CN112668683A - Intelligent safety door and detection method thereof - Google Patents
Intelligent safety door and detection method thereof Download PDFInfo
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- CN112668683A CN112668683A CN202011567574.9A CN202011567574A CN112668683A CN 112668683 A CN112668683 A CN 112668683A CN 202011567574 A CN202011567574 A CN 202011567574A CN 112668683 A CN112668683 A CN 112668683A
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Abstract
The invention provides an intelligent safety door and a detection method thereof, wherein the intelligent safety door comprises a main door, an auxiliary door and a controller which are oppositely arranged, wherein the controller comprises at least two frequency modulation antennas, a multiplexer and a read-write module; the main door and the auxiliary door are at least provided with one frequency modulation antenna, and the two frequency modulation antennas are controlled to switch working frequency points between different frequency points on the same working frequency band and are used for transmitting read-write signals to the opposite door and receiving corresponding response signals; the multiplexer is used for controlling the read-write signal and the response signal to pass through in a time division duplex mode; the read-write module is used for polling and controlling the multiplexer to pass through the read-write signals of different frequency points in different time slots, synchronously controlling the frequency modulation antenna to be switched to a corresponding frequency point to transmit a corresponding read-write signal, and analyzing the response signal into label data to be output. The plurality of frequency modulation antennas of the intelligent safety door poll and radiate read-write signals of different frequency points in different time slots.
Description
Technical Field
The invention relates to the technical field of radio frequency, in particular to an intelligent safety door and an intelligent safety door detection method.
Background
At present, radio frequency tags are widely applied to various industries, and basic engineering of commodity and identity recognition and building networking is realized by reading and writing the radio frequency tags and checking the legality of the radio frequency tags. For example, a security gate is arranged at an exit of a supermarket to detect whether goods carried by customers have finished a payment procedure; and arranging safety doors at a conference entrance, a library entrance, an exhibition hall entrance and a company entrance, and verifying whether the personnel carrying or wearing the radio frequency tag has the right to enter the places or not through the safety doors.
In practice, when a plurality of stacked radio frequency tags pass through the security gate at the same time, mutual interference can be generated among the radio frequency tags, so that frequency points of some radio frequency tags can be deviated, the security gate in the prior art only transmits radio frequency signals corresponding to the frequency points of the radio frequency tags which are not deviated, and therefore response signals returned by the radio frequency tags with deviated frequencies cannot be read, and therefore the radio frequency tags cannot be effectively identified, and economic loss or hidden security risks are caused.
Disclosure of Invention
One of the purposes of the invention is to provide an intelligent security door capable of adjusting read-write signal frequency points.
The invention also aims to provide an intelligent safety door detection method.
One of the objectives of the present invention is to provide an intelligent security door, which includes a main door, an auxiliary door and a controller, wherein the main door, the auxiliary door and the controller are oppositely disposed, and the intelligent security door is characterized in that:
the controller comprises at least two frequency modulation antennas, a multiplexer and a read-write module;
the main door and the auxiliary door are at least provided with one frequency modulation antenna, and the two frequency modulation antennas are controlled to switch working frequency points between different frequency points on the same working frequency band and are used for transmitting read-write signals to the opposite door and receiving corresponding response signals;
the multiplexer is used for controlling the read-write signal and the response signal to pass through in a time division duplex mode;
the read-write module is used for polling and controlling the multiplexer to pass through the read-write signals of different frequency points in different time slots, synchronously controlling the frequency modulation antenna to be switched to a corresponding frequency point to transmit a corresponding read-write signal, and analyzing the response signal into label data to be output.
Furthermore, a plurality of frequency modulation antennas are arranged on the main door and/or the auxiliary door, and the plurality of frequency modulation antennas on each door are respectively positioned at different height positions.
Furthermore, a plurality of frequency modulation antennas on the main door and/or the auxiliary door are connected in parallel to the same multiplexer.
Furthermore, all frequency modulation antennas on the main door and/or the auxiliary door are synchronously controlled by the read-write module and work at the same frequency point in the same time slot.
Preferably, the intelligent security gate further comprises a control center, the control center receives the tag data and tag information prestored in the database for matching verification, and when the related tag information cannot be matched, the control center outputs alarm information;
or, the intelligent security gate further comprises a control center, wherein the control center receives the tag data, detects whether each tag data contains a specific identifier, and outputs alarm information when the tag data contains/does not contain the specific identifier.
Specifically, the intelligent security door still includes human response module, human response module set up in main door and/or vice door are interior for the response obtains human activity signal in order to drive the work of reading and writing module.
Further, the frequency modulation antenna comprises:
the antenna oscillator is used for transmitting a read-write signal or receiving a response signal;
a plurality of resonant circuits forming a resonant circuit with the antenna element;
at least one of the resonant circuits is connected in parallel with a switch circuit, and the switch circuit is controlled by the high/low level of the control signal output by the read-write module to correspondingly switch on/off the resonant circuit controlled by the switch circuit so as to switch the working frequency point of the antenna oscillator.
Furthermore, the controller also comprises signal generators respectively used for generating the signals of different frequency points, and each signal generator responds to corresponding different voltage signals output by the read-write module to generate read-write signals corresponding to different frequency points.
Specifically, the controller further comprises a modulator and an amplifying circuit, the modulator is connected in series with one or more signal generators to modulate the read-write signals generated by the generators into radio frequency signals, and the amplifying circuit is connected in series with the modulator to match and amplify the radio frequency signals and output the radio frequency signals to the multiplexer.
