CN111179600B - Simplified multimode vehicle detector - Google Patents
Simplified multimode vehicle detector Download PDFInfo
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- CN111179600B CN111179600B CN202010113530.2A CN202010113530A CN111179600B CN 111179600 B CN111179600 B CN 111179600B CN 202010113530 A CN202010113530 A CN 202010113530A CN 111179600 B CN111179600 B CN 111179600B
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
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- G—PHYSICS
- G08—SIGNALLING
- 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
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Abstract
The invention discloses a simplified multimode vehicle detector which comprises a microprocessor, a geomagnetic sensor chip, an operational amplifier, a radar ranging module, a power supply unit, a microwave radio frequency communicator, a matched transceiver antenna and a visible light auxiliary detection circuit. The output signal of the geomagnetic sensor chip is amplified by the operational amplifier and then is input to the geomagnetic signal input end of the microprocessor, and the microprocessor is connected with the radar ranging module through the ranging interface end, is connected with the microwave radio frequency communicator through the communication end, is connected with the power supply unit through the control output end to ensure the power-saving work of related parts, and is connected with the visible light auxiliary detection circuit through the light detection interface end; according to the invention, a unique grading progressive strategy is adopted to detect the vehicle, geomagnetic and/or visible light data acquired by ultra-low power consumption is used for calculation under most conditions, so that a detection result with high confidence can be output without additionally starting a radar ranging module with larger power consumption, the detection accuracy is considered, the battery replacement and scrapping speeds of products are greatly delayed, the product is flexible, economical and practical, a large amount of manpower and material resource operation and maintenance investment can be saved, and the method is suitable for various intelligent traffic applications.
Description
Technical Field
The invention relates to a vehicle detector in the field of intelligent traffic, in particular to a multimode vehicle detector with simple structure and high efficiency.
Background
At present, the problems of serious unbalance of parking space supply, unbalanced use of the parking spaces, lack of effective sharing mechanism, island of parking lots and parking space information, difficult parking management and the like in large, medium and small domestic cities are increasingly remarkable, and the problems of high importance of related departments and social communities are brought into great importance. The installation of a vehicle detector (or parking space detector) for information unified management of berths has become an effective means for urban traffic management in many places, but at present, most of the vehicle detectors mainly take single-mode geomagnetism ("geomagnetic field" for short) as analysis and judgment, multimode detection products (geomagnetism combined with infrared, ultrasonic or radar and the like) are gradually paid attention to and accepted by customers, and in general, the following problems exist in the prior art, namely, the problems are more outstanding, and the improvement is needed to be solved: 1. the technical scheme disclosed by the prior invention patent (a vehicle detector based on TMR) (grant bulletin number: CN 203084928U) has remarkable effect of prolonging service life of equipment by utilizing a solar charging mechanism, but has the cost that more than half of panel positions are required to be reserved for placing a solar panel and related components thereof, which is enough for a single-mode geomagnetic detection product, the detection accuracy of the single-mode geomagnetic detection product in operation is found to be not high enough after years of practice, the detection efficiency is further improved to be a necessary choice by adopting a multimode detection means, and the large-scale popularization and application of the technologies of third-party Internet of things such as NB-IOT are required, and certain panel spaces are additionally allocated on both sides, so that bottleneck elements for restricting the updating of the product are formed due to the serious deficiency of the panel spaces under the condition that the product appearance size is limited and cannot be increased arbitrarily in the industry; 2. the technical scheme disclosed by the geomagnetic vehicle detector and geomagnetic vehicle detection system (authorized bulletin number: CN 207020822U) adopts the timing scanning and collecting the magnetic field value in a specific direction, and then starts to collect the magnetic field value in other directions when the magnetic field value reaches a preset value to achieve the aim of reducing power consumption, and the scheme has good detection and power saving effects on vehicles with standard parking, but has more outstanding missed detection conditions for vehicles with weak magnetic field fluctuation such as vehicles or electric vehicles which do not comply with the parking standard and are parked in disorder, and needs to be improved; 3. the existing multi-mode detection products and schemes disclosed in the industry generally have the advantages that whether vehicles exist or not is judged on the basis of unified analysis, comparison and calculation of multi-sensor data, and although the accuracy of the fusion mode is improved, the side effects of frequent unnecessary loss of battery energy, acceleration of battery replacement and even scrapping of products and the like are easily generated. From the above, the existing product has great optimization and improvement space in terms of two major core problems of power consumption control and detection accuracy.