CN104200701A - Parking space detection comprehensive judgment method - Google Patents
Parking space detection comprehensive judgment method Download PDFInfo
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- CN104200701A CN104200701A CN201410423804.2A CN201410423804A CN104200701A CN 104200701 A CN104200701 A CN 104200701A CN 201410423804 A CN201410423804 A CN 201410423804A CN 104200701 A CN104200701 A CN 104200701A
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Abstract
The invention relates to a parking space detection comprehensive judgment method. The technical features are that the parking space detection comprehensive judgment method comprises the following steps of: mounting at least two geomagnetic parking space detectors on one parking space, and keeping a distance between every two geomagnetic parking space detectors; acquiring corresponding data at the same by the at least two geomagnetic parking space detectors at the same parking space through respective geomagnetic sensor modules and RSSI (Received Signal Strength Indicator) value monitoring modules, and sending the data to a parking space detection server; performing vehicle-existence judgment by the parking space detection server by adopting a vehicle-existence primary judgment method and combining with a vehicle-existence secondary judgment method; performing no-vehicle judgment by the parking space detection server by adopting the no-vehicle primary judgment method and combining with the no-vehicle secondary judgment method. By adopting the method of combining the multiple geomagnetic sensors and the RSSI monitoring servers, and regarding the RSSI monitoring sensors as the secondary judgment method, the parking space detection comprehensive judgment method solves the problems of detection limitation and accuracy of a single sensor, and accordingly efficiently improves the precision of the geomagnetic parking space detection.
Description
Technical field
The invention belongs to parking position detection technique field, especially a kind of parking stall measure synthetic determination method.
Background technology
At present, conventionally adopt wireless method to carry out the parking stall measure of parking lay-by, its detection difficulty is complicacy and the uncontrollability of open type parking ground surrounding enviroment: those are flutterred institute's Electromagnetic Interference blurred, that come and go and usually cause geomagnetic parking stall detector generation erroneous judgement.Although people once tried every possible means, racked one's brains, improve parking stall measure precision to remove all kinds of obstacles, but, all the time, because people process parking stall measure problem according to conventional method all the time, and can not find all the time a kind of specific effective method for the specific question under particular surroundings, so parking stall measure precision is difficult to improve.Existing method for detecting parking stalls mainly contains following two kinds:
The first method for detecting parking stalls is: based on the detection method of single kind sensor.For example, in order to improve geomagnetic parking stall monitoring accuracy, people constantly attempting from the installation of the geomagnetic parking stall detector of current parking stall quantitatively, layout type takes certain method, although obtained very large achievement, but, each method has its limitation, each sensor also has its limitation, all can not reach and absolutely detect accurately, have self blind spot and dead point, the blind spot and the dead unit problem dependence single kind sensor that affect a few percent accuracy rate for those are helpless.
The second method for detecting parking stalls is: the Probability Detection method of judging based on majority, it adopts 1 above multiple geomagnetic parking stall detector to judge current parking space state, to exceed the testing result of half (containing all) or as a result of.One of the method deficiency: the situation that respectively accounts for half for parking space state testing result (have car, without car) cannot judge, for example: two of current parking stalls geomagnetic parking stall detector, one has been judged as car, one is judged as without car, probabilistic method can not be reached a conclusion for this situation, unless all had car to be judged as car, be all judged as without car without car; Two of the method deficiency: the quantity that the accuracy rate of its judgement depends on current parking stall installs geomagnetic parking stall detector, implementation cost is high, Just because of this, in the middle of reality, although feasible being difficult to of probabilistic method is used.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of parking stall measure synthetic determination method is provided, solved the problem that single-sensor detection method and Probability Detection method exist.
