CN114280084A - Airport security inspection auxiliary method based on radio frequency signals - Google Patents
Airport security inspection auxiliary method based on radio frequency signals Download PDFInfo
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- CN114280084A CN114280084A CN202111591469.3A CN202111591469A CN114280084A CN 114280084 A CN114280084 A CN 114280084A CN 202111591469 A CN202111591469 A CN 202111591469A CN 114280084 A CN114280084 A CN 114280084A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention provides an airport security check auxiliary method based on radio frequency signals, which comprises the following steps: arranging a signal receiver at the bottom of a security check basket, arranging a signal transmitter above an airport security check conveyor belt, and arranging the security check basket on the airport security check conveyor belt; the signal transmitter transmits a signal to the signal receiver, and the signal receiver receives the signal and backscatters the signal; when the passenger puts the personal luggage into the airport security check basket without suspected dangerous goods such as liquid, metal and the like and suspected drugs such as powder, tablets and the like, all the grids of the warning display of the signal transmitter are displayed as green, which indicates that the articles in the security check basket are safe and do not need to be further manually checked; when dangerous goods appear in the security check basket, red grids appear in a warning display of the signal transmitter, and the fact that the passenger goods in the security check basket have suspected dangerous goods is indicated to require further inspection by security check personnel. The invention can effectively assist airport security personnel to carry out security check, and the equipment is arranged in front of the X-ray machine, thereby meeting the application requirement of reducing the workload.
Description
Technical Field
The invention relates to the technical field of application of the Internet of things, in particular to an airport security inspection auxiliary method based on radio frequency signals.
Background
With the continuous development of the internet of things technology, more and more simple repeated operations can be replaced by machines, so that the burden of operators is reduced, and the working efficiency is improved. For example: in the airport security check process, most of the existing imaging modes are X-rays, the danger of objects needs to be observed manually through images, a large amount of manpower and material resources are consumed, and if the dangerous objects are not observed due to negligence of workers, the potential safety hazard of flights is possibly caused, so that the working pressure of the workers is increased due to the requirement of zero-error security check, the psychological burden is increased, the energy is consumed very much, and the risk of omission is increased.
Therefore, the invention provides an airport security inspection auxiliary method based on radio frequency signals, which is beneficial to improving the accuracy of security inspection.
Disclosure of Invention
In order to solve the problems, the invention provides an airport security inspection auxiliary method based on radio frequency signals, which can effectively assist airport security inspection personnel to carry out security inspection, and the application requirement of workload is reduced by placing the equipment in front of an X-ray machine.
In order to achieve the above purpose, the present invention provides the following technical solutions.
An airport security inspection auxiliary method based on radio frequency signals comprises the following steps:
a plurality of signal receivers are uniformly arranged at the bottom of the security check basket, and a signal transmitter is arranged on a support of the airport security check conveyor belt; when the security check basket reaches the lower part of the bracket, the signal receiver receives the signal transmitted by the signal transmitter and backscatters the signal;
when no article is in the security check basket, each backscatter signal received by the signal transmitter is set as an initial value matrix R0；
After articles are put in the security check basket, each backscatter signal received by the signal transmitter is set as a numerical matrix Rx(ii) a Recording as a set default value when the backscatter signal cannot be received;
according to an initial value matrix R0Sum value matrix RxObtaining a matrix of values Ry(ii) a Will matrix RyAll elements in the matrix are used for solving the absolute value to obtain a matrix Rz；
Will matrix RzCalculating standard deviation S of all elements in the product, determining a threshold Q, and if the standard deviation is smaller than the threshold Q, undoubtedly determining that the product is similar to a dangerous product; if the standard deviation is larger than the threshold Q, the following processing is carried out:
matrix R is solvedzThe maximum value b of all the elements in the system is calculated to obtain a numerical matrix RzThe mean value a of the elements after the maximum value b is removed, and a numerical value matrix RzAll elements in (a) are compared to the mean value a;
matrix R of valueszAll the elements in the array are processed into 0 and 1, and the numerical matrix R is processedzThe elements in the matrix which are more than or equal to a are marked as 1, the elements which are less than a are marked as 0, and a numerical matrix M is obtainedx；
When the value matrix MxWhen all the elements in (1) are 0, no further check is needed, and when the number of the elements in (1) is 1, the corresponding positions of the elements need to be further checked.