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a multimode vehicle detector which has the advantages of refined structure, high vehicle detection accuracy, low power consumption and controllability, and the technical problems are solved by avoiding the defects of the prior art, and the multimode vehicle detector is realized by the following technical proposal:
A compact multimode vehicle detector is designed and used, comprising: the device comprises a microprocessor, a geomagnetic sensor chip, an operational amplifier, a radar ranging module, a power supply unit, a microwave radio frequency communicator and a matched receiving and transmitting antenna thereof; the signal output end of the geomagnetic sensor chip is electrically connected with the signal input end of the operational amplifier, the geomagnetic signal output end of the operational amplifier is electrically connected with the geomagnetic signal input end of the microprocessor, the ranging interface end of the radar ranging module is electrically connected with the ranging interface end of the microprocessor, the control output end of the microprocessor is electrically connected with the control input end of the power supply unit, the communication end of the microprocessor is electrically connected with the communication end of the microwave radio frequency communicator, the transceiver antenna is electrically connected with the antenna end of the microwave radio frequency communicator, the normal output end of the power supply unit is electrically connected with the power input end of the microprocessor and the power input end of the microwave radio frequency communicator, the first output end of the power supply unit is electrically connected with the power input end of the geomagnetic sensor chip and the power input end of the operational amplifier, and the second output end of the power supply unit is electrically connected with the power input end of the radar ranging module; the microprocessor controls the power-on of the power supply unit to start the geomagnetic sensor chip and the operational amplifier to collect geomagnetic data (the power-off is closed after the collection is completed) for analysis of whether the vehicle is on or not, if the calculation meets the preset condition, the detection result is directly output, otherwise, the power-on of the power supply unit is further controlled to start the radar ranging module to collect ranging data (the power-off is closed after the collection is completed), and the detection result is output after comprehensive analysis processing.
Further, the simplified multimode vehicle detector further comprises a visible light auxiliary detection circuit; the visible light auxiliary detection circuit is electrically connected with the light detection interface end of the microprocessor to provide an electric signal which generates voltage change according to different brightness, and the visible light auxiliary detection circuit at least comprises: a photoresistor and a divider resistor; the microprocessor collects visible light data at fixed time or according to need in a low-power consumption mode through the visible light auxiliary detection circuit so as to assist in analysis and judgment of whether a vehicle exists or not and tracking and correction of geomagnetic background magnetic fields.
The microprocessor has the characteristics of low power consumption and high operation efficiency, and an ADC and/or a DAC converter are integrated in a chip; the operational amplifier is a single power supply CMOS operational amplifier, has the characteristics of wider bandwidth, low power supply voltage and low quiescent current consumption, can be used as a driving amplifier of an A/D converter, and can be packaged in a single operational amplifier or multiple operational amplifiers.
The microwave radio frequency communicator and the matched receiving and transmitting antenna thereof are functional components for carrying out wireless communication between the microprocessor and external equipment and/or a back-end system, and the microwave radio frequency communicator refers to a combination of one or more of an NB-IOT module, a Lora/LoraWAN/CLAA module, a 2.45GHz/433MHz wireless transceiver, a 4G/5G wireless communication module, a WiFi/Bluetooth/ANT/ZigBee wireless communication module.
The geomagnetic sensor chip is a linear sensor element for detecting the change of the earth magnetic field by adopting a magneto-resistance technology, has the characteristics of wide dynamic range, high sensitivity, low hysteresis and low power consumption, and can accurately measure the disturbance change of a vehicle to the geomagnetism in the single-axis or multi-axis direction; the geomagnetic sensor chip includes: anisotropic Magnetoresistive (AMR) sensors, tunneling Magnetoresistive (TMR) sensors, or Giant Magnetoresistive (GMR) sensors.
