CN214412713U - ETC signal processing device - Google Patents
ETC signal processing device Download PDFInfo
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- CN214412713U CN214412713U CN202120585249.9U CN202120585249U CN214412713U CN 214412713 U CN214412713 U CN 214412713U CN 202120585249 U CN202120585249 U CN 202120585249U CN 214412713 U CN214412713 U CN 214412713U
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Abstract
The utility model discloses a ETC signal processing device relates to high-speed power ETC technical field. The device comprises: the antenna comprises a first receiving antenna module, a first band-pass filter, a first low-noise amplifier and a first ETC radio frequency transceiver, wherein the first receiving antenna module is connected with the signal input end of the first band-pass filter, the signal output end of the first band-pass filter is connected with the signal input end of the first low-noise amplifier, and the signal output end of the first low-noise amplifier is connected with the signal input end of the first ETC radio frequency transceiver. The device can solve the near-frequency interference problem in the application of the ETC system, and further improve the one-time transaction success rate of the ETC system.
Description
Technical Field
The utility model relates to a high-speed power ETC technical field especially relates to an ETC signal processing device that can improve ETC one-time transaction success rate.
Background
An Electronic Toll Collection (ETC) system adopts a special Short Range Communication (DSRC) technology to realize wireless data Communication between a vehicle and a Toll station, performs vehicle automatic induction identification and related Toll data exchange, adopts a computer network to process Toll data, realizes no-parking and no-Toll window and can also realize a full-automatic electronic Toll Collection system.
The ETC system mainly comprises a vehicle automatic identification system, a central management system, other auxiliary facilities and the like. The automatic vehicle identification system includes a vehicle-mounted unit, also called a transponder or an electronic tag, a Road Side Unit (RSU), a loop sensor, and the like. The OBU stores identification information of the vehicle and is typically mounted on the windshield in front of the vehicle, the RSU is mounted near the toll station, and the loop sensor is mounted under the ground of the roadway. The central management system has a large database storing information on a large number of registered vehicles and users. When the vehicle passes through the toll station port, the loop sensor senses the vehicle, the RSU sends out an inquiry signal, the OBU responds and performs two-way communication and data exchange, the central management system obtains vehicle identification information, such as information of an automobile ID number, an automobile type and the like, and corresponding information in the database are compared and judged, the management system is controlled to generate different actions according to different conditions, for example, the computer toll management system deducts a road toll which should be paid at this time from a prepaid account of the vehicle, or sends an instruction to other auxiliary facilities, and the transaction process is completed.
The transaction reliability requirement of the ETC lane system in the No. 13 bulletin technical requirement of toll road networking electronic toll collection in the transportation department 2011: the legal ETC vehicle passes through the ETC lane at the speed of 20Km/h under the condition that the vehicle-mounted equipment of the legal ETC vehicle works normally, and the transaction success rate is not lower than 99.7 percent. The importance and the criticality of the performance of the Road Side Units (RSUs) in ensuring the transaction reliability index of the ETC system are self-evident. The current phased array antenna technology of the wave beam shaping following technology, the MIMO technology and the software radio technology basically solves the problem of unsuccessful transaction caused by adjacent channel interference, vehicle following interference, signal multipath and too fast vehicle speed; the preposed low device sound amplification technology solves the problem of unsuccessful transaction caused by low received signal power; or RSU signal receiving and transmitting separation is adopted, so that the interaction efficiency is improved, and the transaction success rate is further improved. Despite the adoption of various technical measures, the average value of the success rate of one transaction of the ETC system is 98%, and a gap exists between the success rate and the requirement of bulletin.
The problem of unsuccessful transactions due to near-frequent interference is not addressed and measures are taken in the ETC system. The near-frequency interference is interference generated by non-channel frequency signals (non-malicious signals), the ETC system is in a relatively complex electromagnetic environment, near the application frequency of the ETC system in China, a plurality of frequency bands are in use or are about to be started to use, such as 5GHz Wifi and China Mobile 5G n79 frequency bands, and various frequency signals are converged in the air, the frequency components can generate mixing signals under certain conditions, for example, two or more people can simultaneously use the 4G communication system to talk, and under specific conditions, the mixing signals of 5.1GHz can be generated, and the signals are the near-frequency signals of the ETC system.
In the application of the prior art, the RSU receiving system has two combination modes, one is a receiving and transmitting integrated antenna structure, and the combination modes are sequentially a receiving and transmitting integrated antenna array unit, a radio frequency switch, a low noise amplifier and an ETC radio frequency transceiver; the other is a receiving-transmitting separated antenna structure which is composed of a receiving antenna array unit, a low noise amplifier and an ETC radio frequency transceiver in sequence. Under normal conditions, in the two application schemes, the radio-frequency signals received by the receiving antenna pass through a channel established by the radio-frequency switch or directly enter the low-noise amplifier, after linear amplification, demodulation and decoding are carried out by the ETC radio-frequency transceiver, and AD conversion is realized. However, the ETC antenna has a certain gain bandwidth, has a maximum gain in an application frequency band, also has a certain gain in a frequency band range near an application frequency, can bring near-frequency signals into an ETC receiving link, and the signals raise the static working point of a low-noise amplifier, so that the dynamic working range of the amplifier is reduced, the linearity is deteriorated, the bottom noise level of a system is raised, the error rate of the system is increased, and particularly when the power of the near-frequency signals reaches a certain degree, the low-noise amplifier can be saturated, jammed and completely interrupted in communication.
