CN111798671B - Method for improving detection accuracy of parking space sensor through feedback of nearby units - Google Patents
Method for improving detection accuracy of parking space sensor through feedback of nearby units Download PDFInfo
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- CN111798671B CN111798671B CN202010933012.5A CN202010933012A CN111798671B CN 111798671 B CN111798671 B CN 111798671B CN 202010933012 A CN202010933012 A CN 202010933012A CN 111798671 B CN111798671 B CN 111798671B
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- G08—SIGNALLING
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- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
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- G08G1/00—Traffic control systems for road vehicles
- G08G1/14—Traffic control systems for road vehicles indicating individual free spaces in parking areas
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Abstract
The invention provides a method for improving the detection accuracy of a parking space sensor through the feedback of a nearby unit, which is applied to a server and comprises the following steps: step S11: receiving a first magnetic force change detected by a first sensor; step S12: when the first magnetic force change is larger than a preset magnetic force change value, sequentially inquiring a plurality of second sensors in the association group of the first sensor to obtain a plurality of second magnetic force changes; step S13: verifying the first magnetic force change based on the plurality of second magnetic force changes, and outputting a parking state detection instruction to the first sensor when the verification is passed; and when the verification fails, sending a standby instruction to the first sensor. According to the method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units, the magnetic field change caused by environmental factors is eliminated through the magnetic field change detected by the adjacent sensors, and the detection accuracy of the parking space sensor is further improved.
Description
Technical Field
The invention relates to the technical field of parking space sensors, in particular to a method for improving the detection accuracy of a parking space sensor through feedback of nearby units.
Background
Currently, a parking state detection system based on a magnetic field sensor is usually designed to install one sensor in each parking space. Each inductor works independently, and the change state of the magnetic field is monitored in real time, so that whether the parking space is occupied or not is judged. And transmitting the judgment result to the server through the local area gateway or the mobile network. This conventional design is relatively simple and easy to implement. Parking detection devices based on magnetic field sensors are often subject to interference from the surrounding environment and make false determinations. Because the magnetic force change detected by the magnetic field sensor can be caused not only by the entrance and exit of vehicles, but also by interference factors such as underground or aerial electric fields, underground subway systems and the like. These interference factors make the sensor indistinguishable whether the magnetic force changes are caused by vehicle ingress and egress or the ambient magnetic field is disturbed.
Disclosure of Invention
One of the purposes of the invention is to provide a method for improving the detection accuracy of a parking space sensor through feedback of a nearby unit, and the magnetic field change caused by environmental factors is eliminated through the magnetic field change detected by adjacent sensors, so that the detection accuracy of the parking space sensor is improved.
The method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units, which is provided by the embodiment of the invention, is applied to a server and comprises the following steps:
step S11: receiving a first magnetic force change detected by a first sensor;
step S12: when the first magnetic force change is larger than a preset magnetic force change value, sequentially inquiring a plurality of second sensors in the association group of the first sensor to obtain a plurality of second magnetic force changes;
step S13: verifying the first magnetic force change based on the plurality of second magnetic force changes, and outputting a parking state detection instruction to the first sensor when the verification is passed; and when the verification fails, sending a standby instruction to the first sensor.
Preferably, the method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units further comprises the following steps:
step S01A: acquiring a set first position of a first sensor;
step S02A: taking the parking space sensor which is within a preset range from the first position as a second sensor to be associated with the first sensor to form an associated group; the second sensors in the associated group are arranged from near to far according to the distance from the first sensor.
Preferably, the method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units further comprises the following steps:
step S01B: acquiring historical magnetic force change data detected by all parking space sensors in a parking lot;
step S02B: analyzing historical magnetic force change data; acquiring linkage data which accords with a preset first rule;
step S03B: and associating the parking space induction corresponding to the linkage data to form an associated group.
Preferably, the first rule comprises:
and the historical magnetic force change data does not have parking space sensors with undetected magnetic force changes in the same preset time period threshold and/or in the region formed by the positions of the parking space sensors corresponding to the historical magnetic force change data and/or the historical magnetic force change data is not in the threshold range set for parking detection.