The present invention solves existing technical matters and takes following technical scheme to realize:
A kind of parking stall measure synthetic determination method, comprises the following steps:
Step 1: at least two geomagnetic parking stall detectors are installed on a parking stall, are maintained a certain distance between each geomagnetic parking stall detector, described geomagnetic parking stall detector comprises geomagnetic sensor module and RSSI value monitoring modular;
Step 2: at least two geomagnetic parking stall detectors on same parking stall pass through geomagnetic sensor module and the corresponding data of RSSI value monitoring modular collection separately simultaneously, and send to parking stall measure server;
Step 3: parking stall measure server adopts to have car owner to want decision method and be combined with car auxiliary judgement method has car to judge, the described car owner of having wants decision method to be: if when all geomagnetic parking stall detectors of current parking stall original state are judged as without car,, when at least 50% geomagnetic parking stall detector has car state from becoming without car, judge that current parking stall is for there being car; Described have car auxiliary judgement method for: if when the wireless signal RSSI value enhancing that between the geomagnetic parking stall detector of at least two of current parking stalls, mutually communication receives, judge that there is car current parking stall;
Step 4: parking stall measure server adopts without car owner wants decision method combination to carry out judging without car without car auxiliary judgement side, describedly want decision method without car owner: in the time that all geomagnetic parking stall detectors of original state have been judged as car, when more than at least 50% geomagnetic parking stall detector is from having car to be changed to without car state, judge that current parking stall is as without car; Described without car auxiliary judgement method is: when original state is when having car, if strengthened as the auxiliary judgement condition that has car using the wireless signal RSSI value that between the geomagnetic parking stall detector of at least two of current parking stalls, communication is received mutually, the RSSI value of at least two geomagnetic parking stall detector collections is all less than the RSSI value strengthening while having car, judges that current parking stall is without car.
And the data that described step 2 geomagnetic parking stall detector gathers by geomagnetic sensor module are the status data of current parking stall a car or car free; Described geomagnetic parking stall detector is received wireless signal strength value by the data of RSSI value monitoring modular collection.
And described geomagnetic parking stall detector is arranged on and is not more than 20 centimeters under shallow surface.
Advantage of the present invention and good effect are:
1, the present invention adopts at least two geomagnetic parking stall detectors is installed a parking stall, uses the wherein currency of half (containing more than half) geomagnetic parking stall detector to judge current parking space state with the method that all geomagnetic parking stall detector initial value combines: if the current parking stall all geomagnetic parking stall detectors of original state are judged as without car, 50% (containing) above geomagnetic parking stall detector has car state from becoming without car, and can be judged as current parking stall has car; If all geomagnetic parking stall detectors of original state have been judged as car, 50% (containing) above geomagnetic parking stall detector when having car to be changed to without car state, judges that current parking stall is without car; By above method, solve current parking stall because 50% geomagnetic parking stall detector occurs extremely, in the time that parking space state changes, its state of abnormal geomagnetic parking stall detector to occur and can not follow variation, a difficult problem that causes parking space state to judge.
2, the present invention is by the method that adopts multiple geomagnetic sensors and RSSI monitoring sensor to combine, using geomagnetic sensor as main determination methods, using RSSI monitoring sensor as auxiliary judgment method, make up mutually and reference each other with two kinds of sensors, thereby solve limitation and accuracy rate problem that single-sensor detects, thereby effectively improved the degree of accuracy that geomagnetic parking stall detects.
Brief description of the drawings
Fig. 1 is geomagnetic parking stall detector of the present invention installation site schematic diagram;
Fig. 2 is the circuit block diagram of the geomagnetic parking stall detector that adopts of the present invention;
Fig. 3 is the schematic diagram of storing cycle on geomagnetism detecting zero compensation point for geomagnetic parking stall detector;
Fig. 4 uses two mutual error correction schematic diagram of geomagnetic parking stall detector (zero compensation point is symmetrical before and after showing);
Fig. 5 is that while having car, the schematic diagram that reflection strengthens the RSSI value of geomagnetic parking stall detector occurs electromagnetic wave;
Fig. 6 is that the schematic diagram that reflection weakens the RSSI value of geomagnetic parking stall detector does not occur electromagnetic wave during without car.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is further described.
A kind of parking stall measure synthetic determination method, comprises the following steps:
Step 1: at least two geomagnetic parking stall detectors are installed on a parking stall, are maintained a certain distance between each geomagnetic parking stall detector; Described geomagnetic parking stall detector comprises geomagnetic sensor module and RSSI value monitoring modular.