Preferably, a warning display is also included; the positions of the grids displayed in the warning display are displayed according to the actual positions of the signal receivers, and the number of the grids depends on the number of the actually deployed signal receivers;
wherein, when the matrix MxWhen all the medium elements are 0, or the matrix RzWhen the standard deviation S of the elements is less than the threshold value Q, the warning display displays green completely, and when the matrix M isxWhen the element 1 appears, the suspected dangerous goods exist in the security check basket, the warning display can display a red grid, red alarm is carried out, and the position where the red grid appears needs to be further checked.
Preferably, the default value recorded as set when no backscatter signal is received is-70 dB.
The invention has the beneficial effects that:
the airport security inspection auxiliary method based on the radio frequency signals utilizes different media to influence the transmission characteristics of the radio frequency signals, signal receivers are uniformly arranged in airport security inspection baskets, and when no suspected dangerous goods such as liquid, metal and the like and suspected drugs such as powder, tablets and the like exist in the security inspection baskets, a numerical matrix M is adoptedxThe elements are all 0, and when suspected dangerous goods such as liquid, metal and the like and suspected drugs such as powder, tablets and the like exist in the security check basket, the numerical momentMatrix MxThe existence element 1 indicates that the articles suspected of dangerous goods exist in the security check basket, the warning display can give a red lattice warning to remind security check personnel to further check, and the method is overall accurate and stable, can effectively monitor the existence of dangerous goods, and reduces the application requirement of workload.
Drawings
FIG. 1 is a schematic diagram of the overall structure and experimental procedure of an embodiment of the present invention;
FIG. 2 is a graph showing the results of an experiment according to an embodiment of the present invention.
In the figure, 1-a security check basket, 2-a signal receiver, 3-a security check equipment conveyor belt, 4-a signal transmitter, 5-a bracket and 41-a warning display.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The invention relates to an airport security check auxiliary method based on radio frequency signals, which specifically comprises the following steps as shown in figure 1:
s1: a plurality of signal receivers 2 are uniformly arranged at the bottom of the security check basket 1, and the signal receivers 2 are fixed at the bottom of the security check basket 1 by workers or fixed at the bottom of the security check basket 1 by security check basket manufacturers in the processing process; a signal emitter 4 is arranged on a bracket 5 of the airport security check conveyor belt 3;
s2: the signal emitter 4 emits signals to the signal receiver 2, due to the influence of different media on electromagnetic waves, the value of the backscattered signals acquired by the signal emitter 4 and received by the signal receiver 2 changes, the signal receiver 2 receives the signals and backscatters the signals along with the placement of articles in the security check basket 1, the signal emitter 4 receives the backscattering signals, and the value is-70 dB of a default value when the signal receiver 2 cannot receive the signals from the signal emitter 2;
s3: when no articles are in the security check basket 1, the signal emitter 4 receives each backscatter signalNumber set to initial value matrix R0。
S4: after articles are put into the security check basket 1, each backscatter signal received by the signal emitter 4 changes and is set as a numerical matrix Rx. S5: according to an initial value matrix R0Sum value matrix RxObtaining a matrix of values Ry(ii) a Calculating absolute values of all elements in the matrix Ry to obtain a matrix Rz(ii) a Will matrix RzCalculating standard deviation S of all elements in the product, determining a threshold Q, and if the standard deviation is smaller than the threshold Q, undoubtedly determining that the product is similar to a dangerous product; if the standard deviation is larger than the threshold Q, the following processing is performed.
S6 matrix R is solvedzThe maximum value b of all the elements in the matrix is calculated to obtain the mean value a of the residual elements in the numerical matrix Rz after the maximum value b is removed, and the numerical matrix R is usedzAll elements in (a) are compared to the mean value a;
s7: matrix R of valueszAll the elements in the array are processed into 0 and 1, and the numerical matrix R is processedzThe elements in the matrix which are more than or equal to a are marked as 1, the elements which are less than a are marked as 0, and a numerical matrix M is obtainedx；
When the value matrix MxWhen all the elements in (1) are 0, no further check is needed, and when the number of the elements in (1) is 1, the corresponding positions of the elements need to be further checked.
Further, a warning display 41 is also included; the positions of the grids displayed in the warning display 41 are displayed according to the actual positions of the signal receivers 2, and the number of the grids depends on the number of the actually deployed signal receivers 2; wherein, when the matrix MxWhen all the medium elements are 0, or the matrix RzWhen the standard deviation S of the elements is less than the threshold Q, the warning display 41 displays green color, and when the matrix M isxWhen element 1 appears, the suspected dangerous goods exist in the security check basket 1, the warning display 41 will appear a red grid, a red alarm is given, and the position where the red grid appears needs to be further checked.