Preferably, the verifying the first magnetic force variation based on the plurality of second magnetic force variations includes:
when the number of the second magnetic force changes larger than the preset magnetic force change value is larger than the preset number;
and/or the presence of a gas in the gas,
when the parking space sensor which does not detect the magnetic force change exists in the closed area formed by the position of the second sensor corresponding to the second magnetic force change and the position of the first sensor;
and/or the presence of a gas in the gas,
when the difference value between the second magnetic force change and the first magnetic force change is smaller than a preset change difference value;
the verification is determined to be failed.
The invention also provides a method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units, which is applied to the first sensor and comprises the following steps:
when the first magnetic force change is detected to be larger than a preset magnetic force change value, calling a preset association group;
sequentially sending queries to second sensors in the associated group;
receiving feedback from the second sensor for the query; the feedback comprises a second magnetic force change detected by the second sensor;
verifying the first magnetic force variation based on the second magnetic force variation; when the verification is passed, entering parking state detection; and entering a standby mode when the verification is not passed.
Preferably, the verifying the first magnetic force variation based on the plurality of second magnetic force variations includes:
when the number of the second magnetic force changes larger than the preset magnetic force change value is larger than the preset number;
and/or the presence of a gas in the gas,
when the position of the second sensor corresponding to the second magnetic force change and the position of the first sensor form a closed area, the parking space sensor which does not detect the magnetic force change does not exist;
and/or the presence of a gas in the gas,
when the difference value between the second magnetic force change and the first magnetic force change is smaller than a preset change difference value;
the verification is determined to be failed.
Preferably, the verifying the first magnetic force variation based on the plurality of second magnetic force variations includes:
extracting a plurality of characteristic values of the second magnetic force change, and bringing the characteristic values into a pre-established verification model for verification; or, a parking judgment library is established according to the historical magnetic force change data of the parking space sensors of the associated groups and the corresponding verification conditions, a judgment matrix is formed according to the magnetic force change data of each parking space sensor in the parking judgment library, and the expression of the judgment matrix is as follows:
wherein the content of the first and second substances,
is as follows
The first in the bar history magnetic force variation data
The magnetic force variation value detected by each parking space sensor;
establishing a mapping matrix of the judgment matrix according to the corresponding verification condition, wherein the expression of the mapping matrix is as follows:
wherein the content of the first and second substances,
is as follows
Verifying the condition corresponding to the first inductor corresponding to the historical magnetic force change data;
after the judgment matrix is constructed, according to the missing condition of the magnetic force variation value in the judgment matrix, executing deletion operation and value supplement operation on corresponding index data, and specifically comprising:
when the magnetic force change values exceeding a first preset number in one piece of historical magnetic force change data are missing, and/or the positions of the parking space sensors corresponding to the missing magnetic force change values are adjacent, and the missing number exceeds a second preset number; deleting the historical magnetic force change data, otherwise, executing a value supplementing operation;
the value complementing operation is realized by adopting the following formula:
wherein the content of the first and second substances,
to judge the first in the matrix
Line of
The missing magnetic force variation value of the column,
to judge the first in the matrix
Line of
The non-missing magnetic force variation value of the column;
constructing a judgment vector based on the plurality of second magnetic force changes and the first magnetic force changes which are obtained currently, wherein the judgment vector is as follows:
calculating the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, wherein the calculation formula is as follows:
wherein the content of the first and second substances,
is the first in the judgment vector and judgment matrix
Similarity between the bar historical magnetic change data;
to judge the second in the vector
A value of an element;
is as follows
The first in the bar history magnetic force variation data
A plurality of;
and determining the historical magnetic force change data corresponding to the maximum similarity according to the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, and acquiring the verification condition corresponding to the determined historical magnetic force change data from the mapping matrix.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a method for improving the detection accuracy of a parking space sensor through feedback of a nearby unit in an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The embodiment of the invention provides a method for improving the detection accuracy of a parking space sensor through the feedback of a nearby unit, as shown in fig. 1, which is applied to a server and comprises the following steps:
step S11: receiving a first magnetic force change detected by a first sensor;
step S12: when the first magnetic force change is larger than a preset magnetic force change value, sequentially inquiring a plurality of second sensors in the association group of the first sensor to obtain a plurality of second magnetic force changes;
step S13: verifying the first magnetic force change based on the plurality of second magnetic force changes, and outputting a parking state detection instruction to the first sensor when the verification is passed; and when the verification fails, sending a standby instruction to the first sensor.