Further, the geomagnetic sensor chip is a TMR linear sensor chip of Jiangsu multidimensional technology limited company, and can be TMR2102 or TMR2103.
The radar ranging module is a special component which works in 24GHz or 77GHz frequency band and can perform distance measurement on a short-distance target object and comprises an antenna, a microwave signal processing part and an intermediate frequency signal processing part.
Further, the antenna and the microwave signal processing part of the radar ranging module are 24GHz or 77GHz radar ranging sensors; the intermediate frequency signal processing part of the radar ranging module can complete target distance calculation through an interface by the microprocessor or output a result to the microprocessor after completing target distance calculation through the built-in MCU.
The power supply unit is specially used for carrying out power supply management on all power utilization components in the equipment and can carry out power supply output control according to the requirements of the microprocessor, and at least comprises: lithium battery, lithium ion battery capacitor or composite pulse capacitor, voltage stabilizer, MOS tube.
Further, the voltage stabilizer is an ultra-low quiescent current buck-boost DC/DC converter of RP604 or RP605 series of photo electronic equipment limited company (Ricoh).
Compared with the prior art, the simple multimode vehicle detector has the following technical effects: 1. the new technology is applied to greatly simplify and optimize the design of the power supply unit, uses a large-capacity lithium battery and a matched capacitor thereof and an ultra-low quiescent current buck-boost DC/DC converter to perform voltage-stabilizing power supply, even if a solar charging mechanism is not provided, the solar panel can work continuously and stably in all weather under the closed severe environment with large temperature difference between the high temperature and the low temperature of outdoor sun and rain, thereby not only meeting the service life requirement of the product, but also meeting the necessary requirement of the product for the panel space in updating; 2. in a geomagnetic data timing scanning and collecting link, geomagnetic data in three mutually orthogonal directions is collected without difference to make detection judgment, and the method has obvious effects on vehicles which are not stopped normally and have weak magnetic field fluctuation, blocks product detection omission holes, greatly improves the application adaptability of products and lays a good foundation for large-area popularization; 3. by adopting a unique grading progressive strategy to detect the vehicle, geomagnetic and/or visible light data acquired by ultra-low power consumption are calculated under most conditions, so that a detection result with high confidence coefficient can be output without additionally starting a radar ranging module with larger power consumption.
Drawings
FIG. 1 is a schematic diagram of a simplified multi-mode vehicle detector according to the present invention;
FIG. 2 is a schematic diagram of the power supply unit architecture in a reduced-form multimode vehicle detector according to a preferred embodiment of the invention;
FIG. 3 is a schematic diagram of the structure of a visible light assisted detection circuit in a simplified multimode vehicle detector according to the present invention;
fig. 4 is a schematic diagram of a simplified multi-mode vehicle detector in accordance with a preferred embodiment of the present invention.
Detailed Description
Referring to fig. 1, a preferred embodiment of a reduced-form multimode vehicle detector of the invention comprises: the device comprises a microprocessor 5, a geomagnetic sensor chip 1, an operational amplifier 2, a radar ranging module 3, a power supply unit 4, a microwave radio frequency communicator 6, a matched transceiver antenna 7 and a visible light auxiliary detection circuit 8; the signal output end of the geomagnetic sensor chip 1 is electrically connected with the signal input end of the operational amplifier 2, the geomagnetic signal output end of the operational amplifier 2 is electrically connected with the geomagnetic signal input end of the microprocessor 5, the ranging interface end of the radar ranging module 3 is electrically connected with the ranging interface end of the microprocessor 5, the control output end of the microprocessor 5 is electrically connected with the control input end of the power supply unit 4, the communication end of the microprocessor 5 is electrically connected with the communication end of the microwave radio frequency communicator 6, the transceiver antenna 7 is electrically connected with the antenna end of the microwave radio frequency communicator 6, the normal output end of the power supply unit 4 is electrically connected with the power input end of the microprocessor 5 and the power input end of the microwave radio frequency communicator 6, the first output end of the power supply unit 4 is electrically connected with the power input end of the geomagnetic sensor chip 1 and the power input end of the operational amplifier 2, and the second output end of the power supply unit 4 is electrically connected with the power input end of the radar ranging module 3; the microprocessor 5 controls the power supply unit 4 to start the geomagnetic sensor chip 1 and the operational amplifier 2 to collect geomagnetic data in three mutually orthogonal directions at regular time (the power down is closed after the collection is completed) for vehicle analysis and vehicle analysis, if the calculation meets the preset condition, the detection result is directly output, otherwise, the power supply unit 4 is further controlled to start the radar ranging module 3 to collect ranging data (the power down is closed after the collection is completed), and the detection result is output after comprehensive analysis processing.