As shown in Figure 1, two geomagnetic parking stall detectors are at least installed on a parking stall, the quantity of geomagnetic parking stall detector is preferably two, describes below as an example of two geomagnetic parking stall detectors of each parking stall installation example.Two geomagnetic parking stall detectors are arranged on along the central point both sides, parking stall on the length direction center line of parking stall, suppose that the size of rectangle parking stall is similar to the size of dolly, two geomagnetic parking stall detectors are installed on the center line along its length of rectangle parking stall, the installation site of two geomagnetic parking stall detectors is generally taking the suitable part at the two ends near rectangle parking stall as best, its reason is: one, two places that wheel is magnetic field concentration of car, geomagnetic parking stall detector is installed and is thereunder convenient to detect immediately, they are two years old, geomagnetic parking stall detector is closer apart from the barnyard at vehicle body two, be convenient to the wireless telecommunications between geomagnetic parking stall detector and parking stall measure server, therefore, geomagnetic parking stall detector should be not less than 0.5 meter apart from the edge at two ends, 0.5 meter is similar to the size of wheel to the tailstock, two geomagnetic parking stall detectors separately the installation site of the square central point of distance between 0.5 meter to 1.5 meters, to be not less than 0.5 meter as best, the distance of two additions is to be not less than 1 meter as best, if two geomagnetic parking stall detectors approach the central point of car, not only weaken communication effect, also can cause zero compensation point state of geomagnetic parking stall detector, geomagnetic parking stall detector is installed on that under shallow surface, to be not more than 20 centimeters of parts be best.
As shown in Figure 2, geomagnetic parking stall detector comprises CPU module, wireless communication module, geomagnetic sensor module, RSSI value detection module and power management module, CPU module is connected with wireless communication module, geomagnetic sensor module, RSSI value detection module respectively by I/O interface, and power management module is connected with CPU module, wireless communication module, RSSI value detection module, geomagnetic sensor module provides power supply for modules.Geomagnetic parking stall detector, as the node in the Sampling network of wireless parking stall, is connected with parking stall measure server by wireless communication mode, realizes the data communication facility of geomagnetic parking stall detector data and parking stall measure server.
Step 2: at least two geomagnetic parking stall detectors on same parking stall pass through geomagnetic sensor module and RSSI value monitoring modular collection data separately separately simultaneously, and send data to parking stall measure server.
In this step, the data that geomagnetic parking stall detector gathers by geomagnetic sensor module comprise: the status data of current parking stall a car or car free; Geomagnetic parking stall detector comprises by the data of RSSI value monitoring modular collection: the wireless signal strength value receiving; Geomagnetic parking stall detector is uploaded to parking stall measure server at interval of a period of time by AP (parking space information gatherer) by these two kinds of data that gather.Parking stall measure server is using these received two kinds of data as the Main Basis and the auxiliary foundation that judge parking space state.
Step 3: parking stall measure server adopts to have car owner to want decision method and be combined with car auxiliary judgement method has car to judge, the described car owner of having wants decision method to be: if when all geomagnetic parking stall detectors of current parking stall original state are judged as without car,, when 50% (containing) above geomagnetic parking stall detector has car state from becoming without car, judge that current parking stall is for there being car; Described have car auxiliary judgement method for: if when the wireless signal RSSI value enhancing that between the geomagnetic parking stall detector of at least two of current parking stalls, mutually communication receives, judge that there is car current parking stall.The enhancing of described wireless signal RSSI value is with respect to the enhancing at (also referred to as zero point) of RSSI reference point, judged by server end, two geomagnetic parking stall detectors of current parking stall are only responsible for the RSSI value gathering separately to send to server, and server judges according to RSSI value reference point whether the RSSI value that two of the current parking stalls geomagnetic parking stall detector that receives is uploaded strengthens.
The present invention's judgement has the adequate condition of car auxiliary judgement method to be: when the wireless signal RSSI value that between the geomagnetic parking stall detector of at least two of current parking stalls, communication receives mutually strengthens, must there is car, but this is not necessary condition, also be, in the time having car, RSSI value may not strengthen, in other words, in the time that the wireless signal RSSI value that between at least two geomagnetic parking stall detectors, communication receives mutually does not strengthen, not necessarily without car: due to material difference or other reason of car, there is car even if also can there is once in a while current parking stall, even if two parking space detectors are closed in an airtight environment, but after wireless signal transmission owing to being absorbed and not reflecting by certain reason, now, but although there is car RSSI value not strengthen. therefore, the enhancing of RSSI value is just determined with the adequate condition of car, it not necessary condition.