The working principle and the beneficial effects of the technical scheme are as follows:
receiving a first magnetic force change detected by a first sensor; when the first magnetic force change is larger than a preset magnetic force change value, sequentially inquiring a plurality of second sensors in the association group of the first sensor to obtain a plurality of second magnetic force changes; verifying the first magnetic force change based on the plurality of second magnetic force changes, and outputting a parking state detection instruction to the first sensor when the verification is passed; and when the verification fails, sending a standby instruction to the first sensor. For example: sensor a detects the change in magnetic force and sends a message to the server asking the server if it is not caused by an environmental change. The server now looks to a whether there are several other sensors in the same group as a that also detected a change in magnetic force. If the plurality of sensors simultaneously detect the change in the magnetic force within a predetermined time period threshold, it is basically determined that the change is caused by the environmental factor. Otherwise, it is not. The server returns the judgment result to A. A receives the answer from the server, and if the answer is a change in environment, A ignores the previous test result and chooses to go to sleep or wait for the next test result. If the server's answer is not a change in context. A then makes the judgement to the parking state, and the judgement to the parking stall state of parking stall inductor [ geomagnetic sensor ] is prior art, and this application does not do much the explanation.
According to the method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units, the magnetic field change caused by the environmental factors is eliminated through the magnetic field change detected by the adjacent sensors, the environmental magnetic force change can be effectively identified, and therefore the misjudgment is reduced; and then improve the rate of accuracy that the parking stall inductor detected. In addition, the parking sensing apparatus in the prior art generally integrates a plurality of sensors in order to make a more accurate judgment of parking. Such as magnetic plus microwave radar. Typically, when one sensor detects a change in parking status, a second sensor is activated to detect again. The method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units can avoid unnecessary operation of the sensor. Thereby achieving the effect of reducing power consumption.
In one embodiment, the method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units further comprises the following steps:
step S01A: acquiring a set first position of a first sensor;
step S02A: taking the parking space sensor which is within a preset range from the first position as a second sensor to be associated with the first sensor to form an associated group; the second sensors in the associated group are arranged from near to far according to the distance from the first sensor.
The working principle and the beneficial effects of the technical scheme are as follows:
the magnetic field changes influenced by the environment are all in a certain area, so that the certain area with the first inductor as the center is associated to form an associated group; and then realize realizing discerning the environmental impact with the linkage detection of associated group, improve parking stall inductor and detect the rate of accuracy.
In one embodiment, the method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units further comprises the following steps:
step S01B: acquiring historical magnetic force change data detected by all parking space sensors in a parking lot;
step S02B: analyzing historical magnetic force change data; acquiring linkage data which accords with a preset first rule;
step S03B: and associating the parking space induction corresponding to the linkage data to form an associated group.
The working principle and the beneficial effects of the technical scheme are as follows:
summarizing and counting from historical data, associating the linked parking space sensors to form an associated group, further realizing the identification of environmental influences by linkage detection of the associated group, and improving the detection accuracy of the parking space sensors.
In one embodiment, the first rule comprises:
and the historical magnetic force change data does not have parking space sensors with undetected magnetic force changes in the same preset time period threshold and/or in the region formed by the positions of the parking space sensors corresponding to the historical magnetic force change data and/or the historical magnetic force change data is not in the threshold range set for parking detection.
