CN111580184A - Geomagnetic calibration method and system based on wireless signal strength - Google Patents
Geomagnetic calibration method and system based on wireless signal strength Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V13/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
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- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
Abstract
The invention relates to a geomagnetic calibration method based on wireless signal strength, which comprises the following steps: s10, recording a vehicle-free magnetic field initial value detected by the geomagnetic sensor when the parking space is free of vehicles and a vehicle-free wireless signal initial value of the wireless communication module; s20, sequentially recording a magnetic field value, a wireless signal value, a magnetic field value and a wireless signal value when the vehicle enters and leaves the parking space; s30, calculating the average value of the magnetic field with the vehicle, the average value of the wireless signal with the vehicle and the average value of the magnetic field without the vehicle after the recorded vehicle is not less than three times when driving in and out; and S40, if the difference between the average value of the vehicle magnetic field and the initial value of the vehicle-free magnetic field is larger than the magnetic field judgment threshold value, and the difference between the average value of the vehicle wireless signal and the initial value of the vehicle-free signal is larger than the signal judgment threshold value, setting the average value of the vehicle-free magnetic field as a new vehicle-free threshold value, otherwise, repeating the steps S10 to S30. The method can complete calibration only through stopping for a plurality of times, and has the advantages of simple calibration, high detection accuracy and low maintenance cost.
Description
Technical Field
The invention relates to a calibration method of a geomagnetic sensor, in particular to a geomagnetic calibration method and a geomagnetic calibration system based on wireless signal intensity.
Background
Vehicle detection by utilizing the geomagnetic principle needs to perform initial magnetic field calibration work after the geomagnetic vehicle detector is installed. Because the earth magnetic field is stable within a range of several kilometers, and the change of the earth magnetic field caused by each vehicle is different, the initialization magnetic field calibration work is carried out, and no vehicle is required to be parked on an installation parking space, if a vehicle is parked, the vehicle needs to be removed, and the road parking space is a scarce public resource, so that the vehicle is difficult to be moved during actual initialization magnetic field calibration.
In addition, the service life of the geomagnetic vehicle detector is generally more than 5 years, and the environment changes in the 5-year service process, the hysteresis effect of the device per se and the construction of large-scale infrastructure all cause the drift of the calibration value of the initial magnetic field for the first time, thereby causing inaccurate detection. The current method for solving the inaccurate detection is to carry out the magnetic field calibration initialization again, and the actual operation is very inconvenient.
Disclosure of Invention
In order to solve the problems, the invention provides a geomagnetic calibration method based on wireless signal strength, which is simple in calibration, does not need manual calibration, can complete calibration only by stopping for several times, has high detection accuracy and reduces the manual maintenance cost because the geomagnetic sensor is always calibrated in the using process, and the specific technical scheme is as follows:
a geomagnetic calibration method based on wireless signal strength comprises the following steps:
s10, recording a vehicle-free magnetic field initial value detected by the geomagnetic sensor when the parking space is free of vehicles and a vehicle-free wireless signal initial value of the wireless communication module;
s20, sequentially recording a magnetic field value, a wireless signal value, a magnetic field value and a wireless signal value when the vehicle enters and leaves the parking space;
s30, calculating the average value of the magnetic field with the vehicle, the average value of the wireless signal with the vehicle and the average value of the magnetic field without the vehicle after the recorded magnetic field value with the vehicle, wireless signal value with the vehicle, magnetic field value without the vehicle and wireless signal value without the vehicle are not less than three times;
and S40, if the difference between the average value of the vehicle magnetic field and the initial value of the vehicle-free magnetic field is larger than the magnetic field judgment threshold value, and the difference between the average value of the vehicle wireless signal and the initial value of the vehicle-free signal is larger than the signal judgment threshold value, setting the average value of the vehicle-free magnetic field as a new vehicle-free threshold value, otherwise, repeating the steps S10 to S30.
Further, between the steps S20 and S30, the method further includes entering S30 if the value of the vehicle-free magnetic field is equal to the initial value of the vehicle-free magnetic field and the value of the vehicle-free wireless signal is equal to the initial value of the vehicle-free wireless signal, otherwise, returning to S20; and calculating the magnetic field average value with the vehicle, the wireless signal average value with the vehicle and the wireless signal average value without the vehicle after the magnetic field value with the vehicle, the wireless signal value with the vehicle, the magnetic field value without the vehicle and the wireless signal value without the vehicle recorded in the step S30 are continuously not less than three times.
