CN102722997B - Parking space detection method and system thereof - Google Patents
Parking space detection method and system thereof Download PDFInfo
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- CN102722997B CN102722997B CN201110460278.3A CN201110460278A CN102722997B CN 102722997 B CN102722997 B CN 102722997B CN 201110460278 A CN201110460278 A CN 201110460278A CN 102722997 B CN102722997 B CN 102722997B
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Abstract
The invention discloses a parking space detection method and a system thereof and relates to a wireless sensor network technology. The parking space detection system disclosed in the invention comprises a data management center and a parking space detection node apparatus, wherein the data management center is used to send data to the parking space detection node apparatus, receive a determination result of whether there is a vehicle parked in a parking space uploaded by the parking space detection node apparatus and carry out management on the parking space according to the received determination result; the parking space detection node apparatus is used to receive the data sent by the data management center, determine a signal strength indicator (RSSI) value according to frequency spectrum information of the received data, combines the current determined signal strength indicator value and a historical record data updating RSSI threshold, compares the current determined signal strength indicator value with the updated RSSI threshold, determine whether there is the vehicle in the parking space and upload the determination result to the data management center. The invention also discloses a parking space detection method. By using technical scheme of the invention, the parking space can be accurately measured and cost is reduced.
Description
Technical field
The present invention relates to wireless sensor network technology, particularly a kind of parking space detection method and system.
Background technology
Current traffic problems have become metropolitan common fault, the growth at full speed of automobile pollution make trip and parking problem increasingly serious, the people's that parking difficulty has had a strong impact on trip quality.Intelligent parking space detects can provide the parking space information in parking lot in real time, the total management system of urban parking area makes people can understand in real time current parking stall and takies situation, reasonably induction people sail idle parking lot into, reduce down time, raise the efficiency.
Mainly adopt at present following several parking stall detections of carrying out:
Infrared detector has or not by infrared reflection measurement vehicle, measure by infrared transmission and receive realizing, can effectively detect fast vehicle-state, but the environmental requirement that is provided with to infrared detector can not there be dirt, overcover to affect infrared reception transmitter.This class sensor is relatively applicable to parking garage, and the environment that someone takes care of is for a long time inapplicable for road both side roads parking stall.
Ultrasonic detector is by hyperacoustic transmitting and reflection measurement vehicle-state, but the same requirement of which can not have dirt, overcover to block ultrasound wave transmitter-receiver device, otherwise affect accuracy, be applicable to parking garage, be not also suitable for road bypass parking lot.
Video detecting device carrys out the state of measuring vehicle by the image comparison of video, because the installation site of camera is higher to environmental requirement, image comparison algorithm is complicated, the reference point assistant images contrast identification parking stall that also needs ground, system is applicable to the minority parking stall measure of simple environment, very large to the parking stall detection difficulty of complicated highway section.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of parking space detection method and system, the reliability detecting to improve parking stall.
In order to solve the problems of the technologies described above, the invention discloses a kind of parking site detecting system, at least comprise described control data corporation and parking stall detection node device, wherein:
Described control data corporation, sends data to described parking stall detection node device, and whether the parking stall that reception parking stall detection node device is uploaded stops to have the judged result of vehicle, and according to the judged result receiving, parking stall is managed;
Described parking stall detection node device, receive the data that described control data corporation sends, according to the spectrum information that receives data, determine signal intensity indication (RSSI) value, and upgrade RSSI threshold value in conjunction with current definite signal strength indication value and historical record data, RSSI threshold value by current definite signal strength indication value and after upgrading compares, judge that whether parking stall has car, is uploaded to described control data corporation by judged result.