Specifically, the controller further includes at least one receiving circuit, where the receiving circuit is connected in series with the multiplexer and the read/write module, and is configured to analyze and output the response signal received by the multiplexer to the read/write module.
The invention is suitable for another purpose and provides an intelligent safety door detection method, which is characterized by comprising the following steps:
the drive read-write module transmits read-write signals of different frequency points on the same working frequency band to the frequency modulation antennas in the main door and the auxiliary door in a polling mode in different time slots;
receiving a plurality of response signals responding to the read-write signals through the frequency modulation antenna, and analyzing the plurality of response signals by a read-write module to obtain corresponding unique tag data;
and carrying out validity verification according to the tag data, and outputting alarm information when illegal tag data is verified.
Further, the method also comprises the following steps: and detecting a human body activity signal between the main door and the auxiliary door, and executing the subsequent steps after detecting that the human body activity signal exists.
Further, in the step of performing validity verification according to the tag data, and outputting alarm information when illegal tag data is verified, the step of: the control center receives the label data and label information prestored in the database to carry out matching verification, and outputs alarm information when the relevant label information cannot be matched;
or the control center receives the tag data, detects whether each tag data contains a specific identifier, and outputs alarm information when the tag data contains/does not contain the specific identifier.
And updating the use times of the label data by using the unique label data acquired by the read-write module.
Specifically, in the step of sending read-write signals of different frequency points on the same working frequency band to the frequency modulation antennas of the main gate and/or the sub-gate in a polling manner in different time slots by the drive read-write module, the read-write module outputs a control signal to synchronously control the on/off of one or more tuning circuits in each frequency modulation antenna so as to adjust the working frequency points of the frequency modulation antennas.
Compared with the prior art, the invention has the following advantages:
the read-write module of the intelligent safety door polls and controls the multiplexer to pass read-write signals of different frequency points in different time slots, and synchronously controls the working frequency points of the frequency modulation antennas arranged on the main door and the auxiliary door, so that the frequency modulation antennas can adjust the working frequency points relative to the read-write signals, and further the frequency modulation antennas can poll and transmit the read-write signals of different frequency points, so that radio frequency tags of different frequency points can be quickly read and written, and the radio frequency tags are prevented from being missed to be read. Even if the frequency offset phenomenon occurs due to the fact that a plurality of radio frequency tags are stacked mutually, the frequency offset phenomenon is usually a small amount of offset, and when the read-write module reads and writes the radio frequency tags at another adjacent frequency point, the radio frequency tags with the frequency offset can still be effectively read. For products with high safety requirements, such as the intelligent safety door, the reliability of the intelligent safety door can be improved by ensuring effective identification of various radio frequency tags by applying the technical scheme of the invention, so that the economic benefit and safety of users are ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a deployment architecture of an intelligent security gate according to the present invention
Fig. 2 is a schematic block circuit diagram of an embodiment of the intelligent security gate of the present invention.
Fig. 3 is a schematic circuit diagram of a frequency modulation antenna used in the intelligent security gate of the present invention.
Fig. 4 is a schematic flow chart of the intelligent security door detection method of the present invention.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
It should be understood that the various steps recited in the method embodiments of the present invention may be performed in a different order and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the invention is not limited in this respect.
The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "coupled" may refer to direct coupling or indirect coupling via intermediate members (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description.
It should be noted that the terms "first", "second", and the like in the present invention are only used for distinguishing the devices, modules or units, and are not used for limiting the devices, modules or units to be different devices, modules or units, and are not used for limiting the sequence or interdependence relationship of the functions executed by the devices, modules or units.
The intelligent safety door provided by the invention reads the radio frequency tags with different frequency points by adjusting the working frequency of the transmitted read-write signal. Considering that the range of the offset frequency generated by the radio frequency tag is generally limited, the operating frequency is generally controlled to be in a narrow operating frequency band, for example, the operating frequency band occupies a bandwidth of 1-10MHz, even only occupies a bandwidth of 1-2MHz, correspondingly, when the read-write signal is transmitted, different frequency points in the operating frequency band can be transmitted, and the intervals of the different frequency points can be adjusted by taking, for example, 1MHz or 2MHz as the width, so as to implement a plurality of polling-switched operating frequency points in the operating frequency band range.
Referring to fig. 1, in an exemplary embodiment of the present invention, the intelligent security gate 10 includes a main gate 50, a sub gate 60, and a controller 20, and in practice, the main gate 50 and the sub gate 60 are generally disposed opposite to each other. In principle, it is also possible to use only one main door 50, omitting the described sub-door 60, and the person skilled in the art can implement it equally accordingly.
Referring to fig. 2, the controller 20 includes at least two fm antennas 25, a multiplexer 24, at least one signal generator 22, a modulator 23, an amplifying circuit 28, a receiving circuit 26, and a read/write module 21. The circuit principle of the controller 20 is as follows: the read-write module 21 drives the signal generator 22 to generate a read-write signal, the signal generator 22 outputs the read-write signal to the modulator 23, the modulator 23 modulates the read-write signal into a radio frequency signal, the modulator 23 outputs the read-write signal after modulation to the amplifying circuit 28, the amplifying circuit 28 amplifies the read-write signal in a matching manner, the amplifying circuit 28 outputs the read-write signal after amplification in a matching manner to the multiplexer 24, the multiplexer 24 outputs the read-write signal to the frequency modulation antenna 25 in a time slot, and the read-write module 21 controls a working frequency point of the frequency modulation antenna 25 to be consistent with a frequency point of the read-write signal, so that the read-write signal is radiated to a free space through the frequency modulation antenna 25.
