electronic tag photo;
extracting the position of an electronic tag in the electronic tag photo;
based on a preset reference point, the direction of the position of the electronic tag at the preset reference point is obtained;
and setting the direction of the position of the electronic tag at the preset reference point as the direction corresponding to the electronic tag.
It should be noted that, taking a picture of the electronic tag through a preset camera device to obtain a photo of the electronic tag, extracting a position of the electronic tag in the photo of the electronic tag, determining a direction of the position of the corresponding electronic tag at the preset reference point based on the preset reference point, for example, if the position of the corresponding electronic tag is 30 degrees right in front of the preset reference point, the direction of the electronic tag uses an emission direction of the RFID reader as a reference, and the preset reference point is set by a person skilled in the art according to actual requirements.
According to an embodiment of the present invention, further comprising:
acquiring historical distance values from the electronic tag to the RFID reader at different time points;
the historical distance values from the electronic tag to the RFID reader at different time points are sent to preset drawing software, and a historical motion track of the corresponding electronic tag is obtained;
judging whether the historical motion trail of the electronic tag has the same association coefficient or association function on the distance values corresponding to different time points, if so, setting the historical motion trail of the corresponding electronic tag as a regular motion trail;
and sending the regular motion trail and the corresponding electronic tag to a preset electronic tag library for storage.
It should be noted that, the historical distance values from the electronic tag to the RFID reader at different time points are sent to preset drawing software, such as autocad, and the historical distance values from the electronic tag to the RFID reader at different time points are arranged according to time sequence through the preset drawing software, and the historical motion trail of the corresponding electronic tag is drawn, if the historical motion trail of the electronic tag has the same association coefficient or association function at the distance values corresponding to different time points, the historical motion trail of the corresponding electronic tag is set to be a regular motion trail, and the corresponding association coefficient or association function is determined through the historical distance values from the electronic tag to the RFID reader at different time points, so as to obtain a motion trail formula corresponding to the RFID reader.
According to an embodiment of the present invention, further comprising:
acquiring historical calculation transmitting power and historical actual transmitting power of the RFID reader;
according to the historical calculation transmitting power and the historical actual transmitting power of the RFID reader, obtaining a historical transmitting power difference of the corresponding RFID reader;
the current RFID reader transmission power is revised according to the historical transmission power difference of the corresponding RFID reader.
In order to avoid errors between the design power and the actual power of the RFID reader, the historically calculated transmit power of the RFID reader is set to W 1 The historical actual transmitting power is set to W 2 Then the historical transmission power difference Δw=w for the corresponding RFID reader 2 -W 1 The formula of the current RFID reader transmitting power after revising is W=k×L+W 0 +ΔW。
The invention discloses an energy-saving RFID method and system for self-regulating power, wherein the method comprises the following steps: acquiring electronic tag information; comparing and analyzing the electronic tag with electronic tags in a preset electronic tag library, and judging whether the same electronic tag exists or not, if yes, setting the distance value from the same electronic tag to the RFID reader as the distance value from the corresponding electronic tag to the RFID reader; if not, acquiring the direction of the electronic tag based on a preset camera device, and acquiring a measurement distance value of the electronic tag to the RFID reader based on a preset distance measuring device according to the direction of the electronic tag; obtaining the transmitting power of the corresponding RFID reader according to the distance value from the electronic tag to the RFID reader; and sending a reading instruction to the electronic tag according to the direction of the electronic tag and the transmitting power of the corresponding RFID reader. The invention saves the transmitting power of the RFID system and reduces the electromagnetic radiation to the environment.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of the units is only one logical function division, and there may be other divisions in practice, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.
The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units; can be located in one place or distributed to a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present invention may be integrated in one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk or an optical disk, or the like, which can store program codes.
Alternatively, the above-described integrated units of the present invention may be stored in a computer-readable storage medium if implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in essence or a part contributing to the prior art in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, ROM, RAM, magnetic or optical disk, or other medium capable of storing program code.
Claims (10)
1. An energy efficient RFID method of self-regulating power, comprising:
acquiring electronic tag information;
comparing and analyzing the electronic tag with electronic tags in a preset electronic tag library, and judging whether the same electronic tag exists or not, if yes, setting the distance value from the same electronic tag to the RFID reader as the distance value from the corresponding electronic tag to the RFID reader;
if not, acquiring the direction of the electronic tag based on a preset camera device, and acquiring a measurement distance value of the electronic tag to the RFID reader based on a preset distance measuring device according to the direction of the electronic tag;
obtaining the transmitting power of the corresponding RFID reader according to the distance value from the electronic tag to the RFID reader;
and sending a reading instruction to the electronic tag according to the direction of the electronic tag and the transmitting power of the corresponding RFID reader.
2. The self-regulating power saving RFID method as recited in claim 1, further comprising:
acquiring a historical measurement distance value and a historical real distance value of a preset distance measuring device;
performing difference value calculation on the historical measured distance value and the historical real distance value of the preset distance measuring device to obtain a measured error value corresponding to the preset distance measuring device;
Judging whether the measurement error value of the preset distance measuring device is larger than a preset first error threshold value, if so, deleting the measurement error value of the preset distance measuring device; if not, the measurement error value of the distance measuring device is sent to a preset measurement error value set for storage.
