CN113259028A - Method and device for capturing multistage ETC wireless radio frequency data - Google Patents
Method and device for capturing multistage ETC wireless radio frequency data Download PDFInfo
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- CN113259028A CN113259028A CN202110335073.6A CN202110335073A CN113259028A CN 113259028 A CN113259028 A CN 113259028A CN 202110335073 A CN202110335073 A CN 202110335073A CN 113259028 A CN113259028 A CN 113259028A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B15/00—Arrangements or apparatus for collecting fares, tolls or entrance fees at one or more control points
- G07B15/06—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems
- G07B15/063—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems using wireless information transmission between the vehicle and a fixed station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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Abstract
The invention discloses a method for capturing multistage ETC wireless radio frequency data, which comprises the following steps: synchronizing the time of a plurality of collectors; the method comprises the following steps that a plurality of collectors respectively capture ETC wireless radio frequency signals in the coverage areas of the collectors; demodulating the ETC radio frequency signal to obtain baseband data and RSSI data; selecting effective data in the baseband data according to an interaction protocol and a data verification rule; and obtaining a power value of the RSSI data by an averaging method, and correcting the power value by a fitting method and a mean square value to obtain final power data corresponding to the RSSI data. The problem that a radio frequency data grabbing device in the prior art can only work independently and has a small monitoring area is solved; and the problem that the receiving capability is insufficient and weak radio frequency signals are often missed.
Description
Technical Field
The application relates to the field of signal processing, in particular to a method for capturing multistage ETC wireless radio frequency data, and simultaneously relates to a device for capturing the multistage ETC wireless radio frequency data.
Background
Along with the use of ETC charging system in whole highway toll network, ETC charging system becomes the core means of highway charging, plays decisive action to the charging work, and in practical application, the operating condition and the stability of ETC roadside device are the key of entire system steady operation, consequently need carry out the condition monitoring to ETC roadside device, and the core is that ETC radio frequency signal snatchs and signal parameter's measurement. For grabbing ETC wireless radio frequency signals, firstly, debugging equipment used by developers is used for obtaining field wireless radio frequency transaction data for finding problems, the internal components are shown in figure 5, an antenna 1 and an antenna 2 receive radio frequency signals and then respectively transmit the radio frequency signals to uplink decoding and downlink decoding, and the decoded data are integrated by a processor and then output through an interface.
In the prior art, although ETC wireless radio frequency signals can be captured, the following serious defects exist:
the first can only work independently and the monitoring area is small;
the second data processing capability is insufficient and often misses the weaker radio frequency signal.
Disclosure of Invention
In order to solve the above problem, the present application provides a multistage ETC wireless radio frequency data capturing method, including:
synchronizing the time of a plurality of collectors;
the method comprises the following steps that a plurality of collectors respectively capture ETC wireless radio frequency signals in the coverage areas of the collectors;
demodulating the ETC radio frequency signal to obtain baseband data and RSSI data;
obtaining effective data in the baseband data according to the interaction protocol and the data verification rule; and obtaining a power value of the RSSI data by an averaging method, and correcting the power value by a fitting method and a mean square value to obtain final power data corresponding to the RSSI data.
Preferably, before the step of demodulating the ETC radio frequency signal, the method further includes:
and filtering and amplifying the radio frequency signal.
Preferably, the final power data corresponding to the RSSI data is obtained for evaluating the strength of the ETC radio frequency signal.
Preferably, the method further comprises the following steps:
and storing the effective data in the baseband data and the final power data corresponding to the RSSI data.
This application provides a multistage ETC radio frequency data's grabbing device simultaneously, includes:
the time synchronization unit is used for synchronizing the time of the plurality of collectors;
the signal capturing unit is used for respectively capturing ETC wireless radio frequency signals in the coverage area of each collector;
the signal demodulation unit is used for demodulating the ETC wireless radio frequency signal and acquiring baseband data and RSSI data;
the effective data and power data acquisition unit is used for acquiring effective data in the baseband data according to an interaction protocol and a data verification rule; and obtaining a power value of the RSSI data by an averaging method, and correcting the power value by a fitting method and a mean square value to obtain final power data corresponding to the RSSI data.
Preferably, the method further comprises the following steps:
and the filtering and amplifying processing subunit is used for filtering and amplifying the radio-frequency signal.
Preferably, the method further comprises the following steps:
and the storage unit is used for storing the effective data in the baseband data and the final power data corresponding to the RSSI data.
