CN113129641A - Parking space vehicle detection device - Google Patents
Parking space vehicle detection device Download PDFInfo
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- CN113129641A CN113129641A CN202110427258.XA CN202110427258A CN113129641A CN 113129641 A CN113129641 A CN 113129641A CN 202110427258 A CN202110427258 A CN 202110427258A CN 113129641 A CN113129641 A CN 113129641A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/14—Traffic control systems for road vehicles indicating individual free spaces in parking areas
- G08G1/145—Traffic control systems for road vehicles indicating individual free spaces in parking areas where the indication depends on the parking areas
Abstract
The present invention provides a parking space vehicle detection device, including: a light emitting array for emitting a light signal; a shielding detector array for receiving light signals reflected by an obstacle or a vehicle; a vehicle detector array for receiving light signals reflected by a vehicle; wherein, the light emission array, shelter from the position relation of detector array and vehicle detector array and satisfy: under the condition that there is the vehicle above the parking stall, the light signal is sheltered from detector array and vehicle detector array and is received after the vehicle bottom reflects, has the barrier that is less than vehicle chassis height above the parking stall under the condition, the light signal can only be sheltered from detector array and is received after the barrier reflects. The device has the advantages of no influence of environmental background light, small weight power consumption, high test sensitivity, electromagnetic interference resistance and the like, has no damage to the detected vehicle, and can be widely applied to various urban parking lots.
Description
Technical Field
The invention relates to the technical field of space light detection, in particular to a parking space vehicle detection device.
Background
The space light detection technology has the advantages of high detection sensitivity, low equipment cost, small power consumption and volume, electromagnetic interference resistance and the like, and is widely applied to the detection of obstacles in scenes such as elevators, automatic doors, industrial production lines and the like.
Utilize space light technique to realize parking stall vehicle detection, mainly face two key problems, on the one hand environment sunlight can lead to the fact stronger influence to the communication, and on the other hand is the parking area, and especially outdoor parking area environmental pollutant is more, needs to solve the environmental pollutant and shelters from and lead to the police or the inefficacy problem of device wrong report.
Disclosure of Invention
Technical problem to be solved
In view of the above technical problems, the present invention provides a parking space vehicle detection apparatus, which is used to at least partially solve the above technical problems.
(II) technical scheme
The present invention provides a parking space vehicle detection device, including: a light emitting array 1 for emitting a light signal; a shielding detector array 2 for receiving light signals reflected by an obstacle or a vehicle; a vehicle detector array 3 for receiving light signals reflected by the vehicle; wherein, the position relation of the light emission array 1, the shielding detector array 2 and the vehicle detector array 3 satisfies: under the condition that there is the vehicle above the parking stall, the light signal is sheltered from detector array 2 and vehicle detector array 3 and is received after the vehicle bottom reflection, has the barrier that is less than vehicle chassis height above the parking stall under the condition, the light signal can only be sheltered from detector array 2 and receive after being reflected by the barrier.
Optionally, the light emitting array 1 is composed of at least one low-power light emitting unit, the shielding detector array 2 is composed of at least one shielding detecting unit and an amplifying circuit, and the vehicle detector array 3 is composed of at least one vehicle detecting unit and an amplifying circuit, wherein the light emitting units and the shielding detecting units are arranged in a cross manner to form a transceiving hybrid array.
Optionally, the parking space vehicle detecting device further includes: and the processing unit 4 is used for transmitting a specific sequence to drive the light emitting array 1 to emit light signals, and judging whether a vehicle or an obstacle exists above the parking space vehicle detection device according to output signals of the blocking detector array 2 and the vehicle detector array 3.
Optionally, the processing unit 4 is further configured to perform analog-to-digital conversion on output signals of the occlusion detector array 2 and the vehicle detector array 3, perform correlation test on the output signals and the optical signals, and determine the strength of the signals received by the occlusion detector array 2 and the vehicle detector array 3 according to the correlation test result.
Optionally, the occlusion detection unit and the vehicle detection unit include optical detectors, and a narrow-band optical filter matched with the wavelength of the optical signal is installed at the front ends of the optical detectors.
