CN112630770A - Method and device for evaluating service quality of expressway - Google Patents
Method and device for evaluating service quality of expressway Download PDFInfo
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- CN112630770A CN112630770A CN202011390402.9A CN202011390402A CN112630770A CN 112630770 A CN112630770 A CN 112630770A CN 202011390402 A CN202011390402 A CN 202011390402A CN 112630770 A CN112630770 A CN 112630770A
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- 238000011156 evaluation Methods 0.000 claims abstract description 16
- 238000013461 design Methods 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000007433 macroscopic evaluation Methods 0.000 abstract description 3
- 230000006870 function Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 3
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- 238000004891 communication Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
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- 230000003287 optical effect Effects 0.000 description 2
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- 238000013459 approach Methods 0.000 description 1
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- 230000010365 information processing Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
Abstract
The invention provides a method and a device for evaluating the service quality of an expressway, wherein the method comprises the following steps: receiving an input signal Si (v, t), wherein the input signal Si (v, t) represents the motion speed of the ith target measured by the speed measuring equipment at the moment t; calculating road surface parameters at the t moment according to the input signals Si (v, t); calculating an index in an wt window according to the road surface parameters, wherein wt represents the size of the window needing to be observed; and evaluating the current road service quality according to the indexes in the wt window. The invention starts from the perspective of service quality, evaluates the current road condition from the perspective of service quality, improves the evaluation accuracy and provides a more macroscopic evaluation method for management organizations.
Description
Technical Field
The invention belongs to the field of information processing, and particularly relates to a method and a device for evaluating the service quality of an expressway.
Background
The highway belongs to an important traffic facility, and the traffic flow of the highway is characterized by high speed and large traffic capacity. Once the service quality is reduced due to accidents, blockage and the like, the traffic capacity of the highway is greatly influenced. If the service quality degradation is not solved in time, it may cause a continuous deterioration of the road traffic capacity. Therefore, an intelligent method for evaluating the service quality of the highway is needed, which utilizes the existing traffic infrastructure to complete the evaluation of the road service quality and provides a basis for the highway management organization.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for evaluating highway service quality, and mainly aim to provide a more accurate method for evaluating road service quality and provide a basis for highway management organizations.
In a first aspect, an embodiment of the present application provides a method for evaluating service quality of an expressway, including:
receiving an input signal Si (v, t), wherein the input signal Si (v, t) represents the motion speed of the ith target measured by the speed measuring equipment at the moment t;
calculating road surface parameters at the t moment according to the input signals Si (v, t);
calculating an index in an wt window according to the road surface parameters, wherein wt represents the size of the window needing to be observed;
and evaluating the current road service quality according to the indexes in the wt window.
Wherein, the calculating the road surface parameter at the time t according to the input signal Si (v, t) comprises:
setting a set R as { Si (v, t) | t as t, v belongs to [ vmin, vmax ] }, wherein vmin represents the minimum speed which can be detected by the speed measuring equipment, and vmax represents the maximum speed which can be detected by the speed measuring equipment;
when the set R is a non-empty set, calculating the number n (t) of elements in the set R, wherein n (t) represents the number of moving targets meeting a speed interval [ vmin, vmax ] on the road surface at the moment t; calculating the values of v (t),
Wherein, the calculating the index in the wt window according to the road surface parameters, wt represents the size of the window needing to be observed, and comprises the following steps:
let the total wt non-empty sets R within the wt window,
Wherein, the evaluation of the current road service quality according to the indexes in the wt window comprises the following steps:
calculating an evaluation index P:
the km is critical density of road design, the vm is critical speed of road design, the evaluation index P is deviation between current service quality and road design service quality, and the larger the value of P, the worse the service quality is.
The speed measuring equipment is radar or video speed measuring equipment.
Wherein, the parameter wt is 3 fs, fs is the sampling frequency of the velocimetry equipment.
In a second aspect, the present application provides an apparatus for evaluating service quality of a highway, comprising:
the receiving unit is used for receiving an input signal Si (v, t), and the input signal Si (v, t) represents the movement speed of the ith target measured by the speed measuring equipment at the moment t;
a first calculating unit, which is used for calculating road surface parameters at the time t according to the input signal Si (v, t);
the second calculating unit is used for calculating indexes in a wt window according to the road surface parameters, and wt represents the size of the window needing to be observed;
and the evaluation unit is used for evaluating the current road service quality according to the indexes in the wt window.