3. The self-regulating power saving RFID method as recited in claim 2, further comprising:
acquiring the number of measurement error values of a preset distance measuring device larger than a preset first error threshold value;
acquiring the total number of measurement error values of a preset distance measuring device;
obtaining the occurrence probability of the measurement error value larger than the preset first error threshold according to the number of the measurement error values of the preset distance measuring device larger than the preset first error threshold and the total number of the measurement error values of the preset distance measuring device;
judging whether the occurrence probability of the measurement error value larger than a preset first error threshold is larger than a preset first probability threshold, if so, triggering error prompt information of a preset distance measuring device;
and sending the error information of the preset distance measuring device to a preset management terminal for prompting.
4. A self-regulating power saving RFID method as claimed in claim 3, further comprising:
Judging whether the total number of the measurement error values of the preset distance measuring device is larger than a preset first number threshold value, and if so, judging that the occurrence probability that the measurement error values are larger than the preset first error threshold value is effective data; if not, continuing to acquire the measurement error value of the preset distance measuring device.
5. The self-regulating power saving RFID method as recited in claim 2, further comprising:
acquiring the number of the preset measurement error values in the centralized measurement error value;
judging whether the number of the measurement error values in the preset measurement error value set is larger than a preset second number threshold value, if so, starting measurement error value probability calculation;
obtaining an error revision value through measuring error value probability calculation;
and revising the distance value from the electronic tag to the RFID reader according to the error revising value.
6. The self-power-regulating energy-saving RFID method as claimed in claim 5, wherein said step of obtaining an error correction value by measuring an error value probability calculation comprises:
sequentially numbering the measurement error values in the preset measurement error value sets according to the sequence from large to small;
setting the same measurement error value as the same number, and recording the number of the corresponding same measurement error value and the total number of the preset measurement error concentrated measurement error values;
Obtaining the occurrence probability P of measurement error values with different numbers according to the number of the same measurement error values and the total number of the measurement error values in the preset measurement error set i The formula is as follows:
wherein N is i The number of the measurement error values of the ith number is represented, and N represents the total number of the measurement error values in the preset measurement error set;
based on a preset probability threshold, the method passes through the formula
Obtaining the minimum number m of the measurement error values, and setting the measurement error value corresponding to the minimum number m as an error revision value, wherein the P is 0 Expressed as a preset probability threshold, m.epsilon.i.
7. The method according to claim 1, wherein the step of setting the distance value of the same electronic tag to the RFID reader to the distance value of the corresponding electronic tag to the RFID reader specifically comprises:
acquiring time information of a reading instruction sent by the RFID;
extracting the motion trail of the same electronic tag stored in a preset electronic tag library;
obtaining a distance value from the same electronic tag to the RFID reader at a corresponding time point according to the time when the RFID sends a reading instruction and the motion trail of the same electronic tag stored in a preset electronic tag library;
and setting the distance value of the same electronic tag RFID reader as the distance value of the corresponding electronic tag to the RFID reader.
8. A self-regulating power-efficient RFID system comprising a memory and a processor, said memory having stored therein a self-regulating power-efficient RFID method program which when executed by said processor performs the steps of:
acquiring electronic tag information;
comparing and analyzing the electronic tag with electronic tags in a preset electronic tag library, and judging whether the same electronic tag exists or not, if yes, setting the distance value from the same electronic tag to the RFID reader as the distance value from the corresponding electronic tag to the RFID reader;
if not, acquiring the direction of the electronic tag based on a preset camera device, and acquiring a measurement distance value of the electronic tag to the RFID reader based on a preset distance measuring device according to the direction of the electronic tag;
obtaining the transmitting power of the corresponding RFID reader according to the distance value from the electronic tag to the RFID reader;
and sending a reading instruction to the electronic tag according to the direction of the electronic tag and the transmitting power of the corresponding RFID reader.
9. The self-regulating power saving RFID system of claim 8, further comprising:
Acquiring a historical measurement distance value and a historical real distance value of a preset distance measuring device;
performing difference value calculation on the historical measured distance value and the historical real distance value of the preset distance measuring device to obtain a measured error value corresponding to the preset distance measuring device;
judging whether the measurement error value of the preset distance measuring device is larger than a preset first error threshold value, if so, deleting the measurement error value of the preset distance measuring device; if not, the measurement error value of the distance measuring device is sent to a preset measurement error value set for storage.
10. The self-regulating power saving RFID system of claim 9, further comprising:
acquiring the number of measurement error values of a preset distance measuring device larger than a preset first error threshold value;
acquiring the total number of measurement error values of a preset distance measuring device;
obtaining the occurrence probability of the measurement error value larger than the preset first error threshold according to the number of the measurement error values of the preset distance measuring device larger than the preset first error threshold and the total number of the measurement error values of the preset distance measuring device;
judging whether the occurrence probability of the measurement error value larger than a preset first error threshold is larger than a preset first probability threshold, if so, triggering error prompt information of a preset distance measuring device;
And sending the error information of the preset distance measuring device to a preset management terminal for prompting.
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