CN104506260A - Device, system and method for measuring field intensity of ETC (Electronic Toll Collection) roadside equipment and calibrating communication region - Google Patents
Device, system and method for measuring field intensity of ETC (Electronic Toll Collection) roadside equipment and calibrating communication region Download PDFInfo
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Abstract
The invention relates to the technical field of measurement and discloses a device for measuring field intensity of ETC (Electronic Toll Collection) roadside equipment and calibrating a communication region. The device comprises a radio frequency signal measurement module, a measurement control module, a self-positioning module and a motion control module; the radio frequency signal measurement module, the self-positioning module and the motion control module are all connected with the measurement control module; the self-positioning module is used for sending a current position to the measurement control module; the measurement control module is used for controlling the radio frequency signal measurement module to be communicated with the roadside equipment so as to measure signal intensity of a radio frequency signal sent by the roadside equipment at a current measurement point and controlling the motion control module to drive a calibrating device to automatically move to a next measurement point. The invention also discloses a calibrating system and a calibrating method. According to the invention, automation of signal measurement and region calibration of the RSU (roadside equipment) is implemented and labor intensity of implementing ETC lane engineering is reduced.
Description
Technical field
The present invention relates to field of measuring technique, particularly a kind of ETC roadside device field strength measurement and communication zone caliberating device, system and method.
Background technology
Electronic charging system without parking ETC refers to that vehicle can realize the Fare Collection System of noncash automatic fee by not needing during expressway tol lcollection square to stop.Described ETC system comprises roadside device RSU and mobile unit OBU, carries out bidirectional data communication between RSU and OBU by 5.8GHz radiofrequency signal.Communication range between RSU and OBU need control in the ETC special toll collection track corresponding with RSU, and the general width of communication zone is 3.5m ~ 4m, and length is 6m ~ 15m.Communication zone controls to rely on modulation RSU directional antenna radiation power and angle of radiation to realize.Need to measure RSU efficient communication region and demarcate in ETC construction process.RSU communication zone method of measurement conventional at present has following several.
First method, uses OBU to carry out communication zone demarcation to RSU:
Use tripod to fix OBU, ensure that OBU is in normal operating conditions; Mobile tripod makes OBU be moved by the export-oriented communication zone center of RSU communication zone from different directions, record OBU from stable location point of concluding the business with RSU; Measure and record several location points, being generally 12, these location points being depicted and forms RSU communication zone figure.RSU communication zone figure can be used as the foundation of RSU parameter adjustment.
Adjustment RSU parameter also repeats above test process, until RSU communication meets engineer applied requirement with region, namely completes RSU communication zone and demarcates.
The shortcoming of the method is:
1) use OBU product as testing apparatus, OBU individual difference introduces very large test error;
2) only can summary description RSU communication zone edge, field intensity distribution situation in communication zone cannot be described;
3) only can carry out observational measurement, can not quantificational description be realized.
Second method, uses frequency spectrograph to carry out communication zone measurement to RSU field strength distribution and realizes communication zone and demarcate:
Use 5.8G dedicated antenna plate to connect frequency spectrograph, on the calibration point below mobile frequency spectrograph and antenna plate to tested RSU antenna, measure the carrier signal strength of different calibration point.Calibration point generally becomes distributed in grid, and covers complete RSU communication zone.Pointwise record calibration point coordinate and signal strength signal intensity in test process, complete after all calibration points are measured and form field intensity tables of data.RSU field strength distribution can be analyzed by tables of data, calculate communication zone scope, and as RSU parameter adjustment foundation.
Adjustment RSU parameter also repeats above test process, until RSU communication meets engineer applied requirement with region, namely completes RSU communication zone and demarcates.
The shortcoming of the method is:
1) rely on special equipment, cost is high, and operation easier is large, not easily promotes;
2) artificial point-to-point measurement, labour intensity is large;
3) follow-up data processing procedure is loaded down with trivial details.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: the ETC roadside device field strength measurement and the communication zone that how to realize automation are demarcated.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of ETC roadside device field strength measurement and communication zone caliberating device, it is characterized in that, comprise: radiofrequency signal measurement module, Survey control module, autonomous locating module and motion-control module, described radiofrequency signal measurement module, autonomous locating module are all connected described Survey control module with motion-control module;
Described autonomous locating module is used for current location to be sent to described Survey control module; Described Survey control module communicates with described roadside device for controlling radiofrequency signal measurement module, to measure radiofrequency signal that roadside device the sends signal strength signal intensity at current measurement point, and control described motion-control module and drive described caliberating device automatically to move to next measurement point.