The working principle and the beneficial effects of the technical scheme are as follows:
whether the parking space sensors are linked or not is determined, whether the magnetic force changes when starting at the same time or not, whether the parking space sensors form a closed area or not is mainly considered, or the magnetic force change data is not in the threshold range set by parking detection.
In one embodiment, verifying the first magnetic force variation based on the plurality of second magnetic force variations includes:
when the number of the second magnetic force changes larger than the preset magnetic force change value is larger than the preset number;
and/or the presence of a gas in the gas,
when the position of the second sensor corresponding to the second magnetic force change and the position of the first sensor form a closed area, the parking space sensor which does not detect the magnetic force change does not exist;
and/or the presence of a gas in the gas,
when the difference value between the second magnetic force change and the first magnetic force change is smaller than a preset change difference value;
the verification is determined to be failed.
The working principle and the beneficial effects of the technical scheme are as follows:
during verification, when parking space sensors with the number larger than the preset number sense parking at the same time (the second magnetic force change is larger than the preset magnetic force change value), the fact that the magnetic field change influenced by the environment is not the magnetic force change caused by parking and exiting of the vehicle is shown; when all the parking space sensors which induce the magnetic force change form a closed area, the magnetic field change influenced by the environment can be determined; in addition, the magnetic force change can be numerically distinguished, when the vehicle stops, the magnetic force change value sensed by the first sensor and the magnetic force change value sensed by other parking space sensors in the associated group are larger than a preset threshold value, and therefore when the difference value between the second magnetic force change and the first magnetic force change is smaller than a preset change difference value, the magnetic field change influenced by the environment is determined.
In one embodiment, verifying the first magnetic force variation based on the plurality of second magnetic force variations includes:
extracting a plurality of characteristic values of the second magnetic force change, and bringing the characteristic values into a pre-established verification model for verification; or, a parking judgment library is established according to the historical magnetic force change data of the parking space sensors of the associated groups and the corresponding verification conditions, a judgment matrix is formed according to the magnetic force change data of each parking space sensor in the parking judgment library, and the expression of the judgment matrix is as follows:
wherein the content of the first and second substances,
is as follows
The first in the bar history magnetic force variation data
The magnetic force variation value detected by each parking space sensor;
establishing a mapping matrix of the judgment matrix according to the corresponding verification condition, wherein the expression of the mapping matrix is as follows:
wherein the content of the first and second substances,
is as follows
Verifying the condition corresponding to the first inductor corresponding to the historical magnetic force change data;
after the judgment matrix is constructed, according to the missing condition of the magnetic force variation value in the judgment matrix, executing deletion operation and value supplement operation on corresponding index data, and specifically comprising:
when the magnetic force change values exceeding a first preset number in one piece of historical magnetic force change data are missing, and/or the positions of the parking space sensors corresponding to the missing magnetic force change values are adjacent, and the missing number exceeds a second preset number; deleting the historical magnetic force change data, otherwise, executing a value supplementing operation;
the value complementing operation is realized by adopting the following formula:
wherein the content of the first and second substances,
to judge the first in the matrix
Line of
The missing magnetic force variation value of the column,
to judge the first in the matrix
Line of
The non-missing magnetic force variation value of the column;
constructing a judgment vector based on the plurality of second magnetic force changes and the first magnetic force changes which are obtained currently, wherein the judgment vector is as follows:
calculating the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, wherein the calculation formula is as follows:
;
wherein the content of the first and second substances,
is the first in the judgment vector and judgment matrix
Similarity between the bar historical magnetic change data;
to judge the second in the vector
A value of an element;
is as follows
The first in the bar history magnetic force variation data
A plurality of;
and determining the historical magnetic force change data corresponding to the maximum similarity according to the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, and acquiring the verification condition corresponding to the determined historical magnetic force change data from the mapping matrix.