Preferably, in said system, described parking stall detection node device comprises wireless device unit and CPU (central processing unit), wherein:
Described wireless device unit, the Data Concurrent that receives described control data corporation transmission is delivered to described CPU (central processing unit), and carry out signal strength analysis and obtain signal strength indication value receiving the spectrum information of data, and this signal strength indication value is sent to described CPU (central processing unit);
Described CPU (central processing unit), receive the data that described wireless device unit sends, resolve this data, if resolve, determine that these data are the data for detection of parking stall, judge whether the signal strength indication value that described wireless device unit sends belongs to without car RSSI average threshold scope, when the signal strength indication value of described wireless device unit transmission belongs to without car RSSI average threshold scope, determine that parking stall is without car, the signal strength indication value sending when described wireless device unit exceeds without car RSSI average threshold scope, determine that there is car on parking stall, and judged result is uploaded to described control data corporation, and definite parking stall is during without car, the signal strength indication value sending according to described wireless device unit and historical record without the renewal of car RSSI value without car RSSI average threshold scope, determine when there is car on parking stall, the absolute value of the signal strength indication value sending by described wireless device unit deducts without car RSSI mean value and has obtained car RSSI hop value, the mean value that has car RSSI hop value that has car RSSI hop value and historical record calculating, this mean value is multiplied by value that RSSI has a car minimum change parameter has a car RSSI saltus step threshold value after upgrading.
Preferably, in said system, described CPU (central processing unit), receive the data that described wireless device unit sends, resolve this data, if resolve, determine that these data are the data for configuration management, each configuration parameter and the low-power consumption sleep control information of this parking stall detection node device are set according to received data, and carry out work according to described configuration parameter, according to configured low-power consumption sleep control information, carry out low-power consumption sleep and control;
Wherein, configuration parameter at least comprises that data transmitting period, data transmitting channel and data transmission power and RSSI have car minimum change parameter;
Low-power consumption sleep control information at least comprises dormancy period.
Preferably, in said system, described parking stall detection node device also comprises:
Geomagnetic sensor, measures the magnetic field parameter of parking stall home environment, and the field strength values of measurement is sent to described CPU (central processing unit);
Described CPU (central processing unit), receive the field strength values that described geomagnetic sensor sends, whether the field strength values that judges current reception belongs to without car magnetic field average threshold scope, when if the field strength values of current reception belongs to without car magnetic field average threshold scope, determine that parking stall is without car, if the field strength values of current reception exceeds without car magnetic field average threshold scope, determine that there is car on parking stall, and judged result is uploaded to described control data corporation; And definite parking stall is during without car, according to upgrading without car magnetic field average threshold scope without car magnetic field value of the field strength values of current reception and historical record, determine when there is car on parking stall, with the absolute value of the field strength values of current reception, deduct without car magnetic field mean value and obtained car magnetic field hop value, calculate the calculated mean value that has car magnetic field hop value that has car magnetic field hop value and historical record, this mean value is multiplied by the value that there is car minimum change parameter in magnetic field has a car magnetic field saltus step threshold value after upgrading.
Preferably, in said system, described CPU (central processing unit), receive at the same time the data for detection of parking stall that control data corporation issues, and geomagnetic sensor send field strength values time, according to the data for detection of parking stall, judge whether parking stall has car respectively, according to field strength values, judge whether parking stall has car, when two judged results are consistent, to described control data corporation, upload judged result, when two judged results are repelled each other, the large judged result of weighted value is uploaded to described control data corporation.
The invention also discloses a kind of parking space detection method, comprising:
Control data corporation sends data to parking stall detection node device;
In parking site detecting system, detection node device in parking stall receives the data that control data corporation sends, according to the spectrum information that receives data, determine signal intensity indication (RSSI) value, in conjunction with current definite signal strength indication value and historical record data, upgrade RSSI threshold value, RSSI threshold value by current definite signal strength indication value and after upgrading compares, judge whether parking stall has car, and judged result is uploaded to described control data corporation;
Whether the parking stall that described control data corporation reception parking stall detection node device is uploaded stops to have the judged result of vehicle, according to the judged result receiving, parking stall is managed.