Further, the magnetic field judgment threshold is 20-50, and the signal judgment threshold is 5-20.
Further, after the recorded magnetic field value, wireless signal value, magnetic field value and wireless signal value are not less than five times, the average value of the magnetic field, the average value of the wireless signal and the average value of the magnetic field are calculated.
A geomagnetic calibration system based on wireless signal strength comprises a geomagnetic detection module, a wireless communication module and a wireless communication module, wherein the geomagnetic detection module is used for detecting whether a vehicle and a magnetic field value exist in a parking space; the parking space 2.4GHz wireless module is used for receiving and transmitting wireless signals and detecting wireless signal values; the parking space detection control module is electrically connected with the geomagnetic detection module and the parking space 2.4GHz wireless module respectively, and is used for detecting and recording magnetic field values and wireless signal values of vehicles and vehicles without vehicles, calculating vehicle magnetic field average values, vehicle wireless signal average values and vehicle-free magnetic field average values, comparing the calculated vehicle magnetic field average values and vehicle wireless signal average values with vehicle-free magnetic field values and vehicle-free wireless signal values, and determining whether the vehicle-free magnetic field average values are used as vehicle-free threshold values according to a comparison structure; the gateway 2.4GHz wireless module is used for communicating with the parking space 2.4GHz wireless module; the gateway control module is electrically connected with the gateway 2.4GHz wireless module and is used for controlling the communication between the gateway 2.4GHz wireless module and the parking space 2.4GHz wireless module.
Compared with the prior art, the invention has the following beneficial effects:
the geomagnetic calibration method based on the wireless signal strength provided by the invention does not need manual calibration, can complete calibration only through stopping for several times, is simple in calibration, can always perform calibration in the use process of the geomagnetic sensor, and has high detection accuracy and low maintenance cost.
Drawings
Fig. 1 is a flowchart of a geomagnetic calibration method based on wireless signal strength;
fig. 2 is a block diagram of a geomagnetic calibration system based on wireless signal strength.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Example one
A geomagnetic calibration method based on wireless signal strength comprises the following steps:
s10, recording a vehicle-free magnetic field initial value detected by the geomagnetic sensor when the parking space is free of vehicles and a vehicle-free wireless signal initial value of the wireless communication module;
s20, sequentially recording a magnetic field value, a wireless signal value, a magnetic field value and a wireless signal value when the vehicle enters and leaves the parking space;
s30, calculating the average value of the magnetic field with the vehicle, the average value of the wireless signal with the vehicle and the average value of the magnetic field without the vehicle after the recorded magnetic field value with the vehicle, wireless signal value with the vehicle, magnetic field value without the vehicle and wireless signal value without the vehicle are not less than three times;
and S40, if the difference between the average value of the vehicle magnetic field and the initial value of the vehicle-free magnetic field is larger than the magnetic field judgment threshold value, and the difference between the average value of the vehicle wireless signal and the initial value of the vehicle-free signal is larger than the signal judgment threshold value, setting the average value of the vehicle-free magnetic field as a new vehicle-free threshold value, otherwise, repeating the steps S10 to S30.
The recorded magnetic field value, wireless signal value, magnetic field value and wireless signal value of no vehicle are not less than three times, which means that no less than three vehicles drive in and out, thus three groups of magnetic field values, wireless signal values, magnetic field values and wireless signal values can be detected.
The wireless communication module is a 2.4GHz wireless module. The magnetic field value is a magnetic field intensity value, and the wireless signal value is a wireless signal intensity value.
The magnetic field judgment threshold is 20-50, and the signal judgment threshold is 5-20.
The recorded magnetic field value, wireless signal value, magnetic field value and wireless signal value can also be calculated by calculating the average value of the magnetic field, the average value of the wireless signal and the average value of the magnetic field. The average value calculated by recording more times is more accurate, but can not be less than three times, and can be selected according to actual needs.
After the detection system on the parking space is installed, the parking space detection system is started, the geomagnetic sensor and the wireless communication module respectively detect an initial magnetic field value and a wireless signal value without a vehicle, and the detected magnetic field value without a vehicle is used as a reference for judging whether the vehicle exists in the parking space.