When the radio frequency tag located in the free space receives the read-write signal, the radio frequency tag generates a response signal after being excited, the frequency modulation antenna 25 receives the response signal and outputs the response signal to the receiving circuit 26 through the multiplexer 24, and the receiving circuit 26 demodulates the response signal and outputs the demodulated response signal to the read-write module 21. The above is the basic circuit principle of the present invention, and the details are described below.
The read-write module 21 is configured to poll the driving signal generator 22 to generate different read-write signals, and the read-write module 21 is further configured to receive the response signal to obtain the tag data in the response signal and execute corresponding security detection. The read-write module 21 synchronously controls the signal generator 22, the amplifying circuit 28, the multiplexer 24 and the frequency modulation antenna 25, so that the signal generator 22 can generate read-write signals with the same working frequency point as the frequency modulation antenna 25 in one time slot.
The signal generator 22 can generate read and write signals with different frequency points. It can be implemented by a voltage-controlled oscillating circuit, and the read/write module 21 outputs different voltage signals to it to generate the read/write signals of different frequency points correspondingly.
When there are multiple signal generators 22, the multiple signal generators 22 are respectively used to generate read-write signals at different frequency points, so as to correspondingly read and write radio frequency tags at different frequency points. The read-write module 21 outputs a voltage signal to one of the signal generators 22 of the plurality of signal generators 22 each time, drives the signal generator 22 to generate a corresponding read-write signal, and the plurality of signal generators 22 are respectively used for generating read-write signals of different frequency points. Generally, the read/write signals generated by the signal generator 22 are baseband signals.
The plurality of signal generators 22 are respectively a first signal generator 221, a second signal generator 222, and a third signal generator 223, and the read/write module 21 respectively drives different signal generators 22 to generate read/write signals of different frequency points in different time slots, for example, in a first time slot, the read/write module 21 drives the first signal generator 221 to generate a first read/write signal; in the second time slot, the read-write module 21 drives the second signal generator 222 to generate a second read-write signal; in the third time slot, the read-write module 21 drives the third signal generator 223 to generate a third read-write signal; the frequency points of the first read-write signal, the second read-write signal and the third read-write signal are different.
The modulator 23 receives the read/write signal output by the signal generator 22, and modulates the read/write signal from a baseband signal to a radio frequency signal. The modulator 23 is connected in series with the plurality of signal generators 22, so that the read-write signal output by each signal generator 22 is modulated from a baseband signal to a radio frequency signal by the modulator 23. The modulator 23 sequentially receives the read/write signals output from the plurality of signal generators 22 at different time slots, and further sequentially modulates the received read/write signals.
The amplifying circuit 28 receives the read-write signal output by the modulator 23, and the amplifying circuit 28 performs matching amplification on the read-write signal to control the gain of the read-write signal. Specifically, the read/write module 21 may control the amplification performance of the amplification circuit 28 on the read/write signal, so that the amplification performance of the amplification circuit 28 matches the amplification performance preset by the read/write module 21, and the read/write signal is amplified.
The multiplexer 24 receives the read/write signal output from the amplifying circuit 28 and outputs the read/write signal to the frequency modulation antenna 25. The multiplexer 24 polls to receive or output the read-write signals and the response signals of different frequency points in different time slots in a time division duplex mode. The multiplexer 24 receives only the read-write signal and/or the corresponding response signal of one frequency point in one time slot, so that the frequency modulation antenna 25 can poll to transmit the read-write signal and/or receive the corresponding response signal of different frequency points. Specifically, the multiplexer 24 divides the fixed time into a plurality of time slots, which are a first time slot, a second time slot and a third time slot, respectively, and sets the read-write signals with different frequency points as a first read-write signal, a second read-write signal and a third read-write signal, respectively.
In the first time slot, the multiplexer 24 receives the first read-write signal and outputs the first read-write signal to the frequency modulation antenna 25; in a second time slot, the multiplexer 24 receives the second read-write signal and outputs the second read-write signal to the fm antenna 25; in a third time slot, multiplexer 24 receives the third read-write signal and outputs the third read-write signal to fm antenna 25.
In another embodiment, in the first time slot, the multiplexer 24 further receives a first response signal fed back by the radio frequency tag in response to the first read-write signal; in the second time slot, the multiplexer 24 also receives a second response signal fed back by the radio frequency tag in response to the second read-write signal; in the third time slot, the multiplexer 24 also receives a third acknowledgement signal fed back by the radio frequency tag in response to the third read-write signal.
In another embodiment, in the first time slot, the multiplexer 24 receives the first read-write signal and outputs the first read-write signal to the fm antenna 25; in the second time slot, the multiplexer 24 also receives a first response signal fed back by the radio frequency tag in response to the first read-write signal; in the third time slot, the multiplexer 24 receives the second read-write signal and outputs the second read-write signal to the fm antenna 25. Therefore, if the offset frequency of the former answer signal is larger, the latter time slot can also effectively receive the answer signal for subsequent processing.