The working principle and the beneficial effects of the technical scheme are as follows:
by establishing a parking judgment library, the purpose of directly judging whether the magnetic field change caused by the environmental factors exists or not according to the parking space sensors in the associated groups is achieved; constructing a judgment vector based on a plurality of second magnetic force changes and first magnetic force changes which are obtained currently, calculating the similarity between the judgment vector and each piece of historical magnetic force change data in a judgment matrix, determining the historical magnetic force change data corresponding to the maximum similarity according to the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, and obtaining the verification condition corresponding to the determined historical magnetic force change data from a mapping matrix; the magnetic field change caused by the environmental factors can be rapidly identified.
The invention also provides a method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units, which is applied to the first sensor and comprises the following steps:
when the first magnetic force change is detected to be larger than a preset magnetic force change value, calling a preset association group;
sequentially sending queries to second sensors in the associated group;
receiving feedback from the second sensor for the query; the feedback comprises a second magnetic force change detected by the second sensor;
verifying the first magnetic force variation based on the second magnetic force variation; when the verification is passed, entering parking state detection; and entering a standby mode when the verification is not passed.
The working principle and the beneficial effects of the technical scheme are as follows:
the parking space sensors can communicate with each other, when the change of the magnetic force is detected to be larger than the preset magnetic force change value, the parking space sensors in the associated group are inquired, and whether the sudden magnetic force change is caused by the environmental factor or not is identified by the data linkage of the adjacent sensors through the change of the magnetic force detected by the parking space sensors in the associated group. Verifying the first magnetic force change by adopting the second magnetic force change, and detecting a normal parking state when the verification is passed, wherein the verification is not caused by environmental factors; when the verification is not passed, the situation is caused by the environmental factor, and the parking space sensor enters a standby state.
According to the method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units, the magnetic field change caused by the environmental factors is eliminated through the magnetic field change detected by the adjacent sensors, the environmental magnetic force change can be effectively identified, and therefore the misjudgment is reduced; and then improve the rate of accuracy that the parking stall inductor detected. In addition, the parking sensing apparatus in the prior art generally integrates a plurality of sensors in order to make a more accurate judgment of parking. Such as magnetic plus microwave radar. Typically, when one sensor detects a change in parking status, a second sensor is activated to detect again. The method for improving the detection accuracy of the parking space sensor through the feedback of the nearby units can avoid unnecessary operation of the sensor. Thereby achieving the effect of reducing power consumption.
In one embodiment, verifying the first magnetic force variation based on the plurality of second magnetic force variations includes:
when the number of the second magnetic force changes larger than the preset magnetic force change value is larger than the preset number;
and/or the presence of a gas in the gas,
when the parking space sensor which does not detect the magnetic force change exists in the closed area formed by the position of the second sensor corresponding to the second magnetic force change and the position of the first sensor;
and/or the presence of a gas in the gas,
when the difference value between the second magnetic force change and the first magnetic force change is smaller than a preset change difference value;
the verification is determined to be failed.
The working principle and the beneficial effects of the technical scheme are as follows:
during verification, when parking space sensors with the number larger than the preset number sense parking at the same time (the second magnetic force change is larger than the preset magnetic force change value), the fact that the magnetic field change influenced by the environment is not the magnetic force change caused by parking and exiting of the vehicle is shown; when all the parking space sensors which induce the magnetic force change form a closed area, the magnetic field change influenced by the environment can be determined; in addition, the magnetic force change can be numerically distinguished, when the vehicle stops, the magnetic force change value sensed by the first sensor and the magnetic force change value sensed by other parking space sensors in the associated group are larger than a preset threshold value, and therefore when the difference value between the second magnetic force change and the first magnetic force change is smaller than a preset change difference value, the magnetic field change influenced by the environment is determined.
In one embodiment, verifying the first magnetic force variation based on the plurality of second magnetic force variations includes:
when the number of the second magnetic force changes larger than the preset magnetic force change value is larger than the preset number;
and/or the presence of a gas in the gas,
when the position of the second sensor corresponding to the second magnetic force change and the position of the first sensor form a closed area, the parking space sensor which does not detect the magnetic force change does not exist;
and/or the presence of a gas in the gas,
when the difference value between the second magnetic force change and the first magnetic force change is smaller than a preset change difference value;
the verification is determined to be failed.