Through the method and the device for capturing the ETC wireless radio frequency data, the receiving sensitivity of a single collector is improved, the coordinated work of a plurality of collectors can be realized, and through collecting ETC wireless signals in a large area, more abundant data are provided for judging whether ETC roadside equipment works normally. The problem that the prior art only can work independently and the monitoring area is small is solved; and the problem that the weak radio frequency signal is frequently missed due to insufficient data receiving capability.
Drawings
Fig. 1 is a schematic flow chart of a multistage ETC wireless radio frequency data capture method provided in the present application;
fig. 2 is a schematic structural diagram of a multi-stage ETC wireless radio frequency data capture device provided in the present application;
fig. 3 is a schematic structural diagram of a multi-stage ETC wireless radio frequency data capture system provided in the present application;
fig. 4 is a schematic structural diagram of a multi-stage ETC wireless radio frequency data capture system provided in the present application;
FIG. 5 is a schematic diagram of a prior art harvester to which the present application relates;
FIG. 6 is a schematic diagram of an internal structure of a collector provided by the present application;
fig. 7 is a schematic workflow diagram of a multistage ETC wireless radio frequency data capture method according to the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
The application provides a multistage ETC wireless radio frequency data capturing method, and a flow schematic diagram of the method is shown in figure 1. The method comprises the following steps:
step S101, the coordination controller synchronizes the time of a plurality of collectors.
The coordination controller can be used for calibrating the time of a plurality of connected collectors when the coordination controller is started or is used for synchronizing the time of the collectors when the time of any collector is inconsistent with the time of the coordination controller. And all collectors keep consistent time when capturing data.
Step S102, a plurality of collectors respectively capture ETC wireless radio frequency signals in the coverage areas of the collectors.
The regional scope that the collector can cover is limited, so, in order to can snatch all signals in the ETC transaction region, improve the wireless radio frequency signal of ETC, can set up the quantity of collector and the distance between the collector as required and the regional scope that each collector can cover. Then, each collector respectively captures ETC wireless radio frequency signals in the coverage area of each collector.
And S103, demodulating the ETC radio frequency signal, and acquiring baseband data and RSSI data.
The collector filters and amplifies the captured data, and improves the signal receiving sensitivity so as to avoid the leakage of weak radio frequency signals. The amplified signal is demodulated, after which there are two signals, one baseband data (FMO) and one RSSI data.
Step S104, selecting effective data in the baseband data according to an interaction protocol and a data verification rule; and obtaining a power value of the RSSI data by an averaging method, and correcting the power value by a fitting method and a mean square value to obtain final power data corresponding to the RSSI data.
And deleting the invalid data after selecting the valid data in the baseband data according to the interaction protocol and the data verification rule. And final power data corresponding to the RSSI data is used for evaluating the strength of the ETC radio frequency signal. And finally, storing the effective data in the baseband data and the final power data corresponding to the RSSI data by a coordination controller.
The working flow of the multistage ETC wireless radio frequency data capturing method is shown in fig. 7. FMO decoding in fig. 6 refers to decoding a baseband signal.
Based on the same inventive concept, the present application also provides a device 200 for capturing multi-level ETC wireless radio frequency data, as shown in fig. 2, including:
a time synchronization unit 210 for synchronizing the times of the plurality of collectors;
the signal capturing unit 220 is used for capturing the ETC wireless radio frequency signals in the coverage areas of the plurality of collectors respectively;
the signal demodulation unit 230 demodulates the ETC radio frequency signal to acquire baseband data and RSSI data;
an effective data and power data obtaining unit 240, configured to obtain effective data in baseband data according to an interaction protocol and a data verification rule; and obtaining a power value of the RSSI data by an averaging method, and correcting the power value by a fitting method and a mean square value to obtain final power data corresponding to the RSSI data.
Preferably, the method further comprises the following steps:
and the filtering and amplifying processing subunit is used for filtering and amplifying the radio-frequency signal.
Preferably, the method further comprises the following steps:
and the storage unit is used for storing the effective data in the baseband data and the final power data corresponding to the RSSI data.
The specific application examples are as follows:
a multi-stage ETC wireless radio frequency data grabbing system is composed of a plurality of collectors and a coordination controller, and the structure of the system is shown in figures 3 and 4. The plurality of collectors are respectively connected with the coordination controller or connected with the coordination controller after being cascaded and used for collecting the data of the ETC wireless radio frequency signals in the covered area; the coordination controller is used for coordinating and controlling the operation of the plurality of collectors and controlling the plurality of collectors to keep time synchronization; and collecting the data of the ETC wireless radio frequency signals acquired by a plurality of collectors.