In the exemplary embodiment of the present invention, the multiplexer 24 is controlled by the read/write module 21, and the read/write module 21 controls the multiplexer 24 to operate in different time slots to synchronously control the signal generator 22, the amplifying circuit 28 and the frequency modulation antenna 25 to operate, so that the electrical components can cooperate with each other, and the frequency point of the read/write signal generated by the control signal generator 22 in the same time slot is the same as the operating frequency point of the frequency modulation antenna 25.
The frequency modulation antenna 25 is configured to receive the read-write signal output by the multiplexer 24, radiate the received read-write signal to a free space, and receive a response signal fed back by the radio frequency tag corresponding to the read-write signal.
Because the read-write module 21 controls the signal generator 22 to generate read-write signals with different frequency points in different time slots, the frequency modulation antenna 25 transmits the read-write signals with different frequency points, and the frequency modulation antenna 25 needs to adjust the working frequency point. The read-write module 21 outputs a control signal to the fm antenna 25 to switch the operating frequency point of the fm antenna 25 between different frequency points on the same operating frequency band, that is, the read-write module 21 controls the fm antenna 25 to transmit read-write signals of different frequency points, so as to read information passing through the rf tag between the main gate 50 and the sub-gate 60. After receiving the read-write signal, the radio frequency tag is excited to feed back a response signal to the frequency modulation antenna 25.
In particular, referring to fig. 3, the frequency-modulated antenna 25 comprises an antenna element 253, a plurality of resonant circuits 252 and at least one switching circuit 251. The plurality of resonant circuits 252 are connected in series to form a resonant circuit, and a switch circuit 251 is connected in parallel to at least one resonant circuit 252 in the resonant circuit, so that the power and the resistance of the resonant circuit can be adjusted by controlling the on/off of the switch circuit 251. The antenna element 253 is also connected in series in the resonant circuit, and the working frequency point of the antenna element 253 is changed under the influence of the power and the resistance value of the resonant circuit, that is, the working frequency point of the antenna element 253 can be changed by controlling the on/off of the switch circuit 251, so that the frequency modulation antenna 25 can transmit read-write signals of different frequency points.
The read/write module 21 is electrically connected to the switch circuit 251, and the read/write module 21 outputs a control signal to the switch circuit 251 to control the on/off of the switch circuit 251 through the control signal. In some embodiments, the read/write module 21 controls the on/off of the switch circuit 251 by controlling the high/low level of the output control signal.
It can be understood that, by configuring corresponding switch circuits controlled by the read/write module 21 for the plurality of resonant circuits 252, the read/write module 21 can selectively control the on/off of one or more resonant circuits 252 to control the antenna element 253 to operate at different frequency points. Therefore, in some embodiments, the resonant circuit includes a plurality of resonant circuits 252, each resonant circuit 252 is connected in parallel with a switch circuit 251, and the read/write module 21 can change the working frequency of the antenna element 253 by controlling on/off of the plurality of switch circuits 251 connected in parallel to the resonant circuit 252, so that the frequency modulation antenna 25 has a plurality of working frequency points. The read-write module 21 synchronously controls the signal generator 22, the amplifying circuit 28, the multiplexer 24 and the frequency modulation antenna 25, so that the read-write signal frequency point is the same as the working frequency point of the frequency modulation antenna 25 in the same time slot.
Further disclosing the circuit structure of the frequency modulation antenna, as shown in fig. 3, the resonant circuit 252 is composed of a capacitor and a resistor connected in parallel, and the resistance values of the resistors of the plurality of resonant circuits 252 constituting the resonant circuit are equal to or unequal to the capacitance values of the capacitors. The antenna element 253 is a coil. The switch circuit 251 and the resonance circuit 252 have capacitors and resistors connected in parallel, and the read/write module 21 controls the on/off of the switch circuit 251 through a high/low level for outputting a control signal to the switch circuit 251.
When the switch circuit 251 is turned on, the switch circuit 251 is equivalent to a short circuit, and the resistance and the capacitance of the resonant circuit 252 connected in parallel with the switch circuit 251 do not pass current, so that the capacitance of the resonant circuit is increased, and the working frequency of the antenna oscillator 253 is reduced; when the switch circuit 251 is turned off, the resistor and the capacitor of the resonant circuit 252 connected in parallel to the switch circuit 251 are turned on, so that the capacitance of the resonant circuit is reduced, and the operating frequency of the antenna element 253 is increased. Therefore, the capacitance value in the resonant circuit is changed, and the power of the resonant circuit is further influenced, so that the working frequency point of the antenna element 253 of the coil structure is changed, and the frequency modulation antenna 25 works at different frequency points in different time slots. In general, the frequency-modulated antenna 25 of the present invention operates at a frequency between 0 and 30MHz, preferably between 9.6MHz and 13.56 MHz.
The fm antenna 25 receives a response signal fed back by the rf tag in response to the read/write signal, the response signal is output to the multiplexer 24, and after receiving the response signal, the multiplexer 24 outputs the response signal to the read/write module 21 through the receiving circuit 26.
The receiving circuit 26 is disposed between the multiplexer 24 and the read/write module 21, and the receiving circuit 26 demodulates the received response signal, so that the read/write module 21 can obtain the tag data through the demodulated read/write signal. The controller 20 comprises at least one receiving circuit 26 for demodulating the read and write signals.