Wherein, described radiofrequency signal measurement module comprises: testing standard antenna, measuring unit and communication unit, be connected by RF connection between described testing standard antenna and measuring unit, the radiofrequency signal that described testing standard antenna sends for receiving roadside device, is transferred to described measuring unit by RF connection; The radiofrequency signal transmitted is converted to digital signal by described measuring unit carries out measuring and measurement result being transferred to communication unit; Described communication unit receives the control command of Survey control module test result to be transferred out.
Wherein, described testing standard Antenna Operation possesses constant gain in the 5.8GHz frequency range meeting Chinese ETC national Specification.
Wherein, described autonomous locating module comprises: satellite positioning module and inertial navigation module, described satellite positioning module connects inertial navigation module, satellite positioning module for obtaining described caliberating device current location, the relative position change of inertial navigation module for obtaining described caliberating device displacement and causing; Described satellite positioning module connects Survey control module, for described current location is sent to Survey control module;
Wherein, described motion-control module comprises: decision-making module and Executive Module, and described decision-making module connects Survey control module, receives the measuring route that Survey control module sends, and controls Executive Module described caliberating device is moved by measuring route; Or receive the movement instruction of Survey control module transmission, and according to movement instruction control Executive Module, described caliberating device is moved.
Present invention also offers a kind of ETC roadside device field strength measurement and communication zone calibration system, comprise: measuring terminals and the caliberating device described in above-mentioned any one, described measuring terminals sends RSU parameter preset to described roadside device, to configure described roadside device, and control described caliberating device and measure at the measurement point preset the radio-frequency (RF) signal strength that described roadside device sends; The radio-frequency (RF) signal strength that described measuring terminals obtains measurement point position and measures at this measurement point, to form communication zone areal map and field intensity map; If the communication zone areal map obtained has reached use standard-required, in the deviation range allowed, then complete demarcation, otherwise again measured, until reach use standard-required according to deviation size adjustment RSU parameter preset.
Wherein, described measuring terminals connects described roadside device, and described measuring terminals forwards described measuring route to described caliberating device by described roadside device, moves to next measurement point to make described caliberating device by described measuring route from a measurement point; Or forward mobile control command to described caliberating device, control described caliberating device and move to next measurement point from a measurement point.
Wherein, described measuring terminals connects described caliberating device, and described measuring terminals forwards described RSU parameter preset to described roadside device by described caliberating device.
Present invention also offers a kind of scaling method based on above-mentioned ETC roadside device field strength measurement and communication zone calibration system, comprising:
S1: field strength measurement parameter and RSU parameter preset are set by measuring terminals, described field strength measurement parameter comprises: zone boundary to be measured, field strength measurement point distribution density, certainty of measurement requirement, communication zone field-strength standard, communication zone spotting scope and permissible variation, and described measuring terminals is according to field strength measurement Selecting parameter measurement point;
S2: tested roadside device is with the radiofrequency signal of described RSU parameter preset transmission test;
S3: measurement result according to the distribution point-to-point measurement radio-frequency (RF) signal strength of measurement point, and is sent to described measuring terminals by described caliberating device;
S4: measuring terminals processes measurement data, forms complete field intensity map according to measurement point position and in the radio-frequency (RF) signal strength that this measurement point described is measured; On the basis of field intensity map, filter out the field strength distribution region of field intensity size higher than communication standard, obtain communication zone areal map;
S5: if the communication zone areal map obtained does not reach use standard, deviation is greater than described permissible variation, then readjust RSU parameter preset according to deviation size, then repeats step S2 ~ S4, until measure the communication zone areal map drawn to reach use standard, deviation is less than described permissible variation.