The specific embodiment is as follows:
in an actual test, spray, paper towels, alcohol, 150ml of makeup removing oil and fruit knives are respectively placed at the position 1, the position 3, the position 4, the position 8 and the position 9 of the labels, and through experiments, the energy values of the labels at the position 1, the position 4, the position 8 and the position 9 are found to be obviously fluctuated, thereby proving that suspected boarding contraband exists; and because the position 3 is provided with the common paper extraction, the energy value fluctuation is small because of no danger, and the method is proved to be capable of well distinguishing dangerous articles. The specific experimental result is shown in fig. 2, and the calculation process is as follows:
the energy value of the tag measured when there is no article in the security check basket is as follows:
energy values measured with spray, paper towel, alcohol, 150ml of make-up remover and fruit knife placed at the position 1, position 3, position 4, position 8 and position 9 labels respectively:
initial value matrix R0Sum value matrix RxObtaining a matrix of values:
will matrix RyThe absolute value of all the elements in the list is calculated to obtain a matrix:
matrix R is solvedzThe maximum value b of all the elements in the matrix is 36.5, and the numerical matrix R is obtained through calculationzThe average value a of the elements after the maximum value b is removed is 13.75, and the numerical matrix R is formedzAll elements in (a) are compared to the mean value a;
matrix R of valueszAll the elements in the array are processed into 0 and 1, and the numerical matrix R is processedzThe elements in (1) greater than or equal to a are marked as 1, the elements less than a are marked as 0, and a numerical matrix is obtained:
the specific type of the electronic component in this embodiment is not specially specified, and any commercially available ordinary product may be used as long as the usage requirement of the present invention is satisfied, and the number and the positions of the lattices of the warning display are determined according to the actual number and the positions of the signal receivers, and may be adjusted according to the actual situation.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. An airport security check auxiliary method based on radio frequency signals is characterized by comprising the following steps:
a plurality of signal receivers (2) are uniformly arranged at the bottom of the security check basket (1), and a signal transmitter (4) is arranged on a bracket (5) of the airport security check conveyor belt (3); when the security check basket (1) arrives below the bracket (5), the signal receiver (2) receives the signal transmitted by the signal transmitter (4) and backscatters the signal;
when the security check basket (1) is not provided with any articles, the signal emitter (4) receives each backscatter signal and sets the backscatter signal as an initial value matrix R0；
After articles are put into the security check basket (1), each backscatter signal received by the signal transmitter (4) is set as a numerical matrix Rx(ii) a Recording as a set default value when the backscatter signal cannot be received;
according to an initial value matrix R0Sum value matrix RxObtaining a matrix of values Ry(ii) a Will matrix RyAll elements in the matrix are used for solving the absolute value to obtain a matrix Rz；
Will matrix RzCalculating standard deviation S of all elements in the product, determining a threshold Q, and if the standard deviation is smaller than the threshold Q, undoubtedly determining that the product is similar to a dangerous product; if the standard deviation is larger than the threshold Q, the following processing is carried out:
matrix R is solvedzThe maximum value b of all the elements in the system is calculated to obtain a numerical matrix RzThe mean value a of the remaining elements after the maximum value b is removed, and a value matrix RzAll elements in (a) are compared to the mean value a;
matrix R of valueszAll the elements in the array are processed into 0 and 1, and the numerical matrix R is processedzThe elements in the matrix which are more than or equal to a are marked as 1, the elements which are less than a are marked as 0, and a numerical matrix M is obtainedx；
When the value matrix MxWhen all the elements in (1) are 0, no further check is needed, and when the number of the elements in (1) is 1, the corresponding positions of the elements need to be further checked.
2. The radio frequency signal-based airport security inspection assistance method of claim 1, further comprising an alert display (41); the positions of the grids displayed in the warning display (41) are displayed according to the actual positions of the signal receivers (2), and the number of the grids depends on the number of the actually deployed signal receivers (2);
wherein, when the matrix MxWhen all the medium elements are 0, or the matrix RzWhen the standard deviation S of the elements is less than the threshold Q, the warning display (41) displays green color, and when the matrix M isxWhen the element 1 appears, the suspected dangerous goods exist in the security check basket (1), the warning display (41) can display a red grid, a red alarm is given, and the position where the red grid appears needs to be further checked.
3. The method of claim 1, wherein the default value set for the failure to receive a backscatter signal is-70 dB.
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