In some embodiments of the present invention, the controller 20 includes a plurality of receiving circuits 26, each receiving circuit 26 corresponds to a response signal at a different frequency point, and the plurality of receiving circuits 26 correspondingly demodulate the response signals at the corresponding frequency point. By the mode, each receiving circuit 26 corresponds to the response signals of different frequency points, the receiving circuits 26 can enable the response signals to be demodulated accurately, errors are reduced, and tag data cannot be lost. Alternatively, the plurality of receiving circuits 26 may demodulate each response signal at the same time, thereby avoiding a failure of a certain receiving circuit 26 and enhancing the success rate of demodulation.
For example, the plurality of receiving circuits 26 are respectively referred to as a first receiving circuit 261, a second receiving circuit 262, and a third receiving circuit 262. In the first time slot, the first receiving circuit 261 receives the first response signal output by the multiplexer 24, demodulates the first response signal, and outputs the demodulated first response signal to the read/write module 21; in the second time slot, the second receiving circuit 262 receives the second response signal output by the multiplexer 24, demodulates the second response signal, and outputs the demodulated second response signal to the read/write module 21; in the third time slot, the third receiving circuit 263 receives the third response signal output by the multiplexer 24, demodulates the third response signal, and outputs the demodulated first read response signal to the read/write module 21; the frequency points of the first response signal, the second response signal and the third response signal are different.
The main door 50 and the auxiliary door 60 of the intelligent safety door 10 are arranged opposite to each other, and the working surfaces of the main door 50 and the auxiliary door 60 are opposite to each other. At least one frequency modulation antenna 25 is respectively arranged on the main door 50 and the auxiliary door 60, and the frequency modulation antennas 25 on the main door 50 and the auxiliary door 60 transmit reading and writing signals towards the opposite door direction. The frequency modulation antennas 25 on the main gate 50 and the sub-gate 60 are electrically connected to the same multiplexer 24, and the read-write module 21 outputs the read-write signals of the same frequency point to the frequency modulation antennas 25 on the main gate 50 and the sub-gate 60 through the multiplexer 24, so that the frequency modulation antennas 25 on the main gate 50 and the sub-gate 60 radiate the read-write signals of the same frequency point to the outside in the same time slot.
The main door 50 and the sub door 60 are respectively provided with a plurality of frequency modulation antennas 25, the plurality of frequency modulation antennas 25 on the main door 50 and the sub door 60 are respectively arranged on different heights of the main door 50 and the sub door 60, the frequency modulation antennas 25 on the main door 50 radiate reading and writing signals towards the sub door 60, and the frequency modulation antennas 25 on the sub door 60 radiate reading and writing signals towards the main door 50 so as to act on radio frequency tags on different heights. In some embodiments, referring to fig. 1, two frequency modulation antennas 25 are respectively disposed on the main door 50 and the sub door 60, and the two frequency modulation antennas 25 on the main door 50 or the sub door 60 are sequentially arranged in the height direction of the main door 50 or the sub door 60.
The multiple fm antennas 25 on the main gate 50 and/or the sub-gate 60 are electrically connected to the same multiplexer 24, and the multiplexer 24 outputs read/write signals of different frequency points to the fm antennas 25 on the main gate 50 and the sub-gate 60 in different time slots in a time division duplex manner. The plurality of frequency modulation antennas 25 on the main gate 50 and/or the auxiliary gate 60 radiate the read-write signal of the same frequency point to the outside in the same time slot so as to radiate the read-write signal to the radio frequency tag of the corresponding frequency point; in another time slot, the multiple fm antennas 25 on the main gate 50 and/or the sub-gate 60 simultaneously radiate a read/write signal of another frequency point to the outside to radiate the another read/write signal to the rf tag corresponding to the another frequency point.
For example, in a first time slot, the multiple fm antennas 25 on the main gate 50 and/or the sub-gate 60 are controlled to simultaneously radiate a first read/write signal; in a second time slot, controlling a plurality of frequency modulation antennas 25 on the main gate 50 and/or the auxiliary gate 60 to simultaneously radiate a second read-write signal; and in a third time slot, controlling the plurality of frequency modulation antennas 25 on the main gate 50 and/or the sub-gate 60 to simultaneously radiate a third read-write signal, wherein the frequency points of the first read-write signal, the second read-write signal and the third read-write signal are different.
In some embodiments, when the main gate 50 and/or the sub-gate 60 are respectively provided with a plurality of fm antennas 25, a plurality of or all the fm antennas 25 on the main gate 50 are simultaneously and electrically connected to the same power divider, a plurality of or all the fm antennas 25 on the sub-gate 60 are simultaneously connected to the same power divider, and the power dividers are connected in series to the multiplexer 24, so that the circuit layout of the controller 20 is saved, and the load of the multiplexer 24 is reduced.
In some embodiments, the intelligent security gate 10 further includes a human body sensing module, which is disposed in the main door 50 and/or the auxiliary door 60, and is configured to sense whether a person passes through or approaches the main door 50 or the auxiliary door 60 between the main door 50 and the auxiliary door 60, and when the human body sensing module detects that a person passes through or approaches the main door 50 or the auxiliary door 60 between the main door 50 and the auxiliary door 60, the human body sensing module senses and obtains a human body activity signal, and the human body sensing module outputs the human body activity signal to the read-write module 21, so as to drive the read-write module 21 to operate.
The intelligent security door 10 further comprises a control center 30, wherein the control center 30 is used for controlling the work of the read-write module 21 and acquiring and processing the tag data acquired by the read-write module 21 after receiving the response signal. The control center 30 is electrically connected or wirelessly connected with the read/write module 21.