Then recording a magnetic field value and a wireless signal value when a vehicle enters a parking space, then respectively calculating average values after recording three or more groups of magnetic field values, wireless signal values and wireless signal values to obtain a magnetic field average value, a wireless signal average value and a magnetic field average value, then respectively subtracting the magnetic field average value and the wireless signal value, if the obtained magnetic field difference value is greater than a magnetic field judgment threshold value, calibrating the magnetic field value without the vehicle when the obtained wireless signal difference value is greater than the signal judgment threshold value, and taking the calculated magnetic field average value without the vehicle as a new threshold value without the vehicle which is used for judging whether the vehicle exists in the parking space.
Example two
The method also comprises the step of entering S30 if the value of the vehicle-free magnetic field is equal to the initial value of the vehicle-free magnetic field and the value of the vehicle-free wireless signal is equal to the initial value of the vehicle-free wireless signal between the steps S20 and S30, or returning to S20; and calculating the magnetic field average value with the vehicle, the wireless signal average value with the vehicle and the wireless signal average value without the vehicle after the magnetic field value with the vehicle, the wireless signal value with the vehicle, the magnetic field value without the vehicle and the wireless signal value without the vehicle recorded in the step S30 are continuously not less than three times.
The magnetic field judgment threshold is 20-50, and the signal judgment threshold is 5-20. Next, a specific procedure will be described when the magnetic field determination threshold is 35, the signal determination threshold is 10, and the result of the continuous detection reaches five times.
As shown in fig. 1, a geomagnetic calibration method based on wireless signal strength includes the following steps:
s101, recording a vehicle-free magnetic field initial value T0 detected by a geomagnetic sensor when a vehicle is not in a parking space and a vehicle-free wireless signal initial value R0 of a wireless communication module;
s102, when a vehicle enters and exits a parking space for the first time, respectively recording a vehicle magnetic field value T1, a vehicle wireless signal value R1, a vehicle-free magnetic field value T2 and a vehicle-free wireless signal value R2;
s103, after the vehicle leaves the parking space for the first time, if the detected magnetic field value T2 without the vehicle is the same as the initial value T0 of the magnetic field without the vehicle and the value R2 of the wireless signal without the vehicle is the same as the initial value R0 of the wireless signal without the vehicle, the S104 is started, and if not, the S102 is returned;
s104, respectively recording a car magnetic field value T3, a car wireless signal value R3, a car-free magnetic field value T4 and a car-free wireless signal value R4 when a car enters and exits the parking space for the second time;
s105, after the vehicle leaves the parking space for the second time, if the detected magnetic field value T4 without the vehicle is the same as the initial value T0 of the magnetic field without the vehicle and the value R4 of the wireless signal without the vehicle is the same as the initial value R0 of the wireless signal without the vehicle, the S106 is started, and if not, the S102 is returned;
s106, respectively recording a car magnetic field value T5, a car wireless signal value R5, a car-free magnetic field value T6 and a car-free wireless signal value R6 when a car enters and exits the parking space for the third time;
s107, after the vehicle leaves the parking space for the third time, if the detected magnetic field value T6 without the vehicle is the same as the initial value T0 of the magnetic field without the vehicle and the wireless signal value R6 without the vehicle is the same as the initial value R0 of the wireless signal without the vehicle, the S108 is started, and if not, the S102 is returned;
s108, respectively recording a car magnetic field value T7, a car wireless signal value R7, a car-free magnetic field value T8 and a car-free wireless signal value R8 when a car enters and exits the parking space for the fourth time;
s109, after the fourth vehicle leaves the parking space, if the detected magnetic field value T8 without the vehicle is the same as the initial value T0 of the magnetic field without the vehicle and the value R8 of the wireless signal without the vehicle is the same as the initial value R0 of the wireless signal without the vehicle, the S110 is started, and if not, the S102 is returned;
s110, recording a vehicle magnetic field value T9, a vehicle wireless signal value R9, a vehicle-free magnetic field value T10 and a vehicle-free wireless signal value R10 respectively when the vehicle enters and exits the parking space for the fifth time;
s111, after the vehicle leaves the parking space for the fifth time, if the detected magnetic field value T10 without the vehicle is the same as the initial value T0 of the magnetic field without the vehicle, and the value R10 of the wireless signal without the vehicle is the same as the initial value R0 of the wireless signal without the vehicle, the operation goes to S112, and if not, the operation returns to S102;
s112, calculating the average value of the magnetic field with the vehicle, the average value of the wireless signal with the vehicle and the average value of the magnetic field without the vehicle;
s113, if the average value-T0 of the magnetic field of the vehicle is more than 35 and the average value-R0 of the wireless signal of the vehicle is more than 10, the step S114 is carried out, and if not, the step S102 is carried out;
and S114, taking the average value of the non-vehicle magnetic field as a new non-vehicle threshold value.