The geomagnetic sensor chip 1 is a linear sensor element for detecting the change of the earth magnetic field by adopting a magneto-resistance technology, has the characteristics of wide dynamic range, high sensitivity, low hysteresis and low power consumption, and can accurately measure the disturbance change of a vehicle to the geomagnetism in the single-axis or multi-axis directions; the geomagnetic sensor chip 1 includes: an Anisotropic Magnetoresistance (AMR) sensor, a Tunnel Magnetoresistance (TMR) sensor, or a Giant Magnetoresistance (GMR) sensor is preferably selected as the TMR linear sensor chip TMR2102 of three sheets of Jiangsu multidimensional technology limited and is made orthogonal two by two to provide geomagnetic signals in XYZ three axes, that is, TMR geomagnetic sensor chip 1 shown in fig. 4.
The microprocessor 5 has low power consumption and high operation performance, and an on-chip integrated ADC and/or DAC converter is used as an optimum, and in this example, an nRF24LE1 chip of the Nordic company, i.e., an ultra-low power consumption band enhancement 8051 core and a high-precision ADC converter are selected.
The operational amplifier 2 is a single power CMOS operational amplifier, has a wide bandwidth, a low supply voltage, and a low quiescent current consumption, and may be used as a driving amplifier of an a/D converter, and the packaging form may be a single operational amplifier or multiple operational amplifiers, as an optimum, a piece of MCP6004 of MicroChip company is selected as the optimum, three paths of signals in XYZ mutually orthogonal axes of the TMR geomagnetic sensor chip 1 are used to respectively perform driving amplification, and the signals are output to the geomagnetic signal input end of the microprocessor 5; the whole geomagnetic data acquisition process takes about 1 millisecond and consumes about 2 milliamperes.
The radar ranging module 3 is a special component which works in 24GHz or 77GHz frequency band and can perform distance measurement on a short-distance target object, and comprises an antenna, a microwave signal processing part and an intermediate frequency signal processing part; as 24GHz technology is mature, power consumption and size are small, as the best, a 24GHz radar ranging sensor is selected as an antenna and microwave signal processing part of the radar ranging module 3, and after target distance calculation is completed through a built-in MCU combined intermediate frequency signal processing circuit, a ranging result is output to the microprocessor 5 through a ranging interface end; the whole radar ranging data acquisition process takes about 200 milliseconds, consumes about 50 milliamperes, consumes 5000 times of geomagnetism and 1000 times of visible light.
The power supply unit 4 is dedicated for performing power management on each electrical component in the device, and can perform power output control according to the microprocessor requirement, as shown in fig. 2, and includes: a lithium battery 41, a lithium ion battery capacitor or composite pulse capacitor 42, a voltage stabilizer 43, a first MOS tube 44 and a second MOS tube 45; the lithium battery 41 is electrically connected with the positive electrode of the lithium ion battery capacitor or the composite pulse capacitor 42 in parallel and is electrically connected with the input end of the voltage stabilizer 43, the output end of the voltage stabilizer 43 is a normal output end for supplying power to the microprocessor 5 and the microwave radio frequency communicator 6, and the output end of the voltage stabilizer is simultaneously connected with the input ends of the first MOS tube 44 and the second MOS tube 45, so that the voltage stabilizer can supply power in a controlled manner through the first output end and/or the second output end under the control of the control output end of the microprocessor 5; as an optimum, the lithium battery 41 is two parallel ER34615 capacity lithium-thionyl chloride batteries of Yi-latitude lithium energy company, the lithium ion battery capacitor 42 is matched with SPC1520 of the Yi-latitude lithium energy company, the voltage stabilizer is a buck-boost DC/DC converter RP604K331B of RP604 series of photo-electronic equipment limited company (Ricoh), the voltage stabilizer has a quiescent current as low as 0.3uA, the maximum output current can be as high as 300mA, and the power consumption performance is optimum for similar products.