Step 4: parking stall measure server adopts without car owner wants decision method combination to carry out judging without car without car auxiliary judgement side, describedly want decision method without car owner: in the time that all geomagnetic parking stall detectors of original state have been judged as car, when more than at least 50% geomagnetic parking stall detector is from having car to be changed to without car state, judge that current parking stall is as without car; Described without car auxiliary judgement method is: when original state is when having car, if strengthened as the auxiliary judgement condition that has car using the wireless signal RSSI value that between the geomagnetic parking stall detector of at least two of current parking stalls, communication is received mutually, the RSSI value of at least two geomagnetic parking stall detector collections is all less than the RSSI value strengthening while having car, judges that current parking stall is without car.
The described precondition without car auxiliary judgement method must be that original state has been car, its principle is: during without car due between two geomagnetic parking stall detectors mutually communication signal do not reflect, and the RSSI value that they are received mutually reduces, but this reduction is with respect to the reduction of RSSI enhancing value that has car, it is a relative value, also the RSSI value when reduction of RSSI value must first have car while, judging without car strengthens RSSI value just can judge without car time and reduces.
Step 3, step 4 are core determination methods of the present invention, and the judgement principle first step 3 and step 4 being adopted describes:
(1) in step 3, step 4, there is car owner to want decision method and want the principle of decision method as follows without car owner:
1. to detect that zero compensation point and geomagnetic parking stall detector be magnetized be cause of the present invention to geomagnetic parking stall.Wherein, geomagnetism detecting zero compensation point impact has the judgement of car, the geomagnetic parking stall detector phenomenon impact judgement without car that is magnetized: as shown in Figure 3, in the time having car on parking stall, making a concerted effort because vehicle is by chance parked on geomagnetism detecting zero compensation point for geomagnetic parking stall detector, geomagnetic parking stall detector is accepted surrounding magnetic field is zero, because the magnetic flux that now geomagnetic parking stall detector receives does not change, therefore, even if there is car to be also judged as without car; In the time that vehicle leaves from current parking stall, due to one of them geomagnetic parking stall detector be magnetized (being generally the geomagnetic parking stall detector magnetization that high power engine is close to), even if vehicle leaves, but the field strength values of this geomagnetic parking stall detector output still keeps initial value, therefore, will be judged as car without car.
2. use the changing value of 1 geomagnetic parking stall detector of the initial value of two geomagnetic parking stall detectors+wherein as determination methods.When two one of geomagnetic parking stall detectors in ground have been judged as car, one is judged as without car, and its testing result ratio respectively accounts for for 50% lower time of situation, judges with their initial value:
For the first situation: in the time that initial value is all judged as without car, have car if one of them becomes, being judged as current parking stall has car, and judges that another geomagnetic parking stall detector not changing is zero compensation point geomagnetic parking stall detector.Its principle as shown in Figure 4, generally, when a geomagnetic parking stall detector is during in geomagnetism detecting zero point, another geomagnetic parking stall detector is arranged in non-zero points, proofread and correct with the geomagnetic parking stall detector being arranged in non-zero points the output error that is arranged on the geomagnetic parking stall detector on zero point, reach thus the object of mutually correcting a mistake with two geomagnetic parking stall detectors.
For the second situation: in the time that initial value has all been judged as car, if one of them becomes without car, be judged as current parking stall without car, and judge that another geomagnetic parking stall detector not changing is the geomagnetic parking stall detector being magnetized.Generally to occur the in the situation that of having car in current parking stall because geomagnetic parking stall detector is magnetized: due to current vehicle motor high-intensity magnetic field, so, the starting condition of this kind of determination methods is that two geomagnetic parking stall detectors all judge and have car, in the time that vehicle leaves, the geomagnetic parking stall detector not being magnetized detects parking space state from there being car to become without car, and the geomagnetic parking stall detector testing result being wherein magnetized is unchanged.
Above-mentioned have a car/want decision method without car owner, to produce zero compensation point geomagnetic parking stall detector and the geomagnetic parking stall detector that is magnetized respectively accounts under 50% prerequisite in hypothesis, because this hypothesis relatively tallies with the actual situation, but, as previously discussed, every kind of method has its limitation, all can not absolutely deal with problems, for the detection under extreme case (being that two geomagnetic parking stall detectors are all zero compensation point geomagnetic parking stall detector or are all magnetized), need to adopt the auxiliary judgement method in step 3, step 4.