The geomagnetic calibration method based on the wireless signal strength provided by the invention does not need manual calibration, can complete calibration only through stopping for several times, is simple in calibration, can always perform calibration in the use process of the geomagnetic sensor, and has high detection accuracy and low maintenance cost.
EXAMPLE III
As shown in fig. 2, a geomagnetic calibration system based on wireless signal strength includes a geomagnetic detection module, where the geomagnetic detection module is configured to detect whether a vehicle is located in a parking space and a magnetic field value; the parking space 2.4GHz wireless module is used for receiving and transmitting wireless signals and detecting wireless signal values; the parking space detection control module is electrically connected with the geomagnetic detection module and the parking space 2.4GHz wireless module respectively, and is used for detecting and recording magnetic field values and wireless signal values of vehicles and vehicles without vehicles, calculating vehicle magnetic field average values, vehicle wireless signal average values and vehicle-free magnetic field average values, comparing the calculated vehicle magnetic field average values and vehicle wireless signal average values with vehicle-free magnetic field values and vehicle-free wireless signal values, and determining whether the vehicle-free magnetic field average values are used as vehicle-free threshold values according to a comparison structure; the gateway 2.4GHz wireless module is used for communicating with the parking space 2.4GHz wireless module; the gateway control module is electrically connected with the gateway 2.4GHz wireless module and is used for controlling the communication between the gateway 2.4GHz wireless module and the parking space 2.4GHz wireless module.
The gateway control module is connected with the parking space management system.
The interference of adjacent parking spaces is very serious when the single geomagnetic detection module detects, and 2.4GHz wireless signals have obvious signal attenuation when having shelters from objects, and can carry out auxiliary vehicle judgment to the geomagnetic detection module through this characteristic.
Still include power module, parking stall wireless communication module and gateway wireless communication module, power module and parking stall wireless communication module and parking stall detection control module electric connection, gateway wireless communication module and gateway control module electric connection. The parking space wireless communication module and the gateway wireless communication module are 433MHz wireless modules.
The 433MHz wireless module sends the collected data to the gateway module, the module has the function of wireless spread spectrum, can carry out wireless transmission on the data by a plurality of preset carrier waves, and can not cause too large influence on the whole wireless transmission even if a single channel has interference, thereby reducing the packet loss rate of the wireless transmission and increasing the transmission distance. 433MHz signal attenuation is not suitable for directly judging the existence of the vehicle, because 4333MHz diffraction capability is strong, when the signal changes are not consistent, the signal changes are blocked.
Claims (5)
1. A geomagnetic calibration method based on wireless signal strength is characterized by comprising the following steps:
s10, recording a vehicle-free magnetic field initial value detected by the geomagnetic sensor when the parking space is free of vehicles and a vehicle-free wireless signal initial value of the wireless communication module;
s20, sequentially recording a magnetic field value, a wireless signal value, a magnetic field value and a wireless signal value when the vehicle enters and leaves the parking space;
s30, calculating the average value of the magnetic field with the vehicle, the average value of the wireless signal with the vehicle and the average value of the magnetic field without the vehicle after the recorded magnetic field value with the vehicle, wireless signal value with the vehicle, magnetic field value without the vehicle and wireless signal value without the vehicle are not less than three times;
and S40, if the difference between the average value of the vehicle magnetic field and the initial value of the vehicle-free magnetic field is larger than the magnetic field judgment threshold value, and the difference between the average value of the vehicle wireless signal and the initial value of the vehicle-free signal is larger than the signal judgment threshold value, setting the average value of the vehicle-free magnetic field as a new vehicle-free threshold value, otherwise, repeating the steps S10 to S30.