The microwave radio frequency communicator 6 and the matched receiving and transmitting antenna 7 thereof are functional components for performing wireless communication between the microprocessor 5 and external equipment and/or a back-end system, and the microwave radio frequency communicator 6 refers to one or more of an NB-IOT module, a Lora/LoraWAN/CLAA module, a 2.45GHz/433MHz wireless transceiver, a 4G/5G wireless communication module, a WiFi/Bluetooth/ANT/ZigBee wireless communication module. Optimally, in this embodiment, the microwave rf communicator 6 uses the combination of the NB-IOT module 62 and the 2.45GHz wireless transceiver 61 to perform wireless communication with the outside, as shown in fig. 4, and they are respectively connected with the matched transceiver antenna 72 and transceiver antenna 71 through antenna terminals in a wired manner, and are respectively connected with the communication terminal of the microprocessor 5 through respective communication terminals in a wired manner; the 2.45GHz wireless transceiver 61 is used for wireless firmware update and wireless initialization reset processing of a product without opening a cover, and is also used for triggering parking space type road side equipment to read ETC cards and the like, while the NB-IOT module 62 is used for reporting vehicle in-out state change data and timing contact heartbeat data to a back-end system and also receiving issuing data of the back-end system.
The auxiliary visible light detection circuit 8 is electrically connected to the light detection interface of the microprocessor 5 to provide an electrical signal with voltage variation according to brightness, as shown in fig. 3, and includes: a photoresistor 81 and a voltage dividing resistor 82; in this example, the photoresistor 81 is GL5528, the resistance value of which decreases with the increase of the illumination intensity, the bright resistance range is 8-20kΩ, the dark resistance is 1M Ω when no illumination is applied, and the voltage dividing resistor is 10K Ω, so that in the busiest period from 8 am to 8 pm, the parking position can basically sense the bright and dark change of the vehicle; the microprocessor 5 performs visible light data acquisition at regular time or according to the requirement, and only outputs a fixed and measurable high level through an A interface of the light detection interface end during acquisition, so that an electric signal corresponding to the current brightness can be obtained from a B interface of the light detection interface end, and the electric signal can be quantized and converted into visible light data and then used for assisting the microprocessor 5 in vehicle presence/absence analysis judgment and geomagnetic background magnetic field tracking correction; the whole visible light data acquisition process takes about 50 milliseconds, consumes about 200 microamps and is almost negligible.
The working principle of the simple multimode vehicle detector is as follows:
Firstly, the operating firmware, preset conditions and working parameters are updated and written into the Flash of the microprocessor 5 through the 2.45GHz wireless transceiver 61, wherein the preset conditions are at least divided into the following four types: A. the fluctuation of the magnetic field is larger (more than 55% of actual vehicles entering and exiting meet the condition), the fluctuation of the magnetic field is general, the fluctuation of the magnetic field is weaker, and the fluctuation of the magnetic field is tiny; after the update and writing are successful, the normal operation is started at any time, and only an external matched wireless reset device is needed to activate, the microprocessor 5 can receive a reset command through the 2.45GHz wireless transceiver 61, perform reset and initialization work, collect magnetic field data under the condition of empty space as a background magnetic field value, and then the geomagnetic data collected later is compared with the background magnetic field value by mean square error so as to balance and determine which preset condition is met.