Wherein the first computing unit is to:
setting a set R as { Si (v, t) | t as t, v belongs to [ vmin, vmax ] }, wherein vmin represents the minimum speed which can be detected by the speed measuring equipment, and vmax represents the maximum speed which can be detected by the speed measuring equipment;
when the set R is a non-empty set, calculating the number n (t) of elements in the set R, wherein n (t) represents the number of moving targets meeting a speed interval [ vmin, vmax ] on the road surface at the moment t; calculating the values of v (t),
In a third aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, and the computer program is used for implementing the steps of any one of the above methods when executed by a processor.
In a fourth aspect, the present application provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the steps of any one of the above methods when executing the program.
The method and the device for evaluating the service quality of the expressway in the embodiment of the application have the following beneficial effects:
the method for evaluating the service quality of the expressway comprises the following steps: receiving an input signal Si (v, t), wherein the input signal Si (v, t) represents the motion speed of the ith target measured by the speed measuring equipment at the moment t; calculating road surface parameters at the t moment according to the input signals Si (v, t); calculating an index in an wt window according to the road surface parameters, wherein wt represents the size of the window needing to be observed; and evaluating the current road service quality according to the indexes in the wt window.
The current monitoring of highways is mainly reflected in the monitoring of accidents. But the incident is only a fraction of the quality of service. For a highway with a small traffic flow, the service quality is not influenced by small accidents. And for nodes of part of roads, the service quality is often reduced due to blockage and the like. Therefore, the invention starts from the perspective of service quality, evaluates the current road condition from the perspective of service quality, improves the evaluation accuracy and provides a more macroscopic evaluation method for management organizations.
Drawings
Fig. 1 is a schematic flow chart of a highway service quality evaluation method according to an embodiment of the application;
fig. 2 is a schematic structural diagram of an apparatus for evaluating highway service quality according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
The present application is further described with reference to the following figures and examples.
In the following description, the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance. The following description provides embodiments of the invention, which may be combined or substituted for various embodiments, and this application is therefore intended to cover all possible combinations of the same and/or different embodiments described. Thus, if one embodiment includes feature A, B, C and another embodiment includes feature B, D, then this application should also be considered to include an embodiment that includes one or more of all other possible combinations of A, B, C, D, even though this embodiment may not be explicitly recited in text below.
The following description provides examples, and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements described without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than the order described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.
The highway belongs to an important traffic facility, and the traffic flow of the highway is characterized by high speed and large traffic capacity. Once the service quality is reduced due to accidents, blockage and the like, the traffic capacity of the highway is greatly influenced. If the service quality degradation is not solved in time, it may cause a continuous deterioration of the road traffic capacity. Therefore, an intelligent method for evaluating the service quality of the highway is needed, which utilizes the existing traffic infrastructure to complete the evaluation of the road service quality and provides a basis for the highway management organization.
As shown in fig. 1, the present invention provides a method for evaluating service quality of an expressway, which can evaluate the service quality of the expressway through an existing speed measuring facility and provide a basis for an expressway management authority. The method for evaluating the service quality of the expressway comprises the following steps: s101, receiving an input signal Si (v, t), wherein the input signal Si (v, t) represents the motion speed of the ith target measured by a speed measuring device at the moment t; s103, calculating road surface parameters at the time t according to the input signal Si (v, t); s105, calculating indexes in an wt window according to the road surface parameters, wherein wt represents the size of the window needing to be observed; and S107, evaluating the current road service quality according to the indexes in the wt window. Each step is described below.
S101, receiving an input signal Si (v, t), wherein the input signal Si (v, t) represents the motion speed of the ith target measured by the speed measuring equipment at the time t.
The ith target is, for example, the ith vehicle. The speed measuring equipment is radar or video speed measuring equipment. The radar velocity measurement mainly utilizes the Doppler Effect (Doppler Effect) principle: when the target approaches the radar antenna, the reflected signal frequency will be higher than the transmitter frequency; conversely, when the target moves away from the antenna, the reflected signal frequency will be lower than the transmitter frequency. Thus, the relative speed of the target and the radar can be calculated by the change value of the frequency (the target flies facing the radar, the Doppler frequency is positive, and when the target flies facing away from the radar, the Doppler frequency is negative).