The control center 30 controls the read-write module 21 to work; the read-write module 21 synchronously controls the signal generator 22, the amplifying circuit 28, the multiplexer 24 and the frequency modulation antenna 25 to work according to a predetermined polling mode, so that the plurality of frequency modulation antennas 25 on the main gate 50 and/or the sub-gate 60 externally radiate read-write signals of the same frequency point in the same time slot, and externally radiate read-write signals of another frequency point in another time slot.
The control center 30 has a database in which tag data of the radio frequency tag applied to the present intelligent security gate 10 is prestored. The tag data includes information that has an associated item or person in addition to information for read-write signal verification. For example, when the tag data is associated with a commodity, the tag data also includes information such as the name, price, and date of production of the commodity; when the tag information is related to a person, the tag data also contains information such as the performance, age, sex, job title, authority, and photograph of the person.
In one embodiment, the control center 30 performs matching verification on the received tag data and the pre-stored tag information in the database, and outputs alarm information when the relevant tag information cannot be matched. The embodiment can be applied to personnel security detection, such as library entrance authentication, exhibition hall entrance authentication, conference entrance authentication, company entrance authentication and other environments, so as to verify whether the tag data fed back by the radio frequency tag carried or worn by the people passing through the main door 50 and the auxiliary door 60 is prestored in the database, and when the tag data is prestored in the database, the tag data has the passing right; when the label data is not prestored in the database, the label data represents that the label data does not have the passing authority.
In another embodiment, the control center 30 detects whether the received tag data contains a specific identifier, and outputs an alarm message when the tag data contains/does not contain the specific identifier. The embodiment can be applied to the detection of whether the commodities are purchased or not at the outlet of the supermarket, and after the user finishes payment of the commodities purchased at the supermarket, the vending equipment writes or eliminates the specific identification on the radio frequency tag of the commodities to indicate that the commodities are purchased. When a customer passes between the main door 50 and the auxiliary door 60 with a commodity, the specific identification is detected whether the label data contains the specific identification, and if the specific identification does not contain the specific identification, the alarm information is output to indicate that a certain commodity is unpaid.
The control center 30 may also be in wired or wireless communication connection with the external device 40, and the control center 30 uploads the tag data acquired through the intelligent security door 10 to the external device 40 or receives control data issued by the external device 40.
The intelligent security door 10 further comprises an alarm module, and when the alarm module receives the alarm information, the alarm module gives an alarm in the form of sound and/or light and/or screen display. The alarm module comprises a loudspeaker and/or an LED warning lamp and/or a display screen.
The invention also provides an intelligent safety door system, referring to fig. 1 and fig. 2, the intelligent safety door system comprises a plurality of sets of intelligent safety doors 10, a plurality of controllers 20 of the plurality of sets of intelligent safety doors 10 cooperate with each other to form a controller system, and the controller system is used for controlling the plurality of sets of intelligent safety doors.
The controller system of the intelligent safety door system shares the read-write module 21, the signal generator 22, the control center 30, the modulator 23 and the amplifying circuit 28. The plurality of controllers 20 of the controller system each correspond to one multiplexer 24, that is, the controller system includes a plurality of multiplexers 24, the read/write module 21 is electrically connected to the plurality of multiplexers 24 to control the operation of the plurality of multiplexers 24, and the plurality of multiplexers 24 are respectively connected in series to at least one frequency modulation antenna 25.
In the controller system of the present invention, the read-write module 21 can control a plurality of or all multiplexers 24 to pass through the read-write signals of the same frequency point in the same time slot, so as to output corresponding read-write signals to the frequency modulation antennas 25 corresponding to the plurality of or all multiplexers 24.
The circuit setting mode of the multiplexers is as follows: one of the multiplexers is used as a main multiplexer, the main multiplexer is connected with the signal generating device in series, the other multiplexers (auxiliary multiplexers) are respectively connected with the main multiplexer in series, the main multiplexer respectively outputs read-write signals received from the signal generating device to the auxiliary multiplexers and the corresponding frequency modulation antennas 25, and the auxiliary multiplexers output the received read-write signals to the corresponding frequency modulation antennas 25. And after receiving the response signal, the fm antennas 25 corresponding to all multiplexers output the response signal to the corresponding multiplexer, and after receiving the response signal, the sub-multiplexer outputs the response signal to the main multiplexer, and outputs the response signal to the receiving circuit 26 through the main multiplexer, except for the main multiplexer.
In some embodiments, a multiplexer control unit 27 is disposed between the sub-multiplexer and the read/write module 21 to cooperate with the read/write module 21 to control the operation of the corresponding multiplexer 24.
In an exemplary embodiment of the present invention, the plurality of multiplexers are a first multiplexer 241, a second multiplexer 242, and a third multiplexer 243. The first multiplexer 241 is connected in series with the signal generating device, the second multiplexer 242 and the third multiplexer 243 are not connected in series with the signal generating device, the three multiplexers are all electrically connected with the read/write module 21, the read/write module 21 controls the three multiplexers to work, the three multiplexers are respectively connected in series with at least one frequency modulation antenna 25, and the first multiplexer 241 is also respectively connected in series with the second multiplexer 242 and the third multiplexer 243.
In a time slot, the signal generating device outputs a read-write signal to the first multiplexer 241, the first multiplexer 241 is controlled by the read-write module 21 to output the read-write signal to the second multiplexer 242 and the third multiplexer 243 respectively, and the read-write module 21 controls all the three multiplexers to pass the read-write signal, so that all the three multiplexers output the read-write signal to the corresponding fm antenna 25.