Then, the microprocessor 5 collects geomagnetic data and visible light data at regular time according to working parameters, and if the preset condition D is met, the geomagnetic data and the visible light data are not further processed; if the preset condition A is met, directly outputting a detection result; if the preset condition B is met, the visible light data is acquired for assistance, if the visible light data is available and effective, the detection result is immediately output, and if the visible light data is unavailable or ineffective, the radar ranging data is further acquired, and then the detection result is output after comprehensive analysis; if the preset condition C is met, collecting visible light data and radar ranging data, and outputting a detection result after comprehensive analysis; in an extreme case, if the berth states determined by the visible light data and the radar ranging data are the same, but are opposite to the berth states determined by the geomagnetic data, the background magnetic field tracking and correcting process built in the microprocessor 5 is activated to support the dynamic change of the background magnetic field, so that the operation of manual resetting is avoided, and the adaptability of the product is stronger and more intelligent.
When the detection result data needs to be output, the microprocessor 5 packages the data according to a communication protocol, sends the data to the back-end system through the communication end to the NB-IOT module 62, and/or sends a trigger signal to the parking space type road side device through the 2.45GHz wireless transceiver 61 for starting the wireless communication with the ETC card.
Finally, all data transmissions are complete, microprocessor 5, NB-IOT module 62, and/or with 2.45GHz wireless transceiver 61 all enter sleep mode to ensure that the product maintains ultra-low energy consumption operation.
Claims (10)
1. A compact multi-mode vehicle detector is provided, characterized by comprising the following steps:
The device comprises a microprocessor, a geomagnetic sensor chip, an operational amplifier, a radar ranging module, a power supply unit, a microwave radio frequency communicator, a matched transceiver antenna and a visible light auxiliary detection circuit; the visible light auxiliary detection circuit is electrically connected with the light detection interface end of the microprocessor to provide an electric signal which generates voltage change along with different brightness; the signal output end of the geomagnetic sensor chip is electrically connected with the signal input end of the operational amplifier, the geomagnetic signal output end of the operational amplifier is electrically connected with the geomagnetic signal input end of the microprocessor, the ranging interface end of the radar ranging module is electrically connected with the ranging interface end of the microprocessor, the control output end of the microprocessor is electrically connected with the control input end of the power supply unit, the communication end of the microprocessor is electrically connected with the communication end of the microwave radio frequency communicator, the transceiver antenna is electrically connected with the antenna end of the microwave radio frequency communicator, the normal output end of the power supply unit is electrically connected with the power input end of the microprocessor and the power input end of the microwave radio frequency communicator, the first output end of the power supply unit is electrically connected with the power input end of the geomagnetic sensor chip and the power input end of the operational amplifier, and the second output end of the power supply unit is electrically connected with the power input end of the radar ranging module; the microprocessor is used for timing control of the power supply unit to be electrified and started and then to be electrified and shut down the geomagnetic sensor chip and the operational amplifier to acquire geomagnetic data in three mutually orthogonal directions for vehicle presence or absence analysis, the microprocessor is used for timing or on-demand acquisition of visible light data in a low-power consumption mode through the visible light auxiliary detection circuit so as to assist vehicle presence or absence analysis judgment and geomagnetic background magnetic field tracking correction, if the calculation meets preset conditions, a detection result is directly output, otherwise, the power supply unit is further controlled to be electrified and started and then to be electrified and shut down the radar ranging module to acquire ranging data, and the detection result is output after comprehensive analysis processing;
The simplified multi-mode vehicle detector adopts a grading progressive strategy to detect the vehicle; firstly, updating and writing operation firmware, preset conditions and working parameters into a microprocessor through the microwave radio frequency communicator, wherein the preset conditions are divided into A, B, C, D types from big to small according to the fluctuation of a magnetic field; after the updating and writing are successful, the formal operation is started at any time, and only an external matched wireless reset device is needed to activate, the microprocessor can receive a reset command through the microwave radio frequency communicator, perform reset and initialization work, collect magnetic field data under the condition of empty space as a background magnetic field value, and then compare the geomagnetic data collected subsequently with the background magnetic field value in a mean square error manner so as to balance and determine which preset condition is met; then, the microprocessor collects geomagnetic data and visible light data at regular time according to working parameters, and if the preset condition D is met, the geomagnetic data and the visible light data are not further processed; if the preset condition A is met, directly outputting a detection result; if the preset condition B is met, the visible light data is acquired for assistance, if the visible light data is available and effective, the detection result is immediately output, and if the visible light data is unavailable or ineffective, the radar ranging data is further acquired, and then the detection result is output after comprehensive analysis; if the preset condition C is met, collecting visible light data and radar ranging data, and outputting a detection result after comprehensive analysis; in an extreme case, if the berth states determined by the visible light data and the radar ranging data are the same, but are opposite to the berth states determined by the geomagnetic data, the background magnetic field tracking correction processing built in the microprocessor is activated to support the dynamic change of the background magnetic field.