Wherein, the radiofrequency signal of the test described in step S2 is: a kind of signal in carrier signal, full 0 test signal, complete 1 test signal, 14kHz wake-up signal, DSRC data frame signal or the combination of several signal.
Wherein, described in step S3, measurement result comprises: measurement point numbering, measurement point coordinate and signal strength signal intensity.
Wherein, in step S3, the move mode that described caliberating device measures radio-frequency (RF) signal strength according to the distribution point-to-point measurement radio-frequency (RF) signal strength of measurement point comprises one of the following two kinds:
Autonomous mode: caliberating device initiatively completes measuring position adjustment according to the measuring route that described measuring terminals is planned in advance and confirms;
Passive move mode: measuring terminals obtains the position of described caliberating device by location, and moved by order control caliberating device.
Wherein, described measurement path planning principle is: shortest path or central area preferential.
Wherein, the RSU parameter preset described in step S5 adjusts, and comprising: the one in transmitting power, radiation direction and half-power angle or combination in any.
Wherein, if when the antenna of tested roadside device possesses multiple configurable communication region, by step S1 ~ S5 each communication zone measured one by one and demarcate.
(3) beneficial effect
ETC roadside device field strength measurement of the present invention and communication zone caliberating device achieve RSU signal measurement and region labeling automation, alleviate ETC track engineering construction labour intensity.
Accompanying drawing explanation
Fig. 1 is a kind of ETC roadside device field strength measurement and the communication zone caliberating device structural representation of the embodiment of the present invention;
Fig. 2 is a kind of ETC roadside device field strength measurement and the communication zone calibration system structural representation of the embodiment of the present invention;
Fig. 3 is another kind of ETC roadside device field strength measurement and the communication zone calibration system structural representation of the embodiment of the present invention;
Fig. 4 is another ETC roadside device field strength measurement and the communication zone calibration system structural representation of the embodiment of the present invention;
Fig. 5 is a kind of ETC roadside device field strength measurement and the communication zone scaling method flow chart of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
The ETC roadside device field strength measurement of the embodiment of the present invention and communication zone caliberating device 100, as shown in Figure 1, comprising: Survey control module 110, radiofrequency signal measurement module 120, autonomous locating module 130 and motion-control module 140.Radiofrequency signal measurement module 120, autonomous locating module 130 are all connected Survey control module 110 with motion-control module 140.
Autonomous locating module 130 is for being sent to Survey control module 110 by current location, Survey control module 110 communicates with roadside device (i.e. RSU) for controlling radiofrequency signal measurement module 120, to measure radiofrequency signal that roadside device the sends signal strength signal intensity at current measurement point, and controlled motion control module 140 drives caliberating device 100 to move to next measurement point.
In the present embodiment, radiofrequency signal measurement module 120 comprises: testing standard antenna, measuring unit and communication unit.Be connected by RF connection between testing standard antenna and measuring unit, the radiofrequency signal that testing standard antenna sends for receiving roadside device, and be transferred to measuring unit by RF connection.The radiofrequency signal transmitted is converted to digital signal by measuring unit carries out measuring and measurement result being transferred to communication unit.Communication unit communicates with Survey control module on the one hand, and to receive the control command of Survey control module, test data test result also transfers out by communication unit on the other hand, transfers to the measuring terminals for statistics.Wherein, testing standard Antenna Operation possesses constant gain in the 5.8GHz frequency range meeting Chinese ETC national Specification.
In the present embodiment, autonomous locating module 130 comprises: satellite positioning module and inertial navigation module.Satellite positioning module connects inertial navigation module, satellite positioning module is for obtaining described caliberating device current absolute location information, the relative position change (verifying whether current movement meets expection, whether rationally) that inertial navigation module causes for obtaining described caliberating device displacement.Satellite positioning module connects Survey control module 110, for current location information is sent to Survey control module 110.
In the present embodiment, motion-control module 140 comprises: decision-making module and Executive Module.Decision-making module connects Survey control module, receives the measuring route that Survey control module sends, and controls Executive Module described caliberating device is moved by measuring route; Or receive the movement instruction that Survey control module sends, and control Executive Module according to movement instruction and make caliberating device carry out position according to certain orientation to move.Executive Module can be wheeled or caterpillar motion.