Optionally, the detection sensitivity of the occlusion detector array 2 is less than or equal to the detection sensitivity of the vehicle detector array 3; the magnification of the occlusion detector array 2 is lower than that of the vehicle detector array 3.
Optionally, the light source of the light emitting array 1 is any one of ultraviolet light, visible light or near infrared band light, and the modulation bandwidth is greater than or equal to 100 Hz.
Optionally, the parking space vehicle detecting device further includes: a power supply unit 5 and a wireless output unit 6; the power supply unit 5 comprises a power supply device which is charged periodically or a power supply device which is composed of a storage battery and a solar panel and does not need to be charged, and is used for supplying power to the parking space vehicle detection device when no external power supply exists; the wireless output unit 6 comprises a space optical communication module or a microwave wireless communication module and is used for transmitting information to an upper computer when no external wired data connection exists.
Alternatively, the core processing chip of the processing unit 4 comprises any type of digital chip; the device for realizing the analog-to-digital conversion comprises a built-in ADC or an independent ADC element integrated on a digital chip, wherein at least one ADC is adopted to digitize each path of output signal, or one ADC is adopted to process at least one path of output signal in a time division multiplexing mode.
Optionally, at least one path of signals output by the shielding detector array 2 and the vehicle detector array 3 is summed into one path of output by a summing analog circuit, or the signal of each detector is amplified and output respectively.
(III) advantageous effects
The invention provides a parking space vehicle detection device based on a space light technology, which solves the problem that an environmental pollutant shields a detector by adding a shielding detector array, when the device cannot normally work due to the shielding devices such as rain, snow and pollutants, because the position of a light emitting array is close to that of the shielding detector array and the distance between the vehicle detector array and the light emitting array is far, the signal intensity detected by the shielding detector array after a light signal sent by the light emitting array is reflected by the environmental pollutant is far greater than that detected by the vehicle detector array, even the light signal reflected by the environmental pollutant cannot be detected by the vehicle detector array, and the device can report an abnormal signal at the moment, so that the device can avoid misjudging that a parking space has a vehicle.
The similarity of the signals output by the shielding detector array and the vehicle detector array and the optical signals sent by the light emitting array is checked through the processing unit, if the similarity is high, the signals received by the shielding detector array and the vehicle detector array are the optical signals sent by the light emitting array after the optical signals are reflected by environmental pollutants or vehicles; if the similarity is low, it indicates that the received signal is other light signals (such as natural light) in the environment. Therefore, the invention can eliminate the influence of the ambient background light on the detection sensitivity and has stronger detection capability.
In addition, the optical signal is used as a detection medium, other electromagnetic signals in the environment cannot be influenced in the working process, the electromagnetic signal is not influenced by environment electromagnetism, the electromagnetic compatibility characteristic is good, and when the wireless communication unit is not included, the electromagnetic signal detection device can be applied to electromagnetic sensitive environments such as airports, radar stations and the like.
Drawings
Fig. 1 schematically shows a composition diagram of a parking space vehicle detection apparatus according to an embodiment of the present invention;
FIG. 2 schematically illustrates a light emission array, an occlusion detector array, and a vehicle detector array layout according to an embodiment of the invention;
FIG. 3 schematically illustrates a light emission array, an occlusion detector array, and a vehicle detector array layout according to another embodiment of the invention.
[ description of reference ]
1-light emitting array
2-occlusion detector array
3-vehicle detector array
4-processing unit
5-Power supply Unit
6-Wireless output Unit
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It should be noted that in the drawings or description, the same drawing reference numerals are used for similar or identical parts. Features of the embodiments illustrated in the description may be freely combined to form new embodiments without conflict, and each claim may be individually referred to as an embodiment or features of the claims may be combined to form a new embodiment, and in the drawings, the shape or thickness of the embodiment may be enlarged and simplified or conveniently indicated. Further, elements or implementations not shown or described in the drawings are of a form known to those of ordinary skill in the art. Additionally, while exemplifications of parameters including particular values may be provided herein, it is to be understood that the parameters need not be exactly equal to the respective values, but may be approximated to the respective values within acceptable error margins or design constraints.
Unless a technical obstacle or contradiction exists, the above-described various embodiments of the present invention may be freely combined to form further embodiments, which are within the scope of the present invention.
Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of preferred embodiments of the present invention and should not be construed as limiting the invention. The dimensional proportions in the figures are merely schematic and are not to be understood as limiting the invention.
Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
Fig. 1 schematically shows a composition diagram of a parking space vehicle detection apparatus according to an embodiment of the present invention, and as shown in fig. 1, the parking space vehicle detection apparatus includes, for example:
and a light emitting array 1 for emitting a light signal.
And a shielding detector array 2 for receiving the light signal reflected by the obstacle or the vehicle.
And a vehicle detector array 3 for receiving the light signal reflected by the vehicle.
Wherein, the position relation of the light emission array 1, the shielding detector array 2 and the vehicle detector array 3 satisfies: under the condition that there is the vehicle above the parking stall, the light signal is sheltered from detector array 2 and vehicle detector array 3 and is received after the vehicle bottom reflects, and under the condition that there is the barrier above the parking stall, the light signal can only be received by sheltering from detector array 2 after being reflected by the barrier, and wherein, the height of this barrier is less than the terrain clearance of vehicle chassis.
FIG. 2 schematically illustrates a light emission array, an occlusion detector array, and a vehicle detector array layout according to an embodiment of the invention.
FIG. 3 schematically illustrates a light emission array, an occlusion detector array, and a vehicle detector array layout according to another embodiment of the invention.
According to the embodiment of the invention, the light emitting array 1 is composed of at least one low-power light emitting unit, the shielding detector array 2 is composed of at least one shielding detecting unit and an amplifying circuit, and the vehicle detector array 3 is composed of at least one vehicle detecting unit and an amplifying circuit. As shown in fig. 2 and 3, the light emitting unit and the shielding detecting unit may be arranged in a cross manner to form a transceiver hybrid array, for example. The shielding detector array 2 is installed near the light emitting array 1 for detecting whether there is an obstacle shielding above the parking space vehicle detecting device, and preferably, the spatial distance between the two is not more than 10 cm, for example. The vehicle detector array 3 is installed at a position away from the light emitting array 1 for detecting whether a vehicle is parked above the parking space vehicle detecting device, preferably, at a spatial distance of not less than 10 cm, for example. The blocking detector is located close to the light source and the vehicle detector is located far from the light source, so that when the blocking object (such as dirt, rain and snow) is close, the light emitted by the light emitting array 1 is reflected in the close vicinity, and thus can only be received by the blocking detector array 2.
According to the embodiment of the invention, the output power of the light emitting array 1 affects the endurance time and the detection sensitivity, and under the condition of wired power supply, for example, a high-power light emitting unit can be selected to improve the detection accuracy. In terms of the number of light emitting units, it is preferable to replace a single high-power light emitting unit with a plurality of low-power light emitting units, so that the influence of environmental pollutant shielding on the performance of the device can be reduced, for example, after the plurality of light emitting units are partially shielded, the device still can work normally.
According to an embodiment of the present invention, the parking space vehicle detection apparatus further includes, for example: and the processing unit 4 is used for transmitting a specific sequence to drive the light emitting array 1 to emit light signals, judging whether a vehicle or an obstacle exists above the parking space vehicle detection device according to output signals of the shielding detector array 2 and the vehicle detector array 3, and outputting information to the upper computer through the wired signal transmission module or the wireless output unit 6. The specific sequence needs to satisfy the characteristic that the autocorrelation calculation is low in intensity at the position T ≠ 0, and a pseudo-random code sequence generated based on a primitive polynomial can be adopted, but is not limited thereto. The working mode of the device can be, for example: the processing unit 4 sends known specific optical signals (such as specific sequences or optical signals with modulated specific sequences) through the light emitting array 1 under the control of an upper computer or an internal program, and when a vehicle is parked above a parking space, the optical signals are received by the shielding detector array 2 and the vehicle detector array 3 after being reflected by the bottom of the vehicle; when pollutants and the like in the environment form shielding near the light source, the light signals reflected by the pollutants are only received by the shielding detector array 2; when no shielding and no vehicle exists above the device, no signal is received by the two detector arrays; and the processing unit determines the vehicle condition above the device according to the signal output conditions of the two detectors and outputs the vehicle condition to the upper computer.