(2) in step 3, step 4, there is a car auxiliary judgement method and as follows without the principle of car decision method:
As shown in Figure 5, when there being car on parking stall, because vehicle has covered geomagnetic parking stall detector (1,2), vehicle and two geomagnetic parking stall detectors have formed a kind of airtight environment, cause the radiowave of their transmittings, owing to running into barrier, reflection has occurred, due to wireless signal reflection having occurred, the wireless signal of two geomagnetic parking stall detector reception the other side transmitting is compared reference point and has been strengthened.The situation that the RSSI signal receiving according to geomagnetic parking stall detector strengthens with respect to reference point, can judge that current parking space state is for there being car.
As shown in Figure 6, in figure, dotted line represents that current parking stall is without car.When without car, suppose that two geomagnetic parking stall detectors (1,2) are around without any barrier, now, the radiowave of two geomagnetic parking stall detectors is launched towards periphery with 360 degree respectively, owing to not running into any barrier in the process of transmitting, a kind of ideal situation, so that the radiowave of launching presents is spherical.Because wireless signal that now two geomagnetic parking stall detectors receive the other side's transmitting is owing to not comprising reflected signal, so, now the RSSI enhancing value of the RSSI value of two parking space detectors when having car (Fig. 5) reduced, and its RSSI reduces later value and is less than the RSSI enhancing value while having car.
It is emphasized that; embodiment of the present invention is illustrative; instead of determinate; therefore the present invention includes and be not limited to the embodiment described in embodiment; every other embodiments that drawn by those skilled in the art's technical scheme according to the present invention, belong to the scope of protection of the invention equally.
Claims (3)
1. a parking stall measure synthetic determination method, is characterized in that comprising the following steps:
Step 1: at least two geomagnetic parking stall detectors are installed on a parking stall, are maintained a certain distance between each geomagnetic parking stall detector, described geomagnetic parking stall detector comprises geomagnetic sensor module and RSSI value monitoring modular;
Step 2: at least two geomagnetic parking stall detectors on same parking stall pass through geomagnetic sensor module and the corresponding data of RSSI value monitoring modular collection separately simultaneously, and send to parking stall measure server;
Step 3: parking stall measure server adopts to have car owner to want decision method and be combined with car auxiliary judgement method has car to judge, the described car owner of having wants decision method to be: if when all geomagnetic parking stall detectors of current parking stall original state are judged as without car,, when at least 50% geomagnetic parking stall detector has car state from becoming without car, judge that current parking stall is for there being car; Described have car auxiliary judgement method for: if when the wireless signal RSSI value enhancing that between the geomagnetic parking stall detector of at least two of current parking stalls, mutually communication receives, judge that there is car current parking stall;
Step 4: parking stall measure server adopts without car owner wants decision method combination to carry out judging without car without car auxiliary judgement side, describedly want decision method without car owner: in the time that all geomagnetic parking stall detectors of original state have been judged as car, when more than at least 50% geomagnetic parking stall detector is from having car to be changed to without car state, judge that current parking stall is as without car; Described without car auxiliary judgement method is: when original state is when having car, if strengthened as the auxiliary judgement condition that has car using the wireless signal RSSI value that between the geomagnetic parking stall detector of at least two of current parking stalls, communication is received mutually, the RSSI value of at least two geomagnetic parking stall detector collections is all less than the RSSI value strengthening while having car, judges that current parking stall is without car.
2. parking stall measure synthetic determination method according to claim 1, is characterized in that: the data that described step 2 geomagnetic parking stall detector gathers by geomagnetic sensor module are the status data of current parking stall a car or car free; Described geomagnetic parking stall detector is received wireless signal strength value by the data of RSSI value monitoring modular collection.
3. parking stall measure synthetic determination method according to claim 1, is characterized in that: described geomagnetic parking stall detector is arranged on and under shallow surface, is not more than 20 centimeters.
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| CN107749173A (en) * | 2017-10-10 | 2018-03-02 | 深圳普智联科机器人技术有限公司 | A kind of more ground magnetic chip parking space detector |
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| CN112162268A (en) * | 2020-08-19 | 2021-01-01 | 浙江创力电子股份有限公司 | Geomagnetic parking space detector and operation method thereof |
| CN113554768A (en) * | 2021-07-30 | 2021-10-26 | 四川长虹网络科技有限责任公司 | Parking space parking management method and parking space parking management system |
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