Present invention also offers a kind of ETC roadside device field strength measurement and communication zone calibration system, comprise: measuring terminals and above-mentioned caliberating device, measuring terminals sends RSU parameter preset to roadside device, to configure roadside device, and control described caliberating device and measure at the measurement point preset the radio-frequency (RF) signal strength that described roadside device sends.The radio-frequency (RF) signal strength that described measuring terminals obtains measurement point position and measures at this measurement point, to form communication zone areal map and field intensity map.If the communication zone areal map obtained has reached use standard-required, in the deviation range allowed, then complete demarcation, otherwise again measured, until reach use standard-required according to deviation size adjustment RSU parameter preset.
As shown in Figure 2, for a kind of connected mode of calibration system, measuring terminals 300 link road side apparatus 200, measuring terminals 300 forwards measuring route to caliberating device 100 by roadside device 200, moves to next measurement point to make caliberating device 100 by measuring route from a measurement point; Or forward mobile control command to caliberating device 100, control caliberating device 100 and move to next measurement point from a measurement point.Wherein, caliberating device 100 receives by the communication unit of radiofrequency signal measurement module the information forwarded by roadside device 200.
As shown in Figures 3 and 4, be other two kinds of connected modes of calibration system, measuring terminals 300 connects caliberating device 100, and measuring terminals 300 forwards RSU parameter preset to roadside device 200 by caliberating device 100.Be the mode of wired connection in Fig. 3, Fig. 4 is the mode of wireless connections, as 2.4G wireless connections.
Present invention also offers a kind of scaling method based on above-mentioned ETC roadside device field strength measurement and communication zone calibration system, flow process as shown in Figure 5, comprising:
Step S1: arrange field strength measurement parameter and RSU parameter preset by measuring terminals, described field strength measurement parameter comprises: zone boundary to be measured, field strength measurement point distribution density, certainty of measurement requirement, communication zone field-strength standard, communication zone spotting scope and permissible variation.Described measuring terminals is according to field strength measurement Selecting parameter measurement point.。
Step S2: tested roadside device is with the radiofrequency signal of described RSU parameter preset transmission test.Wherein, the radiofrequency signal of test is: a kind of signal in carrier signal, full 0 test signal, complete 1 test signal 14kHz wake-up signal, DSRC data frame signal or the combination of several signal.RSU parameter preset comprises: transmitting power, radiation direction and half-power angle.
Step S3: described caliberating device carries out field strength measurement according to the distribution pointwise of measurement point, and measurement result is sent to measuring terminals.Wherein, the measurement result of point-to-point measurement comprises: measurement point numbering, measurement point coordinate and signal strength signal intensity.Wherein when measuring, the move mode of caliberating device comprises the following two kinds:
Autonomous mode: caliberating device plan in advance according to measuring terminals measuring route (can in step sl measuring terminals according to select measurement point planning survey path) initiatively complete measuring position adjustment and confirmation.Wherein, measurement path planning principle is: shortest path or central area preferentially, are namely covered selected measurement point with the shortest path or first measure the measurement point being positioned at central area in calibration point region.
Passive move mode: measuring terminals obtains the position of described caliberating device by location, and moved by order control caliberating device.
Autonomous mode has been shown in Fig. 5, starting point caliberating device being positioned over measuring route starts to measure, and measures a calibration point field intensity, and determines whether the terminal in the path of planning, if not move to next calibration point, until terminal according to the wire diameter automatic on planning road.
For passive move mode, concrete steps comprise: measuring terminals generates movement instruction according to the current measurement point position of caliberating device and next measurement point position; Caliberating device moves to next measurement point according to movement instruction, and sends motion state Frame to measuring terminals; Measuring terminals receives motion state Frame and upgrades the current location of caliberating device, judges whether to reach next measurement point, continues the current location upgrading caliberating device, until reach next measurement point if do not reach.
Step S4: measuring terminals processes measurement data, forms complete field intensity map according to measurement point position and in the radio-frequency (RF) signal strength that this measurement point is measured; On the basis of field intensity map, filter out the field strength distribution region of field intensity size higher than communication standard, obtain communication zone areal map.After obtaining field intensity map, field intensity size is exactly communication zone higher than the place of communication standard.The distribution map of field intensity may be 0 to 10, but communication zone figure only may get 4 to 10; Powerfully on the spot could to communicate in certain value.