The connection modes of the plurality of collectors and the coordination controller are divided into 2 types, wherein the first connection mode is a plurality of collectors respectively connected with the coordination controller, as shown in fig. 3. The second connection mode is that a plurality of collectors are connected with the coordination controller after being cascaded, as shown in fig. 4.
The first connection mode shown in fig. 3 includes a collector 1(201), a collector 2(202), a collector 3(20) … …, a collector n (20n), and a coordination controller (100), wherein when the plurality of collectors are connected to the coordination controller, the plurality of collectors respectively send the collected data of the ETC radio frequency signals in the covered area to the coordination controller.
In the second connection mode shown in fig. 4, the coordination controller (100) includes a collector 1(201), a collector 2(202), a collector 3(20) … … collector N (20N), and when a plurality of collectors are connected to the coordination controller after being cascaded, the most remote N-level collector is cascaded to send the collected data of the ETC wireless radio frequency signals in the covered area to the N-1-level collector connected to the collector, and the N-1-level collector sends the data of the ETC wireless radio frequency signals in the covered area collected by the N-level collector and the N-1-level collector to the N-2-level collector until the collector connected to the coordination controller receives the data of the ETC wireless radio frequency signals in the covered area collected by all the collectors and then sends the data to the coordination controller.
The coordination controller is used for coordinating and controlling the plurality of collectors to keep the same detection running state or the sleep running state; and when the plurality of collectors are in the running state, keeping the plurality of collectors in time synchronization. When the coordination controller is upgrading, the state of the coordination controller is an upgrading adjustment state.
When each collector collects the data of the ETC wireless radio frequency signals in the covered area, each data is provided with a collection time stamp.
When the grabbing system of multistage ETC radio frequency data is in a working mode, the system is unified and calibrated, each collector takes the time of the coordination controller as the standard, each collector works respectively to collect ETC radio signals in the coverage area of the collector, all collected data are provided with time stamps, then the collected data are transmitted to the coordination controller or a previous-stage collector, and finally the coordination controller is collected, so that the data collection of the ETC radio signals in the whole area is realized.
The internal structure of the collector is shown in fig. 6, and comprises an uplink antenna (500), a downlink antenna (500), an uplink radio frequency processing module (400), a downlink radio frequency processing module (300), an uplink demodulation module (300), a processor (200), and an uplink interface (100). The uplink antenna is connected with the uplink radio frequency processing module; the uplink radio frequency processing module is connected with the uplink demodulation module; the uplink demodulation module is connected with the processor; the downlink antenna is connected with the downlink radio frequency processing module; the downlink radio frequency processing module is connected with the downlink demodulation module; the downlink demodulation module is connected with the processor; the uplink demodulation module and the downlink demodulation module are connected with the processor; the processor is respectively connected with the uplink interface and the downlink interface.
The uplink and downlink antennas are used for receiving uplink and downlink radio frequency signals in the ETC transaction process;
the uplink antenna is used for receiving uplink radio frequency signals in the ETC transaction process; sending the received uplink radio frequency signal to an uplink radio frequency processing module;
the downlink antenna is used for receiving downlink radio frequency signals in the ETC transaction process; sending the received downlink radio frequency signal to a downlink radio frequency processing module;
the uplink radio frequency processing module is used for receiving an uplink radio frequency signal sent by an uplink antenna, filtering and amplifying the radio frequency signal and sending the processed data to the uplink demodulation module;
the downlink radio frequency processing module is used for receiving downlink radio frequency signals sent by a downlink antenna, filtering and amplifying the radio frequency signals and sending processed data to the downlink demodulation module;
the uplink demodulation module is used for receiving the data sent by the uplink radio frequency processing module, demodulating the data to obtain baseband data and RSSI data, and decoding the baseband data obtained by demodulation; sending the demodulated and decoded data to a processor;
the downlink demodulation module is used for receiving the data sent by the downlink radio frequency processing module, demodulating the data to obtain baseband data and RSSI data, and decoding the baseband data obtained by demodulation; sending the demodulated and decoded data to a processor;
the processor is used for receiving the data sent by the uplink demodulation module and the downlink demodulation module and obtaining decoded data and power data corresponding to baseband data and RSSI data through integration processing on the data; sending the decoded data and the power data to an uplink interface and a downlink interface; the processor selects effective data in the baseband data according to an interaction protocol and a data verification rule for the baseband data sent by the uplink demodulation module and the downlink demodulation module; the processor obtains a power value for RSSI data sent by the uplink demodulation module and the downlink demodulation module through an averaging method, and then corrects the power value through a fitting method and a mean square value to obtain final power data corresponding to the RSSI data. The functions of the processor, further comprising: controlling the working mode of the gripping device and controlling the radio frequency signal.