2. The method of claim 1, further comprising, between steps S20 and S30, entering S30 if the value of the magnetic field is equal to the initial value of the magnetic field and the value of the wireless signal is equal to the initial value of the wireless signal, otherwise returning to S20;
and calculating the magnetic field average value with the vehicle, the wireless signal average value with the vehicle and the wireless signal average value without the vehicle after the magnetic field value with the vehicle, the wireless signal value with the vehicle, the magnetic field value without the vehicle and the wireless signal value without the vehicle recorded in the step S30 are continuously not less than three times.
3. The method according to claim 1 or 2, wherein the magnetic field determination threshold is 20-50, and the signal determination threshold is 5-20.
4. The geomagnetic calibration method based on wireless signal strength according to claim 1 or 2, wherein the recorded magnetic field value with vehicle, wireless signal value with vehicle, magnetic field value without vehicle and wireless signal value without vehicle are all calculated five times and then the average value of the magnetic field with vehicle, the average value of the wireless signal with vehicle and the average value of the magnetic field without vehicle are calculated.
5. A geomagnetic calibration system based on wireless signal strength is characterized by comprising
The geomagnetic detection module is used for detecting whether a vehicle exists in the parking space and detecting a magnetic field value;
the parking space 2.4GHz wireless module is used for receiving and transmitting wireless signals and detecting wireless signal values;
the parking space detection control module is electrically connected with the geomagnetic detection module and the parking space 2.4GHz wireless module respectively, and is used for detecting and recording magnetic field values and wireless signal values of vehicles and vehicles without vehicles, calculating vehicle magnetic field average values, vehicle wireless signal average values and vehicle-free magnetic field average values, comparing the calculated vehicle magnetic field average values and vehicle wireless signal average values with vehicle-free magnetic field values and vehicle-free wireless signal values, and determining whether the vehicle-free magnetic field average values are used as vehicle-free threshold values according to a comparison structure;
the gateway 2.4GHz wireless module is used for communicating with the parking space 2.4GHz wireless module;
the gateway control module is electrically connected with the gateway 2.4GHz wireless module and is used for controlling the communication between the gateway 2.4GHz wireless module and the parking space 2.4GHz wireless module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114373306A (en) * | 2022-01-12 | 2022-04-19 | 中国公路工程咨询集团有限公司 | Vehicle passing detection method and system based on intelligent spike and storable medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006113706A (en) * | 2004-10-13 | 2006-04-27 | Systec:Kk | Vehicle detection device by magnetic sensor |
| CN103117003A (en) * | 2013-01-17 | 2013-05-22 | 杭州快泊信息技术有限公司 | Self-calibration threshold self-adjusting parking space detection method |
| CN104361765A (en) * | 2014-11-24 | 2015-02-18 | 天津理工大学 | Parking space detecting system based on magnetoresistive sensor and ZigBee |
| CN104732799A (en) * | 2013-12-24 | 2015-06-24 | 感知技术无锡有限公司 | Parking spot state detection method and device |
| US20200043328A1 (en) * | 2018-08-01 | 2020-02-06 | Parkifi, Inc. | Parking sensor magnetometer calibration |
-
2020
- 2020-05-07 CN CN202010377128.5A patent/CN111580184A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006113706A (en) * | 2004-10-13 | 2006-04-27 | Systec:Kk | Vehicle detection device by magnetic sensor |
| CN103117003A (en) * | 2013-01-17 | 2013-05-22 | 杭州快泊信息技术有限公司 | Self-calibration threshold self-adjusting parking space detection method |
| CN104732799A (en) * | 2013-12-24 | 2015-06-24 | 感知技术无锡有限公司 | Parking spot state detection method and device |
| CN104361765A (en) * | 2014-11-24 | 2015-02-18 | 天津理工大学 | Parking space detecting system based on magnetoresistive sensor and ZigBee |
| US20200043328A1 (en) * | 2018-08-01 | 2020-02-06 | Parkifi, Inc. | Parking sensor magnetometer calibration |
Non-Patent Citations (2)
| Title |
|---|
| JINHUI LAN ET AL.: "Vehicle Detection and Recognition Based on a MEMS Magnetic Sensor", 《IEEE》 * |
| 高全勇: "基于地磁的车辆探测系统研制", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114373306A (en) * | 2022-01-12 | 2022-04-19 | 中国公路工程咨询集团有限公司 | Vehicle passing detection method and system based on intelligent spike and storable medium |
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Application publication date: 20200825 |