Step S5: if the communication zone areal map obtained does not reach use standard, deviation is greater than described permissible variation, then readjust RSU parameter preset according to deviation size, repeat step S2 ~ S4 again, until measure the communication zone areal map drawn to reach use standard, deviation is less than described permissible variation.Adjustment RSU parameter preset comprises and adjusting the one in transmitting power, radiation direction and half-power angle or combination in any.
If when the antenna of tested roadside device possesses multiple configurable communication region, then by step S1 ~ S5 each communication zone measured one by one and demarcate.
Demarcate for the RSU field strength measurement and communication zone that possess signal framing, also comprise: RSU is to the search of caliberating device and locate first between step S1 and S2, concrete search and locate mode belong to existing method, repeat no more herein.
Use ETC track provided by the invention RSU device signal field strength measurement and communication zone caliberating device, system and method also there is following beneficial effect:
1) realize RSU signal measurement and region labeling automation, alleviate ETC track engineering construction labour intensity;
2) signal intensity profile characteristic in RSU communication zone boundaries information and region can be obtained simultaneously;
3) adopt quantitative measurment, data are accurate;
4) different RSU device type can be used.
Visible, ETC track provided by the invention RSU device signal field strength measurement and communication zone caliberating device, system and method achieve the automation of correlated process operation, test accurately, easy to operate, the scope of application is wide, greatly can reduce ETC engineering RSU track implementation and operation difficulty and working strength, be conducive to ETC application.
Above execution mode is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (15)
1. an ETC roadside device field strength measurement and communication zone caliberating device, it is characterized in that, comprise: radiofrequency signal measurement module, Survey control module, autonomous locating module and motion-control module, described radiofrequency signal measurement module, autonomous locating module are all connected described Survey control module with motion-control module;
Described autonomous locating module is used for current location to be sent to described Survey control module; Described Survey control module communicates with described roadside device for controlling radiofrequency signal measurement module, to measure radiofrequency signal that roadside device the sends signal strength signal intensity at current measurement point, and control described motion-control module and drive described caliberating device automatically to move to next measurement point.
2. ETC roadside device field strength measurement as claimed in claim 1 and communication zone caliberating device, it is characterized in that, described radiofrequency signal measurement module comprises: testing standard antenna, measuring unit and communication unit, be connected by RF connection between described testing standard antenna and measuring unit, the radiofrequency signal that described testing standard antenna sends for receiving roadside device, is transferred to described measuring unit by RF connection; The radiofrequency signal transmitted is converted to digital signal by described measuring unit carries out measuring and measurement result being transferred to communication unit; Described communication unit receives the control command of Survey control module test result to be transferred out.
3. ETC roadside device field strength measurement as claimed in claim 2 and communication zone caliberating device, is characterized in that, described testing standard Antenna Operation is in the 5.8GHz frequency range meeting Chinese ETC national Specification and possess constant gain.
4. ETC roadside device field strength measurement as claimed in claim 1 and communication zone caliberating device, it is characterized in that, described autonomous locating module comprises: satellite positioning module and inertial navigation module, described satellite positioning module connects inertial navigation module, satellite positioning module for obtaining described caliberating device current location, the relative position change of inertial navigation module for obtaining described caliberating device displacement and causing; Described satellite positioning module connects Survey control module, for described current location is sent to Survey control module.
5. ETC roadside device field strength measurement as claimed in claim 1 and communication zone caliberating device, it is characterized in that, described motion-control module comprises: decision-making module and Executive Module, described decision-making module connects Survey control module, receive the measuring route that Survey control module sends, and control Executive Module described caliberating device is moved by measuring route; Or receive the movement instruction of Survey control module transmission, and according to movement instruction control Executive Module, described caliberating device is moved.