In another time slot, the signal generating device outputs a read-write signal to the first multiplexer 241, the first multiplexer 241 is controlled by the read-write module 21 to output the read-write signal to the second multiplexer 242 and the third multiplexer 243, respectively, but the read-write module 21 only controls the first multiplexer 241 and the third multiplexer 243 to pass the read-write signal, and the second multiplexer 242 does not pass the read-write signal, so that the first multiplexer 241 and the third multiplexer 243 output the read-write signal to the corresponding fm antenna 25 after receiving the read-write signal.
In one embodiment, the first multiplexer 241 outputs read/write signals to only two electrical elements simultaneously in one time slot. For example, the first multiplexer 241 outputs read/write signals only to the corresponding fm antenna 25 and the second multiplexer 242, or the first multiplexer 241 outputs read/write signals only to the second multiplexer 242 and the third multiplexer 243.
The controller system of the invention can control whether the corresponding frequency modulation antenna 25 transmits the read-write signal or not by controlling whether the read-write signal passes through the plurality of multiplexers or not. The above embodiments are only some of the embodiments of the multiplexers of the controller system of the present invention, and those skilled in the art can flexibly and flexibly use the above embodiments based on the above embodiments, which is not exhaustive.
Therefore, the multiplexers 24 corresponding to the multiple groups of intelligent safety doors 10 of the intelligent safety door system are arranged in a cascade mode to form a controller system, the controllers of the multiple groups of intelligent safety doors 10 are synchronously controlled through the controller system, control levels are reduced, control efficiency is improved, and circuit layout is reduced.
The intelligent safety door system can synchronously control a plurality of frequency modulation antennas 25 on a plurality of groups of intelligent safety doors 10 to externally radiate read-write signals of the same frequency point in the same time slot; and in another time slot, synchronously controlling a plurality of frequency modulation antennas 25 on a plurality of groups of intelligent security doors 10 to externally radiate another read-write signal so as to realize polling of the read-write signals externally radiating different frequency points and receiving corresponding response signals.
The invention also provides an intelligent security door detection method, which is implemented based on the intelligent security door, and referring to fig. 4, the intelligent security door detection method comprises the following steps:
s10, the drive read-write module polls the frequency modulation antenna in the main gate and the auxiliary gate with different time slots to send read-write signals of different frequency points on the same working frequency band:
in the same time slot, the read-write module controls the signal generator to generate read-write signals, the signal generator outputs the read-write signals to the modulator, the modulator modulates the read-write signals from baseband signals into radio-frequency signals, the modulator outputs the read-write signals after modulation to the amplifying circuit, the read-write signals are subjected to matched amplification through the amplifying circuit, the amplifying circuit outputs the read-write signals to the multiplexer, the multiplexer outputs the read-write signals to a plurality of or all frequency modulation antennas in the main gate and/or the auxiliary gate, and the read-write signals are radiated outwards through the frequency modulation antennas. In the circuit flow, the read-write module synchronously controls the signal generator, the amplifying circuit, the multiplexer and the frequency modulation antenna, so that the electrical components work on the same frequency point.
In another time slot, the above steps are repeated, but the frequency point of each read-write signal and the working frequency point of each electrical element are different from the frequency point of the last time slot. Therefore, the read-write module is driven to poll a plurality of or all frequency modulation antennas of the main door and the auxiliary door at different time slots to generate read-write signals of different frequency points on the same working frequency band. And sequentially generating read-write signals of corresponding frequency points to the radio frequency tags of different frequency points.
Based on the description above, in each time slot, in order to control the frequency modulation antenna to work at different frequency points to transmit read-write signals of different frequency points, the switching circuit is arranged on the frequency modulation antenna, and the on/off of the switching circuit is controlled, so as to control the working frequency points of the frequency modulation antenna. The specific circuit structure can be referred to the above description about the intelligent security door.
S20, receiving a plurality of response signals responding to the read/write signals via the frequency modulation antenna, and analyzing the plurality of response signals by the read/write module to obtain corresponding unique tag data:
and after the radio frequency tag receives the read-write signal output by the frequency modulation antenna, the radio frequency tag is excited to feed back a response signal to the frequency modulation antenna. After the frequency modulation antenna receives the response signal, the frequency modulation antenna outputs the response signal to the read-write module through the multiplexer and the receiving circuit, and the receiving circuit demodulates the response signal so that the read-write module can obtain unique tag data in the response signal.
S30, carrying out validity verification according to the label data, and outputting alarm information when the illegal label data is verified:
the read-write module outputs the received label data to the control center, the control center performs matching verification on the received label data and label information prestored in a database of the control center, and when the relevant label information cannot be matched, alarm information is output.
In another embodiment, the read-write module outputs the received tag data to the control center, and the control center receives and detects whether each tag data contains a specific identifier, and outputs alarm information when the tag data contains/does not contain the specific identifier. The specific identifier may be a check code in the tag data or a random number in the data string, etc.
The intelligent safety door detection method also comprises a preposing step of detecting a human activity signal between the main door and the auxiliary door, driving the read-write module to work when the human activity signal is detected to exist, and executing the step S20.