The working principle and the beneficial effects of the technical scheme are as follows:
during verification, when parking space sensors with the number larger than the preset number sense parking at the same time (the second magnetic force change is larger than the preset magnetic force change value), the fact that the magnetic field change influenced by the environment is not the magnetic force change caused by parking and exiting of the vehicle is shown; when all the parking space sensors which induce the magnetic force change form a closed area, the magnetic field change influenced by the environment can be determined; in addition, the magnetic force change can be numerically distinguished, when the vehicle stops, the magnetic force change value sensed by the first sensor and the magnetic force change value sensed by other parking space sensors in the associated group are larger than a preset threshold value, and therefore when the difference value between the second magnetic force change and the first magnetic force change is smaller than a preset change difference value, the magnetic field change influenced by the environment is determined.
In one embodiment, verifying the first magnetic force variation based on the plurality of second magnetic force variations includes:
extracting a plurality of characteristic values of the second magnetic force change, and bringing the characteristic values into a pre-established verification model for verification; or, a parking judgment library is established according to the historical magnetic force change data of the parking space sensors of the associated groups and the corresponding verification conditions, a judgment matrix is formed according to the magnetic force change data of each parking space sensor in the parking judgment library, and the expression of the judgment matrix is as follows:
wherein the content of the first and second substances,
is as follows
The first in the bar history magnetic force variation data
The magnetic force variation value detected by each parking space sensor;
establishing a mapping matrix of the judgment matrix according to the corresponding verification condition, wherein the expression of the mapping matrix is as follows:
wherein the content of the first and second substances,
is as follows
Verifying the condition corresponding to the first inductor corresponding to the historical magnetic force change data;
after the judgment matrix is constructed, according to the missing condition of the magnetic force variation value in the judgment matrix, executing deletion operation and value supplement operation on corresponding index data, and specifically comprising:
when the magnetic force change values exceeding a first preset number in one piece of historical magnetic force change data are missing, and/or the positions of the parking space sensors corresponding to the missing magnetic force change values are adjacent, and the missing number exceeds a second preset number; deleting the historical magnetic force change data, otherwise, executing a value supplementing operation;
the value complementing operation is realized by adopting the following formula:
wherein the content of the first and second substances,
to judge the first in the matrix
Line of
The missing magnetic force variation value of the column,
to judge the first in the matrix
Line of
The non-missing magnetic force variation value of the column;
constructing a judgment vector based on the plurality of second magnetic force changes and the first magnetic force changes which are obtained currently, wherein the judgment vector is as follows:
calculating the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, wherein the calculation formula is as follows:
wherein the content of the first and second substances,
is the first in the judgment vector and judgment matrix
Similarity between the bar historical magnetic change data;
to judge the second in the vector
A value of an element;
is as follows
The first in the bar history magnetic force variation data
A plurality of;
and determining the historical magnetic force change data corresponding to the maximum similarity according to the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, and acquiring the verification condition corresponding to the determined historical magnetic force change data from the mapping matrix.