Preferably, in said method, according to the spectrum information that receives data, determine signal strength indication value, and upgrade RSSI threshold value in conjunction with current definite signal strength indication value and historical record data, RSSI threshold value by current definite signal strength indication value and after upgrading compares, judge whether parking stall has car, and judged result is uploaded to described control data corporation refers to:
Described parking stall detection node device carries out signal strength analysis to the spectrum information of reception data and obtains signal strength indication value, resolve the data of receiving, if resolve, determine that these data are the data for detection of parking stall, whether the signal strength indication value that discriminatory analysis obtains belongs to without car RSSI average threshold scope, when the signal strength indication value obtaining when analysis belongs to without car RSSI average threshold scope, determine that parking stall is without car, judged result is uploaded to described control data corporation, the mean value without car RSSI value of the signal strength indication value that computational analysis obtains and historical record, this mean value is updated to the average threshold without car RSSI,
The signal strength indication value obtaining when analysis exceeds without car RSSI average threshold scope, determine that there is car on parking stall, judged result is uploaded to described control data corporation, the absolute value of the signal strength indication value obtaining with analysis deducts without car RSSI mean value and has obtained car RSSI hop value, the mean value that has car RSSI hop value that has car RSSI hop value and historical record calculating, this mean value is multiplied by value that RSSI has a car minimum change parameter has a car RSSI saltus step threshold value after upgrading.
Preferably, in said method, described parking stall detection node device is resolved and is determined that these data are the data for configuration management, each configuration parameter and the low-power consumption sleep control information of this parking stall detection node device are set according to received data, according to set configuration parameter, carry out work, according to configured low-power consumption sleep control information, carry out low-power consumption sleep and control;
Wherein, configuration parameter at least comprises that data transmitting period, data transmitting channel and data transmission power and RSSI have car minimum change parameter;
Low-power consumption sleep control information at least comprises dormancy period.
Preferably, in said method, described parking stall detection node device is also measured the magnetic field parameter of parking stall home environment, whether the field strength values that pre-test is worked as in judgement belongs to without car magnetic field average threshold scope, if when the field strength values of pre-test belongs to without car magnetic field average threshold scope, determine that parking stall is without car, judged result is uploaded to described control data corporation, according to upgrading without car magnetic field average threshold scope without car magnetic field value of the field strength values when pre-test and historical record;
If when the field strength values of pre-test exceeds without car magnetic field average threshold scope, determine that there is car on parking stall, judged result is uploaded to described control data corporation, with the absolute value of working as the field strength values of pre-test, deduct without car magnetic field mean value and obtained car magnetic field hop value, calculate the calculated mean value that has car magnetic field hop value that has car magnetic field hop value and historical record, this mean value is multiplied by the value that there is car minimum change parameter in magnetic field has a car magnetic field saltus step threshold value after upgrading.
Preferably, in said method, described parking stall detection node device, when receiving the data for detection of parking stall that control data corporation issues, while measuring the field strength values of parking stall home environment, according to the data for detection of parking stall, judge whether parking stall has car respectively, according to field strength values, judge whether parking stall has car, when two judged results are consistent, to described control data corporation, upload judged result, when two judged results are repelled each other, the large judged result of weighted value is uploaded to described control data corporation.
Present techniques scheme has been selected RSSI module, and dynamically arranges RSSI threshold value, can accurately measure parking stall, and reduce costs.In addition, the application's preferred version, adopting on the basis of RSSI module, has also increased earth magnetism module, to improve the accuracy of measurement.In addition, present techniques scheme has also overcome the problem that in the detection technique of existing parking stall, means are single, environmental suitability is poor and installation and maintenance cost is high.
Embodiment
Fig. 1 is parking site detecting system structural representation in the present embodiment 1;
Fig. 2 is parking stall detection node apparatus structure schematic diagram in the present embodiment 2;
Fig. 3 realizes the process flow diagram that parking stall is detected in the present embodiment 3.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in connection with accompanying drawing, technical solution of the present invention is described in further detail.It should be noted that, in the situation that not conflicting, the application's embodiment and the feature in embodiment can combine arbitrarily mutually.
Embodiment 1
The present embodiment provides a kind of parking site detecting system, as shown in Figure 1, at least comprises a control data corporation and a plurality of parking stalls detection node device.
Control data corporation, sends data to parking stall detection node device, and receives the parking stall that parking stall detection node uploads and whether stop to have the judged result of vehicle, and according to the judged result receiving, parking stall is managed.For example, externally user points out room, parking stall information etc.