The uplink interface is used for outputting the processed uplink radio frequency data and cascading with the multiple devices;
and the downlink interface is used for outputting the processed downlink radio frequency data and cascading with the multiple devices.
And the plurality of collectors are connected with the downlink interface through the uplink interface or connected with the coordination controller.
The working process of the collector is that the processor receives an upper computer instruction through a receiving interface (an uplink interface or a downlink interface) to control the whole working mode; in a data capturing working mode, after receiving ETC wireless radio frequency signals, the uplink and downlink antennas transmit the ETC wireless radio frequency signals to uplink/downlink radio frequency processing for signal filtering and amplification, so that the receiving sensitivity is improved; the amplified radio frequency signal is transmitted to an uplink/downlink demodulation module for demodulation, two signals are obtained after demodulation, namely decoded data and RSSI (received signal strength indicator) signals, wherein the decoded data are data, and the processor selects effective data according to a protocol and data verification. The RSSI data is subjected to an averaging method to obtain a power value preliminarily, then the power data in the transaction process is corrected through a fitting method and an averaging method to obtain a final signal power value, and the signal strength is evaluated. The processor integrates the received decoded data and the radio frequency power signal, attaches a time stamp and outputs the time stamp to the coordination controller through the interface.
Through the method and the device for capturing the ETC wireless radio frequency data, the receiving sensitivity of a single collector is improved, the coordinated work of a plurality of collectors can be realized, and through collecting ETC wireless signals in a large area, more abundant data are provided for judging whether ETC roadside equipment works normally. The problem that the prior art only can work independently and the monitoring area is small is solved; and the problem that the weak radio frequency signal is frequently missed due to insufficient data receiving capability.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention.
Claims (7)
1. The method for capturing the multistage ETC wireless radio frequency data is characterized by comprising the following steps:
synchronizing the time of a plurality of collectors;
the method comprises the following steps that a plurality of collectors respectively capture ETC wireless radio frequency signals in the coverage areas of the collectors;
demodulating the ETC radio frequency signal to obtain baseband data and RSSI data;
obtaining effective data in the baseband data according to the interaction protocol and the data verification rule; and obtaining a power value of the RSSI data by an averaging method, and correcting the power value by a fitting method and a mean square value to obtain final power data corresponding to the RSSI data.
2. The data capture method according to claim 1, further comprising, prior to the step of demodulating the ETC radio frequency signal:
and filtering and amplifying the radio frequency signal.
3. The data capture method according to claim 1, wherein final power data corresponding to the RSSI data is obtained for evaluating the strength of the ETC radio frequency signal.
4. The data crawling method according to claim 1, further comprising:
and storing the effective data in the baseband data and the final power data corresponding to the RSSI data.
5. The utility model provides a multistage ETC radio frequency data's grabbing device which characterized in that includes:
the time synchronization unit is used for synchronizing the time of the plurality of collectors;
the signal capturing unit is used for respectively capturing ETC wireless radio frequency signals in the coverage area of each collector;
the signal demodulation unit is used for demodulating the ETC wireless radio frequency signal and acquiring baseband data and RSSI data;
the effective data and power data acquisition unit is used for acquiring effective data in the baseband data according to an interaction protocol and a data verification rule; and obtaining a power value of the RSSI data by an averaging method, and correcting the power value by a fitting method and a mean square value to obtain final power data corresponding to the RSSI data.
6. The grasping apparatus according to claim 5, further comprising:
and the filtering and amplifying processing subunit is used for filtering and amplifying the radio-frequency signal.
7. The grasping apparatus according to claim 5, further comprising:
and the storage unit is used for storing the effective data in the baseband data and the final power data corresponding to the RSSI data.
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| CN202110335073.6A CN113259028A (en) | 2021-03-29 | 2021-03-29 | Method and device for capturing multistage ETC wireless radio frequency data |
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| CN202110335073.6A CN113259028A (en) | 2021-03-29 | 2021-03-29 | Method and device for capturing multistage ETC wireless radio frequency data |
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| WO2009139288A1 (en) * | 2008-05-16 | 2009-11-19 | 三菱電機株式会社 | Communication device |
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2021
- 2021-03-29 CN CN202110335073.6A patent/CN113259028A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487567A (en) * | 2008-01-18 | 2009-07-22 | 北京世纪华扬能源科技有限公司 | Acoustic wave leakage detecting and positioning device |
| WO2009139288A1 (en) * | 2008-05-16 | 2009-11-19 | 三菱電機株式会社 | Communication device |
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Application publication date: 20210813 |