The working principle and the beneficial effects of the technical scheme are as follows:
by establishing a parking judgment library, the purpose of directly judging whether the magnetic field change caused by the environmental factors exists or not according to the parking space sensors in the associated groups is achieved; constructing a judgment vector based on a plurality of second magnetic force changes and first magnetic force changes which are obtained currently, calculating the similarity between the judgment vector and each piece of historical magnetic force change data in a judgment matrix, determining the historical magnetic force change data corresponding to the maximum similarity according to the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, and obtaining the verification condition corresponding to the determined historical magnetic force change data from a mapping matrix; the magnetic field change caused by the environmental factors can be rapidly identified.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. The utility model provides a method for through near unit feedback improvement parking stall inductor detection accuracy, is applied to the server, its characterized in that includes:
step S11: receiving a first magnetic force change detected by a first sensor;
step S12: when the first magnetic force variation is larger than a preset magnetic force variation value, sequentially inquiring a plurality of second sensors in the association group of the first sensor to obtain a plurality of second magnetic force variations; the second sensor is a parking space sensor within a preset range of the first sensor, and the plurality of parking space sensors within the preset range are one associated group;
step S13: verifying the first magnetic force change based on the plurality of second magnetic force changes, and outputting a parking state detection instruction to the first sensor when the first magnetic force change passes the verification; when the verification fails, sending a standby instruction to the first inductor; the verification is to judge whether the first magnetic force change is caused by environmental change, if so, the verification is not passed, and if not, the verification is passed; the verifying the first magnetic force variation based on a plurality of the second magnetic force variations comprises:
establishing a parking judgment library according to the historical magnetic force change data of the parking space sensors of the associated group and the corresponding verification condition, and forming a judgment matrix according to the magnetic force change data of each parking space sensor in the parking judgment library, wherein the judgment matrix is expressed as follows:
wherein the content of the first and second substances,
is as follows
The first in the bar history magnetic force variation data
The magnetic force change value detected by each parking space sensor;
establishing a mapping matrix of the judgment matrix according to the corresponding verification condition, wherein the expression of the mapping matrix is as follows:
wherein the content of the first and second substances,
is as follows
Verifying the condition corresponding to the first sensor corresponding to the historical magnetic force change data;
after the judgment matrix is constructed, according to the missing condition of the magnetic force variation value in the judgment matrix, executing deletion operation and value supplement operation on corresponding index data, specifically comprising:
when the magnetic force change values exceeding a first preset number in one piece of historical magnetic force change data are missing, and/or the positions of the parking space sensors corresponding to the missing magnetic force change values are adjacent, and the missing number exceeds a second preset number; deleting the historical magnetic force change data, otherwise, executing a value supplementing operation;
the value complementing operation is realized by adopting the following formula:
wherein the content of the first and second substances,
is the first in the judgment matrix
Line of
The missing magnetic force variation value of the column,
is the first in the judgment matrix
Line of
The non-missing magnetic force variation value of the column;
constructing a judgment vector based on the plurality of second magnetic force changes and the first magnetic force changes which are obtained currently, wherein the judgment vector is as follows:
calculating the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, wherein the calculation formula is as follows:
wherein the content of the first and second substances,
is the first of the judgment vector and the judgment matrix
Similarity between the bar historical magnetic change data;
is the first in the judgment vector
A value of an element;
is as follows
The first in the bar history magnetic force variation data
The magnetic force change value detected by each parking space sensor;
and determining the historical magnetic force change data corresponding to the maximum similarity according to the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, and acquiring the verification condition corresponding to the determined historical magnetic force change data from the mapping matrix.
2. The method for improving the detection accuracy of the parking space sensor through the feedback of the nearby unit as claimed in claim 1, further comprising:
step S01A: acquiring a first position set by the first sensor;
step S02A: associating the parking space sensor which is within a preset range from the first position as the second sensor with the first sensor to form the association group; the second sensors are arranged in the association group from near to far according to the distance from the first sensor.
3. The method for improving the detection accuracy of the parking space sensor through the feedback of the nearby unit as claimed in claim 1, further comprising:
step S01B: acquiring historical magnetic force change data detected by all parking space sensors in a parking lot;
step S02B: analyzing the historical magnetic force change data; acquiring linkage data which accords with a preset first rule; wherein the first rule comprises: the historical magnetic force change data is in the same preset time period threshold value and/or in a region formed by the positions of the parking space sensors corresponding to the historical magnetic force change data, the parking space sensors with undetected magnetic force changes do not exist, and/or the historical magnetic force change data is not in the threshold range set for parking detection;
step S03B: and associating the parking space sensors corresponding to the linkage data to form the association group.