Parking stall detection node device, receive the data that control data corporation sends, according to the spectrum information that receives data, determine signal intensity indication (RSSI) value, and upgrade RSSI threshold value in conjunction with current definite signal strength indication value and historical record data, RSSI threshold value by current definite signal strength indication value and after upgrading compares, judge whether parking stall has car, and judged result is uploaded to control data corporation.
In the present embodiment, parking stall detection node device can comprise CPU (central processing unit) and wireless device unit.
Wireless device unit, receives the Data Concurrent that control data corporation sends and delivers to CPU (central processing unit), and carries out signal strength analysis and obtain signal strength indication value receiving the spectrum information of data, and this signal strength indication value is sent to CPU (central processing unit);
CPU (central processing unit), receive the data that wireless device unit sends, resolve this data, if resolve, determine that these data are the data for detection of parking stall, judge whether the signal strength indication value that wireless device unit sends belongs to without car RSSI average threshold scope, when the signal strength indication value of wireless device unit transmission belongs to without car RSSI average threshold scope, determine that parking stall is without car, the signal strength indication value sending when wireless device unit exceeds without car RSSI average threshold scope, determine that there is car on parking stall, and judged result is uploaded to described control data corporation, and definite parking stall is during without car, upgrading without car RSSI average threshold scope without car RSSI value of the signal strength indication value sending according to wireless device unit and historical record, determine when there is car on parking stall, the absolute value of the signal strength indication value sending by wireless device unit deducts without car RSSI mean value and has obtained car RSSI hop value, determine the mean value that has car RSSI hop value that has car RSSI hop value and historical record calculate, this mean value is multiplied by value that RSSI has a car minimum change parameter has a car RSSI hop value after upgrading.
CPU (central processing unit), resolve after the data of wireless device unit transmission, if determine, these data are the data for configuration management, each configuration parameter and the low-power consumption sleep control information of this parking stall detection node device are set according to received data, and carry out work according to configured configuration parameter, according to configured low-power consumption sleep control information, carry out low-power consumption sleep and control;
Wherein, configuration parameter at least wraps data transmitting period, data transmitting channel and data transmission power and RSSI has car minimum change parameter;
Low-power consumption sleep control information at least comprises dormancy period.
Also have in some schemes, consider that RSSI value may be subject to environmental impact, thus geomagnetic sensor in the detection node device of parking stall, increased to carry out parking stall detection in conjunction with RSSI value, thus strengthen the adaptability of parking stall detection node device to environment.Now, parking stall detection node device as shown in Figure 2.Geomagnetic sensor, measures the magnetic field parameter of parking stall home environment, and the field strength values of measurement is sent to CPU (central processing unit).Particularly, geomagnetic sensor can be when the triggering of receiving CPU (central processing unit), to start to measure the magnetic field parameter of parking stall home environment, and CPU (central processing unit) can be while receiving the data for detection of parking stall of control data corporation transmission, to start to trigger geomagnetic sensor to measure.Also have in some schemes, geomagnetic sensor also can periodic measurement parking stall home environment magnetic field parameter and be uploaded to CPU (central processing unit), CPU (central processing unit) sends to control data corporation by magnetic field parameter and judged result by wireless device unit, wherein, can be that control data corporation is handed down to CPU (central processing unit) by the packet for configuration management the measuring period of geomagnetic sensor.
CPU (central processing unit), whether the field strength values that judges current reception belongs to without car magnetic field average threshold scope, when if the field strength values of current reception belongs to without car magnetic field average threshold scope, determine that parking stall is without car, if the field strength values of current reception exceeds without car magnetic field average threshold scope, determine that there is car on parking stall, and judged result is uploaded to described control data corporation; And definite parking stall is during without car, according to upgrading without car magnetic field average threshold scope without car magnetic field value of the field strength values of current reception and historical record, determine when there is car on parking stall, with the absolute value of the field strength values of current reception, deduct without car magnetic field mean value and obtained car magnetic field hop value, calculate the calculated mean value that has car magnetic field hop value that has car magnetic field hop value and historical record, this mean value is multiplied by the value that there is car minimum change parameter in magnetic field has a car magnetic field hop value after upgrading.