The unsuccessful transaction problem of the ETC system caused by the above phenomenon is randomly generated under specific conditions, and has uncontrollable property, discontinuity and repeatability, for example, a communication base station or a wireless hotspot is built near the RSU, and when people use the mobile communication system to communicate under specific position and specific time, a near-frequency interference problem to the ETC system can be generated, thereby causing unsuccessful transaction.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem how to provide a near-frequency interference problem in can solving the ETC system and use, and then improve the ETC signal processing device of ETC system one-time transaction success rate.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: an ETC signal processing device characterized by comprising: the antenna comprises a first receiving antenna module, a first band-pass filter, a first low-noise amplifier and a first ETC radio frequency transceiver, wherein the first receiving antenna module is connected with the signal input end of the first band-pass filter, the signal output end of the first band-pass filter is connected with the signal input end of the first low-noise amplifier, and the signal output end of the first low-noise amplifier is connected with the signal input end of the first ETC radio frequency transceiver.
The utility model also discloses a ETC signal processing apparatus, its characterized in that includes: receiving and dispatching integrative antenna, radio frequency switch, second band pass filter, second low noise amplifier, second ETC radio frequency transceiver and power amplifier, receiving and dispatching integrative antenna with radio frequency switch's common port is connected, radio frequency switch's a tap-off terminal with second band pass filter's signal input part is connected, second band pass filter's signal output part and second low noise amplifier's signal input part are connected, second low noise amplifier's signal output part with second ETC radio frequency transceiver's signal input part is connected, radio frequency switch's another tap-off terminal with power amplifier's signal output part is connected.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the device adopts the preposed low-insertion-loss steep out-of-band rejection band-pass filtering, reduces the system noise introduced by additional loss to the maximum extent, and simultaneously attenuates the stray power of signals outside the working frequency band entering the low-noise amplifier to prevent the overload of the first-stage low-noise amplifier of the receiving system, eliminates the condition of increasing the background noise of a link due to nonlinearity, and equivalently improves the out-of-band P1dB of the amplifying link of the receiving system to a great extent. The front-mounted low-insertion-loss steep out-of-band rejection band-pass filtering protects the dynamic range of the whole ETC receiving system from being deteriorated due to near-frequency interference, so that the ETC system can normally work under strong interference signals, and the one-time transaction success rate of the ETC system is improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic block diagram of the device according to the embodiment of the present invention in the case of the separation of the transmitting and receiving antennas;
fig. 2 is a schematic block diagram of the device according to the embodiment of the present invention, in which the transceiver antenna is integrated;
wherein: 1-1, a first receiving antenna module; 1-2, a first band-pass filter; 1-3, a first low noise amplifier; 1-4, a first ETC radio frequency transceiver; 2-1, a transmitting-receiving integrated antenna; 2-2, a radio frequency switch; 2-3, a second band-pass filter; 2-4, a second low noise amplifier; 2-5, a second ETC radio frequency transceiver; 2-6, power amplifier.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, the utility model discloses an ETC signal processing device, the device uses split type antenna structure, include: the antenna comprises a first receiving antenna module 1-1, a first band-pass filter 1-2, a first low noise amplifier 1-3 and a first ETC radio frequency transceiver 1-4. The first receiving antenna module 1-1 is connected to a signal input end of the first band-pass filter 1-2, a signal output end of the first band-pass filter 1-2 is connected to a signal input end of the first low noise amplifier 1-3, and a signal output end of the first low noise amplifier 1-3 is connected to a signal input end of the first ETC radio frequency transceiver 1-4.
As shown in fig. 2, the utility model also discloses an ETC signal processing device, the device uses integral type antenna structure, include: the antenna comprises a transceiving integrated antenna 2-1, a radio frequency switch 2-2, a second band-pass filter 2-3, a second low noise amplifier 2-4, a second ETC radio frequency transceiver 2-5 and a power amplifier 2-6. Receiving and dispatching integrative antenna 2-1 with radio frequency switch 2-2's common port is connected, a tapping line terminal of radio frequency switch 2-2 with second band pass filter 2-3's signal input part is connected, second band pass filter 2-3's signal output part and second low noise amplifier 2-4's signal input part are connected, second low noise amplifier 2-4's signal output part with second ETC radio frequency transceiver 2-5's signal input part is connected, another tapping line terminal of radio frequency switch 2-2 with power amplifier 2-6's signal output part is connected.