6. an ETC roadside device field strength measurement and communication zone calibration system, it is characterized in that, comprise: measuring terminals and the caliberating device according to any one of Claims 1 to 5, described measuring terminals sends RSU parameter preset to described roadside device, to configure described roadside device, and control described caliberating device and measure at the measurement point preset the radio-frequency (RF) signal strength that described roadside device sends; The radio-frequency (RF) signal strength that described measuring terminals obtains measurement point position and measures at this measurement point, to form communication zone areal map and field intensity map; If the communication zone areal map obtained has reached use standard-required, in the deviation range allowed, then complete demarcation, otherwise again measured, until reach use standard-required according to deviation size adjustment RSU parameter preset.
7. ETC roadside device field strength measurement as claimed in claim 6 and communication zone calibration system, it is characterized in that, described measuring terminals connects described roadside device, described measuring terminals forwards described measuring route to described caliberating device by described roadside device, moves to next measurement point to make described caliberating device by described measuring route from a measurement point; Or forward mobile control command to described caliberating device, control described caliberating device and move to next measurement point from a measurement point.
8. ETC roadside device field strength measurement as claimed in claim 6 and communication zone calibration system, it is characterized in that, described measuring terminals connects described caliberating device, and described measuring terminals forwards described RSU parameter preset to described roadside device by described caliberating device.
9., based on a scaling method for the ETC roadside device field strength measurement according to any one of claim 6 ~ 8 and communication zone calibration system, it is characterized in that, comprising:
S1: field strength measurement parameter and RSU parameter preset are set by measuring terminals, described field strength measurement parameter comprises: zone boundary to be measured, field strength measurement point distribution density, certainty of measurement requirement, communication zone field-strength standard, communication zone spotting scope and permissible variation, and described measuring terminals is according to field strength measurement Selecting parameter measurement point;
S2: tested roadside device is with the radiofrequency signal of described RSU parameter preset transmission test;
S3: measurement result according to the distribution point-to-point measurement radio-frequency (RF) signal strength of measurement point, and is sent to described measuring terminals by described caliberating device;
S4: measuring terminals processes measurement data, forms complete field intensity map according to measurement point position and in the radio-frequency (RF) signal strength that this measurement point described is measured; On the basis of field intensity map, filter out the field strength distribution region of field intensity size higher than communication standard, obtain communication zone areal map;
S5: if the communication zone areal map obtained does not reach use standard, deviation is greater than described permissible variation, then readjust RSU parameter preset according to deviation size, then repeats step S2 ~ S4, until measure the communication zone areal map drawn to reach use standard, deviation is less than described permissible variation.
10. ETC roadside device field strength measurement as claimed in claim 9 and communication zone scaling method, it is characterized in that, the radiofrequency signal of the test described in step S2 is: a kind of signal in carrier signal, full 0 test signal, complete 1 test signal, 14kHz wake-up signal, DSRC data frame signal or the combination of several signal.
11. ETC roadside device field strength measurement as claimed in claim 9 and communication zone scaling methods, it is characterized in that, described in step S3, measurement result comprises: measurement point numbering, measurement point coordinate and signal strength signal intensity.
12. ETC roadside device field strength measurement as claimed in claim 9 and communication zone scaling methods, it is characterized in that, in step S3, the move mode that described caliberating device measures radio-frequency (RF) signal strength according to the distribution point-to-point measurement radio-frequency (RF) signal strength of measurement point comprises one of the following two kinds:
Autonomous mode: caliberating device initiatively completes measuring position adjustment according to the measuring route that described measuring terminals is planned in advance and confirms;
Passive move mode: measuring terminals obtains the position of described caliberating device by location, and moved by order control caliberating device.
13. ETC roadside device field strength measurement as claimed in claim 12 and communication zone scaling methods, it is characterized in that, described measurement path planning principle is: shortest path or central area preferential.
14. ETC roadside device field strength measurement as claimed in claim 9 and communication zone calibration systems, it is characterized in that, the RSU parameter preset described in step S5 adjusts, and comprising: the one in transmitting power, radiation direction and half-power angle or combination in any.
15. ETC roadside device field strength measurement as claimed in claim 9 and communication zone calibration systems, is characterized in that, if when the antenna of tested roadside device possesses multiple configurable communication region, to measure one by one and demarcate by step S1 ~ S5 to each communication zone.
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