It should be noted that, CPU (central processing unit), receive at the same time the data for detection of parking stall that control data corporation issues, when start detection earth magnetism obtains the field strength values of geomagnetic sensor transmission, can according to the RSSI data for detection of parking stall, judge whether parking stall has car respectively, according to field strength values, judge whether parking stall has car, when two judged results are consistent, directly to control data corporation, upload judged result, when two judged results are repelled each other, the large judged result of weighted value is uploaded to described control data corporation.Wherein, the weighted value of these two judged results can be by control data corporation by the data configuration that issues to parking stall detection node device.
Embodiment 2
The present embodiment is introduced a kind of parking space detection method, and the system that the method can provide based on embodiment 1 realizes.Particularly, the method comprises the steps, as shown in Figure 3:
Step 100, control data corporation sends data to parking stall detection node device.
Step 200, when parking stall detection node device receives the data of control data corporation transmission in parking site detecting system, determines signal intensity indication (RSSI) value according to the spectrum information that receives data.
In this step, thereby carrying out signal strength analysis to the spectrum information of reception data, parking stall detection node device obtains signal strength indication value.
Step 300, parking stall detection node device upgrades RSSI threshold value in conjunction with current definite signal strength indication value and historical record data, the RSSI threshold value of parking stall detection node device by current definite signal strength indication value and after upgrading compares, judge whether parking stall has car, and judged result is uploaded to described control data corporation.
In this step, parking stall detection node device, resolves the data of receiving, if resolve, determines that these data are the data for detection of parking stall, and whether the signal strength indication value that discriminatory analysis obtains belongs to without car RSSI average threshold scope; When the signal strength indication value obtaining when analysis belongs to without car RSSI average threshold scope, determine that parking stall is without car, the signal strength indication value obtaining when analysis exceeds without car RSSI average threshold scope, determines that there is car on parking stall.
Wherein, the detailed process of the signal intensity indication information receiving and historical record data being compared to dynamically update to RSSI threshold value is, first judge that whether current RSSI value is valid data (are data be valid data) within the scope of rssi measurement, as effectively, more current RSSI value and historical record without car RSSI mean value, added car RSSI minimum transition threshold value sum, judge that these data are without car RSSI value or have car RSSI value.As current RSSI value belongs to the value without car RSSI within the scope of this, represent that parking stall is without car, now, current RSSI value is added without car RSSI Value Data storehouse, calculate make new advances without car RSSI mean value.
Current RSSI value is over having added car RSSI minimum transition threshold value sum without car RSSI mean value, represent that there is car on parking stall, with the absolute value of current RSSI value, deduct the mean value without car RSSI, calculating makes new advances car RSSI hop value, by new, have car RSSI hop value to add to have car RSSI hop value database again, calculating makes new advances have that car RSSI saltus step mean value, this mean value is multiplied by that RSSI has that car minimum change parameter (this parameter can arrange) must make new advances have a car RSSI minimum transition threshold value.
Step 300, whether the parking stall that control data corporation reception parking stall detection node device is uploaded stops to have the judged result of vehicle, according to the judged result receiving, parking stall is managed.For example, externally user points out room, parking stall information etc.
Consider that the own metal construction of automobile when geomagnetism detecting device can be by storing cycle affects near having or not of magnetic field judgement vehicle geomagnetic sensor, and geomagnetic sensor belongs to passive measurement, can have stronger adaptability to environment.Therefore based on the above method, some schemes have increased geomagnetism detecting mode, be about to RSSI and detect with geomagnetism detecting to combine to judge whether parking stall has car (judgement has car weight parameter and earth magnetism judgement to have the judgement of car weight parameter according to RSSI), thereby improve Detection accuracy.Now, parking stall detection node device is measured the magnetic field parameter of parking stall home environment by geomagnetic sensor, the field strength values of measurement and historical record data are compared to dynamically update magnetic field threshold value, again by the field strength values of measurement with upgrade after without car magnetic field mean value and have the minimum transition threshold value comparison of car magnetic field, judged whether car.It should be noted that, the magnetic field parameter of measuring parking stall home environment comprises X, Y, Z axis, and the related field strength values of the present embodiment is the weighted sum of the magnetic field intensity of these three axles.Weight ratio parameter as for each axle can be carried out long-range setting by control data corporation.Wherein, the CPU (central processing unit) in the detection node of parking stall can, when receiving the data for detection of parking stall that control data corporation sends, trigger the magnetic field parameter that geomagnetic sensor is measured parking stall home environment.The measuring period of the data configuration geomagnetic sensor for configuration management that CPU (central processing unit) also can send according to control data corporation, like this, according to magnetic field parameter that this, geomagnetic sensor can periodic measurement parking stall home environment measuring period and be uploaded to CPU (central processing unit).