Preferably, the band-pass filter 2-3 is a low insertion loss steep out-of-band rejection band-pass filter, the in-band insertion loss of the low insertion loss steep out-of-band rejection band-pass filter is not more than 2dB, and the filter type is BAW, FBAR or ceramic medium.
The band-pass filter with the low insertion loss and the high out-of-band steep roll-off suppression degree is adopted, and the band-pass filter with the low insertion loss and the steep out-of-band suppression degree is arranged in an ETC receiving link and is used for band-pass filtering after a receiving antenna and before low-noise amplification. The ETC antenna receives frequency component signals which are transmitted to the preposed band-pass filter, the preposed band-pass filter has small in-band insertion loss, working signals in an application frequency band pass through the preposed band-pass filter in a low-loss way, then the working signals are fed into a low-noise amplifier, and the working signals are transmitted to the ETC radio frequency transceiver for application after low-noise linear amplification; the preposed band-pass filter has high out-of-band resistance and high loss, most signals in out-of-band stray signals are reflected by the filter, and a small number of signals enter the low-noise amplifier after being highly attenuated by the band-pass filter.
The device adopts the preposed low-insertion-loss steep out-of-band rejection band-pass filtering, reduces the system noise introduced by additional loss to the maximum extent, and simultaneously attenuates the stray power of signals outside the working frequency band entering the low-noise amplifier to prevent the overload of the first-stage low-noise amplifier of the receiving system, eliminates the condition of increasing the background noise of a link due to nonlinearity, and equivalently improves the out-of-band P1dB of the amplifying link of the receiving system to a great extent. The front-mounted low-insertion-loss steep out-of-band rejection band-pass filtering protects the dynamic range of the whole ETC receiving system from being deteriorated due to near-frequency interference, so that the ETC system can normally work under strong interference signals, and the one-time transaction success rate of the ETC system is improved.
Claims (6)
1. An ETC signal processing device characterized by comprising: the antenna comprises a first receiving antenna module (1-1), a first band-pass filter (1-2), a first low-noise amplifier (1-3) and a first ETC radio frequency transceiver (1-4), wherein the first receiving antenna module (1-1) is connected with a signal input end of the first band-pass filter (1-2), a signal output end of the first band-pass filter (1-2) is connected with a signal input end of the first low-noise amplifier (1-3), and a signal output end of the first low-noise amplifier (1-3) is connected with a signal input end of the first ETC radio frequency transceiver (1-4).
2. The ETC signal processing device according to claim 1, characterized in that: the first band-pass filter (1-2) is a low-insertion-loss steep out-of-band rejection band-pass filter.
3. The ETC signal processing device according to claim 2, characterized in that: the low-insertion-loss steep out-of-band rejection band-pass filter has an in-band insertion loss not greater than 2dB and is of a BAW, FBAR or ceramic medium type.
4. An ETC signal processing device characterized by comprising: receiving and dispatching integrative antenna (2-1), radio frequency switch (2-2), second band pass filter (2-3), second low noise amplifier (2-4), second ETC radio frequency transceiver (2-5) and power amplifier (2-6), receiving and dispatching integrative antenna (2-1) with the common terminal of radio frequency switch (2-2) is connected, a tapping line terminal of radio frequency switch (2-2) with the signal input part of second band pass filter (2-3) is connected, the signal output part of second band pass filter (2-3) is connected with the signal input part of second low noise amplifier (2-4), the signal output part of second low noise amplifier (2-4) with the signal input part of second ETC radio frequency transceiver (2-5) is connected, and the other tapping line end of the radio frequency switch (2-2) is connected with the signal output end of the power amplifier (2-6).
5. The ETC signal processing device according to claim 4, wherein: the second band-pass filter (2-3) is a low-insertion-loss steep out-of-band rejection band-pass filter.
6. The ETC signal processing device according to claim 5, wherein: the low-insertion-loss steep out-of-band rejection band-pass filter has an in-band insertion loss not greater than 2dB and is of a BAW, FBAR or ceramic medium type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120585249.9U CN214412713U (en) | 2021-03-23 | 2021-03-23 | ETC signal processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120585249.9U CN214412713U (en) | 2021-03-23 | 2021-03-23 | ETC signal processing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214412713U true CN214412713U (en) | 2021-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120585249.9U Active CN214412713U (en) | 2021-03-23 | 2021-03-23 | ETC signal processing device |
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| Country | Link |
|---|---|
| CN (1) | CN214412713U (en) |
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2021
- 2021-03-23 CN CN202120585249.9U patent/CN214412713U/en active Active
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Address after: 050000 Floor 19, Aviation Building, No. 9, Shiqing Road, Xinhua District, Shijiazhuang City, Hebei Province Patentee after: Hebei Jiaotou Intelligent Technology Co.,Ltd. Address before: 050051 No.52, Xinshi North Road, Qiaoxi District, Shijiazhuang City, Hebei Province Patentee before: HEBEI INTELLIGENT TRANSPORTATION TECHNOLOGYY CO.,LTD. OF HEBTIG |