2. A compact multimode vehicle detector as recited in claim 1, wherein: the visible light auxiliary detection circuit at least comprises: a photoresistor and a divider resistor.
3. A compact multimode vehicle detector as recited in claim 1, wherein: the microprocessor is integrated with an ADC and/or a DAC converter on a chip; the operational amplifier is a single power supply CMOS operational amplifier, can be used as a driving amplifier of an A/D converter, and is packaged in a single operational amplifier or multiple operational amplifiers.
4. A compact multimode vehicle detector as recited in claim 1, wherein: the microwave radio frequency communicator and the matched receiving and transmitting antenna thereof are functional components for carrying out wireless communication between the microprocessor and external equipment and/or a back-end system, and the microwave radio frequency communicator refers to a combination of one or more of an NB-IOT module, a Lora/LoraWAN/CLAA module, a 2.45GHz/433MHz wireless transceiver, a 4G/5G wireless communication module, a WiFi/Bluetooth/ANT/ZigBee wireless communication module.
5. A compact multimode vehicle detector as recited in claim 1, wherein: the geomagnetic sensor chip is a linear sensor element for detecting the change of the earth magnetic field by adopting a magneto-resistance technology, and can accurately measure the disturbance change of a vehicle to the geomagnetism in a single-axis or multi-axis direction; the geomagnetic sensor chip includes: anisotropic magnetoresistive AMR sensors, tunneling magnetoresistive TMR sensors, or giant magnetoresistive GMR sensors.
6. A reduced form multimode vehicle detector according to claim 5 wherein: the geomagnetic sensor chip is a TMR linear sensor chip of Jiangsu multidimensional technology Co., ltd, and is TMR2102 or TMR2103.
7. A compact multimode vehicle detector as recited in claim 1, wherein: the radar ranging module is a component which works in a 24GHz or 77GHz frequency band and can perform distance measurement on a short-distance target object and comprises an antenna, a microwave signal processing part and an intermediate frequency signal processing part.
8. A reduced form multimode vehicle detector according to claim 7 wherein: the antenna and microwave signal processing part of the radar ranging module is a 24GHz or 77GHz radar ranging sensor; and the intermediate frequency signal processing part of the radar ranging module can complete target distance calculation by the microprocessor through an interface or output a result to the microprocessor after completing target distance calculation by the built-in MCU.
9. A compact multimode vehicle detector as recited in claim 1, wherein: the power supply unit is used for carrying out power supply management on all power utilization components in the equipment and carrying out power supply output control according to the requirements of the microprocessor, and at least comprises the following components: lithium battery, lithium ion battery capacitor or composite pulse capacitor, voltage stabilizer, MOS tube.
10. A compact multimode vehicle detector as recited in claim 9, wherein: the voltage stabilizer is an RP604 or RP605 series ultralow quiescent current buck-boost DC/DC converter of a photo-electronic equipment limited company.
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| CN112187245A (en) * | 2020-09-21 | 2021-01-05 | 上海艾为电子技术股份有限公司 | Pressure-sensitive detection device, pressure-sensitive detection method, and electronic apparatus |
| CN112820117A (en) * | 2020-12-31 | 2021-05-18 | 武汉慧联无限科技有限公司 | Information processing method, device and system |
| CN116153093A (en) * | 2022-12-28 | 2023-05-23 | 西安建筑科技大学 | A multi-mode geomagnetic vehicle detection system, method, equipment and medium |
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