Particularly, whether parking stall detection node device judgement belongs to without car magnetic field average threshold scope when the field strength values of pre-test, if when the field strength values of pre-test belongs to without car magnetic field average threshold scope, determine that parking stall is without car, judged result is uploaded to described control data corporation, according to upgrading without car magnetic field average threshold scope without car magnetic field value of the field strength values when pre-test and historical record;
If when the field strength values of pre-test exceeds without car magnetic field average threshold scope, determine that there is car on parking stall, judged result is uploaded to described control data corporation, with the absolute value of working as the field strength values of pre-test, deduct without car magnetic field mean value and obtained car magnetic field hop value, calculate the calculated mean value that has car magnetic field hop value that has car magnetic field hop value and historical record, this mean value is multiplied by the value that there is car minimum change parameter in magnetic field has a car magnetic field hop value after upgrading.
It should be noted that, parking stall detection node device is when receiving the data for detection of parking stall that control data corporation issues, if also measured the field strength values of parking stall home environment, according to the data for detection of parking stall, judge whether parking stall has car respectively, according to field strength values, judge whether parking stall has car, when two judged results are consistent, to control data corporation, upload judged result again, when two judged results are repelled each other, the large judged result of weighted value is uploaded to described control data corporation.And the weighted value of these two judged results can be by control data corporation by the data configuration that issues to parking stall detection node device.
Have in addition in some schemes, while adopting at the same time RSSI detection mode and geomagnetism detecting mode, also increased dynamic-configuration parking stall detection node function, and function is controlled in low-power consumption sleep.Now, control data corporation sends to parking stall detection node device by the configuration parameter of parking stall detection node device and low-power consumption sleep control information with the form of packet.Like this, after CPU (central processing unit) receives that data comprise at every turn, resolution data bag, determines when this packet is the packet for managing, and therefrom extracts recording configuration parameter and low-power consumption sleep control information.And carry out corresponding data transmission according to recorded configuration parameter, according to recorded low-power consumption sleep control information, carry out low-power consumption sleep and control.
Wherein, configuration parameter at least comprises data transmitting period, data transmitting channel and data transmission power.Certainly, except these configuration parameters, can also comprise that duty, RSSI have car saltus step threshold value, RSSI to have car minimum change parameter, earth magnetism to have car saltus step threshold value (X, Y, Z tri-axles), earth magnetism to have weight proportion parameter, the RSSI judgement of car minimum change parameter (X, Y, Z tri-axles), earth magnetism three axles to have car weight parameter, earth magnetism judgement to have the important parameters such as car weight parameter.Low-power consumption sleep control information at least comprises dormancy period.
From above-described embodiment, can find out, present techniques scheme is embedded in parking space-detecting device underground, thereby is applicable to the installation environment of various indoor and outdoors, and underground owing to being embedded in, it is not subject to the environmental impacts such as sleet, and detecting reliability is high, and without manual maintenance, cost is low.In addition, present techniques scheme is by recording the value of sensor, filtering invalid data, and dynamic calculation judgment threshold, thus can get rid of autumn and winter early summer climatic environment and surrounding enviroment change the impact on detecting, reduce False Rate.The application's preferred version, can also pass through cycle dormancy, and the low-power consumption mode of timed sending, uploads data to relaying or gateway, is transferred to parking stall administrative center.Wherein, the transmission cycle of some important parameters can configure in real time, to facilitate networking debugging.
One of ordinary skill in the art will appreciate that all or part of step in said method can come instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as ROM (read-only memory), disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuit.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The application is not restricted to the combination of the hardware and software of any particular form.