4. The method of claim 1, wherein the verifying the first magnetic force variation based on the plurality of second magnetic force variations comprises:
when the number of the second magnetic force changes larger than the preset magnetic force change value is larger than the preset number;
and/or the presence of a gas in the gas,
when the parking space sensor which does not detect the magnetic force change exists in a closed area formed by the position of the second sensor corresponding to the second magnetic force change and the position of the first sensor;
and/or the presence of a gas in the gas,
when the difference value between the second magnetic force change and the first magnetic force change is smaller than a preset change difference value;
the verification is determined to be failed.
5. The utility model provides a method for improve parking stall inductor detection accuracy through near unit feedback, is applied to first inductor, its characterized in that includes:
when the first magnetic force change is detected to be larger than a preset magnetic force change value, calling a preset association group; the second sensor is a parking space sensor within a preset range of the first sensor, and the plurality of parking space sensors within the preset range are one associated group;
sequentially sending queries to second sensors in the association group;
receiving feedback from the second sensor to the query; the feedback comprises a second change in magnetic force detected by the second sensor;
verifying the first change in magnetic force based on the second change in magnetic force; when the verification is passed, entering parking state detection; when the verification is not passed, entering a standby mode; the verification is to judge whether the first magnetic force change is caused by environmental change, if so, the verification is not passed, and if not, the verification is passed; the verifying the first magnetic force variation based on a plurality of the second magnetic force variations comprises:
establishing a parking judgment library according to the historical magnetic force change data of the parking space sensors of the associated group and the corresponding verification condition, and forming a judgment matrix according to the magnetic force change data of each parking space sensor in the parking judgment library, wherein the judgment matrix is expressed as follows:
wherein the content of the first and second substances,
is as follows
The first in the bar history magnetic force variation data
The magnetic force change value detected by each parking space sensor;
establishing a mapping matrix of the judgment matrix according to the corresponding verification condition, wherein the expression of the mapping matrix is as follows:
wherein the content of the first and second substances,
is as follows
Verifying the condition corresponding to the first sensor corresponding to the historical magnetic force change data;
after the judgment matrix is constructed, according to the missing condition of the magnetic force variation value in the judgment matrix, executing deletion operation and value supplement operation on corresponding index data, specifically comprising:
when the magnetic force change values exceeding a first preset number in one piece of historical magnetic force change data are missing, and/or the positions of the parking space sensors corresponding to the missing magnetic force change values are adjacent, and the missing number exceeds a second preset number; deleting the historical magnetic force change data, otherwise, executing a value supplementing operation;
the value complementing operation is realized by adopting the following formula:
wherein the content of the first and second substances,
is the first in the judgment matrix
Line of
The missing magnetic force variation value of the column,
is the first in the judgment matrix
Line of
The non-missing magnetic force variation value of the column;
constructing a judgment vector based on the plurality of second magnetic force changes and the first magnetic force changes which are obtained currently, wherein the judgment vector is as follows:
calculating the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, wherein the calculation formula is as follows:
wherein the content of the first and second substances,
is the first of the judgment vector and the judgment matrix
Similarity between the bar historical magnetic change data;
is the first in the judgment vector
A value of an element;
is as follows
The first in the bar history magnetic force variation data
The magnetic force change value detected by each parking space sensor;
and determining the historical magnetic force change data corresponding to the maximum similarity according to the similarity between the judgment vector and each piece of historical magnetic force change data in the judgment matrix, and acquiring the verification condition corresponding to the determined historical magnetic force change data from the mapping matrix.
6. The method of claim 5, wherein the verifying the first magnetic force variation based on the plurality of second magnetic force variations comprises:
when the number of the second magnetic force changes larger than the preset magnetic force change value is larger than the preset number;
and/or the presence of a gas in the gas,
when the position of the second sensor corresponding to the second magnetic force change and the position of the first sensor form a closed area, the parking space sensor which does not detect the magnetic force change does not exist;
and/or the presence of a gas in the gas,
when the difference value between the second magnetic force change and the first magnetic force change is smaller than a preset change difference value;
the verification is determined to be failed.
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