And S103, calculating road surface parameters at the time t according to the input signal Si (v, t).
In some embodiments, this step comprises: let the set R ═ { Si (v, t) | t ═ t, v ∈ [ vmin, vmax [ ]]Vmin represents the minimum speed which can be detected by the speed measuring equipment, and vmax represents the maximum speed which can be detected by the speed measuring equipment; typically, the specific values of vmin and vmax are determined by the speed sensing equipment in front. In the invention, vmin is appointed>0. When the collection
(empty set) no further processing is performed.
When the set R is a non-empty set, the number n (t) of elements in the set R is calculated, wherein n (t) is # R, the symbol # represents the number of elements in the set, and n (t) represents a coincidence speed interval [ vmin, vmax ] on the road surface at the time t]The number of moving targets; calculating the values of v (t),
v (t) represents the average velocity of all moving objects at time t, and n represents the number of elements in the set R.
And S105, calculating indexes in an wt window according to the road surface parameters, wherein wt represents the size of the window needing to be observed.
In some embodiments, let there be a total of wt non-empty sets R within the wt window,
The parameter wt is chosen according to the sampling frequency fs of the detection device. In general, wt ═ 3 × fs.
And S107, evaluating the current road service quality according to the indexes in the wt window.
In some embodiments, this step comprises:
calculating an evaluation index P:
the km is critical density of road design, the vm is critical speed of road design, the evaluation index P is deviation between current service quality and road design service quality, and the larger the value of P, the worse the service quality is. Therefore, the current road service quality can be evaluated through the P value.
In some embodiments, the speed measuring device is a radar or video speed measuring device. The parameter wt is 3 fs, fs is the sampling frequency of the velocimeter.
The current monitoring of highways is mainly reflected in the monitoring of accidents. But the incident is only a fraction of the quality of service. For a highway with a small traffic flow, the service quality is not influenced by small accidents. And for nodes of part of roads, the service quality is often reduced due to blockage and the like. Therefore, the invention starts from the perspective of service quality, evaluates the current road condition from the perspective of service quality, improves the evaluation accuracy and provides a more macroscopic evaluation method for management organizations.
As shown in fig. 2, the present invention provides an apparatus for evaluating service quality of an expressway, comprising: a receiving unit 201, configured to receive an input signal Si (v, t), where the input signal Si (v, t) represents a motion speed of an ith target measured by a speed measuring device at time t; a first calculating unit 202, configured to calculate a road surface parameter at time t according to the input signal Si (v, t); a second calculating unit 203, configured to calculate an index in an wt window according to the road surface parameter, where wt represents a size of a window to be observed; and the evaluation unit 204 is used for evaluating the current road service quality according to the indexes in the wt window.
Wherein the first computing unit is configured to:
setting a set R as { Si (v, t) | t as t, v belongs to [ vmin, vmax ] }, wherein vmin represents the minimum speed which can be detected by the speed measuring equipment, and vmax represents the maximum speed which can be detected by the speed measuring equipment;
when the set R is a non-empty set, calculating the number n (t) of elements in the set R, wherein n (t) represents the number of moving targets meeting a speed interval [ vmin, vmax ] on the road surface at the moment t; calculating the values of v (t),
In the present application, the embodiment of the device for evaluating the service quality of the highway is basically similar to the embodiment of the method for evaluating the service quality of the highway, and please refer to the introduction of the embodiment of the method for evaluating the service quality of the highway for the relevant points.
It is clear to a person skilled in the art that the solution according to the embodiments of the invention can be implemented by means of software and/or hardware. The "unit" and "module" in this specification refer to software and/or hardware that can perform a specific function independently or in cooperation with other components, where the hardware may be, for example, an FPGA (Field-Programmable Gate Array), an IC (Integrated Circuit), or the like.
Each processing unit and/or module according to the embodiments of the present invention may be implemented by an analog circuit that implements the functions described in the embodiments of the present invention, or may be implemented by software that executes the functions described in the embodiments of the present invention.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to realize the steps of the method for evaluating the service quality of the expressway. The computer-readable storage medium may include, but is not limited to, any type of disk including floppy disks, optical disks, DVD, CD-ROMs, microdrive, and magneto-optical disks, ROMs, RAMs, EPROMs, EEPROMs, DRAMs, VRAMs, flash memory devices, magnetic or optical cards, nanosystems (including molecular memory ICs), or any type of media or device suitable for storing instructions and/or data.