The above, be only preferred embodiments of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a parking site detecting system, is characterized in that, this system at least comprises control data corporation and parking stall detection node device, wherein:
Described control data corporation, sends data to described parking stall detection node device, and whether the parking stall that reception parking stall detection node device is uploaded stops to have the judged result of vehicle, and according to the judged result receiving, parking stall is managed;
Described parking stall detection node device, receive the data that described control data corporation sends, according to the spectrum information that receives data, determine signal intensity indicating RSSI value, and upgrade RSSI threshold value in conjunction with current definite signal strength indication value and historical record data, RSSI threshold value by current definite signal strength indication value and after upgrading compares, judge that whether parking stall has car, is uploaded to described control data corporation by judged result;
Described parking stall detection node device comprises wireless device unit and CPU (central processing unit), wherein:
Described wireless device unit, the Data Concurrent that receives described control data corporation transmission is delivered to described CPU (central processing unit), and carry out signal strength analysis and obtain signal strength indication value receiving the spectrum information of data, and this signal strength indication value is sent to described CPU (central processing unit);
Described CPU (central processing unit), receive the data that described wireless device unit sends, resolve this data, if resolve, determine that these data are the data for detection of parking stall, judge whether the signal strength indication value that described wireless device unit sends belongs to without car RSSI average threshold scope, when the signal strength indication value of described wireless device unit transmission belongs to without car RSSI average threshold scope, determine that parking stall is without car, the signal strength indication value sending when described wireless device unit exceeds without car RSSI average threshold scope, determine that there is car on parking stall, and judged result is uploaded to described control data corporation, and definite parking stall is during without car, the signal strength indication value sending according to described wireless device unit and historical record without the renewal of car RSSI value without car RSSI average threshold scope, determine when there is car on parking stall, the absolute value of the signal strength indication value sending by described wireless device unit deducts without car RSSI mean value and has obtained car RSSI hop value, the mean value that has car RSSI hop value that has car RSSI hop value and historical record calculating, this mean value is multiplied by value that RSSI has a car minimum change parameter has a car RSSI saltus step threshold value after upgrading.
2. the system as claimed in claim 1, is characterized in that,
Described CPU (central processing unit), receive the data that described wireless device unit sends, resolve this data, if resolve, determine that these data are the data for configuration management, each configuration parameter and the low-power consumption sleep control information of this parking stall detection node device are set according to received data, and carry out work according to described configuration parameter, according to configured low-power consumption sleep control information, carry out low-power consumption sleep and control;
Wherein, configuration parameter at least comprises that data transmitting period, data transmitting channel and data transmission power and RSSI have car minimum change parameter;
Low-power consumption sleep control information at least comprises dormancy period.
3. system as claimed in claim 1 or 2, is characterized in that, described parking stall detection node device also comprises:
Geomagnetic sensor, measures the magnetic field parameter of parking stall home environment, and the field strength values of measurement is sent to described CPU (central processing unit);
Described CPU (central processing unit), receive the field strength values that described geomagnetic sensor sends, whether the field strength values that judges current reception belongs to without car magnetic field average threshold scope, when if the field strength values of current reception belongs to without car magnetic field average threshold scope, determine that parking stall is without car, if the field strength values of current reception exceeds without car magnetic field average threshold scope, determine that there is car on parking stall, and judged result is uploaded to described control data corporation; And definite parking stall is during without car, according to upgrading without car magnetic field average threshold scope without car magnetic field value of the field strength values of current reception and historical record, determine when there is car on parking stall, with the absolute value of the field strength values of current reception, deduct without car magnetic field mean value and obtained car magnetic field hop value, calculate the calculated mean value that has car magnetic field hop value that has car magnetic field hop value and historical record, this mean value is multiplied by the value that there is car minimum change parameter in magnetic field has a car magnetic field saltus step threshold value after upgrading.
4. system as claimed in claim 3, is characterized in that,
Described CPU (central processing unit), receive at the same time the data for detection of parking stall that control data corporation issues, and geomagnetic sensor send field strength values time, according to the data for detection of parking stall, judge whether parking stall has car respectively, according to field strength values, judge whether parking stall has car, when two judged results are consistent, to described control data corporation, upload judged result, when two judged results are repelled each other, the large judged result of weighted value is uploaded to described control data corporation.