In summary, the multiple frequency modulation antennas of the intelligent security gate of the present invention simultaneously radiate the read/write signal of the same frequency point in the same time slot, and simultaneously radiate the read/write signal of another frequency point in another time slot. When the radio frequency tag is biased, the intelligent safety door can transmit read-write signals of different frequency points through polling, and the problem of frequency bias of the radio frequency tag is solved.
The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention according to the present invention is not limited to the specific combination of the above-mentioned features, but also encompasses other embodiments in which any combination of the above-mentioned features or their equivalents is possible without departing from the scope of the invention as defined by the appended claims. For example, the above features and (but not limited to) features having similar functions of the present invention are mutually replaced to form the technical solution.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims (14)
1. The utility model provides an intelligent security door, includes relative main door, vice door and the controller that sets up, its characterized in that:
the controller comprises at least two frequency modulation antennas, a multiplexer and a read-write module;
the main door and the auxiliary door are at least provided with one frequency modulation antenna, and the two frequency modulation antennas are controlled to switch working frequency points between different frequency points on the same working frequency band and are used for transmitting read-write signals to the opposite door and receiving corresponding response signals;
the multiplexer is used for controlling the read-write signal and the response signal to pass through in a time division duplex mode;
the read-write module is used for polling and controlling the multiplexer to pass through the read-write signals of different frequency points in different time slots, synchronously controlling the frequency modulation antenna to be switched to a corresponding frequency point to transmit a corresponding read-write signal, and analyzing the response signal into label data to be output.
2. The intelligent security door of claim 1, wherein a plurality of frequency modulation antennas are provided on the main door and/or the sub-door, and the plurality of frequency modulation antennas on each door are respectively located at different height positions.
3. The intelligent security gate of claim 2, wherein the plurality of frequency modulation antennas on the primary gate and/or the secondary gate are connected in parallel to the same multiplexer.
4. The intelligent security door of claim 2, wherein all frequency modulation antennas on the main door and/or the auxiliary door are synchronously controlled by the read-write module and operate at the same frequency point in the same time slot.
5. The intelligent security door of claim 1, further comprising a control center, wherein the control center receives the tag data to perform matching verification with the tag information prestored in the database, and outputs alarm information when the relevant tag information cannot be matched;
or, the intelligent security gate further comprises a control center, wherein the control center receives the tag data, detects whether each tag data contains a specific identifier, and outputs alarm information when the tag data contains/does not contain the specific identifier.
6. The intelligent safety door according to claim 1, further comprising a human body induction module, wherein the human body induction module is disposed in the main door and/or the auxiliary door, and is configured to induce and acquire a human body activity signal to drive the read-write module to work.
7. The intelligent security gate of claim 1, wherein the frequency-modulated antenna comprises:
the antenna oscillator is used for transmitting a read-write signal or receiving a response signal;
a plurality of resonant circuits forming a resonant circuit with the antenna element;
at least one of the resonant circuits is connected in parallel with a switch circuit, and the switch circuit is controlled by the high/low level of the control signal output by the read-write module to correspondingly switch on/off the resonant circuit controlled by the switch circuit so as to switch the working frequency point of the antenna oscillator.
8. The intelligent security gate of claim 1, wherein the controller further comprises signal generators for generating the signals of the different frequency points, respectively, each signal generator generating a read-write signal corresponding to a different frequency point in response to a corresponding different voltage signal output by the read-write module.
9. The intelligent security gate of claim 8, wherein the controller further comprises a modulator and an amplifying circuit, the modulator is connected in series with one or more signal generators to modulate the read-write signals generated by the generators into radio frequency signals, and the amplifying circuit is connected in series with the modulator to match and amplify the radio frequency signals and output the radio frequency signals to the multiplexer.
10. The intelligent security gate of claim 1, wherein the controller further comprises at least one receiving circuit, the receiving circuit is connected in series with the multiplexer and the read-write module, and is configured to parse and output the response signal received by the multiplexer to the read-write module.
11. The intelligent safety door detection method is characterized by comprising the following steps:
the drive read-write module transmits read-write signals of different frequency points on the same working frequency band to the frequency modulation antennas in the main door and the auxiliary door in a polling mode in different time slots;
receiving a plurality of response signals responding to the read-write signals through the frequency modulation antenna, and analyzing the plurality of response signals by a read-write module to obtain corresponding unique tag data;
and carrying out validity verification according to the tag data, and outputting alarm information when illegal tag data is verified.
12. The intelligent security door detection method according to claim 11, further comprising the pre-step of: and detecting a human body activity signal between the main door and the auxiliary door, and executing the subsequent steps after detecting that the human body activity signal exists.
13. The intelligent security gate detecting method according to claim 11, wherein in the step of performing validity verification based on the tag data and outputting alarm information when illegal tag data is verified,: the control center receives the label data and label information prestored in the database to carry out matching verification, and outputs alarm information when the relevant label information cannot be matched;
or the control center receives the tag data, detects whether each tag data contains a specific identifier, and outputs alarm information when the tag data contains/does not contain the specific identifier.
And updating the use times of the label data by using the unique label data acquired by the read-write module.
14. The intelligent security gate detection method according to claim 11, wherein in the step of sending the read-write signals of different frequency points on the same operating frequency band to the frequency modulation antennas of the main gate and/or the sub-gate by polling in different time slots by the drive read-write module, the read-write module outputs a control signal to synchronously control on/off of one or more tuning circuits in each frequency modulation antenna, so as to adjust the operating frequency point of the frequency modulation antenna.
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