Fig. 3 is a schematic structural diagram of a computer device according to an embodiment of the present application, such as a laptop computer, a desktop computer, a workstation, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers, as shown in fig. 3. The computer device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The computer apparatus of the present application comprises a processor 401, a memory 402, an input device 403 and an output device 404. The processor 401, memory 402, input device 403, and output device 404 may be connected by a bus 405 or otherwise. The memory 402 has stored thereon a computer program which is executable on the processor 401, and the processor 401, when executing the program, performs the above-described highway quality of service evaluation method steps.
The input device 403 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the data processing computer apparatus, such as a touch screen, keypad, mouse, track pad, touch pad, pointer stick, one or more mouse buttons, track ball, joystick or other input device. The output devices 404 may include a display device, auxiliary lighting devices (e.g., LEDs), and haptic feedback devices (e.g., vibrating motors), among others. Display devices may include, but are not limited to, Liquid Crystal Displays (LCDs), Light Emitting Diode (LED) displays, plasma displays, and touch screens.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
All functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement 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 method for evaluating the service quality of an expressway is characterized by comprising the following steps:
receiving an input signal Si (v, t), wherein the input signal Si (v, t) represents the motion speed of the ith target measured by the speed measuring equipment at the moment t;
calculating road surface parameters at the t moment according to the input signals Si (v, t);
calculating an index in an wt window according to the road surface parameters, wherein wt represents the size of the window needing to be observed;
and evaluating the current road service quality according to the indexes in the wt window.
2. The method for evaluating the service quality of the expressway according to claim 1, wherein the calculating of the road surface parameter at the time t according to the input signal Si (v, t) comprises:
setting a set R as { Si (v, t) | t as t, v belongs to [ vmin, vmax ] }, wherein vmin represents the minimum speed which can be detected by the speed measuring equipment, and vmax represents the maximum speed which can be detected by the speed measuring equipment;
when the set R is a non-empty set, calculating the number n (t) of elements in the set R, wherein n (t) represents the number of moving targets meeting a speed interval [ vmin, vmax ] on the road surface at the moment t; calculating the values of v (t),
3. The method for evaluating the service quality of the expressway according to claim 2, wherein the calculating an index in an wt window according to the road surface parameter, wt representing the size of a window to be observed, comprises:
let the total wt non-empty sets R within the wt window,
4. The method for evaluating the service quality of the expressway according to claim 3, wherein the evaluating the current road service quality according to the indexes in the wt window comprises the following steps:
calculating an evaluation index P:
the km is critical density of road design, the vm is critical speed of road design, the evaluation index P is deviation between current service quality and road design service quality, and the larger the value of P, the worse the service quality is.
5. The method for evaluating the quality of service of the highway according to any one of claims 1-4, wherein the speed measuring equipment is radar or video speed measuring equipment.
6. The method for evaluating the service quality of the expressway according to any one of claims 1 to 4, wherein the parameter wt-3 fs, fs is a sampling frequency of a speed measuring device.
7. An apparatus for evaluating service quality of a highway, comprising:
the receiving unit is used for receiving an input signal Si (v, t), and the input signal Si (v, t) represents the movement speed of the ith target measured by the speed measuring equipment at the moment t;
a first calculating unit, which is used for calculating road surface parameters at the time t according to the input signal Si (v, t);
the second calculating unit is used for calculating indexes in a wt window according to the road surface parameters, and wt represents the size of the window needing to be observed;
and the evaluation unit is used for evaluating the current road service quality according to the indexes in the wt window.
8. The apparatus according to claim 7, wherein the first calculating unit is configured to:
setting a set R as { Si (v, t) | t as t, v belongs to [ vmin, vmax ] }, wherein vmin represents the minimum speed which can be detected by the speed measuring equipment, and vmax represents the maximum speed which can be detected by the speed measuring equipment;
when the set R is a non-empty set, calculating the number n (t) of elements in the set R, wherein n (t) represents the number of moving targets meeting a speed interval [ vmin, vmax ] on the road surface at the moment t; calculating the values of v (t),
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1-6 are implemented when the program is executed by the processor.
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