5. a parking space detection method, is characterized in that, the method comprises:
Control data corporation sends data to parking stall detection node device;
In parking site detecting system, detection node device in parking stall receives the data that control data corporation sends, according to the spectrum information that receives data, determine signal intensity indicating RSSI value, in conjunction with current definite signal strength indication value and historical record data, upgrade RSSI threshold value, RSSI threshold value by current definite signal strength indication value and after upgrading compares, judge whether parking stall has car, and judged result is uploaded to described control data corporation;
Whether the parking stall that described control data corporation reception parking stall detection node device is uploaded stops to have the judged result of vehicle, according to the judged result receiving, parking stall is managed;
Wherein, according to the spectrum information that receives data, determine signal strength indication value, and upgrade RSSI threshold value in conjunction with current definite signal strength indication value and historical record data, RSSI threshold value by current definite signal strength indication value and after upgrading compares, judge whether parking stall has car, and judged result is uploaded to described control data corporation refers to:
Described parking stall detection node device carries out signal strength analysis to the spectrum information of reception data and obtains signal strength indication value, resolve the data of receiving, if resolve, determine that these data are the data for detection of parking stall, whether the signal strength indication value that discriminatory analysis obtains belongs to without car RSSI average threshold scope, when the signal strength indication value obtaining when analysis belongs to without car RSSI average threshold scope, determine that parking stall is without car, judged result is uploaded to described control data corporation, the mean value without car RSSI value of the signal strength indication value that computational analysis obtains and historical record, this mean value is updated to the average threshold without car RSSI,
The signal strength indication value obtaining when analysis exceeds without car RSSI average threshold scope, determine that there is car on parking stall, judged result is uploaded to described control data corporation, the absolute value of the signal strength indication value obtaining with analysis deducts without car RSSI mean value and has obtained car RSSI hop value, the mean value that has car RSSI hop value that has car RSSI hop value and historical record calculating, this mean value is multiplied by value that RSSI has a car minimum change parameter has a car RSSI saltus step threshold value after upgrading.
6. method as claimed in claim 5, is characterized in that,
Described parking stall detection node device is resolved and is determined that these data are the data for configuration management, each configuration parameter and the low-power consumption sleep control information of this parking stall detection node device are set according to received data, according to set configuration parameter, carry out work, according to configured low-power consumption sleep control information, carry out low-power consumption sleep and control;
Wherein, configuration parameter at least comprises that data transmitting period, data transmitting channel and data transmission power and RSSI have car minimum change parameter;
Low-power consumption sleep control information at least comprises dormancy period.
7. method as described in claim 5 or 6, is characterized in that,
Described parking stall detection node device is also measured the magnetic field parameter of parking stall home environment, whether the field strength values that pre-test is worked as in judgement belongs to without car magnetic field average threshold scope, if when the field strength values of pre-test belongs to without car magnetic field average threshold scope, determine that parking stall is without car, judged result is uploaded to described control data corporation, according to upgrading without car magnetic field average threshold scope without car magnetic field value of the field strength values when pre-test and historical record;
If when the field strength values of pre-test exceeds without car magnetic field average threshold scope, determine that there is car on parking stall, judged result is uploaded to described control data corporation, with the absolute value of working as the field strength values of pre-test, deduct without car magnetic field mean value and obtained car magnetic field hop value, calculate the calculated mean value that has car magnetic field hop value that has car magnetic field hop value and historical record, this mean value is multiplied by the value that there is car minimum change parameter in magnetic field has a car magnetic field saltus step threshold value after upgrading.
8. method as claimed in claim 7, is characterized in that,
Described parking stall detection node device, when receiving the data for detection of parking stall that control data corporation issues, while measuring the field strength values of parking stall home environment, according to the data for detection of parking stall, judge whether parking stall has car respectively, according to field strength values, judge whether parking stall has car, when two judged results are consistent, to described control data corporation, upload judged result, when two judged results are repelled each other, the large judged result of weighted value is uploaded to described control data corporation.
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