According to the embodiment of the invention, the processing unit 4 detects whether a pollutant or a vehicle exists above the device, and mainly determines the existence of the pollutant or the vehicle according to the intensity and the intensity change of the output signals of the two detector arrays. When the output signals of the vehicle detector array 3 and the shielding detector array 2 are simultaneously enhanced, the situation that an obstacle appears at a higher position is indicated, and the reflected light signals can simultaneously irradiate the two detector arrays. When only the shielding detector array 2 receives the optical signal, it indicates that the position of the obstacle is low, i.e. the obstacle is a ground pollutant. Since the occlusion detector array 2 is closer to the light emitting array 1, the signal it receives when the vehicle is parked will be stronger. In order to detect the signal strength more accurately and prevent the gain saturation phenomenon from occurring, the amplification factor of the shielding detector array 2 should be appropriately lower than that of the vehicle detector array 3.
According to the embodiment of the present invention, the signal processing method of the processing unit 4 includes, for example, performing analog-to-digital conversion on the signals output by the two detector arrays, performing correlation test on the optical signals transmitted by the light emitting array 1, and determining the received signal strength according to the correlation of the transmitted and received signals. If the correlation is strong, it indicates that the signals received by the shielding detector array 2 and the vehicle detector array 3 are optical signals obtained by reflecting the optical signals sent by the light emitting array 1 by environmental pollutants or vehicles, and at this time, it is determined that the signals received by the shielding detector array 2 and the vehicle detector array 3 are optical signals sent by the light emitting array 1, and the received signal intensity is high; if the correlation is weak, the received signal is the other light signals (such as natural light) in the environment, and at this time, it is determined that the shielding detector array 2 and the vehicle detector array 3 receive the external light signal, so that the received signal intensity is low, and the influence of external background light on the detection device is avoided. The correlation test may take the following forms, for example but not limited to: the strength x of the transmitted signal is cross-correlated with the strength y of the received signal to calculate sigma xy/sigma x2/∑y2If the calculated result is greater than a threshold, the two are considered to be related, and at this time, the detector receives a correct optical signal. The core processing chip can be any type of digital chip such as a single chip microcomputer, an FPGA, an ARM and the like. The analog-to-digital conversion can be realized by a built-in ADC integrated by a digital chip, can also be realized by an independent ADC element, and can be realized by a plurality of ADCs respectively carrying out digital conversion on each path of signalAlternatively, 1 ADC may be used to process several signals in a time division multiplexing manner.
According to the embodiment of the present invention, from the viewpoint of cost, the light emitting array 1 should preferably use an infrared band in an outdoor environment; in an indoor underground parking lot, preferably, infrared or visible light bands should be used. The large-angle oblique incident light signal is difficult to be received by the detector after being reflected, so the emergent light signal needs to be properly collimated to improve the light utilization rate.
According to the embodiment of the invention, the shielding detector array 2 and the vehicle detector array 3 are composed of a light detector (for example, an infrared light detector) and an amplifying circuit, and a narrow-band filter matched with the wavelength of the emitted light source is required to be installed at the front end of each detector to prevent the sunlight from being saturated, wherein the sensitivity of the shielding detector array 2 is smaller than or equal to that of the vehicle detector array 3 to prevent the signal receiving of the shielding detector array 2 from being over-saturated. The signals output by the two arrays can be respectively added into one path of output through the addition analog circuit, and the signals of the detectors can also be directly amplified and then output.
According to an embodiment of the present invention, the parking space vehicle detection apparatus further includes, for example: the power supply unit 5 may be, for example, a power supply device that is periodically charged, or a power supply device that is not required to be charged and is composed of a storage battery and a solar panel. This part is an unnecessary unit for supplying power to the device when the device is installed in an environment without external power supply. The wireless output unit 6 may be, for example, a space optical communication module or a microwave wireless communication module. The part is also an unnecessary unit and is used for outputting a detection result to an upper computer when the device is installed under the condition of no external wired data connection.
In summary, the embodiments of the present invention provide a parking space vehicle detection apparatus based on spatial light technology. The problem that the environmental pollutants shield the detectors is solved by adding the shielding detector array, and the situation that the parking space is occupied by the vehicle is avoided being judged by mistake. By adopting low-cost infrared light or visible light, whether vehicles exist in the urban parking space can be detected at low cost. The device has the advantages of no influence of environmental background light, small weight power consumption, high test sensitivity, electromagnetic interference resistance and the like, has no damage to the detected vehicle, and can be widely applied to various urban parking lots.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A parking space vehicle detection device, comprising:
a light emitting array (1) for emitting a light signal;
a shielding detector array (2) for receiving light signals reflected by an obstacle or vehicle;
a vehicle detector array (3) for receiving light signals reflected by the vehicle;
wherein the light emission array (1), the occlusion detector array (2) and the vehicle detector array (3) are in a positional relationship satisfying: under the condition that a vehicle is arranged above a parking space, the light signals are received by the shielding detector array (2) and the vehicle detector array (3) after being reflected by the bottom of the vehicle, and under the condition that an obstacle lower than the height of a vehicle chassis is arranged above the parking space, the light signals are only received by the shielding detector array (2) after being reflected by the obstacle.
2. The parking space vehicle detection device according to claim 1, wherein the light emitting array (1) is composed of at least one low power light emitting unit, the shielding detector array (2) is composed of at least one shielding detection unit and an amplifying circuit, and the vehicle detector array (3) is composed of at least one vehicle detection unit and an amplifying circuit, wherein the light emitting unit and the shielding detection unit are arranged in a cross manner to form a transmitting-receiving hybrid array.
3. The parking space vehicle detection apparatus according to claim 1, characterized by further comprising:
and the processing unit (4) is used for transmitting a specific sequence to drive the light emitting array (1) to emit the light signals, and judging whether a vehicle or an obstacle exists above the parking space vehicle detection device according to output signals of the shielding detector array (2) and the vehicle detector array (3).
4. Parking space vehicle detection apparatus according to claim 3, wherein the processing unit (4) is further configured to perform a correlation check on the optical signal after performing analog-to-digital conversion on the output signals of the occlusion detector array (2) and the vehicle detector array (3), and determine the intensity of the signals received by the occlusion detector array (2) and the vehicle detector array (3) according to the correlation check result.
5. The parking space vehicle detection device according to claim 2, wherein the blocking detection unit and the vehicle detection unit include a photodetector, and a narrow-band filter matched with a wavelength of the optical signal is mounted at a front end of the photodetector.
6. Parking space vehicle detection apparatus according to claim 1, wherein the detection sensitivity of the occlusion detector array (2) is equal to or less than the detection sensitivity of the vehicle detector array (3);
the magnification of the shielding detector array (2) is lower than that of the vehicle detector array (3).
7. The parking space vehicle detection device according to claim 1, wherein the light source of the light emitting array (1) is any one of ultraviolet light, visible light or near infrared band light, and the modulation bandwidth is greater than or equal to 100 Hz.
8. The parking space vehicle detection apparatus according to claim 1, characterized by further comprising:
a power supply unit (5) and a wireless output unit (6);
the power supply unit (5) comprises a power supply device which is charged periodically or a power supply device which is composed of a storage battery and a solar panel and does not need to be charged, and is used for supplying power to the parking space vehicle detection device when no external power supply exists;
the wireless output unit (6) comprises a space optical communication module or a microwave wireless communication module and is used for transmitting information to an upper computer when no external wired data connection exists.
9. Parking space vehicle detection apparatus according to claim 4, wherein the core processing chip of the processing unit (4) comprises any type of digital chip;
the device for realizing the analog-to-digital conversion comprises a built-in ADC or an independent ADC element integrated on a digital chip, wherein at least one ADC is adopted to digitize each path of output signals, or one ADC is adopted to process at least one path of output signals in a time division multiplexing mode.
10. The parking space vehicle detection device according to claim 5, wherein at least one path of signals output by the occlusion detector array (2) and the vehicle detector array (3) is added to be output by an addition analog circuit, or the signal of each detector is amplified and output respectively.
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| CN202110427258.XA CN113129641B (en) | 2021-04-20 | 2021-04-20 | Parking space vehicle detection device |
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| CN202110427258.XA CN113129641B (en) | 2021-04-20 | 2021-04-20 | Parking space vehicle detection device |
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